EN ISO 683-17:1999

SLOVENSKI STANDARD
01-november-2000
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Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing
steels (ISO 683-17:1999)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 17: Wälzlagerstähle (ISO 683-17:1999)
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 17:
Aciers pour roulements (ISO 683-17:1999)
Ta slovenski standard je istoveten z: EN ISO 683-17:1999
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.

INTERNATIONAL ISO
STANDARD 683-17
Second edition
1999-10-15
Heat-treated steels, alloy steels
and free-cutting steels —
Part 17:
Ball and roller bearing steels
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage —
Partie 17: Aciers pour roulements
A
Reference number
ISO 683-17:1999(E)
ISO 683-17:1999(E)
Contents
Page
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Ordering and designation .2
5 Requirements.3
6 Inspection, testing and conformance of products .5
7 Marking .6
Annex A (normative) Supplementary or special requirements .15
Annex B (informative) Content of microscopic non-metallic inclusions.17
Annex C (informative) Designations of comparable steels.19
Bibliography.20
©  ISO 1999
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO 683-17:1999(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 3.
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.
International Standard ISO 683-17 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4,
Heat treatable and alloy steels. This second edition cancels and replaces the first edition (ISO 683-17:1976), which
has been technically revised.
ISO 683 consists of the following parts, under the general title Heat treated steels, alloy steels and free-cutting
steels:
 Part 1: Direct-hardening unalloyed and low-alloyed wrought steels in form of different black products
 Part 9: Wrought free-cutting steels
 Part 10: Wrought nitriding steels
 Part 11: Wrought 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
Annex A forms a normative part of this part of ISO 683. Annexes B and C are for information only.
iii
©
INTERNATIONAL STANDARD  ISO ISO 683-17:1999(E)
Heat-treated steels, alloy steels and free-cutting steels —
Part 17:
Ball and roller bearing steels
1 Scope
1.1  This part of ISO 683 applies to the products and heat-treatment conditions given in Table 1 and the surface
conditions given in Table 2.
1.2  This part of ISO 683 gives the technical delivery requirements for five groups of wrought ball and roller bearing
steels as listed in Table 3, namely:
a) through-hardening bearing steels (steels with about 1 % C and 1 % to 2 % Cr);
b) case-hardening bearing steels;
c) induction-hardening bearing steels (unalloyed and alloyed);
d) stainless bearing steels;
e) high temperature bearing steels.
In special cases variations in these technical delivery requirements or additions to them may form the subject
1.3
of an agreement at the time of inquiry and order (see annex A).
In addition to this part of ISO 683, the general technical delivery requirements of ISO 404 are applicable.
1.4
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 683. For dated references, subsequent amendments to, or revisions of, any of these publications do
not apply. However, parties to agreements based on this part of ISO 683 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 377:1997, Steel and steel products — Location and preparation of samples and test pieces for mechanical
testing.
ISO 404:1992, Steel and steel products — General technical delivery requirements.
ISO 642:1999, Steels — Hardenability test by end quenching (Jominy test).
ISO 643:1983, Steels — Micrographic determination of the ferritic or austenitic grain size.
ISO 1035-1:1980, Hot-rolled steel bars — Part 1: Dimensions of round bars.
ISO 1035-4:1982, Hot-rolled steel bars — Part 4: Tolerances.
ISO 3763:1976, Wrought steels — Macroscopic methods for assessing the content of non-metallic inclusions.
ISO 3887:1976, Steel, non-alloy and low-alloy — Determination of depth of decarburization.
© ISO
ISO 683-17:1999(E)
ISO 4948-1:1982,
Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based on
chemical composition.
ISO 4967:1998, Steel — Determination of content of nonmetallic inclusions — Micrographic method using standard
diagrams.
ISO 4969:1980, Steel — Macroscopic examination by etching with strong mineral acids.
ISO 5949:1983, Tool steels and bearing steels — Micrographic method for assessing the distribution of carbides
using reference photomicrographs.
1)
ISO 6506:1981 , Metallic materials — Hardness test — Brinell test.
ISO 6929:1987, Steel products — Definitions and classification.
ISO 9443:1991, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire rods —
Technical delivery conditions.
ISO/TR 9769:1991, Steel and iron — Review of available methods of analysis.
ISO 10474:1991, Steel and steel products — Inspection documents.
ISO 14284:1996, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition.
ENV 10247:1996, Metallographic test methods — Examination of steels using standard diagrams to assess the
content of non-metallic inclusions.
3 Terms and definitions
For the purposes of this part of ISO 683, the terms and definitions for the product forms given in ISO 6929 apply.
The terms "unalloyed steel" and "alloyed steel" are as defined in ISO 4948-1.
4 Ordering and designation
The designation of the product on an order shall cover the following.
a) The designation of the product form (e. g. bar) followed by
1) either the designation of the dimensional standard and the dimensions and tolerances selected from it
(see 5.6) or
2) the designation of any other document covering the dimensions and tolerances required for the product.
b) If a surface condition other than "hot worked" or a special surface quality is required
1) the surface condition (see Table 2), and
2) the surface quality (see 5.5).
c) A description of the steel comprising
1) a reference to this part of ISO 683;
2) the designation of the steel type (see Table 3);
3) the symbol for the heat-treatment condition on delivery (see Table 1);
4) the standard designation for the required type of inspection document (see ISO 10474);
5) the symbol and, where necessary, the details of this supplementary requirement (see annex A), if any
supplementary requirement shall be complied with.

1)
This International Standard has been replaced by ISO 6506-1, ISO 6506-2 and ISO 6506-3.
© ISO
ISO 683-17:1999(E)
EXAMPLE
The following are to be ordered.
Hot-rolled round bars
a) in accordance with ISO 1035-1;
b) with a nominal diameter of 50,0 mm;
c) with a nominal length of 8 000 mm;
d) with a tolerance on diameter of 6 0,40 mm (class S of ISO 1035-4);
+100
e) with a tolerance on length of mm (class L2 of ISO 1035-4);
f) all other tolerances as given in ISO 1035-4, for normal cases.
Surface
a) as hot worked
Steel
a) in accordance with this part of ISO 683, type 100Cr6 (see Table 3);
b) heat-treatment condition: annealed to achieve spheroidized carbides (symbol 1AC, see Table 1);
c) with an inspection certificate 3.1.B (see ISO 10474).
Designation
Rounds ISO 1035-1-50,0 S 3 8 000 L2
Steel ISO 683-17-100Cr61AC-3.1.B
5 Requirements
5.1 Manufacturing process
5.1.1 General
The manufacturing process of the steel and of the products is, with the restrictions given by the requirements in
5.1.2 and 5.1.3, left to the discretion of the manufacturer.
When he so requests, the purchaser shall be informed on the steel-making process used.
Remelting of the steel may be agreed upon at the time of enquiry and order.
5.1.2 Heat-treatment and surface condition at delivery
The heat-treatment and surface condition at delivery shall be as agreed when ordering.
Table 1 in combination with Table 6 covers the various product forms' and steel groups' usual heat-treatment
conditions, and Table 2 the usual surface conditions.
5.1.3 Cast separation
The steels shall be delivered separated by casts.
© ISO
ISO 683-17:1999(E)
5.2 Chemical composition, hardness and hardenability
Table 1 gives a survey on combinations of usual heat-treatment conditions at delivery, product forms and
5.2.1
requirements according to Tables 3 to 6 (chemical composition, hardenability, maximum hardness, hardness
range).
5.2.2  Where the steel is not ordered to hardenability requirements – i.e. where the steel type designations of
Table 3 and not the designations given in Table 5 are applied – the requirements for chemical composition and
hardness cited in Table 1, column 10, apply as appropriate for the particular heat-treatment condition. In this case
the values of hardenability given in Table 5 are for guidance purposes only.
5.2.3  Where the steel is, by using the designations given in Table 5, ordered to hardenability requirements, the
values of hardenability given in Table 5 apply in addition to the requirements cited in Table 1, column 10 (see
footnote b to Table 3).
5.3 Microstructure
5.3.1 Austenitic grain size of case-hardening and induction-hardening bearing steels
Case-hardening steels and induction-hardening steels shall be fine grained. This requirement shall be regarded as
complied with if
a) in the case of case-hardening steels after holding the steel for 4 h at (925 6 10) °C, at least 70 % of the
microstructure revealed according to one of the procedures given in ISO 643 consists of grains of size 5 or
finer;
b) in the case of induction hardening steels after holding for 1,5 h at (850 6 10) °C the microstructure revealed
according to one of the procedures given in ISO 643 consists of grains of size 5 or finer.
For verification of the grain size see annex A.1.
5.3.2 Spheroidization and distribution of carbides
5.3.2.1  For deliveries in treatment conditions 1AC and 1AC1C, the carbides of the through-hardening steels shall
be spheroidized and the carbides of the stainless and high temperature bearing steels shall be predominantly
spheroidized. Case-hardening steels may show remnants of incompletely spheroidized carbides. If necessary, the
required degree of spheroidization shall be agreed at the time of enquiry and order.
5.3.2.2  For distribution of carbides, see annex A.2
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