EN ISO 683-2:2018

SLOVENSKI STANDARD
01-september-2018
1DGRPHãþD
SIST EN 10083-1:2006
SIST EN 10083-3:2006
SIST EN 10083-3:2006/AC:2008
Toplotno obdelana, legirana in avtomatna jekla - 2. del: Legirana jekla za
poboljšanje (ISO 683-2:2016)
Heat treatable steels, alloy steels and free-cutting steels - Part 2: Alloy steels for
quenching and tempering (ISO 683-2:2016)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 2: Legierte Vergütungsstähle (ISO 683-2:2016)
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 2:
Aciers alliés pour trempe et revenue (ISO 683-2:2016)
Ta slovenski standard je istoveten z: EN ISO 683-2:2018
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.20 Visokokakovostna jekla Stainless steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 683-2
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2018
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.20; 77.140.45 Supersedes EN 10083-1:2006, EN 10083-3:2006
English Version
Heat-treatable steels, alloy steels and free-cutting steels -
Part 2: Alloy steels for quenching and tempering (ISO 683-
2:2016)
Aciers pour traitement thermique, aciers alliés et Für eine Wärmebehandlung bestimmte Stähle, legierte
aciers pour décolletage - Partie 2: Aciers alliés pour Stähle und Automatenstähle - Teil 2: Legierte
trempe et revenu (ISO 683-2:2016) Vergütungsstähle (ISO 683-2:2016)
This European Standard was approved by CEN on 18 May 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 683-2:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
European foreword
The text of ISO 683-2:2016 has been prepared by Technical Committee ISO/TC 17 “Steel” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 683-2:2018 by
Technical Committee ECISS/TC 105 “Steels for heat treatment, alloy steels, free-cutting steels and
stainless steels” the secretariat of which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by December 2018, and conflicting national standards
shall be withdrawn at the latest by December 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 10083-1:2006, EN 10083-3:2006.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 683-2:2016 has been approved by CEN as EN ISO 683-2:2018 without any modification.

The European steel numbers to the steel grades are to be found in informative Annex C.
The references to following European standards are given for information:
EN 10017, Steel rod for drawing and/or cold rolling - Dimensions and tolerances
EN 10021, General technical delivery conditions for steel products
EN 10029, Hot-rolled steel plates 3 mm thick or above - Tolerances on dimensions and shape
EN 10048, Hot rolled narrow steel strip - Tolerances on dimensions and shape
EN 10051, Continuously hot-rolled strip and plate/sheet cut from wide strip of non-alloy and alloy steels -
Tolerances on dimensions and shape
EN 10058, Hot rolled flat steel bars for general purposes - Dimensions and tolerances on shape and
dimensions
EN 10059, Hot rolled square steel bars for general purposes - Dimensions and tolerances on shape and
dimensions
EN 10060, Hot rolled round steel bars for general purposes - Dimensions and tolerances on shape and
dimensions
EN 10061, Hot rolled hexagon steel bars for general purposes - Dimensions and tolerances on shape and
dimensions
EN 10108, Round steel rod for cold heading and cold extrusion - Dimensions and tolerances
EN 10160, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection
method)
EN 10204, Metallic products - Types of inspection documents
EN 10308, Non destructive testing - Ultrasonic testing of steel bars

INTERNATIONAL ISO
STANDARD 683-2
Second edition
2016-07-01
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 683-2:2016(E)
©
ISO 2016
ISO 683-2:2016(E)
© 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.
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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

ISO 683-2:2016(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 Heat-treatment condition . 4
6.3.2 Particular surface conditions . 4
6.4 Traceability of the cast . 4
7 Requirements . 5
7.1 Chemical composition, mechanical properties and hardenability . 5
7.1.1 General. 5
7.1.2 Chemical composition . 5
7.1.3 Mechanical properties . 5
7.1.4 Hardenability . 5
7.1.5 Surface hardness . 5
7.2 Machinability . 5
7.3 Cold shearability . 5
7.4 Grain size . 6
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 quality . 6
7.8 Decarburization . 7
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 . 8
8.3.1 Verification of the hardenability, hardness and mechanical properties . 8
8.3.2 Visual and dimensional inspection . 8
9 Test methods . 8
9.1 Chemical analysis . 8
9.2 Mechanical tests . 8
9.2.1 Tensile test . 8
9.2.2 Impact test . 8
9.3 Hardness and hardenability tests . 8
9.3.1 Hardness in treatment conditions +A and +S . 8
9.3.2 Verification of hardenability . 9
9.3.3 Surface hardness . 9
9.4 Retests . 9
ISO 683-2:2016(E)
10 Marking . 9
Annex A (normative) Ruling sections for mechanical properties .31
Annex B (normative) Supplementary or special requirements .35
Annex C (informative) Designation of steels given in this part of ISO 683 and of comparable
grades covered in various designation systems.37
Annex D (informative) Dimensional standards applicable to products complying with this
part of ISO 683 .39
Bibliography .40
iv © ISO 2016 – All rights reserved

ISO 683-2:2016(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 683-2:2012), 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
INTERNATIONAL STANDARD ISO 683-2:2016(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 2:
Alloy steels for quenching and tempering
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 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.
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 B).
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 for 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 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method
ISO 683-2:2016(E)
ISO 377, Steel and steel products — Location and preparation of samples and test pieces for mechanical testing
ISO 404:2013, 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
1)
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 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 definitions in 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 of Clause 1.
3.1
ruling section
section for which the specified mechanical properties shall apply
Note 1 to entry: 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 will show the same cooling rate as the actual ruling section of the product concerned at its
position for taking the test pieces, when being cooled from austenitizing temperature.
1) Under preparation. Stage at the time of publication: ISO/DIS 4885:2016.
2 © ISO 2016 – All rights reserved

ISO 683-2:2016(E)
3.2
austempering
isothermal heat treatment for producing bainitic or ausferritic structure of a work piece
Note 1 to entry: The final cooling to ambient temperature is not at a specific rate.
2)
[SOURCE: ISO 4885:— , 3.11]
3.3
alloy steel
as defined in ISO 4948-1:1982, 3.1.3
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) quantity to be delivered;
b) 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
Several options are specified in this part of ISO 683 and listed below. If the purchaser does not indicate
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);
2) Under preparation. Stage at the time of publication: ISO/DIS 4885:2016.
ISO 683-2:2016(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).
5.3 Ordering example
EXAMPLE Fifty 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), product analysis/option B.4 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.4
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).
4 © ISO 2016 – All rights reserved

ISO 683-2:2016(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.
ISO 683-2:2016(E)
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.
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 shall be delivered with surface class 1za2 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.
6 © ISO 2016 – All rights reserved

ISO 683-2:2016(E)
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.
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.
ISO 683-2:2016(E)
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, subcolumn 8.2, shall, with the following exception, be verified.
The requirements given in footnote of Table 1 (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.
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.
eH
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 concerning the impact energy and the
verification at temperatures other than room temperature (0 °C, –20 °C and –40 °C) can be agreed.
NOTE Impact values at lower temperatures cannot be achieved for all steel grades.
The average values of a set of three test pieces shall be equal to or greater than the specified value. One
individual value may be below the specified value, provided it is not less than 70 % of that value.
If these conditions are not satisfied, additional tests can be done according to ISO 404:2013, 8.3.4.2.
9.3 Hardness and hardenability tests
9.3.1 Hardness in treatment conditions +A and +S
For products in treatment conditions +A (soft annealed) and +S (treated to improve shearability), the
hardness shall be measured in accordance with ISO 6506-1.
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ISO 683-2:2016(E)
9.3.2 Verification of hardenability
Whenever available, the manufacturer has the option to verify the hardenability by calculation. The
calculation method is left to the discretion of the manufacturer. If agreed at the time of enquiry and
order, the manufacturer shall give sufficient information about the calculation for the customer to
confirm the result.
If a calculation formula is not available or in the case of dispute, an end quench hardenability test
shall be carried out in accordance with ISO 642. The temperature for quenching shall comply with the
relevant tables in this part of ISO 683. The hardness values shall be determined in accordance with
ISO 6508-1, scale C.
9.3.3 Surface hardness
The surface hardness of steels after flame and induction hardening (see Table 9) shall be determined in
accordance with ISO 6508-1, scale C.
9.4 Retests
Retests for steels for quenching and tempering and criteria are specified in ISO 404.
10 Marking
The manufacturer shall mark the products or the bundles or boxes containing the products in a suitable
way, so that the identification of the cast, the steel type and the origin of the delivery is possible
(see B.6).
ISO 683-2:2016(E)
Table 1 — Combinations of usual heat-treatment conditions at delivery, product forms and
requirements according to Tables 3 to 9
No. 1 2 3 4 5 6 7 8 9
Applicable requirements if the steel is ordered
x indicates applicable to
with the designation given in
Heat-
treat- Table 3 Table 5 or 6
Ham-
ment
Semi-
1 Symbol
Flat mer
condition
finished Wire
Bars prod- and
at
prod- rod
8.1 8.2 9.1 9.2 9.3
ucts drop
delivery
ucts
forgings
none
a
2 Untreated x x x x x —
or +U
Harden-
Treated to
ability
Table 7
improve
values
3 +S x x — — — column
sheara-
accord-
a
Maximum +
...