SIST EN ISO 683-4:2018

SLOVENSKI STANDARD
SIST EN ISO 683-4:2018
01-september-2018
1DGRPHãþD
SIST EN 10087:2000
Toplotno obdelana, legirana in avtomatna jekla - 4. del: Avtomatna jekla (ISO 683-
4:2016)
Heat treatable steels, alloy steels and free-cutting steels - Part 4: Free-cutting steels
(ISO 683-4:2016)
Für eine Wärmebehandlung bestimmte Stähle, legierte Stähle und Automatenstähle -
Teil 4: Automatenstähle (ISO 683-4:2016)
Aciers pour traitement thermique, aciers alliés et aciers pour décolletage - Partie 4:
Aciers pour décolletage (ISO 683-4:2016)
Ta slovenski standard je istoveten z: EN ISO 683-4:2018
ICS:
77.140.10 Jekla za toplotno obdelavo Heat-treatable steels
77.140.20 Visokokakovostna jekla Stainless steels
SIST EN ISO 683-4:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 683-4:2018

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SIST EN ISO 683-4:2018


EN ISO 683-4
EUROPEAN STANDARD

NORME EUROPÉENNE

June 2018
EUROPÄISCHE NORM
ICS 77.140.10; 77.140.20 Supersedes EN 10087:1998
English Version

Heat-treatable steels, alloy steels and free-cutting steels -
Part 4: Free-cutting steels (ISO 683-4:2016)
Aciers pour traitement thermique, aciers alliés et Für eine Wärmebehandlung bestimmte Stähle, legierte
aciers pour décolletage - Partie 4: Aciers pour Stähle und Automatenstähle - Teil 4: Automatenstähle
décolletage (ISO 683-4:2016) (ISO 683-4:2016)
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 683-4:2018 E
worldwide for CEN national Members.

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SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)
Contents Page
European foreword . 3

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SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)
European foreword
The text of ISO 683-4:2016 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 683-4:2018 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 10087:1998.
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 683-4:2016 has been approved by CEN as EN ISO 683-4:2018 without any modification.

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SIST EN ISO 683-4:2018
EN ISO 683-4:2018 (E)
The European steel numbers to the steel grades are to be found in informative Annex C. Some European
steel numbers were not available at the publication of this International standard, for this reason they
are given now below.

Steel 9S20 17SMn20 35SMn20 35SMnPb20
name
Steel 1.0721 1.0735 1.0766 1.0767
number

The references to following European standards are given for information:
EN 10017, Steels rod for drawing and/or cold rolling – Dimensions and tolerances
EN 10021, General technical delivery conditions for steel products
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 - Dimensions and tolerances on shape and dimensions
EN 10061, Hot rolled hexagon steel bars – Dimensions and tolerances on shape and dimensions
EN 10204, Metallic products – Types of inspection documents
EN 10308, Non-destructive testing – Ultrasonic testing of steel bars

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SIST EN ISO 683-4:2018
INTERNATIONAL ISO
STANDARD 683-4
Second edition
2016-07-15
Heat-treatable steels, alloy steels and
free-cutting steels —
Part 4:
Free-cutting steels
Aciers pour traitement thermique, aciers alliés et aciers pour
décolletage —
Partie 4: Aciers pour décolletage
Reference number
ISO 683-4:2016(E)
©
ISO 2016

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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification and designation . 2
4.1 Classification . 2
4.2 Designation . 2
5 Information to be supplied by the purchaser. 2
5.1 Mandatory information . 2
5.2 Options/supplementary or special requirements. 3
5.3 Ordering example . 3
6 Manufacturing process . 3
6.1 General . 3
6.2 Heat treatment and surface condition at delivery . 3
6.2.1 Normal condition at delivery . 3
6.2.2 Particular heat-treatment condition . . 3
6.3 Traceability of the cast . 3
7 Requirements . 4
7.1 Chemical composition, hardness, and mechanical properties . 4
7.1.1 General. 4
7.1.2 Chemical composition . 4
7.1.3 Mechanical properties . 4
7.2 Machinability . 4
7.3 Weldability . 4
7.4 Grain size . 4
7.5 Internal soundness . 4
7.6 Surface quality . 5
7.7 Shape, dimensions, and tolerances . 5
8 Inspection . 5
8.1 Testing procedures and types of documents . 5
8.2 Frequency of testing . 6
8.3 Specific inspection and testing . 6
8.3.1 Verification of the hardness and mechanical properties . 6
8.3.2 Visual and dimensional inspection . 6
9 Test methods . 6
9.1 Chemical analysis . 6
9.2 Hardness and mechanical tests . 6
9.2.1 Hardness . 6
9.2.2 Mechanical tests . 6
9.3 Retests . 6
10 Marking . 7
Annex A (normative) Ruling sections for mechanical properties .14
Annex B (normative) Supplementary or special requirements .17
Annex C (informative) Designation of steels given in this part of ISO 683 and of comparable
grades covered in various designation systems.19
Annex D (informative) Dimensional standards applicable to products complying with this
part of ISO 683 .20
Bibliography .21
© ISO 2016 – All rights reserved iii

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SIST EN ISO 683-4:2018
ISO 683-4:2016(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 683-4:2014), of which it constitutes a
minor revision.
ISO 683 consists of the following parts, under the general title Heat-treatable steels, alloy steels and free-
cutting steels:
— Part 1: Non-alloy steels for quenching and tempering
— Part 2: Alloy steels for quenching and tempering
— Part 3: Case-hardening steels
— Part 4: Free-cutting steels
— Part 5: Nitriding steels
— Part 14: Hot-rolled steels for quenched and tempered springs
— Part 15: Valve steels for internal combustion engines
— Part 17: Ball and roller bearing steels
— Part 18: Bright steel products
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SIST EN ISO 683-4:2018
INTERNATIONAL STANDARD ISO 683-4:2016(E)
Heat-treatable steels, alloy steels and free-cutting steels —
Part 4:
Free-cutting steels
1 Scope
This part of ISO 683 gives the technical delivery requirements for semi-finished products (e.g. blooms,
billets, slabs), bars and wire rod, manufactured from the free-cutting steels listed in Table 2 and supplied
in one of the treatment conditions given for the different types of products in Table 1, rows 2 to 4.
This part of ISO 683 covers three groups of free-cutting steels for mechanical purposes as listed in
Table 2, namely
a) not intended for heat treatment,
b) suitable for case-hardening, and
c) suitable for quenching and tempering.
Free-cutting steels are often used as bright bars. For these products, refer to ISO 683-18.
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 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 643, Steels — Micrographic determination of the apparent grain size
ISO 4885, Ferrous products — Heat treatments — Vocabulary
ISO 4948-1, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based
on chemical composition
ISO 4948-2, Steels — Classification — Part 2: Classification of unalloyed and alloy steels according to main
quality classes and main property or application characteristics
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6892-1, Metallic materials — Tensile testing — Part 1: Method of test at room temperature
ISO 6929, Steel products — Vocabulary
ISO 9443, Heat-treatable and alloy steels — Surface quality classes for hot-rolled round bars and wire
rods — Technical delivery conditions
© ISO 2016 – All rights reserved 1

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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

ISO 10474, Steel and steel products — Inspection documents
ISO 14284, Steel and iron — Sampling and preparation of samples for the determination of chemical
composition
ISO/TR 9769, Steel and iron — Review of available methods of analysis
ISO/TS 4949, Steel names based on letter symbols
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 377, ISO 4885, ISO 4948-1,
ISO 4948-2, ISO 6929, ISO 14284 and the following apply.
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.
3.2
free-cutting steels
steels characterized by good machinability with high metal removal rate, mostly obtained by higher
than normal contents of sulphur
Note 1 to entry: Other elements besides sulfur can be added for further improving the machinability.
4 Classification and designation
4.1 Classification
The classification of the relevant steel grades is allocated in accordance with ISO 4948-1 and ISO 4948-2.
All steels covered by this part of ISO 683 are classified as non-alloy quality steels.
4.2 Designation
For the steel grades covered by this part of ISO 683, the steel names 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 (e.g. slab, bloom, billet, round bar, wire rod);
c) either the designation of the dimensional standard and the dimensions and tolerances selected from
this (see 7.7) or the designation of the drawing or any other document, covering the dimensions
and tolerances required for the product;
d) a reference to this part of ISO 683, i.e. ISO 683-4;
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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

e) the designation of the steel grade given in Table 2;
f) standard designation for a test report 2.2 or, if required, any other type of inspection document in
accordance with ISO 10474.
5.2 Options/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 specification of this part of ISO 683 (see 5.1).
a) If a heat-treatment condition other than the untreated condition is required, the symbol for this
other condition (see Table 1, column 2).
b) Any supplementary requirement that shall comply with the symbol and, where necessary, the
details of this supplementary requirement (see Annex B).
c) Suitability of bars and rod for bright drawing (see 7.6.4).
d) Any requirement relating to removal of surface defects (see 7.6.5).
5.3 Ordering example
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
ISO 1035-4, class L2, made of steel grade ISO 683-4, 35S20 (see Table 2) in the heat-treatment condition +U (see
Table 1), product analysis/option (see B.5) with a test report 2.2 in accordance with ISO 10474.
50 round bars ISO 1035 – 40,0S × 8 000L2
steel grade ISO 683-4 – 35S20 option B.5
Inspection document ISO 10474 – 2.2
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 and 6.3, left to the discretion of the manufacturer.
For minimum reduction ratio or minimum thickness deformation ratio of rolled and forged products,
see B.6.
6.2 Heat treatment and surface condition at delivery
6.2.1 Normal condition at delivery
Unless otherwise agreed at the time of enquiry and order, the products shall be delivered in the
untreated condition that means “as hot-worked”.
6.2.2 Particular heat-treatment condition
If so agreed at the time of enquiry and order, the products shall be delivered in one of the particular
heat-treatment conditions given in Table 1, rows 3 and 4.
6.3 Traceability of the cast
Each product shall be traceable to the cast (see Clause 10).
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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

7 Requirements
7.1 Chemical composition, hardness, and mechanical properties
7.1.1 General
Table 1 gives a survey of combinations of usual treatment conditions at delivery, product forms, and
requirements according to Tables 2 to 6 (chemical composition, maximum hardness, mechanical
properties).
7.1.2 Chemical composition
The chemical composition determined by cast analysis shall comply with the values in Table 2.
Permissible deviations between the limiting values for cast analysis and the values for product analysis
are given in Table 3.
The product analysis shall be carried out when specified at the time of the enquiry and order (see B.5).
WARNING — Due to hazardous effects to health and environmental problems of Pb, it is
recommended to instead use steels only with sulfur and other innocuous free-cutting element
additions.
7.1.3 Mechanical properties
Mechanical properties for free-cutting steels are given in Tables 4 to 6.
7.2 Machinability
The steels covered by this part of ISO 683 have good machinability and chip-breaking characteristics.
However, the machinability decreases with increasing carbon, silicon and manganese contents, while
cold reduction improves the machinability of the steels not intended for heat treatment and steel 10S20.
NOTE Non-leaded steels with comparable chemical composition generally have identical mechanical
properties, but often lower machinability than leaded steels.
7.3 Weldability
Because of their high sulfur and phosphorus content, free-cutting steels are normally not recommended
for welding.
7.4 Grain size
Unless otherwise agreed at the time of enquiry and order, the grain size shall be left to the discretion of
the manufacturer. If a fine grain structure is required for case-hardening steels or steels for quenching
and tempering, the special requirement in B.3 shall be ordered.
If direct hardening treatment is used for case-hardening steels, a fine grain structure should be ordered.
7.5 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.4).
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SIST EN ISO 683-4:2018
ISO 683-4:2016(E)

7.6 Surface quality
7.6.1 All products shall have a smooth surface finish appropriate to the manufacturing processes
applied.
7.6.2 Minor surface imperfections, which can occur under normal manufacturing conditions, such as
prints originating from rolled-in scale, are not to be regarded as defects.
7.6.3 Bars and wire rod are delivered with surface class 1za2 according to ISO 9443, unless otherwise
agreed at the time of enquiry and order.
It is more difficult to detect and eliminate surface discontinuities in coiled products than in cut lengths.
This should be taken into account when agreements on surface quality are made.
7.6.4 If suitability of bars and rod for bright drawing is required, this shall be agreed at the time of
enquiry and order.
7.6.5 The removal of surface defects by welding is not permitted.
If surface discontinuities are repaired, the method and maximum depth of removal shall be agreed at
the time of enquiry and order.
7.7 Shape, dimensions, and tolerances
The shape, di
...