Heat-treatable steels, alloy steels and free-cutting steels

ISO 683-3:2016 specifies the technical delivery requirements for - semi-finished products, hot formed, e.g. blooms, billets, slabs (see Note 1), - bars (see Note 1), - wire rod, - finished flat products, and - hammer or drop forgings (see Note 1) manufactured from the case-hardening non-alloy or alloy steels listed in Table 3 and supplied in one of the heat-treatment conditions given for the different types of products in Table 1 and in one of the surface conditions given in Table 2. The steels are, in general, intended for the manufacture of case-hardened (see 3.1) machine parts. NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and hammer-forged bars are covered under semi-finished products or bars and not under the term "hammer and drop forgings". NOTE 2 For International Standards relating to steels complying with the requirements for the chemical composition in Table 3, however, supplied in other product forms or treatment conditions than given above or intended for special applications, and for other related International Standards, see the Bibliography. In special cases, variations in these technical delivery requirements or additions to them can form the subject of an agreement at the time of enquiry and order (see 5.2 and Annex A). In addition to ISO 683-3:2016, the general technical delivery requirements of ISO 404 are applicable.

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage

La présente partie de l'ISO 683 spécifie les conditions techniques de livraison des: — demi-produits formés ŕ chaud, comme par exemple les blooms, billettes et brames (voir Note 1); — barres (voir Note 1); — fils machine; — produits plats finis; et — pičces forgées par martelage ou estampage (voir Note 1) fabriqués ŕ partir d'aciers alliés ou non alliés pour cémentation énumérés dans le Tableau 3 et livrés dans l'un des états de traitement thermique donnés pour les différents types de produits dans le Tableau 1 et dans l'un des états de surface donnés dans le Tableau 2. Les aciers sont en général destinés ŕ la fabrication de pičces mécaniques cémentées (voir 3.1). NOTE 1 Les produits semi-finis forgés par martelage (blooms, billettes, brames, etc.), les anneaux laminés sans soudure et les barres forgées par martelage figurent parmi les produits semi-finis ou les barres, et non sous l'appellation «pičces forgées par martelage ou estampage». NOTE 2 Pour les Normes internationales relatives aux aciers qui sont conformes aux exigences de composition chimique du Tableau 3, mais fournis sous d'autres formes de produits ou dans des états de traitement autres que ceux indiqués ci-dessus, ou qui sont destinés ŕ des applications spéciales, ainsi que pour d'autres Normes internationales analogues, voir la Bibliographie. Dans certains cas particuliers, il est possible de déroger aux présentes conditions techniques de livraison ou d'en ajouter d'autres, ŕ condition d'en convenir au moment de l'appel d'offres et de la commande (voir 5.2 et Annexe A). En plus de cette partie de l'ISO 683, les conditions générales techniques de livraison de l'ISO 404 sont applicables.

General Information

Status
Replaced
Publication Date
03-Jul-2016
Withdrawal Date
03-Jul-2016
Current Stage
6060 - International Standard published
Start Date
30-May-2016
Completion Date
04-Jul-2016
Ref Project

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INTERNATIONAL ISO
STANDARD 683-3
Second edition
2016-07-15
Heat-treatable steels, alloy steels and
free-cutting steels —
Part 3:
Case-hardening steels
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 3: Aciers pour cémentation
Reference number
ISO 683-3:2016(E)
ISO 2016
---------------------- Page: 1 ----------------------
ISO 683-3:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 683-3:2016(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Classification and designation ............................................................................................................................................................... 2

4.1 Classification ............................................................................................................................................................................................. 2

4.2 Designation ................................................................................................................................................................................................ 3

5 Information to be supplied by the purchaser......................................................................................................................... 3

5.1 Mandatory information ................................................................................................................................................................... 3

5.2 Options and/or supplementary or special requirements .................................................................................. 3

5.3 Ordering example ................................................................................................................................................................................. 3

6 Manufacturing process .................................................................................................................................................................................. 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Deoxidation ................................................................................................................................................................................................ 4

6.3 Heat-treatment condition and surface condition at delivery ......................................................................... 4

6.3.1 Normal condition at delivery ................................................................................................................................ 4

6.3.2 Particular heat-treatment condition .................. ............................................................................................. 4

6.3.3 Particular surface conditions ................................................................................................................................ 4

6.4 Traceability of the cast ..................................................................................................................................................................... 4

7 Requirements .......................................................................................................................................................................................................... 4

7.1 Chemical composition, hardness and hardenability .............................................................................................. 4

7.1.1 General...................................................................................................................................................................................... 4

7.1.2 Chemical composition ................................................................................................................................................. 5

7.2 Machinability ............................................................................................................................................................................................ 5

7.3 Cold shearability .................................................................................................................................................................................... 5

7.4 Grain size ...................................................................................................................................................................................................... 5

7.5 Non-metallic inclusions ................................................................................................................................................................... 5

7.5.1 Microscopic inclusions ............................................................................................................................................... 5

7.5.2 Macroscopic inclusions .............................................................................................................................................. 5

7.6 Internal soundness .............................................................................................................................................................................. 6

7.7 Surface condition .................................................................................................................................................................................. 6

7.8 Shape, dimensions and tolerances ......................................................................................................................................... 6

8 Inspection .................................................................................................................................................................................................................... 6

8.1 Testing procedures and types of documents ................................................................................................................ 6

8.2 Frequency of testing ........................................................................................................................................................................... 7

8.3 Tests to be carried out for specific inspection ............................................................................................................. 7

8.3.1 General...................................................................................................................................................................................... 7

8.3.2 Visual and dimensional inspection .................................................................................................................. 7

9 Test methods ............................................................................................................................................................................................................. 7

9.1 Chemical analysis .................................................................................................................................................................................. 7

9.2 Hardness and hardenability tests ........................................................................................................................................... 7

9.2.1 Verification of hardness ............................................................................................................................................. 7

9.2.2 Verification of hardenability .................................................................................................................................. 7

9.3 Retests ............................................................................................................................................................................................................ 8

10 Marking .......................................................................................................................................................................................................................... 8

Annex A (normative) Supplementary or special requirements ............................................................................................29

Annex B (informative) Designation of steels given in this part of ISO 683 and of comparable

grades covered in various designation systems................................................................................................................31

© ISO 2016 – All rights reserved iii
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ISO 683-3:2016(E)

Annex C (informative) Dimensional standards applicable to products complying with this

part of ISO 683 .....................................................................................................................................................................................................33

Annex D (informative) Classification of steel grades according to minimum tensile strength

as a function of diameter after hardening and tempering at 200 °C ...........................................................34

Bibliography .............................................................................................................................................................................................................................35

iv © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 683-3:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 4, Heat-treatable and

alloy steels.

This second edition cancels and replaces the first edition (ISO 683-3:2014), of which it constitutes a

minor revision.

ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy steels and free-

cutting steels:
— Part 1: Non-alloy steels for quenching and tempering
— Part 2: Alloy steels for quenching and tempering
— Part 3: Case-hardening steels
— Part 4: Free-cutting steels
— Part 5: Nitriding steels
— Part 14: Hot-rolled steels for quenched and tempered springs
— Part 15: Valve steels for internal combustion engines
— Part 17: Ball and roller bearing steels
— Part 18: Bright steel products
© ISO 2016 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 683-3:2016(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 3:
Case-hardening steels
1 Scope
This part of ISO 683 specifies the technical delivery requirements for
— semi-finished products, hot formed, e.g. blooms, billets, slabs (see Note 1),
— bars (see Note 1),
— wire rod,
— finished flat products, and
— hammer or drop forgings (see Note 1)

manufactured from the case-hardening non-alloy or alloy steels listed in Table 3 and supplied in one

of the heat-treatment conditions given for the different types of products in Table 1 and in one of the

surface conditions given in Table 2.

The steels are, in general, intended for the manufacture of case-hardened (see 3.1) machine parts.

NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and

hammer-forged bars are covered under semi-finished products or bars and not under the term “hammer and

drop forgings”.

NOTE 2 For International Standards relating to steels complying with the requirements for the chemical

composition in Table 3, however, supplied in other product forms or treatment conditions than given above or

intended for special applications, and for other related International Standards, see the Bibliography.

In special cases, variations in these technical delivery requirements or additions to them can form the

subject of an agreement at the time of enquiry and order (see 5.2 and Annex A).

In addition to this part of ISO 683, the general technical delivery requirements of ISO 404 are applicable.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable to its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing

ISO 404, Steel and steel products — General technical delivery requirements
ISO 642:1999, Steel — Hardenability test by end quenching (Jominy test)
ISO 643, Steels — Micrographic determination of the apparent grain size
ISO 4885, Ferrous products — Heat treatments — Vocabulary

ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based

on chemical composition
© ISO 2016 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 683-3:2016(E)

ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main

quality classes and main property or application characteristics

ISO 4967, Steel — Determination of content of non-metallic inclusions — Micrographic method using

standard diagrams
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H,

K, N, T)
ISO 6929, Steel products — Vocabulary

ISO 7788, Steel — Surface finish of hot-rolled plates and wide flats — Delivery requirements

ISO 9443, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire

rods — Technical delivery conditions
ISO 10474, Steel and steel products — Inspection documents

ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO/TS 4949, Steel names based on letter symbols
3 Terms and definitions

For the purposes of this document, the definitions of ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2,

ISO 6929, ISO 14284 and the following apply.

NOTE For deviations from these terms and definitions, see Note 1 of the Scope and footnote a of Table 2.

3.1
case-hardening steels

structural steels with a relatively low carbon content, which are carburized or carbonitrided on their

surface and subsequently hardened

Note 1 to entry: These steels, after hardening, have a high degree of hardness in the surface zone and good

resistance to wear, while the core material is characterized principally by extreme toughness.

Note 2 to entry: Further, possibilities for heat treatment of case-hardening steels are, for example, nitrocarburizing

and nitriding.
3.2
non-alloy steel
as defined in ISO 4948-1
3.3
alloy steel
as defined in ISO 4948-1
4 Classification and designation
4.1 Classification

The classification of the relevant steel grades is according to ISO 4948-1 and ISO 4948-2. Steel grades

C10E, C10R, C15E, C15R, C16E, C16R and 22Mn6 are non-alloy special steels. All other steel grades

covered by this part of ISO 683 are alloy special steels.
2 © ISO 2016 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 683-3:2016(E)
4.2 Designation

For the steel grades covered by this part of ISO 683, the steel names as given in the relevant tables are

allocated in accordance with ISO/TS 4949.
5 Information to be supplied by the purchaser
5.1 Mandatory information

The following information shall be supplied by the purchaser at the time of enquiry and order:

a) quantity to be delivered;

b) designation of the product form (slab, bloom, billet, round bar or square bar, wire rod, wide flats,

sheet, plate, strip, forging, etc.);

c) either the designation of the dimensional standard and the dimensions and tolerances selected

from this (see 7.8) or, for example, in the case of drop forgings, the designation of the drawing or

any other document covering the dimensions and tolerances required for the product;

d) a reference to this part of ISO 683, i.e. ISO 683-3;
e) the designation of the steel type given in Table 3;

f) standard designation for a test report 2.2 or, if required, any other type of inspection document in

accordance with ISO 10474 (or according to another regional standard, e.g. EN 10204 or JIS G 0415).

5.2 Options and/or supplementary or special requirements

A number of options are specified in this International Standard and listed below. If the purchaser does

not indicate the wish to implement any of these options, the products will be supplied in accordance

with the basic specifications of this part of ISO 683 (see 5.1):

a) if a heat-treatment condition other than the untreated condition is required, the symbol for this

other condition (see Table 1, column 2);

b) if a surface condition other than “hot worked” or a special surface quality is required, the surface

condition (see Table 2) and the surface quality (see 7.7.3);

c) any requirement for restricted hardenability scatter bands for alloy steels (+HH, +HL; see 7.1.1,

Table 6 and Figure 1);

d) if any supplementary requirement shall be complied with, the symbol and, where necessary, the

details of this supplementary requirement (see Annex A);

e) any requirement for the verification of non-metallic inclusion content (see 7.5);

f) verification of hardenability and, if agreed, the information about calculation of the hardenability

(see 9.2.2);

g) any requirement concerning suitability of bars and rod for bright drawing (see 7.7.4);

h) any requirement relating to removal of surface defects (see 7.7.5).
5.3 Ordering example

EXAMPLE 50 hot-rolled round bars in accordance with ISO 1035-1 with a nominal diameter of 40 mm and

a nominal length of 8 000 mm with diameter tolerance according to class S and with length tolerance according

to class L2 of ISO 1035-4 made of steel grade ISO 683-3, 20MnCr5 (see Table 3) in the heat-treatment condition

annealed (+A), surface blast cleaned (+BC) (see Table 2), product analysis/option A.3 with an inspection

certificate 3.1 in accordance with ISO 10474.
© ISO 2016 – All rights reserved 3
---------------------- Page: 8 ----------------------
ISO 683-3:2016(E)
50 Round bars ISO 1035 – 40,0S × 8 000L2
ISO 683-3 – 20MnCr5+A+BC, Option A.3
ISO 10474 – 3.1
6 Manufacturing process
6.1 General

The manufacturing process of the steel and of the products is, with the restrictions given by the

requirements in 6.2 to 6.4, left to the discretion of the manufacturer.

For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products,

see A.4.
6.2 Deoxidation
All steels shall be deoxidized.
6.3 Heat-treatment condition and surface condition at delivery
6.3.1 Normal condition at delivery

Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the

untreated condition, i.e. hot-worked condition.
6.3.2 Particular heat-treatment condition

If so agreed at the time of enquiry and order, the products shall be delivered in one of the heat-treatment

conditions given in Table 1, lines 3 to 8.
6.3.3 Particular surface conditions

If so agreed at the time of enquiry and order, the products shall be delivered in one of the particular

surface conditions given in Table 2, lines 3 to 6.
6.4 Traceability of the cast
The products shall be traceable to the cast, see Clause 10.
7 Requirements
7.1 Chemical composition, hardness and hardenability
7.1.1 General

Table 1 gives a survey on combinations of usual heat-treatment conditions at delivery, product forms

and requirements as specified in Tables 3 to 7 (chemical composition, hardenability, maximum hardness

and hardness range).

Unless otherwise agreed for alloy steels, the hardenability requirements given in Table 5 apply. If

agreed at the time of enquiry and order, alloy steels with restricted hardenability scatter bands given

in Table 6 or shown in Figure 1 shall be supplied.
4 © ISO 2016 – All rights reserved
---------------------- Page: 9 ----------------------
ISO 683-3:2016(E)
7.1.2 Chemical composition

The chemical composition determined by cast analysis shall comply with the values in Table 3.

Permissible deviations between the limiting values for cast analysis and the values for product analysis

are given in Table 4.

The product analysis shall be carried out when specified, at the time of the enquiry and order (see A.3).

7.2 Machinability

All steels are machinable in the conditions “soft-annealed”, “treated to hardness range”, “treated to

ferrite/pearlite structure” and “normalized.

Where improved machinability is required, the grades with a specified sulfur range should be ordered

and/or with a specific treatment to improve machinability (see also Table 3, footnote c).

7.3 Cold shearability

7.3.1 Under suitable shearing conditions (avoiding local stress peaks, preheating, application of blades

with a profile adapted to that of the product, etc.), all steels are cold shearable in the condition “soft-

annealed”.

7.3.2 Steel grades 28Cr4, 28CrS4, 20MnCr5, 20MnCrS5, 24CrMo4, 24CrMoS4, 22CrMoS3-5, 20MoCr4,

20MoCrS4, 16NiCr4, 16NiCrS4, 18NiCr5-4, 17CrNi6-6, 15NiCr13, 17NiCrMo6-4 and 18CrNiMo7-6, are,

under suitable conditions, also cold shearable when delivered in the condition “treated to improve

shearability” with the hardness requirements given in Table 7.

7.3.3 The non-alloy steels and steels 17Cr3, 17CrS3, 20Cr4, 20CrS4, 16MnCr5, 16MnCrS5, 16MnCrB5,

18CrMo4, 18CrMoS4, 20NiCrMo2-2 and 20NiCrMoS2-2 are, under suitable conditions, cold shearable

when delivered in the untreated condition.
7.4 Grain size

Unless otherwise agreed at the time of enquiry and order, the steel shall show a fine grain structure

with an austenitic grain size of 5 and finer, when tested in accordance with ISO 643. For verification,

see A.1.
7.5 Non-metallic inclusions
7.5.1 Microscopic inclusions

The special steels shall have a certain degree of cleanness, however, verification of the non-metallic

inclusion content requires a special agreement. If there is such an agreement at the time of enquiry

and order, the microscopic non-metallic inclusion content shall be determined to an agreed procedure

and within agreed limits in accordance with ISO 4967 or another standard, e.g. regional standards

EN 10247 or JIS G 0555.

For grades with specified minimum sulfur content, the agreement should not include sulphides.

7.5.2 Macroscopic inclusions

This requirement is applicable to the verification of the macroscopic inclusions in special steels. If

verification is agreed, the method and acceptance limits shall be agreed at the time of enquiry and order.

© ISO 2016 – All rights reserved 5
---------------------- Page: 10 ----------------------
ISO 683-3:2016(E)
7.6 Internal soundness

Where appropriate, requirements relating to the internal soundness of the products shall be agreed at

the time of inquiry and order (see A.2).
7.7 Surface condition

7.7.1 All products shall have a smooth surface finish appropriate to the manufacturing processes

applied.

7.7.2 Minor surface imperfections which may occur under normal manufacturing conditions, such as

prints originating from rolled-in scale, are not to be regarded as defects.

7.7.3 Bars and wire rod are delivered with surface class 1za2 according to ISO 9443 and hot-rolled

plates and wide flats shall be delivered with a surface according to ISO 7788, unless otherwise agreed at

the time of enquiry and order.

Where no International Standard on the surface quality of steel products exists, detailed requirements

referring to this characteristic shall, where appropriate, be agreed at the time of enquiry and order.

It is more difficult to detect and eliminate surface discontinuities from coiled products than from cut

lengths. This should be taken into account when agreements on surface quality are made.

NOTE Bars and wire rod for cold heading and cold extrusion are covered fully by ISO 4954.

7.7.4 If suitability of bars and rod for bright drawing is required, this shall be agreed at the time of

enquiry and order.

7.7.5 Removal of surface discontinuities by welding shall only be permitted with the approval of the

customer or his/her representative. If surface discontinuities are repaired, the method and maximum

depth of removal shall be agreed at the time of enquiry and order.
7.8 Shape, dimensions and tolerances

The nominal dimensions, tolerances on dimensions and shape of the product shall be agreed at the time

of enquiry and order, if possible, with reference to the dimensional standards applicable (see Annex C).

8 Inspection
8.1 Testing procedures and types of documents

8.1.1 Products complying with this part of ISO 683 shall be ordered and delivered with one of the

inspection documents as specified in ISO 10474 or another standard, e.g. regional standards EN 10204

or JIS G 0415. The type of document shall be agreed upon at the time of enquiry and order. If the order

does not contain any specification of this type, a test report shall be issued.

8.1.2 If, in accordance with the agreements made at the time of enquiry and order, a test report 2.2 is

to be provided, this shall cover the following information:
a) confirmation that the material complies with the requirements of the order;

b) results of the cast analysis for all elements specified in Table 3 for the steel grade concerned.

6 © ISO 2016 – All rights reserved
---------------------- Page: 11 ----------------------
ISO 683-3:2016(E)

8.1.3 If, in accordance with the agreements in the order, an inspection certificate 3.1 or 3.2 is to be

provided, the specific inspections and tests described in 8.3 and Clause 9 shall be carried out and the

results shall be confirmed in the inspection certificate.
In addition, the inspection certificate shall cover the following:
a) confirmation that the material complies with the requirements of the order;

b) results of the cast analysis for all elements specified in Table 3 for the steel grade concerned;

c) results of all inspections and tests ordered by supplementary requirements (see Annex A);

d) the symbol, letters or numbers relating the test certificates, the test pieces and products to each other.

8.2 Frequency of testing

The amount of testing, the sampling conditions and the test methods to be applied for the verification of

the requirements shall be in accordance with Tabl
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 683-3
ISO/TC 17/SC 4
Heat-treatable steels, alloy steels and
Secretariat: DIN
free-cutting steels —
Voting begins
on: 2016-03-25
Part 3:
Voting terminates
Case-hardening steels
on: 2016-05-25
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 3: Aciers pour cémentation
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 683-3:2016(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2016
---------------------- Page: 1 ----------------------
ISO/FDIS 683-3:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 683-3:2016(E)
Contents Page

Foreword ..........................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Classification and designation ............................................................................................................................................................... 2

4.1 Classification ............................................................................................................................................................................................. 2

4.2 Designation ................................................................................................................................................................................................ 3

5 Information to be supplied by the purchaser......................................................................................................................... 3

5.1 Mandatory information ................................................................................................................................................................... 3

5.2 Options and/or supplementary or special requirements .................................................................................. 3

5.3 Ordering example ................................................................................................................................................................................. 3

6 Manufacturing process .................................................................................................................................................................................. 4

6.1 General ........................................................................................................................................................................................................... 4

6.2 Deoxidation ................................................................................................................................................................................................ 4

6.3 Heat-treatment condition and surface condition at delivery ......................................................................... 4

6.3.1 Normal condition at delivery ................................................................................................................................ 4

6.3.2 Particular heat-treatment condition .................. ............................................................................................. 4

6.3.3 Particular surface conditions ................................................................................................................................ 4

6.4 Traceability of the cast ..................................................................................................................................................................... 4

7 Requirements .......................................................................................................................................................................................................... 4

7.1 Chemical composition, hardness and hardenability .............................................................................................. 4

7.1.1 General...................................................................................................................................................................................... 4

7.1.2 Chemical composition ................................................................................................................................................. 5

7.2 Machinability ............................................................................................................................................................................................ 5

7.3 Cold shearability .................................................................................................................................................................................... 5

7.4 Grain size ...................................................................................................................................................................................................... 5

7.5 Non-metallic inclusions ................................................................................................................................................................... 5

7.5.1 Microscopic inclusions ............................................................................................................................................... 5

7.5.2 Macroscopic inclusions .............................................................................................................................................. 5

7.6 Internal soundness .............................................................................................................................................................................. 6

7.7 Surface condition .................................................................................................................................................................................. 6

7.8 Shape, dimensions and tolerances ......................................................................................................................................... 6

8 Inspection .................................................................................................................................................................................................................... 6

8.1 Testing procedures and types of documents ................................................................................................................ 6

8.2 Frequency of testing ........................................................................................................................................................................... 7

8.3 Tests to be carried out for specific inspection ............................................................................................................. 7

8.3.1 General...................................................................................................................................................................................... 7

8.3.2 Visual and dimensional inspection .................................................................................................................. 7

9 Test methods ............................................................................................................................................................................................................. 7

9.1 Chemical analysis .................................................................................................................................................................................. 7

9.2 Hardness and hardenability tests ........................................................................................................................................... 7

9.2.1 Verification of hardness ............................................................................................................................................. 7

9.2.2 Verification of hardenability .................................................................................................................................. 7

9.3 Retests ............................................................................................................................................................................................................ 8

10 Marking .......................................................................................................................................................................................................................... 8

Annex A (normative) Supplementary or special requirements ............................................................................................29

Annex B (informative) Designation of steels given in this part of ISO 683 and of comparable

grades covered in various designation systems................................................................................................................31

Annex C (informative) Dimensional standards applicable to products complying with this

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ISO/FDIS 683-3:2016(E)

part of ISO 683 .....................................................................................................................................................................................................33

Annex D (informative) Classification of steel grades according to minimum tensile strength

as a function of diameter after hardening and tempering at 200 °C ...........................................................34

Bibliography .............................................................................................................................................................................................................................35

iv © ISO 2016 – All rights reserved
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ISO/FDIS 683-3:2016(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,

as well as information about ISO’s adherence to the World Trade Organization (WTO) principles in the

Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.

The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 4, Heat-treatable and

alloy steels.

This second edition cancels and replaces the first edition (ISO 683-3:2014), which has been revised.

ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy steels and free-

cutting steels:
— Part 1: Non-alloy steels for quenching and tempering
— Part 2: Alloy steels for quenching and tempering
— Part 3: Case-hardening steels
— Part 4: Free-cutting steels
— Part 5: Nitriding steels
— Part 14: Hot-rolled steels for quenched and tempered springs
— Part 15: Valve steels for internal combustion engines
— Part 17: Ball and roller bearing steels
— Part 18: Bright steel products
© ISO 2016 – All rights reserved v
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 683-3:2016(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 3:
Case-hardening steels
1 Scope
This part of ISO 683 specifies the technical delivery requirements for
— semi-finished products, hot formed, e.g. blooms, billets, slabs (see Note 1),
— bars (see Note 1),
— wire rod,
— finished flat products, and
— hammer or drop forgings (see Note 1)

manufactured from the case-hardening non-alloy or alloy steels listed in Table 3 and supplied in one

of the heat-treatment conditions given for the different types of products in Table 1 and in one of the

surface conditions given in Table 2.

The steels are, in general, intended for the manufacture of case-hardened (see 3.1) machine parts.

NOTE 1 Hammer-forged semi-finished products (blooms, billets, slabs, etc.), seamless rolled rings and

hammer-forged bars are covered under semi-finished products or bars and not under the term “hammer and

drop forgings”.

NOTE 2 For International Standards relating to steels complying with the requirements for the chemical

composition in Table 3, however, supplied in other product forms or treatment conditions than given above or

intended for special applications, and for other related International Standards, see the Bibliography.

In special cases, variations in these technical delivery requirements or additions to them can form the

subject of an agreement at the time of enquiry and order (see 5.2 and Annex A).

In addition to this part of ISO 683, the general technical delivery requirements of ISO 404 are applicable.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable to its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing

ISO 404, Steel and steel products — General technical delivery requirements
ISO 642:1999, Steel — Hardenability test by end quenching (Jominy test)
ISO 643, Steels — Micrographic determination of the apparent grain size
ISO 4885, Ferrous products — Heat treatments — Vocabulary

ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based

on chemical composition
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ISO/FDIS 683-3:2016(E)

ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main

quality classes and main property or application characteristics

ISO 4967, Steel — Determination of content of non-metallic inclusions — Micrographic method using

standard diagrams
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method

ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (scales A, B, C, D, E, F, G, H,

K, N, T)
ISO 6929, Steel products — Vocabulary

ISO 7788, Steel — Surface finish of hot-rolled plates and wide flats — Delivery requirements

ISO 9443, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire

rods — Technical delivery conditions
ISO 10474, Steel and steel products — Inspection documents

ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical

composition
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO/TS 4949, Steel names based on letter symbols
3 Terms and definitions

For the purposes of this document, the definitions of ISO 377, ISO 4885, ISO 4948-1, ISO 4948-2,

ISO 6929, ISO 14284 and the following apply.

NOTE For deviations from these terms and definitions, see Note 1 of the Scope and footnote a of Table 2.

3.1
case-hardening steels

structural steels with a relatively low carbon content, which are carburized or carbonitrided on their

surface and subsequently hardened

Note 1 to entry: These steels, after hardening, have a high degree of hardness in the surface zone and good

resistance to wear, while the core material is characterized principally by extreme toughness.

Note 2 to entry: Further, possibilities for heat treatment of case-hardening steels are, for example, nitrocarburizing

and nitriding.
3.2
non-alloy steel
as defined in ISO 4948-1
3.3
alloy steel
as defined in ISO 4948-1
4 Classification and designation
4.1 Classification

The classification of the relevant steel grades is according to ISO 4948-1 and ISO 4948-2. Steel grades

C10E, C10R, C15E, C15R, C16E, C16R and 22Mn6 are non-alloy special steels. All other steel grades

covered by this part of ISO 683 are alloy special steels.
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ISO/FDIS 683-3:2016(E)
4.2 Designation

For the steel grades covered by this part of ISO 683, the steel names as given in the relevant tables are

allocated in accordance with ISO/TS 4949.
5 Information to be supplied by the purchaser
5.1 Mandatory information

The following information shall be supplied by the purchaser at the time of enquiry and order:

a) quantity to be delivered;

b) designation of the product form (slab, bloom, billet, round bar or square bar, wire rod, wide flats,

sheet, plate, strip, forging, etc.);

c) either the designation of the dimensional standard and the dimensions and tolerances selected

from this (see 7.8) or, for example, in the case of drop forgings, the designation of the drawing or

any other document covering the dimensions and tolerances required for the product;

d) a reference to this part of ISO 683, i.e. ISO 683-3;
e) the designation of the steel type given in Table 3;

f) standard designation for a test report 2.2 or, if required, any other type of inspection document in

accordance with ISO 10474 (or according to another regional standard, e.g. EN 10204 or JIS G 0415).

5.2 Options and/or supplementary or special requirements

A number of options are specified in this International Standard and listed below. If the purchaser does

not indicate the wish to implement any of these options, the products will be supplied in accordance

with the basic specifications of this part of ISO 683 (see 5.1):

a) if a heat-treatment condition other than the untreated condition is required, the symbol for this

other condition (see Table 1, column 2);

b) if a surface condition other than “hot worked” or a special surface quality is required, the surface

condition (see Table 2) and the surface quality (see 7.7.3);

c) any requirement for restricted hardenability scatter bands for alloy steels (+HH, +HL; see 7.1.1,

Table 6 and Figure 1);

d) if any supplementary requirement shall be complied with, the symbol and, where necessary, the

details of this supplementary requirement (see Annex A);

e) any requirement for the verification of non-metallic inclusion content (see 7.5);

f) verification of hardenability and, if agreed, the information about calculation of the hardenability

(see 9.2.2);

g) any requirement concerning suitability of bars and rod for bright drawing (see 7.7.4);

h) any requirement relating to removal of surface defects (see 7.7.5).
5.3 Ordering example

EXAMPLE 50 hot-rolled round bars in accordance with to ISO 1035-1 with a nominal diameter of 40 mm and

a nominal length of 8 000 mm with diameter tolerance according to class S and with length tolerance according

to class L2 of ISO 1035-4 made of steel grade ISO 683-3, 20MnCr5 (see Table 3) in the heat-treatment condition

annealed (+A), surface blast cleaned (+BC) (see Table 2), product analysis/option A.3 with an inspection

certificate 3.1 in accordance with ISO 10474.
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ISO/FDIS 683-3:2016(E)
50 Round bars ISO 1035 - 40,0S × 8 000L2
ISO 683-3 - 20MnCr5+A+BC, Option A.3
ISO 10474 - 3.1
6 Manufacturing process
6.1 General

The manufacturing process of the steel and of the products is, with the restrictions given by the

requirements in 6.2 to 6.4, left to the discretion of the manufacturer.

For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products,

see A.4.
6.2 Deoxidation
All steels shall be deoxidized.
6.3 Heat-treatment condition and surface condition at delivery
6.3.1 Normal condition at delivery

Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the

untreated condition, i.e. hot-worked condition.
6.3.2 Particular heat-treatment condition

If so agreed at the time of enquiry and order, the products shall be delivered in one of the heat-treatment

conditions given in Table 1, lines 3 to 8.
6.3.3 Particular surface conditions

If so agreed at the time of enquiry and order, the products shall be delivered in one of the particular

surface conditions given in Table 2, lines 3 to 6.
6.4 Traceability of the cast
The products shall be traceable to the cast, see Clause 10.
7 Requirements
7.1 Chemical composition, hardness and hardenability
7.1.1 General

Table 1 gives a survey on combinations of usual heat-treatment conditions at delivery, product forms

and requirements as specified in Tables 3 to 7 (chemical composition, hardenability, maximum hardness

and hardness range).

Unless otherwise agreed for alloy steels, the hardenability requirements given in Table 5 apply. If

agreed at the time of enquiry and order, alloy steels with restricted hardenability scatter bands given

in Table 6 or shown in Figure 1 shall be supplied.
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ISO/FDIS 683-3:2016(E)
7.1.2 Chemical composition

The chemical composition determined by cast analysis shall comply with the values in Table 3.

Permissible deviations between the limiting values for cast analysis and the values for product analysis

are given in Table 4.

The product analysis shall be carried out when specified, at the time of the enquiry and order (see A.3).

7.2 Machinability

All steels are machinable in the conditions “soft-annealed”, “treated to hardness range”, “treated to

ferrite/pearlite structure” and “normalized.

Where improved machinability is required, the grades with a specified sulfur range should be ordered

and/or with a specific treatment to improve machinability (see also Table 3, footnote c).

7.3 Cold shearability

7.3.1 Under suitable shearing conditions (avoiding local stress peaks, preheating, application of blades

with a profile adapted to that of the product, etc.), all steels are cold shearable in the condition “soft-

annealed”.

7.3.2 Steel grades 28Cr4, 28CrS4, 20MnCr5, 20MnCrS5, 24CrMo4, 24CrMoS4, 22CrMoS3-5, 20MoCr4,

20MoCrS4, 16NiCr4, 16NiCrS4, 18NiCr5-4, 17CrNi6-6, 15NiCr13, 17NiCrMo6-4 and 18CrNiMo7-6, are,

under suitable conditions, also cold shearable when delivered in the condition “treated to improve

shearability” with the hardness requirements given in Table 7.

7.3.3 The non-alloy steels and steels 17Cr3, 17CrS3, 20Cr4, 20CrS4, 16MnCr5, 16MnCrS5, 16MnCrB5,

18CrMo4, 18CrMoS4, 20NiCrMo2-2 and 20NiCrMoS2-2 are, under suitable conditions, cold shearable

when delivered in the untreated condition.
7.4 Grain size

Unless otherwise agreed at the time of enquiry and order, the steel shall show a fine grain structure

with an austenitic grain size of 5 and finer, when tested in accordance with ISO 643. For verification,

see A.1.
7.5 Non-metallic inclusions
7.5.1 Microscopic inclusions

The special steels shall have a certain degree of cleanness, however, verification of the non-metallic

inclusion content requires a special agreement. If there is such an agreement at the time of enquiry

and order, the microscopic non-metallic inclusion content shall be determined to an agreed procedure

and within agreed limits in accordance with ISO 4967 or another standard, e.g. regional standards

EN 10247 or JIS G 0555.

For grades with specified minimum sulfur content, the agreement should not include sulphides.

7.5.2 Macroscopic inclusions

This requirement is applicable to the verification of the macroscopic inclusions in special steels. If

verification is agreed, the method and acceptance limits shall be agreed at the time of enquiry and order.

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ISO/FDIS 683-3:2016(E)
7.6 Internal soundness

Where appropriate, requirements relating to the internal soundness of the products shall be agreed at

the time of inquiry and order (see A.2).
7.7 Surface condition

7.7.1 All products shall have a smooth surface finish appropriate to the manufacturing processes

applied.

7.7.2 Minor surface imperfections which may occur under normal manufacturing conditions, such as

prints originating from rolled-in scale, are not to be regarded as defects.

7.7.3 Bars and wire rod are delivered with surface class 1za2 according to ISO 9443 and hot-rolled

plates and wide flats shall be delivered with a surface according ISO 7788, unless otherwise agreed at the

time of enquiry and order.

Where no International Standard on the surface quality of steel products exists, detailed requirements

referring to this characteristic shall, where appropriate, be agreed at the time of enquiry and order.

It is more difficult to detect and eliminate surface discontinuities from coiled products than from cut

lengths. This should be taken into account when agreements on surface quality are made.

NOTE Bars and wire rod for cold heading and cold extrusion are covered fully by ISO 4954.

7.7.4 If suitability of bars and rod for bright drawing is required, this shall be agreed at the time of

enquiry and order.

7.7.5 Removal of surface discontinuities by welding shall only be permitted with the approval of the

customer or his/her representative. If surface discontinuities are repaired, the method and maximum

depth of removal shall be agreed at the time of enquiry and order.
7.8 Shape, dimensions and tolerances

The nominal dimensions, tolerances on dimensions and shape of the product shall be agreed at the time

of enquiry and order, if possible, with reference to the dimensional standards applicable (see Annex C).

8 Inspection
8.1 Testing procedures and types of documents

8.1.1 Products complying with this part of ISO 683 shall be ordered and delivered with one of the

inspection documents as specified in ISO 10474 or another standard, e.g. regional standards EN 10204

or JIS G 0415. The type of document shall be agreed upon at the time of enquiry and order. If the order

does not contain any specification of this type, a test report shall be issued.

8.1.2 If, in accordance with the agreements made at the time of enquiry and order, a test report 2.2 is

to be provided, this shall cover the following information:
a) confirmation that the material complies with the requirements of the order;

b) results of the cast analysis for all elements specified in Table 3 for the steel grade concerned.

6 © ISO 2016 – All rights reserved
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ISO/FDIS 683-3:2016(E)

8.1.3 If, in accordance with the agreements in the order, an inspection certificate 3.1 or 3.2 is to be

provided, the specific inspections and tests described in 8.3 and Clause 9 shall be carried out and the

results shall be confirmed in the inspection certificate.
In addition,
...

NORME ISO
INTERNATIONALE 683-3
Deuxième édition
2016-07-15
Aciers pour traitement thermique,
aciers alliés et aciers pour
décolletage —
Partie 3:
Aciers pour cémentation
Heat-treatable steels, alloy steels and free-cutting steels —
Part 3: Case-hardening steels
Numéro de référence
ISO 683-3:2016(F)
ISO 2016
---------------------- Page: 1 ----------------------
ISO 683-3:2016(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2016

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette

publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,

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être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

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Publié en Suisse
ii © ISO 2016 – Tous droits réservés
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ISO 683-3:2016(F)
Sommaire Page

Avant-propos ................................................................................................................................................................................................................................v

1 Domaine d'application ................................................................................................................................................................................... 1

2 Références normatives ................................................................................................................................................................................... 1

3 Termes et définitions ....................................................................................................................................................................................... 2

4 Classification et désignation .................................................................................................................................................................... 3

4.1 Classification ............................................................................................................................................................................................. 3

4.2 Désignation ................................................................................................................................................................................................ 3

5 Informations à fournir par l'acheteur ............................................................................................................................................ 3

5.1 Informations obligatoires .............................................................................................................................................................. 3

5.2 Options et/ou exigences supplémentaires ou particulières ............................................................................ 3

5.3 Exemple de commande .................................................................................................................................................................... 4

6 Procédé d'élaboration .................................................................................................................................................................................... 4

6.1 Généralités .................................................................................................................................................................................................. 4

6.2 Désoxydation ............................................................................................................................................................................................ 4

6.3 État de traitement thermique et état de surface à la livraison ...................................................................... 4

6.3.1 État normal de livraison ............................................................................................................................................ 4

6.3.2 État particulier de traitement thermique ................................................................................................... 4

6.3.3 État de surface particulier ....................................................................................................................................... 4

6.4 Traçabilité de la coulée .................................................................................................................................................................... 4

7 Exigences ...................................................................................................................................................................................................................... 5

7.1 Composition chimique, dureté et trempabilité ........................................................................................................... 5

7.1.1 Généralités ............................................................................................................................................................................ 5

7.1.2 Composition chimique ................................................................................................................................................ 5

7.2 Usinabilité ................................................................................................................................................................................................... 5

7.3 L'aptitude au cisaillage à froid ................................................................................................................................................... 5

7.4 Taille de grain ........................................................................................................................................................................................... 5

7.5 Inclusions non métalliques .......................................................................................................................................................... 6

7.5.1 Inclusions microscopiques ...................................................................................................................................... 6

7.5.2 Inclusions macroscopiques .................................................................................................................................... 6

7.6 Santé interne ............................................................................................................................................................................................. 6

7.7 État de surface ......................................................................................................................................................................................... 6

7.8 Forme, dimensions et tolérances ............................................................................................................................................ 7

8 Contrôle.......................................................................................................................................................................................................................... 7

8.1 Procédures d'essai et types de documents ..................................................................................................................... 7

8.2 Fréquence des essais ......................................................................................................................................................................... 7

8.3 Essais à réaliser pour un contrôle spécifique ............................................................................................................... 7

8.3.1 Généralités ............................................................................................................................................................................ 7

8.3.2 Contrôles visuels et dimensionnels ................................................................................................................. 8

9 Méthodes d'essai .................................................................................................................................................................................................. 8

9.1 Analyse chimique .................................................................................................................................................................................. 8

9.2 Essais de dureté et de trempabilité ....................................................................................................................................... 8

9.2.1 Vérifications de la dureté .......................................................................................................................................... 8

9.2.2 Vérifications de la trempabilité ........................................................................................................................... 8

9.3 Contre-essais ............................................................................................................................................................................................ 8

10 Marquage ...................................................................................................................................................................................................................... 8

Annexe A (normative) Exigences supplémentaires ou particulières ..............................................................................29

Annexe B (informative) Comparaison des désignations d'aciers indiquées dans cette partie

de ISO 683 avec d'autres nuances d'acier présentées dans d'autres systèmes de

désignation ..............................................................................................................................................................................................................31

© ISO 2016 – Tous droits réservés iii
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ISO 683-3:2016(F)

Annexe C (informative) Normes dimensionnelles applicables aux produits conformes à

cette partie de l'ISO 683 .............................................................................................................................................................................33

Annexe D (informative) Classification des nuances d'acier selon la résistance à la traction

minimale en fonction du diamètre après trempe et revenu à 200 °C .........................................................34

Bibliographie ...........................................................................................................................................................................................................................35

iv © ISO 2016 – Tous droits réservés
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ISO 683-3:2016(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes

nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est

en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.

L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www

.iso .org/directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www .iso .org/brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la signification des termes et expressions spécifiques de l'ISO liés à l'évaluation

de la conformité, ou pour toute information au sujet de l'adhésion de l'ISO aux principes de l’Organisation

mondiale du commerce (OMC) concernant les obstacles techniques au commerce (OTC), voir le lien

suivant: www .iso .org/iso/fr/avant -propos .html.

Le comité chargé de l'élaboration du présent document est l’ISO/TC 17, Acier, sous-comité SC 4, Aciers

pour traitements thermiques et aciers alliés.

Cette seconde édition annule et remplace la première édition (ISO 683-3:2014), qui a fait l’objet d’une

révision mineure.

L’ISO 683 est constituée des parties suivantes, présentées sous le titre général Aciers pour traitement

thermique, aciers alliés et aciers pour décolletage:
— Partie 1: Aciers non alliés pour trempe et revenu
— Partie 2: Aciers alliés pour trempe et revenu
— Partie 3: Aciers pour cémentation
— Partie 4: Aciers pour décolletage
— Partie 5: Aciers pour nitruration
— Partie 14: Aciers laminés à chaud pour ressorts trempés et revenus
— Partie 15: Aciers pour soupapes de moteurs à combustion interne
— Partie 17: Aciers pour roulements
— Partie 18: Produits en aciers transformés à froid
© ISO 2016 – Tous droits réservés v
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NORME INTERNATIONALE ISO 683-3:2016(F)
Aciers pour traitement thermique, aciers alliés et aciers
pour décolletage —
Partie 3:
Aciers pour cémentation
1 Domaine d'application

La présente partie de l'ISO 683 spécifie les conditions techniques de livraison des:

— demi-produits formés à chaud, comme par exemple les blooms, billettes et brames (voir Note 1);

— barres (voir Note 1);
— fils machine;
— produits plats finis; et
— pièces forgées par martelage ou estampage (voir Note 1)

fabriqués à partir d'aciers alliés ou non alliés pour cémentation énumérés dans le Tableau 3 et livrés

dans l'un des états de traitement thermique donnés pour les différents types de produits dans le

Tableau 1 et dans l'un des états de surface donnés dans le Tableau 2.

Les aciers sont en général destinés à la fabrication de pièces mécaniques cémentées (voir 3.1).

NOTE 1 Les produits semi-finis forgés par martelage (blooms, billettes, brames, etc.), les anneaux laminés

sans soudure et les barres forgées par martelage figurent parmi les produits semi-finis ou les barres, et non sous

l'appellation «pièces forgées par martelage ou estampage».

NOTE 2 Pour les Normes internationales relatives aux aciers qui sont conformes aux exigences de composition

chimique du Tableau 3, mais fournis sous d’autres formes de produits ou dans des états de traitement autres

que ceux indiqués ci-dessus, ou qui sont destinés à des applications spéciales, ainsi que pour d'autres Normes

internationales analogues, voir la Bibliographie.

Dans certains cas particuliers, il est possible de déroger aux présentes conditions techniques de

livraison ou d'en ajouter d'autres, à condition d'en convenir au moment de l'appel d'offres et de la

commande (voir 5.2 et Annexe A).

En plus de cette partie de l'ISO 683, les conditions générales techniques de livraison de l'ISO 404 sont

applicables.
2 Références normatives

Les documents ci-après, dans leur intégralité ou non, sont des références normatives indispensables à

l'application du présent document. Pour les références datées, seule l'édition citée s'applique. Pour les

références non datées, la dernière édition du document de référence s'applique (y compris les éventuels

amendements).

ISO 377, Acier et produits en acier — Position et préparation des échantillons et éprouvettes pour essais

mécaniques

ISO 404, Aciers et produits sidérurgiques — Conditions générales techniques de livraison

ISO 642:1999, Acier — Essai de trempabilité par trempe en bout (essai Jominy)
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ISO 683-3:2016(F)
ISO 643, Aciers — Détermination micrographique de la grosseur de grain apparente
ISO 4885, Matériaux ferreux — Traitements thermiques — Vocabulaire

ISO 4948-1, Aciers — Classification — Partie 1: Classification en aciers alliés et en aciers non alliés basée

sur la composition chimique

ISO 4948-2, Aciers — Classification — Partie 2: Classification des aciers alliés et aciers non alliés en fonction

des principales classes de qualité et des caractéristiques principales de propriétés ou d'application

ISO 4967, Aciers — Détermination de la teneur en inclusions non métalliques — Méthode micrographique à

l’aide d’images types

ISO 6506-1, Matériaux métalliques — Essai de dureté Brinell — Partie 1: Méthode d'essai

ISO 6508-1, Matériaux métalliques — Essai de dureté Rockwell — Partie 1: Méthode d'essai

ISO 6929, Produits en acier — Vocabulaire

ISO 7788, Acier — État de surface des tôles et larges-plats laminés à chaud — Conditions de livraison

ISO 9443, Classes de qualité de surface des barres et fils-machine laminés à chaud

ISO 10474, Aciers et produits sidérurgiques — Documents de contrôle

ISO 14284, Fontes et aciers — Prélèvement et préparation des échantillons pour la détermination de la

composition chimique

ISO/TR 9769, Aciers et fontes — Vue d'ensemble des méthodes d'analyse disponibles

ISO/TS 4949, Désignations des aciers fondées sur des lettres symboles
3 Termes et définitions

Pour les besoins du présent document, les définitions de l'ISO 377, l'ISO 4885, l'ISO 4948-1, l'ISO 4948-2,

l'ISO 6929, ISO 14284 et les suivants s'appliquent.

NOTE Pour les variantes de ces termes et définitions, voir la Note 1 du Domaine d'application et la note de

bas de tableau a du Tableau 2.
3.1
aciers de cémentation

aciers de construction ayant une teneur en carbone relativement faible, destinés à un traitement de

cémentation ou de carbonitruration sur leur surface et suivi d'une trempe

Note 1 à l'article: Après trempe, ces aciers se caractérisent par une dureté élevée dans la zone de surface et une

bonne résistance à l’usure, alors que le cœur du matériau présente une grande ténacité.

Note 2 à l'article: De plus, la nitrocarburation et la nitruration sont deux autres possibilités de traitement

thermique des aciers de cémentation.
3.2
acier non allié
défini dans l'ISO 4948-1
3.3
acier allié
défini dans l'ISO 4948-1
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ISO 683-3:2016(F)
4 Classification et désignation
4.1 Classification

La classification des nuances d'acier appropriées est appliquée conformément à l'ISO 4948-1 et à

l'ISO 4948-2. Les nuances d'acier C10E, C10R, C15E, C15R, C16E, C16R et 22Mn6 sont des aciers spéciaux

non alliés. Toutes les autres nuances d'acier concernées par cette partie de l'ISO 683 sont des aciers

spéciaux alliés.
4.2 Désignation

Pour les nuances d'acier concernées par cette partie de l’ISO 683, les noms des aciers tels qu'ils sont

donnés dans les tableaux correspondants sont attribués conformément à l'ISO/TS 4949.

5 Informations à fournir par l'acheteur
5.1 Informations obligatoires

Les informations suivantes doivent être fournies par l'acheteur lors de l'appel d'offres et de la

commande:
a) la quantité à livrer;

b) la désignation de la forme du produit (par exemple brame, bloom, billette, barre ronde ou carrée,

fils machine, large plat, feuillard, tôle, bande, pièce forgée, etc.);

c) soit la désignation de la norme dimensionnelle et les dimensions et les tolérances choisies à partir

de celle-ci (voir 7.8), soit, par exemple, dans le cas de pièces forgées par estampage, la désignation

de l'étirage ou de tout autre document concernant les dimensions et les tolérances requises pour le

produit;
d) la référence à cette partie de l'ISO 683, c'est-à-dire, l'ISO 683-3;
e) la désignation du type d'acier est donnée dans le Tableau 3;

f) la désignation normalisée correspondant au rapport d'essai (2.2) ou, sur demande, à tout autre

document de contrôle conforme à l'ISO 10474 ou à une autre norme régionale, par exemple,

EN 10204 ou JIS G 0415).
5.2 Options et/ou exigences supplémentaires ou particulières

Un certain nombre d'options sont spécifiées dans la présente Norme internationale et sont répertoriées

ci-dessous. Si l'acheteur ne précise pas vouloir mettre en œuvre l'une de ces options, les produits seront

commandés conformément aux spécifications de base de cette partie de l'ISO 683 (voir 5.1):

a) Si un état de traitement thermique autre que l'état non traité est requis, le symbole pour cet autre

état (voir Tableau 1, colonne 2);

b) Si un état de surface autre que l'état «écroui à chaud» ou une qualité particulière de surface est

requis, l'état de surface (voir Tableau 2) et la qualité de surface (voir 7.7.3);

c) exigences relatives aux bandes restreintes de dispersion de trempabilité pour les aciers alliés

(symboles +HH, + HL, voir 7.1.1, Tableau 6 et Figure 1);

d) exigences supplémentaires qui doivent être respectées selon le symbole et, le cas échéant, les

détails de cette exigence supplémentaire (voir Annexe A);

e) exigences relatives à la vérification de la teneur en inclusions non métalliques (voir 7.5);

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ISO 683-3:2016(F)

f) vérifications de la trempabilité et, le cas échéant, informations relatives au calcul de la trempabilité

(voir 9.2.2);

g) exigences relatives à la possibilité de soumettre les barres et les fils machine à l'étirage à froid

(voir 7.7.4);
h) exigences relatives à l'élimination des défauts superficiels (voir 7.7.5).
5.3 Exemple de commande

EXEMPLE 50 barres rondes laminées à chaud avec un diamètre nominal de 40 mm et une longueur nominale

de 8 000 mm selon l'ISO 1035-1 avec une tolérance de diamètre de classe S et de longueur de classe L2 selon

l'ISO 1035-4, fabriqués en nuance d'acier ISO 683-3, 20MnCr5 (voir Tableau 3), suivant la condition de traitement

thermique adoucie (+A), une surface grenaillée (+BC) (voir Tableau 2), une analyse sur produit/option A.3 avec

un certificat d'inspection 3.1 tel que spécifié dans l'ISO 10474.
50 barres rondes ISO 1035 – 40,0S × 8 000L2
ISO 683-3 – 20MnCr5+A+BC, Option A.3
ISO 10474 – 3.1
6 Procédé d'élaboration
6.1 Généralités

Le procédé d'élaboration de l'acier et des produits est laissé au choix du fabricant sous réserve des

limites données par les exigences indiquées de 6.2 à 6.4.

Pour le degré minimal de réduction ou le degré minimal de déformation de l'épaisseur sur les produits

laminés et forgés, voir A.4.
6.2 Désoxydation
Tous les aciers doivent être désoxydés.
6.3 État de traitement thermique et état de surface à la livraison
6.3.1 État normal de livraison

Sauf accord contraire lors de l'appel d'offres et de la commande, les produits doivent être livrés à l'état

non traité, c’est-à-dire écroui à chaud.
6.3.2 État particulier de traitement thermique

Par accord au moment de l'appel d'offres et de la commande, les produits doivent être livrés dans l'un

des états de traitement thermique spécifiés dans le Tableau 1, lignes 3 à 8.
6.3.3 État de surface particulier

Par accord au moment de l'appel d'offres et de la commande, les produits doivent être livrés dans l'un

des états de surface particuliers spécifiés dans le Tableau 2, lignes 3 à 6.
6.4 Traçabilité de la coulée
Les produits doivent pouvoir être retracés jusqu'à la coulée (voir Article 10).
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ISO 683-3:2016(F)
7 Exigences
7.1 Composition chimique, dureté et trempabilité
7.1.1 Généralités

Le Tableau 1 fournit un relevé des combinaisons des états habituels de traitement thermiques à la

livraison, des formes de produit et des exigences, spécifiés dans les Tableaux 3 à 7 (composition

chimique, trempabilité, dureté maximale et fourchette de dureté).

Sauf accord contraire, les exigences de trempabilité indiquées au Tableau 5 s'appliquent aux aciers

alliés. En cas d'accord au moment de l'appel d'offres et de la commande, il faut fournir des aciers alliés

avec les bandes restreintes de dispersion de trempabilité indiquées dans le Tableau 6 ou à la Figure 1.

7.1.2 Composition chimique

La composition chimique déterminée par analyse de coulée doit être conforme aux valeurs présentées

dans le Tableau 3.

Les écarts admissibles entre les valeurs limites de l'analyse de coulée et les valeurs de l'analyse sur

produit sont présentés dans le Tableau 4.

L'analyse sur produit doit être réalisée lorsque cela est spécifié au moment de l'appel d'offres et de la

commande (voir A.3).
7.2 Usinabilité

Tous les aciers sont usinables en l’état «adouci», «traité pour une fourchette de dureté», «traité pour

une structure ferrite/perlite» et «normalisé».

Lorsqu'une usinabilité plus importante est nécessaire, il convient de commander des nuances avec

une gamme de soufre spécifiée et/ou avec un traitement spécifique pour améliorer l’usinabilité (voir

également le Tableau 3, note de bas de tableau c).
7.3 L'aptitude au cisaillage à froid

7.3.1 Dans des conditions de cisaillage appropriées (pas de crête de contraintes localisées,

préchauffage, utilisation de lames de profil adapté à celui du produit, etc.), tous les aciers sont cisaillables

à froid à l'état «adouci».

7.3.2 Dans des conditions convenables, les nuances d'acier 28Cr4, 28CrS4, 20MnCr5, 20MnCrS5,

24CrMo4, 24CrMoS4, 22CrMoS3-5, 20MoCr4, 20MoCrS4, 16NiCr4, 16NiCrS4, 18NiCr5-4, 17CrNi6-6,

15NiCr13, 17NiCrMo6-4 et 18CrNiMo7-6, sont également cisaillables à froid, si elles sont livrées à l'état

«traité pour une meilleure aptitude au cisaillage» en respectant les exigences de dureté données au

Tableau 7.

7.3.3 Dans des conditions convenables, les aciers non alliés et aciers 17Cr3, 17CrS3, 20Cr4, 20CrS4,

16MnCr5, 16MnCrS5, 16MnCrB5, 18CrMo4, 18CrMoS4, 20NiCrMo2-2 et 20NiCrMoS2-2 sont cisaillables

à froid, s'ils sont livrés à l'état non traité.
7.4 Taille de grain

Sauf accord contraire au moment de l'appel d'offres et de la commande, l'acier doit présenter une

structure à grains fins d'une grosseur de grain d'austénite de 5 et plus fin lors de l'essai réalisé

conformément à l'ISO 643. Pour la vérification, voir A.1.
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ISO 683-3:2016(F)
7.5 Inclusions non métalliques
7.5.1 Inclusions microscopiques

Les aciers spéciaux doivent avoir un certain degré de pureté, toutefois, la preuve de la teneur

en inclusions non métalliques doit faire l'objet d'un accord spécial. S'il y a un accord au moment de

l'appel d'offres et de la commande, la teneur en inclusions microscopiques non métalliques doit être

déterminée conformément à la procédure convenue et dans les limites convenues selon l’ISO 4967 ou

d'autres normes, par exemple normes régionales EN 10247 ou JIS G 0555.

Pour les nuances à faible teneur en soufre spécifiée, il convient que l’accord n’inclue pas les sulfures.

7.5.2 Inclusions macroscopiques

Cette exigence est applicable à la vérification de la teneur inclusionnaire macroscopique dans des aciers

spéciaux. Si une vérification est demandée, la méthode et les limites d’acceptations doivent faire l’objet

d’un accord au moment de l’appel d’offres et de la commande.
7.6 Santé interne

Le cas échéant, les exigences relatives à la santé interne des produits doivent être convenues à la date

de l'appel d'offres et de la commande (voir A.2).
7.7 État de surface

7.7.1 Tous les produits doivent avoir une finition de surface lisse adaptée aux processus de fabrication

utilisés.

7.7.2 Les imperfections superficielles mineures qui peuvent se produire dans des conditions normales

d'élaboration, telles que des traces provoquées par incrustation de calamine, ne doivent pas être

considérées comme des défauts.

7.7.3 Les barres et les fils machine sont livrés avec un état de surface de classe 1za2 conformément

à l'ISO 9443 et les tôles laminées à chaud et les larges plats doivent être livrés avec une surface définie

dans l'ISO 7788, sauf accord contraire lors de l'appel d'offres et de la commande.

Lorsqu'il n'existe aucune Norme internationale sur la qualité de surface des produits en acier, des

exigences détaillées concernant cette caractéristique doivent, le cas échéant, être convenues au moment

de l'appel d'offres et de la commande.

Il est plus difficile de déceler et d'éliminer les discontinuités superficielles sur les bobines que sur les

barres. Il convient de tenir compte de ce facteur dans les accords sur la qualité de surface des produits.

NOTE Les barres et fils machine pour frappe à froid et extrusion à froid sont concernés entièrement par

l'ISO 4954.

7.7.4 Si l'aptitude des barres et des fils machine à l'étirage à froid est nécessaire,

...

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