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

ISO 683-2:2012 specifies the technical delivery requirements for semi-finished products, hot formed (e.g. blooms, billets, slabs), bars, wire rod, finished flat products and hammer or drop forgings manufactured from the direct-hardening alloy steels and the alloy flame and induction hardening 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 quenched and tempered or austempered and flame- or induction-hardened machine parts. The requirements for mechanical properties given in ISO 683-2:2012 are restricted to the sizes given (in Table 8). In addition to ISO 683-2:2012, the general technical delivery requirements of ISO 404 are applicable.

Aciers pour traitement thermique, aciers alliés et aciers pour décolletage

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Status
Replaced
Publication Date
19-Sep-2012
Withdrawal Date
19-Sep-2012
Current Stage
6060 - International Standard published
Start Date
27-Aug-2012
Completion Date
20-Sep-2012
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INTERNATIONAL ISO
STANDARD 683-2
First edition
2012-09-15
Heat-treatable steels, alloy steels and
free-cutting steels —
Part 2:
Alloy steels for quenching and tempering
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 2: Aciers alliés pour trempe et revenu
Reference number
ISO 683-2:2012(E)
ISO 2012
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ISO 683-2:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012

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

electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO’s

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Published in Switzerland
ii © ISO 2012 – All rights reserved
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ISO 683-2:2012(E)
Contents Page

Foreword ............................................................................................................................................................................iv

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

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

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

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

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

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

7 Requirements ....................................................................................................................................................... 5

7.1 Chemical composition, mechanical properties and hardenability ........................................................ 5

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

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

7.4 Grain size ............................................................................................................................................................... 6

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

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

7.7 Surface quality ..................................................................................................................................................... 6

7.8 Decarburization .................................................................................................................................................... 6

7.9 Shape, dimensions and tolerances ................................................................................................................ 7

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

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

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

8.3 Specific inspection and testing ....................................................................................................................... 7

9 Test methods ........................................................................................................................................................ 8

9.1 Chemical analysis ............................................................................................................................................... 8

9.2 Mechanical tests .................................................................................................................................................. 8

9.3 Hardness and hardenability tests ................................................................................................................... 8

9.4 Retests ................................................................................................................................................................... 9

10 Marking ................................................................................................................................................................... 9

Annex A (normative) Ruling sections for mechanical properties .......................................................................34

Annex B (normative) Supplementary or special requirements ............................................................................37

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

covered in various designation systems ....................................................................................................39

Annex D (informative) Dimensional standards applicable to products complying with this part of

ISO 683 .................................................................................................................................................................41

Bibliography .....................................................................................................................................................................42

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ISO 683-2:2012(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 683-2 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and

alloy steels.

This first edition cancels and replaces the first edition of ISO 683-1:1987 and ISO/TR 11637:1997, which have

been technically 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 9: Wrought free-cutting steels
— Part 10: Wrought nitriding steels
— Part 11: Case-hardening 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 products of unalloyed and low alloy steels
iv © ISO 2012 – All rights reserved
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INTERNATIONAL STANDARD ISO 683-2:2012(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 2:
Alloy steels for quenching and tempering
1 Scope
1.1 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 direct hardening alloy steels and the alloy flame- and induction-hardening 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 quenched and tempered or austempered (see 3.2

and Note 2) and flame- or induction-hardened machine parts (see Tables 8 and 9).

The requirements for mechanical properties given in this part of ISO 683 are restricted to the sizes given in the

relevant Table 8.

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

bars are in the following covered under semi-finished products or bars and not under the term “hammer and drop forgings”.

NOTE 2 For the purposes of simplification, the term “quenched and tempered” is, unless otherwise indicated, used in

the following also for the austempered condition.

NOTE 3 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.

NOTE 4 This part of ISO 683 does not apply to bright products and bars and wire rod for cold heading. For such

products, see ISO 683-18 and ISO 4954.

1.2 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 Annex B).

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

2 Normative references

The following referenced documents are indispensable for the application 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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method

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ISO 683-2:2012(E)

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, Steel — Hardenability test by end quenching (Jominy test)
ISO 643, Steels – Micrographic determination of the apparent grain size
ISO 3887, Steels — Determination of depth of decarburization
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 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 (scales A, B, C, D, E, F,

G, H, K, N, T)

ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature

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/TR 9769, Steel and Iron — Review of available methods of analysis
ISO 10474, Metallic 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 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 Notes 1 and 2 to the Scope.

3.1
ruling section
section for which the specified mechanical properties shall apply

NOTE Independent of the actual shape and dimensions of the cross-section of the product, the size of its ruling

section is always given by a diameter. This corresponds to the diameter of an “equivalent round bar”. That is, a round bar

which, at the position of its cross-section specified for taking the test pieces for the mechanical tests, will, when being

cooled from austenitizing temperature, shows the same cooling rate as the actual ruling section of the product concerned

at its position for taking the test pieces.
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ISO 683-2:2012(E)
3.2
austempering

austenitization of a steel with a subsequent cooling to a temperature in the Bainite region and holding at this

temperature until a desired degree of transformation is obtained

NOTE The subsequent cooling to room temperature can be carried out in any manner desired.

3.3
alloy steel
non-alloy steel as defined in ISO 4948-1
3.4
special
special steel as defined in ISO 4948-2
4 Classification and designation
4.1 Classification

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

covered by this part of ISO 683 are alloy special steels.
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 manufacturer shall obtain the following information from the purchaser at the time of enquiry and order:

a) the quantity to be delivered;

b) the designation of the product form (slab, bloom, billet, round bar, wire rod, wide flat, sheet, plate, strip,

forging, etc.);

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

(see 7.9) 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) reference to this part of ISO 683, i.e. ISO 683-2;
e) the designation of the steel grade given in Table 3;
f) the symbol for the required heat-treatment condition (see Table 1, column 2);

g) 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 part of ISO 683 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 another surface condition than “hot worked” or a special surface quality is required, the surface condition

(see Table 2) and the surface quality (see 7.7);
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ISO 683-2:2012(E)

b) any requirement for the hardenability (+H, +HH, +HL) for special steels (see 7.1.4 and Tables 5 to 7);

c) any supplementary requirement that shall be complied with, the symbol and, where necessary, the details

of this supplementary requirement (see Annex B);

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

e) verification of hardenability and, if agreed, the information about calculation of the hardenability (see 9.3.2);

f) any requirement regarding the permissible depth of decarburization (see 7.8);
g) suitability of bars and rod for bright drawing (see 7.7.4);
h) any requirement relating to the removal of surface defects (see 7.7.5).

EXAMPLE 50 hot-rolled round bars according 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 683-2 42CrMo4 (see Table 3) in the heat-treatment condition +S (see Table 1), surface blast

cleaned (+BC) (see Table 2), cast analysis/option B.5 with an inspection certificate 3.1 according to ISO 10474

50 round bars ISO 1035 - 40,0S × 8 000L2
ISO 683-2 - 42CrMo4+S +BC option B.5
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 B.5.

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

The products shall be delivered in one of the heat-treatment conditions given in Table 1, lines 2 to 6 as agreed

during time of enquiry and order.
6.3.2 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
Each product shall be traceable to the cast (see Clause 10).
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ISO 683-2:2012(E)
7 Requirements
7.1 Chemical composition, mechanical properties and hardenability
7.1.1 General

Table 1 shows the combinations of usual heat-treatment conditions at delivery, product forms and requirements,

as specified in Tables 3 to 9.

Except where steels are ordered in the quenched and tempered condition, this part of ISO 683 makes for the

alloyed steels provisions to be supplied with or without hardenability requirements (see Table 1, columns 8 and 9).

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 B.4).

7.1.3 Mechanical properties

Where the steel is ordered without hardenability requirements, the requirements for mechanical properties

specified in Tables 7 or 8 apply as appropriate for the particular heat treatment condition.

In this case, the hardenability values given in Table 5 are for guidance purposes only.

The mechanical property values given in Table 8 apply to test pieces in the quenched and tempered condition,

which have been taken and prepared in accordance with Figure 2 or Figures 3 and 4 (see also footnote a to Table 1).

7.1.4 Hardenability

Where the steel is ordered using the designations given in Table 5 or 6 to normal (see Table 5) or to narrowed

(see Table 6) hardenability requirements, the values of hardenability given in Table 5 or 6, respectively apply in

addition to the requirements cited in Table 1, columns 9.1 and 9.2. (See footnote b to Table 3.)

7.1.5 Surface hardness

For the surface hardness of alloy steels after flame or induction hardening, the specifications in Table 9 apply.

7.2 Machinability

All steels are machinable in the condition “soft annealed”. Where improved machinability is required, grades

with a specified sulfur range and/or with a specific treatment should be ordered to improve machinability (see

also Table 1, line 6).
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 soft annealed (+A) condition.

7.3.2 Steel grades 34Cr4, 37Cr4, 41Cr4, 25CrMo4, 34CrMo4, 42CrMo4 and 41CrNiMo2 with maximum and

specified range S-content, boron-alloy steel grades 33MnCrB5-2 and 39MnCrB6-2 and the corresponding +H,

+HH and +HL grades (see Tables 3 and 5 to 7) are, under suitable conditions, also cold shearable when being

delivered in the condition “treated to improve shearability (+S)” with the hardness requirements given in Table 7.

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ISO 683-2:2012(E)

7.3.3 Under suitable conditions, steel grades 20MnB5, 30MnB5, 39MnB5 and 27MnCrB5-2, and the corresponding

grades with requirements on hardenability (see Table 5), are cold shearable in the untreated condition.

7.4 Grain size

All steels shall have a fine grain structure with an austenite grain size of 5 or finer when tested in accordance

with ISO 643. For verification, see B.2.
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 sulfides.

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 enquiry and order (see B.3).
7.7 Surface quality

7.7.1 All products shall have a smooth surface finish appropriate to the manufacturing process applied.

7.7.2 Minor surface imperfections, which may occur also 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 A according to ISO 9443 and hot-rolled plates and wide

flats are 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.

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 The removal of surface defects 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 Decarburization

Requirements relating to the permissible depth of decarburization may be agreed at the time of enquiry and order.

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ISO 683-2:2012(E)

The depth of decarburization shall be determined in accordance with the micrographic method specified in ISO 3887.

7.9 Shape, dimensions and tolerances

The shape, dimensions and tolerances of the products shall comply with the requirements agreed at the time

of enquiry and order. The agreements shall, as far as possible, be based on corresponding International

Standards (see Annex D); otherwise on suitable national standards.
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 2.2 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.

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:
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 B);

d) the symbol, letters or numbers relating the inspection certificate, 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 the prescriptions of Table 10.
8.3 Specific inspection and testing
8.3.1 Verification of the hardenability, hardness and mechanical properties

For steels being ordered without hardenability requirements, i.e. without the symbol, +H, +HH or +HL in the

designation, the hardness requirements or mechanical properties given for the relevant heat-treatment condition

in Table 1, column 8, subclause 2, shall, with the following exception, be verified. The requirements given in

Table 1, footnote a (mechanical properties of reference test pieces), shall only be verified if supplementary

requirement specified in B.1 is ordered.

For steels being ordered with the symbol +H, +HH or +HL in the designation (see Tables 5 and 6), unless

otherwise agreed, only the hardenability requirements according to Table 5 or 6 are to be verified.

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ISO 683-2:2012(E)
8.3.2 Visual and dimensional inspection

A sufficient number of products shall be inspected to ensure the compliance with the specification.

9 Test methods
9.1 Chemical analysis

The choice of a suitable physical or chemical analytical method for the analysis shall be at the discretion of the

manufacturer. In cases of dispute, the method for product analysis used shall be agreed taking into account the

relevant existing International Standards.

NOTE The list of available International Standards on chemical analysis is given in ISO/TR 9769.

9.2 Mechanical tests
9.2.1 Tensile test
The tensile test shall be carried out in accordance with ISO 6892-1.

For the specified yield strength in the tables on mechanical properties in this part of ISO 683, the upper yield

strength, R , shall be determined.

If a yield phenomenon is not present, the 0,2 % proof strength, R , shall be determined.

p0,2
9.2.2 Impact test
The impact test shall be carried out in accordance with ISO 148-1.
At the time of enquiry and order, additional requirements concer
...

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