1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Tool steelsBS EN ISO 4957:2018National forewordThis British Standard is the UK implementation of EN ISO 4957:2018. It is identical to ISO 4957:2018. It supersedes BS EN ISO 4957:2000, which is withdrawn.The UK participa
2、tion in its preparation was entrusted to Technical Committee ISE/105, Steels for Heat Treatment, Alloy Steels, Free-Cutting Steels and Stainless Steels.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all t
3、he necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 93315 8ICS 77.140.35Compliance with a British Standard cannot confer immunity from legal obligations. This British St
4、andard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 4957:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 4957July 2018ICS 77.140.35 Supersedes EN IS
5、O 4957:1999EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 4957:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN nation
6、al MembersTool steels (ISO 4957:2018)Aciers outils (ISO 4957:2018) Werkzeugsthle (ISO 4957:2018)This European Standard was approved by CEN on 24 June 2018.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the st
7、atus 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, G
8、erman). 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, Croat
9、ia, 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, Turke
10、y and United Kingdom.English VersionEN ISO 4957:2018 (E)European forewordThis document (EN ISO 4957:2018) has been prepared by Technical Committee ISO/TC 17 “Steel“ in collaboration with Technical Committee ECISS/TC 105 “Steels for heat treatment, alloy steels, free-cutting steels and stainless stee
11、ls” 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 January 2019, and conflicting national standards shall be withdrawn at the latest by January 2019.Attent
12、ion 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 ISO 4957:1999.According to the CEN-CENELEC Internal Regulations, the national st
13、andards 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,
14、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 4957:2018 has been approved by CEN as EN ISO 4957:2018 without any modification.iiBS EN ISO 4957:2018ISO 4957:20
15、18Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 24 Classification and designation . 24.1 Classification . 24.2 Designation 25 Information to be supplied by the purchaser. 35.1 Mandatory information . 35.2 Options . 35.3 Ordering example . 36 Manufacturing process . 36.1 Gen
16、eral . 36.2 Heat-treatment condition and surface condition on delivery 46.2.1 General 46.2.2 Heat-treatment condition 46.2.3 Surface condition . 47 Requirements 47.1 General requirements . 47.2 Chemical composition and mechanical properties . 47.3 Surface quality . 47.4 Shape, dimensions and toleran
17、ces . 58 Inspection, testing and conformance of products 58.1 Inspection and testing procedures and types of inspection documents . 58.2 Specific inspection and testing 58.2.1 Number of sample products 58.2.2 Sampling 68.2.3 Test methods . 68.2.4 Retests . 68.2.5 Sorting and reprocessing 69 Marking
18、710 Tables . 711 Location of test pieces in the hardening test 1811.1 Product diameter or thickness 15 mm . 1811.2 Product diameter or thickness 15 mm . 19Annex A (informative) Hardness-tempering temperature curves20Annex B (normative) Supplementary or special requirements 30Annex C (informative) De
19、signations of comparable steels .32Bibliography .34 ISO 2018 All rights reserved iiiContents PageBS EN ISO 4957:2018ISO 4957:2018ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Internat
20、ional 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 I
21、SO, 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, P
22、art 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
23、 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 re
24、ceived (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 voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment,
25、 as well as information about ISOs 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.This document was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 4, Heat treatable and alloy
26、steels.This third edition cancels and replaces the second edition (ISO 4957:1999), which has been technically revised.The main changes compared with the previous edition are as follows: the delivery condition normalized/normalized rolled has been introduced; for surface quality, ISO 9443 for bars an
27、d ISO 7788 for plates now apply; an additional clause for sorting and reprocessing has been introduced; the normative references have been updated.iv ISO 2018 All rights reservedBS EN ISO 4957:2018Tool steels1 ScopeThis document specifies requirements for the following grades of wrought tool steels:
28、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 document applies to all types of hot-rolled, forged, cold-drawn or cold-rolled products or products produced by powder metallurgy, which are supplie
29、d in one of the surface and heat-treatment conditions given in 6.2 and Table 1.NOTE 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 steel
30、s for tools are specified in regional, national or company standards.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 is based on ISO 4955.2 Normative referencesThe following documents are referred t
31、o in the text in such a way that some or all of their content constitutes requirements 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 377, Steel and steel products Lo
32、cation and preparation of samples and test pieces for mechanical testingISO 404, Steel and steel products General technical delivery requirementsISO 1035-1, Hot-rolled steel bars Part 1: Dimensions of round barsISO 1035-3, Hot-rolled steel bars Part 3: Dimensions of flat barsISO 1035-4:1982, Hot-rol
33、led steel bars Part 4: TolerancesISO 4885, Ferrous materials Heat treatments VocabularyISO 4948-1, Steels Classification Part 1: Classification of steels into unalloyed and alloy steels based on chemical compositionISO/TS 4949, Steel names based on letter symbolsISO 6506-1, Metallic materials Brinel
34、l hardness test Part 1: Test methodISO 6508-1, Metallic materials Rockwell hardness test Part 1: Test methodISO 6929, Steel products VocabularyISO 7452:2013, Hot rolled steel plates Tolerances on dimensions and shapeISO 7788, Steel Surface finish of hot-rolled plates and wide flats Delivery requirem
35、entsINTERNATIONAL STANDARD ISO 4957:2018 ISO 2018 All rights reserved 1BS EN ISO 4957:2018ISO 4957:2018ISO 9443, Surface quality classes for hot-rolled bars and wire rodISO/TR 9769, Steel and iron Review of available methods of analysisISO 10474, Steel and steel products Inspection documentsISO 1428
36、4, Steel and iron Sampling and preparation of samples for the determination of chemical compositionISO 17577, Steel Ultrasonic testing of steel flat products of thickness equal to or greater than 6 mm3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 488
37、5, ISO 4948-1 and ISO 6929 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at https:/www.iso.org/obp IEC Electropedia: available at http:/www.electropedia.org/3.1tool steelspecial ste
38、el suitable for working or processing of materials, for handling and measuring workpieces and, for this purpose, exhibiting high hardness and wear resistance and/or toughness3.2cold-work tool steelnon-alloy or alloy tool steel (3.1) for applications in which the surface temperature is generally belo
39、w 200 C3.3hot-work tool steelalloy tool steel (3.1) for applications in which the surface temperature is generally over 200 C3.4high-speed tool steelsteel used mainly for machining and for forming processes and which, because of the chemical composition, has the highest high-temperature hardness and
40、 temper resistance up to about 600 C4 Classification and designation4.1 ClassificationThe classification of the relevant steel grades shall be in accordance with ISO 4948-1.4.2 DesignationFor the steel grades covered by this document, the steel names, as given in the relevant tables, shall be alloca
41、ted in accordance with ISO/TS 4949.For information on designation of comparable steels, see Annex C.2 ISO 2018 All rights reservedBS EN ISO 4957:2018ISO 4957:20185 Information to be supplied by the purchaser5.1 Mandatory informationThe manufacturer shall obtain the following information from the pur
42、chaser at the time of enquiry and order:a) the quantity to be delivered;b) the product form (e.g. round bar);c) either the dimensional standard and the dimensions and tolerances selected from it (see 7.4) or any other document covering the dimensions and tolerances required for the product;d) the re
43、ference to this document, i.e. ISO 4957;e) the designation of the steel type (see Tables 2, 4, 6 and 8);f) the symbol for the heat-treatment condition on delivery (see Table 1) and, if the products are to be delivered in the quenched and tempered condition, the hardness values required;g) the type o
44、f inspection document in accordance with ISO 10474.5.2 OptionsA number of options are specified in this document and listed below. If the purchaser does not indicate the wish to implement any of these options, the products shall be supplied in accordance with the basic specifications of this documen
45、t (see 5.1):a) if a surface condition other than “hot worked” or a special surface quality is required, the surface condition (see 6.2.3) and the surface quality (see 7.3);b) any supplementary requirement that shall be complied with, the symbol and, where necessary, the details of this supplementary
46、 requirement (in accordance with Annex B).5.3 Ordering exampleEXAMPLE 2 t hot-rolled round bars in accordance with ISO 1035-1; with a nominal diameter of 30,0 mm; with a nominal length of 4 000 mm; with a tolerance on diameter of 0,30 mm (class S of ISO 1035-4:1982); with a tolerance on length of +1
47、0 mm (class L2 of ISO 1035-4:1982); all other tolerances as given in ISO 1035-4 for normal cases, surface as hot worked made of steel grade in accordance with this document, type X153CrMoV12 (see Table 4); heat-treatment condition: annealed (soft annealed) (symbol +A, see Table 1); with an inspectio
48、n certificate 3.1 (see ISO 10474).2 t rounds ISO 1035-1 and -4 30,0 S x 4000 L2 Steel ISO 4957-X153CrMoV12+AISO 10474 3.16 Manufacturing process6.1 GeneralThe manufacturing process of the steel and the products is left to the discretion of the manufacturer, with the restrictions given in 6.2. Upon r
49、equest, the purchaser shall be informed what steel making process is being used. ISO 2018 All rights reserved 3BS EN ISO 4957:2018ISO 4957:20186.2 Heat-treatment condition and surface condition on delivery6.2.1 General The heat-treatment and surface conditions of the products shall comply with the agreements made at the time of ordering.6.2.2 Heat-treatment conditionThe heat-treatment conditions are given in Table 1.Unless otherwise specified in the order, the tool steels except C45U (Table 2), 35CrMo7
