1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Steels Determination of the depth of decarburization (ISO 3887:2017)BS EN ISO 3887:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3887 January 2018 ICS 77.040.99 Supersedes EN ISO 3887:2003English Version
2、Steels - Determination of the depth of decarburization (ISO 3887:2017) Aciers - Dtermination de la profondeur de dcarburation (ISO 3887:2017) Stahl - Bestimmung der Entkohlungstiefe (ISO 3887:2017) This European Standard was approved by CEN on 21 November 2017. CEN members are bound to comply with t
3、he 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 Manageme
4、nt 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
5、 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,
6、Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
7、 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3887:2018 ENational forewordThis British Standard is the UK implementation of EN ISO 3887:2018. It is identical to ISO 3887:2017. It supersedes BS EN ISO 3887:2003, which is
8、 withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/101/7, Methods of physical and metallographic testing.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the nec
9、essary 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 90987 0ICS 77.080.20; 77.040.99Compliance with a British Standard cannot confer immunity from legal obligations. This Briti
10、sh Standard was published under the authority of the Standards Policy and Strategy Committee on 28 February 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 3887:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 3887 January 2018 ICS 77.040.99
11、 Supersedes EN ISO 3887:2003English Version Steels - Determination of the depth of decarburization (ISO 3887:2017) Aciers - Dtermination de la profondeur de dcarburation (ISO 3887:2017) Stahl - Bestimmung der Entkohlungstiefe (ISO 3887:2017) This European Standard was approved by CEN on 21 November
12、2017. 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 obtaine
13、d 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-C
14、ENELEC 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, I
15、taly, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management C
16、entre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 3887:2018 EBS EN ISO 3887:2018EN ISO 3887:2018 (E) 3 European foreword This document (EN ISO 3887:2018) has been prepared by Tech
17、nical Committee ISO/TC 17 “Steel” in collaboration with Technical Committee ECISS/TC 101 “Test methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical t
18、ext or by endorsement, at the latest by July 2018, and conflicting national standards shall be withdrawn at the latest by July 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
19、 any or all such patent rights. This document supersedes EN ISO 3887:2003. 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, De
20、nmark, 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. Endo
21、rsement notice The text of ISO 3887:2017 has been approved by CEN as EN ISO 3887:2018 without any modification. BS EN ISO 3887:2018ISO 3887:2017(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Sampling 25 Measuring methods . 25.1 General . 25.2 Metallographic method 35.2
22、.1 General 35.2.2 Selection and preparation of the sample 35.2.3 Measurement 35.3 Methods for measuring the micro-indentation hardness 55.3.1 General 55.3.2 Selection and preparation of the sample 75.3.3 Measurement 75.4 Methods of determination of the carbon content . 95.4.1 General 95.4.2 Chemical
23、 analysis 95.4.3 Spectrographic analysis . 95.4.4 Interpretation of the results (chemical and spectrographic methods) 95.4.5 Electron probe microanalysis (EPMA) 95.4.6 Glow discharge optical emission spectrometry (GDOES) .106 Test report 10Annex A (informative) Examples of typical decarburization mi
24、crostructure 12 ISO 2017 All rights reserved iiiContents PageBS EN ISO 3887:2018ISO 3887:2017(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carri
25、ed 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. I
26、SO 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
27、 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
28、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).A
29、ny 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, as well as information about ISOs
30、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 7, Methods of testing (other than mechanical tests and chemical
31、 analysis).This third edition cancels and replaces the second edition (ISO 3887:2003), which has been technically revised. The following changes have been made: the scope has been expanded from “non-alloy and low-alloy steels” to “steel products”; the definitions of “partial decarburization” and “co
32、mplete decarburization” have been modified; the term “depth of ferrite decarburization” has been deleted; the terms “depth profile of carbon content” and “depth profile of hardness” have been added; more measurement details for the micro-indentation hardness method have been added; two new methods o
33、f measuring the carbon depth profile, by GDOES and EPMA, have been added; examples of typical decarburization microstructures have been added.iv ISO 2017 All rights reservedBS EN ISO 3887:2018INTERNATIONAL STANDARD ISO 3887:2017(E)Steels Determination of the depth of decarburization1 ScopeThis docum
34、ent defines the decarburization and specifies three methods of measuring the depth of decarburization of steel products.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated refer
35、ences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4545-1, Metallic materials Knoop hardness test Part 1: Test methodISO 6507-1, Metallic materials Vickers hardness test Part 1: Test methodISO 9556, Stee
36、l and iron Determination of total carbon content Infrared absorption method after combustion in an induction furnaceISO 14594, Microbeam analysis Electron probe microanalysis Guidelines for the determination of experimental parameters for wavelength dispersive spectroscopyISO 14707, Surface chemical
37、 analysis Glow discharge optical emission spectrometry (GD-OES) Introduction to useISO 15349-2, Unalloyed steel Determination of low carbon content Part 2: Infrared absorption method after combustion in an induction furnace (with preheating)3 Terms and definitionsFor the purposes of this document, t
38、he following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at https:/www.iso.org/obp3.1decarburizationreduction of car
39、bon content from the surface zone of the steelNote 1 to entry: A distinction is made betweena) partial decarburization, d3, measured as the distance from the point at which the carbon content exceeds the solubility limit in ferrite, becoming visible as e.g. pearlite, to the point at which there is n
40、o more visible difference to the core carbon concentration, andb) complete decarburization, also called ferrite decarburization, d1, measured as the distance between the surface of the product and the point up to which the carbon content is below the solubility limit of carbon in ferrite so that onl
41、y ferrite is present.Note 2 to entry: The depth of complete decarburization as described in b) is determined by examination of the microstructure. ISO 2017 All rights reserved 1BS EN ISO 3887:2018ISO 3887:2017(E)3.2depth of functional decarburizationd2distance between the surface of the product and
42、the point at which the carbon content or hardness is at the level where the performance of the product would be unaffected by a reduction in carbon content (i.e. at the minimum level specified in the product standard)3.3depth of total decarburizationd4distance between the surface of the product and
43、the point at which the carbon content is that of the unaffected core, the sum of the partial and the complete decarburization d3+ d1being designated by the letters DDEXAMPLE DD = 0,08 mm.Note 1 to entry: Expressed in millimetres.3.4depth profile of carbon contentcurve indicating the relationship bet
44、ween the perpendicular distance from the surface of steel material and the carbon content3.5depth profile of hardnesscurve indicating the relationship between the perpendicular distance from the surface of steel material and the hardness4 SamplingSamples should be taken at locations that are represe
45、ntative of the bulk specimen. The location and number of samples taken depend on the nature of the material to be tested and are defined by agreement between the parties concerned.Specimens for the metallographic methods or micro-indentation hardness tests or electron probe microanalysis should be c
46、ut from the bulk specimen perpendicular to the longitudinal axis of the product so that measurements are made on a transverse plane. This procedure permits the determination of the variation of decarburization around the periphery of the specimen. Unless otherwise specified, the corner parts which c
47、an generate abnormal decarburization shall not be included. For specimens up to about 2,5 cm diameter, the entire cross-section is polished and examined. For larger cross-sections, one or more specimens shall be prepared to assess variations in surface decarburization. The sampling scheme for large
48、sections should be determined by agreement between the parties concerned.Specimens for chemical analytical methods shall be of sufficient length so that the weight of incremental turnings is adequate for chemical analysis or the size of milled surfaces is large enough for sparking yet small enough t
49、o fit in the specimen holder.5 Measuring methods5.1 GeneralThe choice of the method and its accuracy depend on the degree of decarburization, the microstructure, the carbon content of the product examined and the shape of the component.The usual methods employed on finished products are as follows: metallographic method (see 5.2);2 ISO 2017 All rights reservedBS EN ISO 3887:2018ISO 3887:2017(E) method for measuring the micro-indentation hardness (Vickers or Knoop) for steels in the hardened or quenched and tempered
