EN ISO 4957:1999
(Main)Tool steels (ISO 4957:1999)
Tool steels (ISO 4957:1999)
This international standard covers the grades of wrought tool steels listed in tables 2, 4, 6 and 8, namely: a) unalloyed cold-work tool steels (see table 2); b) alloyed cold-work tool steels (see table 4); c) alloyed hot-work tool steels (see table 6); d) high-speed steels (see table 8). If not stated in the following, this international standard applies to all types of hot-rolled, forged or cold-drawn products which are supplied in one of the surface and heat-treatment conditions given in 5.1.2 and table 1.
Werkzeugstähle (ISO 4957:1999)
Diese Internationale Norm gilt für die folgenden Sorten aus Werkzeugstahl: a) unlegierte Kaltarbeitsstähle; b) legierte Kaltarbeitsstähle; c) legierte Warmarbeitsstähle; d) Schnellarbeitsstähle; Soweit nicht anders angegeben, gilt diese Internationale Norm für alle Arten warmgewalzter, geschmiedeter, kaltgezogener oder kaltgewalzter Erzeugnisse, die in einem der in 4.1.2 und Tabelle 1 aufgeführten Oberflächen- und Wärmebehandlungßustände geliefert werden. Erzeugnisse nach dieser Internationalen Norm dürfen auch pulver- metallurgisch hergestellt werden.
Aciers à outils (ISO 4957:1999)
La présente Norme internationale spécifie les nuances des aciers à outils corroyés, à savoir:a) aciers à outils non alliés pour travail à froid;b) aciers à outils alliés pour travail à froid;c) aciers à outils alliés pour travail à chaud;d) aciers rapides.Sauf spécification contraire, la présente Norme internationale s'applique à tous les types de produits laminés à chaud ou à froid, forgés, ou étirés à froid et qui possèdent à la livraison l'un des états de surface et de traitement thermique spécifiés en 4.1.2 et dans le Tableau 1.Les produits mentionnés dans la présente Norme internationale peuvent être produits par la métallurgie des poudres.NOTE 1 Les Tableaux 2, 4, 6 et 8 ne prennent en compte que les aciers qui ont acquis une certaine renommée internationale, ce qui ne signifie pas toutefois qu'ils soient disponibles dans tous les pays industriels. De plus, un certain nombre d'autres aciers à outils sont décrits dans des normes régionales, nationales ou d'entreprises.NOTE 2 Lorsque la résistance à la chaleur des outils est un facteur d'une importance particulière, comme par exemple dans le cas des outils pour le façonnage à chaud du verre, il convient de baser le choix du matériau sur l'ISO 4955 ou l'ISO 9722.En complément de la présente Norme internationale, les conditions techniques générales de livraison définies dans l'ISO 404 sont applicables.
Orodna jekla (ISO 4957:1999)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2000
Orodna jekla (ISO 4957:1999)
Tool steels (ISO 4957:1999)
Werkzeugstähle (ISO 4957:1999)
Aciers a outils (ISO 4957:1999)
Ta slovenski standard je istoveten z: EN ISO 4957:1999
ICS:
77.140.35 Orodna jekla Tool steels
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
INTERNATIONAL ISO
STANDARD 4957
Second edition
1999-12-15
Tool steels
Aciers à outils
Reference number
ISO 4957:1999(E)
©
ISO 1999
ISO 4957:1999(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not
be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this
file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this
area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters
were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event
that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© 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 either ISO at the address below or ISO's member body
in the country of the requester.
ISO copyright office
Case postale 56 � CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 734 10 79
E-mail copyright@iso.ch
Web www.iso.ch
Printed in Switzerland
ii © ISO 1999 – All rights reserved
ISO 4957:1999(E)
Contents
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Requirements.3
5 Inspection, testing and conformance of products.4
6 Marking .5
7 Ordering and designation .5
Annex A (informative) Hardness-tempering temperature-curves .18
Annex B (normative) Supplementary or special requirements .28
Annex C (informative) Designations of comparable steels.30
Bibliography.32
© ISO 1999 – All rights reserved iii
ISO 4957:1999(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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 4957 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 4957:1980) which has been technically revised.
Annex B forms a normative part of this International Standard, annexes A and C are for information only.
iv © ISO 1999 – All rights reserved
INTERNATIONAL STANDARD ISO 4957:1999(E)
Tool steels
1 Scope
1.1 This International Standard covers the following grades of wrought tool steels:
a) non-alloy cold-work tool steels;
b) alloy cold-work tool steels;
c) alloy hot-work tool steels;
d) high-speed tool steels.
If not stated otherwise, this International Standard applies to all types of hot-rolled, forged, cold-drawn or cold-rolled
products which are supplied in one of the surface and heat-treatment conditions given in 4.1.2 and Table 1.
Products according to this International Standard may be produced by powder metallurgy.
NOTE 1 The Tables 2, 4, 6 and 8 cover only those steels which have gained certain international importance, which does not
mean however, that they are available in all industrial countries. In addition, a number of other steels for tools are specified in
regional, national or company standards.
NOTE 2 Where the heat resistance of the tools is of particular importance, as for example in the case of tools for hot forming
glass, the material selection should be based on ISO 4955 or ISO 9722.
1.2 In addition to this International Standard, the general technical delivery requirements of ISO 404 are
applicable.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard 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 1035-1:1980, Hot-rolled steel bars — Part 1: Dimensions of round bars.
ISO 1035-3:1980, Hot-rolled steel bars — Part 3: Dimensions of flat bars.
ISO 1035-4:1982, Hot-rolled steel bars — Part 4: Tolerances.
© ISO 1999 – All rights reserved 1
ISO 4957:1999(E)
ISO 4948-1:1982, Steels — Classification — Part 1: Classification of steels into unalloyed and alloy steels based
on chemical composition.
1)
ISO 6506:1981 , Metallic materials — Hardness test — Brinell test.
2)
ISO 6508:1986 ,Metallic materials— Hardness test—Rockwelltest(scalesA-B-C-D-E-F-G-H-K).
ISO 6929:1987, Steel products — Definitions and classification.
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.
3 Terms and definitions
For the purposes of this International Standard, the terms and definitions given in ISO 4948-1 and ISO 6829 as well
as the following apply.
3.1
product forms
[ISO 6929]
3.2
unalloyed and alloyed steel
[ISO 4948-1]
3.3
tool steels
special steels suitable for working or processing of materials, for handling and measuring workpieces and, for this
purpose, exhibiting high hardness and wear resistance and/or toughness
3.3.1
cold-work tool steels
non-alloy or alloy tool steels for applications in which the surface temperature is generally below 200 °C
3.3.2
hot-work tool steels
alloy tool steels for applications in which the surface temperature is generally over 200 °C
3.3.3
high-speed tool steels
steels used mainly for machining and for forming processes and which, because of their chemical composition,
have the highest high-temperature hardness and temper resistance up to about 600 °C
1) To be replaced by ISO 6506-1, ISO 6506-2 and ISO 6506-3.
2) To be replaced by ISO 6508-1, ISO 6508-2 and ISO 6508-3.
2 © ISO 1999 – All rights reserved
ISO 4957:1999(E)
4 Requirements
4.1 Manufacturing process
4.1.1 General
The manufacturing process of the steel and the products is left to the discretion of the manufacturer, with the
restrictions given in 4.1.2.
When he so requests, the purchaser shall be informed what steel making process is being used.
4.1.2 Heat-treatment condition and surface condition on delivery
The heat-treatment and surface conditions of the products shall comply with the agreements when ordering.
4.1.2.1 Heat-treatment condition
The heat-treatment conditions are given in Table 1.
Unless otherwise specified in the order, the tool steels (except C45U, Table 2, 35CrMo7, X38CrMo16 and
40CrMnNiMo8-6-4, Table 4, 55NiCrMoV7, Table 6) are delivered in the annealed condition.
4.1.2.2 Surface condition
Usual surface conditions are:
a) the hot-rolled or forged condition ( = as hot worked);
b) the machined (ground, polished, turned, peeled or milled) condition;
c) the cold-reduced condition.
4.2 Chemical composition and mechanical properties
4.2.1 Table 1 gives a survey of combinations of usual heat-treatment conditions at delivery and requirements
according to Tables 2 to 9 (chemical composition, hardness).
4.2.2 For hardness-tempering temperature-curves of the steels see annex A.
4.2.3 For hardness penetration depth of non-alloy cold-work tool steels, see Table 2, footnote d.
4.3 Surface quality
4.3.1 All products shall have a workmanlike finish and shall be clean and free from surface imperfections likely to
have an adverse effect on their processing or designated application.
4.3.2 Ground, polished or finished-machined products shall be free from surface imperfections and surface
decarburization.
4.3.3 Hot-rolled, forged, cold-drawn or rough-machined products shall be ordered with sufficient material to be
removed from all surfaces by machining or grinding to allow for
a) surface decarburization and
b) surface imperfections.
© ISO 1999 – All rights reserved 3
ISO 4957:1999(E)
As long as no International Standard for the machining allowances of tool steels is available, the allowances shall
be agreed at the time of enquiry and order.
4.4 Shape, dimensions and tolerances
The shape, dimensions and tolerances of the products shall comply with the requirements agreed upon at the time
of enquiry and order. The agreements shall, as far as possible, be based on corresponding International Standards
or otherwise, on suitable national standards.
For rolled flat and round bars, the following International Standards cover dimensions and/or tolerances for
products included in this International Standard: ISO 1035-1, ISO 1035-3 and ISO 1035-4.
NOTE By agreement, the tolerances can be all plus or other disposition than equal plus/minus.
5 Inspection, testing and conformance of products
5.1 Inspection and testing procedures and types of inspection documents
5.1.1 For each delivery, the issue of any inspection document in accordance with ISO 10474 may be agreed
upon at the time of enquiry and order.
5.1.2 If, in accordance with the agreements made at the time of enquiry and order, a test report is to be provided,
this shall cover:
a) the statement that the material complies with the requirements of the order;
b) the results of the cast analysis for all elements specified for the type of steel supplied.
5.1.3 If, in accordance with the agreements in the order, an inspection certificate 3.1.A, 3.1.B or 3.1.C or an
inspection report 3.2 (see ISO 10474) is to be provided, the specific inspections and tests described in 5.2 shall be
carried out and their results shall be certified in the document.
In addition the document shall cover
a) the results of the cast analysis provided by the manufacturer for all elements specified for the steel type
concerned;
b) the results of all inspections and tests ordered by supplementary requirements (see annex B);
c) the symbol letters of numbers connecting the inspection documents, the test pieces and products to each
other.
5.2 Specific inspection and testing
5.2.1 Number of sample products
5.2.1.1 Chemical composition
The cast analysis is given by the manufacturer. For product analysis see B.2 in annex B.
5.2.1.2 Mechanical properties
One sample product per test unit shall be tested.
5.2.1.2.1 For material delivered in the annealed or annealed and cold rolled or annealed and cold drawn
condition, the test unit shall consist of products from the same cast and the same heat-treatment batch.
4 © ISO 1999 – All rights reserved
ISO 4957:1999(E)
In the case of material heat treated in a continuous furnace, a heat-treatment batch is regarded as that quantity of
products (of the same cast and dimensions) which without any in
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.