prEN ISO 683-3

Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels (ISO/DIS 683-3:2020)

Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle - Teil 3: Einsatzstähle (ISO/DIS 683-3:2020)

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 3: Aciers pour cémentation (ISO/DIS 683-3:2020)

Toplotno obdelana, legirana in avtomatna jekla - 3. del: Cementacijska jekla (ISO/DIS 683-3:2020)

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN ISO 683-3:2020
01-julij-2020
Toplotno obdelana, legirana in avtomatna jekla - 3. del: Cementacijska jekla
(ISO/DIS 683-3:2020)

Heat-treatable steels, alloy steels and free-cutting steels - Part 3: Case-hardening steels

(ISO/DIS 683-3:2020)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 3: Einsatzstähle (ISO/DIS 683-3:2020)

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 3:

Aciers pour cémentation (ISO/DIS 683-3:2020)
Ta slovenski standard je istoveten z: prEN ISO 683-3
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.20 Visokokakovostna jekla Stainless steels
oSIST prEN ISO 683-3:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 683-3:2020
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oSIST prEN ISO 683-3:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 683-3
ISO/TC 17/SC 4 Secretariat: DIN
Voting begins on: Voting terminates on:
2020-04-30 2020-07-23
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
ICS: 77.140.20; 77.140.10
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
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WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 683-3:2020(E)
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 SUPPORTING DOCUMENTATION. ISO 2020
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oSIST prEN ISO 683-3:2020
ISO/DIS 683-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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ii © ISO 2020 – All rights reserved
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oSIST prEN ISO 683-3:2020
ISO/DIS 683-3:2020(E)
Contents Page

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

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

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

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

4 Classification and designation ............................................................................................................................................................... 3

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

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 ................................................................................................................................................................................. 4

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 .......................................................................................................................................................................................................... 5

7.1 Chemical composition, hardness and hardenability .............................................................................................. 5

7.1.1 General...................................................................................................................................................................................... 5

7.1.2 Hardenability ...................................................................................................................................................................... 5

7.1.3 Chemical composition ................................................................................................................................................. 5

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

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

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

7.5 Non-metallic inclusions ................................................................................................................................................................... 6

7.5.1 Microscopic inclusions ............................................................................................................................................... 6

7.5.2 Macroscopic inclusions .............................................................................................................................................. 6

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

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

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

8 Inspection .................................................................................................................................................................................................................... 7

8.1 Testing procedures and types of documents ................................................................................................................ 7

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 ........................................................................................................................................... 8

9.2.1 Verification of hardness ............................................................................................................................................. 8

9.2.2 Verification of hardenability .................................................................................................................................. 8

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

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

Annex A (normative) Supplementary or special requirements ............................................................................................31

Annex B (informative) Designation of steels given in this document and of comparable

grades covered in various designation systems................................................................................................................33

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

document ...................................................................................................................................................................................................................35

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

as a function of diameter after hardening and tempering at 200 °C ...........................................................36

Bibliography .............................................................................................................................................................................................................................37

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oSIST prEN ISO 683-3:2020
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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 of the voluntary nature of standards, 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 www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat

treatable and alloy steels.

This fourth edition cancels and replaces the third edition (ISO 683-3:2019), which has been technically

revised. The main changes compared with the previous edition are as follows:
— steel grades 23MnCrMo5-5-4 and 17NiCrMoS6-4 have been added;

— the lower silicon content in Table 3 was deleted and replaced by a new footnote e to Table 3 and a

modified text in 6.2;
— editorial amendments.
A list of all parts in the ISO 683 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
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oSIST prEN ISO 683-3:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 683-3:2020(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 3:
Case-hardening steels
1 Scope
This document 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 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 document, the general technical delivery requirements of ISO 404 are applicable.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. 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 materials — 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 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main

quality classes and main property or application characteristics
ISO/TS 4949, Steel names based on letter symbols

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
ISO 6929, Steel products — Vocabulary

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

ISO 9443, Surface quality classes for hot-rolled bars and wire rod
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO 10474, Steel and steel products — Inspection documents

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

composition
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 377, ISO 4885, ISO 4948-1,

ISO 4948-2, ISO 6929, ISO 14284 and the following apply.

Note 1 to entry For deviations from these terms and definitions, see NOTE 1 of the Scope and footnote of

Table 2.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
case-hardening steels

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
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4 Classification and designation
4.1 Classification

The classification of the relevant steel grades is in accordance with 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 document are alloy special steels.
4.2 Designation

For the steel grades covered by this document, the steel names as given in the relevant tables shall be

allocated in accordance with ISO/TS 4949.

A comparison between the designation of steels given in this document with various designation

systems is given in Annex B.
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(s) and the dimensions and tolerances selected

from this or these (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 document, 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 in accordance with 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 document 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 document (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);

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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.
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. Deoxidation is usually done with silicon (for required minimum content

see also Table 3, footenote e) and in this case the machinability is better. If it is done by other elements

cold formability is improved and internal oxidation in the carburising process can be minimized.

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, row numbers 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, row numbers 3 to 6.
6.4 Traceability of the cast
The products shall be traceable to the cast, see Clause 10.
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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).
7.1.2 Hardenability

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.

A classification of steel grades according to minimum tensile strength as a function of diameter after

hardening and tempering is given in Annex D.
7.1.3 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 b).

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, 23MnCrMo5-5-4

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.
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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 regional standard.

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.

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 origi
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