BS EN ISO 2639-2002 Steels - Determination and verification of the depth of carburized and hardened cases《钢 渗碳层和硬化层的深度的测定和检验》.pdf

1、BRITISH STANDARD BS EN ISO 2639:2002 Incorporating Corrigendum No. 1 Steels Determination and verification of the depth of carburized and hardened cases The European Standard EN ISO 2639:2002 has the status of a British Standard ICS 77.040.99 BS EN ISO 2639:2002 This British Standard, having been pr

2、epared under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 27 November 2002 BSI 22 January 2003 ISBN 0 580 40812 4 National foreword This British Standard is the official English language ver

3、sion of EN ISO 2639:2002. It is identical with ISO 2639:2002. It supersedes BS 6479:1984 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee ISE/72, Methods of physical and metallographic testing, which has the responsibility to: A list of organizations r

4、epresented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence In

5、dex”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself co

6、nfer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promul

7、gate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 5, the Annex ZA, an inside back cover and a back cover. The BSI copyright date displayed

8、 in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 14310 Corrigendum No. 1 22 January 2003 Replacing the EN ISO foreword page and incorporating the Annex ZA pageEUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO2639 November200

9、2 ICS77.040.99 Englishversion SteelsDeterminationandverificationofthedepthofcarburized andhardenedcases(ISO2639:2002) AcierDterminationetvrificationdelaprofondeurde cmentation(ISO2639:2002) StahlBestimmungundPrfungderEinsatzhrtungstiefe (ISO2639:2002) ThisEuropeanStandardwasapprovedbyCENon15October2

10、002. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheManagementCentreorto

11、anyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheManagementCentrehasthesamestatusasthe official versions. CENmembersarethenationalstandardsbodiesofAu

12、stria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece, Iceland,Ireland,Italy,Luxembourg,Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,3

13、6B1050Brussels 2002CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO2639:2002ECORRECTED20021218 Foreword Thisdocument(ENISO2639:2002)hasbeenpreparedbyTechnicalCommitteeISO/TC17 “Steel“incollaborationwithTechnicalCommitteeECISS/TC2“SteelPhysicochem

14、icaland nondestructivetesting“,thesecretariatofwhichisheldbyAFNOR. ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationof anidenticaltextorbyendorsement,atthelatestbyMay2003,andconflictingnationalstandards shallbewithdrawnatthelatestbyMay2003. AccordingtotheCEN/CENELECInt

15、ernalRegulations,thenationalstandardsorganizationsof thefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg, Malta,Netherlands,Norway,Portugal,Spain,Sweden,SwitzerlandandtheUnitedKingdom. Endo

16、rsementnotice ThetextofISO2639:2002hasbeenapprovedbyCENasENISO2639:2002withoutany modifications. NOTENormativereferencestoInternationalStandardsarelistedinAnnexZA(normative). ENISO2639:2002 Reference number ISO 2639:2002(E)INTERNATIONAL STANDARD ISO 2639 Third edition 2002-11-01 Steels Determination

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22、iso.ch Pritni denS witlrez dnaii ENISO2639:2002 iiiForeword 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. Eac

23、h 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 Internation

24、al 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. The main task of technical committees is to prepare International Standards. Draft International Standard

25、s 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

26、 the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2639 was prepared by Technical Committee ISO/TC 17, Steel, Subcommittee SC 7, Methods of testing (other than mechanical tests and chemical analysis). This third edition cancels and rep

27、laces the second edition (ISO 2639:1982), which has been technically revised. ENISO2639:2002INTENRATIONAL TSANDADR IS:9362 O2002(E)Steels Determination and verification of the depth of carburized and hardened cases 1 Scope This International Standard defines the case-hardened depth, and specifies me

28、thods for the determination of this depth, in steel. It is applicable to a) carburized cases and carbonitrided cases; b) parts that, when heat treated to final hardness, have a hardness of less than 450 HV 1 at a distance of three times the case-hardened depth, from the surface. The case-hardened de

29、pth is defined by special agreement where these conditions are not met. For steels that, in the part under test, and at a distance of three times the case-hardened depth from the surface, present a hardness greater than 450 HV 1, the criterion can still be used, provided that a limiting hardness val

30、ue greater than 550 HV 1 in steps of 25 units be selected for the case-hardened depth. 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

31、 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

32、of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 4545, Metallic materials Hardness test Knoop test ISO 6507-1, Metallic materials Vickers hardness test Part 1: Test method 3 Term and definition For the purposes o

33、f this International Standard, the following term and definition applies. 3.1 case-hardened depth (of a carburized and hardened case) perpendicular distance between the surface and the layer having a hardness of 550 HV 1 in accordance with ISO 6507-1 or equivalent Knoop hardness in accordance with I

34、SO 4545 ENISO2639:20021ISO 2639:2002(E) 2 I SO 2002 All irthgs ersedevr4 Conventions 4.1 Designation The case-hardened depth is designated by the letters CHD and is expressed in millimetres, e.g.: CHD = 0,8 mm. 4.2 Special cases 4.2.1 Vickers hardness measurements By agreement between the parties co

35、ncerned, Vickers hardness measurements within the range of HV 0,5 (4,9 N) to HV 1 (9,8 N) may be used. By agreement between the parties concerned limiting hardness values other than 550 HV 1 may be used. The use of another load or another limiting hardness shall be shown after the letters CHD, e.g.:

36、 CHD 515 HV 5. 4.2.2 Knoop hardness measurement By agreement between the parties concerned, measurement of the Knoop hardness may be used. 5 Determination of case-hardened depth 5.1 General The following method for the determination of the case-hardened depth is the only one applicable in the event

37、of a dispute. 5.2 Principle The case-hardened depth is determined from the gradient of hardness on a cross-section normal to the surface. It is derived graphically from a curve representing the variation in hardness as a function of the distance from the surface of a part. 5.3 Procedure 5.3.1 Test s

38、pecimen The measurement shall be made, unless otherwise specially agreed, on a cross-section of a part in a specified condition. 5.3.2 Preparation of the surface to be examined Polish the surface on which measurement is to be made so as to permit correct measurement of the size of the hardness impre

39、ssions. Take all precautions to avoid rounding the edges of the surface and overheating the part. 5.3.3 Determination of hardness Make hardness impressions along one or more parallel lines normal to the surface and within a band of width, W, 1,5 mm (see Figure 1). ENISO2639:20022ISO 2639:2002(E) I S

40、O 2002 All irthgs ersedevr 3Figure 1 Position of hardness impressions The distance, S, separating two adjacent impressions shall be not less than 2,5 times their diagonal (see Figure 1). The difference between the successive distances of each impression from the surface (e.g. a 2 a 1 ) shall not exc

41、eed 0,1 mm and the cumulative distances from the surface shall be measured to an accuracy of 25 m. The diagonals of the impression shall be measured to an accuracy of 0,5 m. Make impressions using a load of HV 0,1 (0,98 N) to HV 1 (9,8 N) or Knoop impressions under appropriate conditions and carry o

42、ut their measurement using an optical device (camera system) giving a minimum magnification of 400 unless otherwise agreed between the parties concerned. Make the measurements on the prepared surface in two or more bands, the location of which shall be agreed between the parties concerned and for ea

43、ch band, plot the results in order to obtain the curve representing the variations in hardness as a function of distance from the surface. 5.4 Expression of results From the two curves plotted, determine, for each band of the surface in question, the distance from the surface of the part at which th

44、e hardness is equal to 550 HV or equivalent Knoop hardness; such a distance represents the case-hardened depth of the band. If the difference between these two values is less than or equal to 0,1 mm, take the mean of these two distances as the case-hardened depth; if the difference between these two

45、 values is greater than 0,1 mm, repeat the test. 6 Verification of case-hardened depth If the thickness of the carburized case is specified, the following interpolation method may be used as a method of verification of the case-hardened depth. This is possible because the hardness gradient may be ap

46、proximately represented by a straight line in that transitional area where the case-hardened depth, as defined in this International Standard, would end. Make at least five impressions on a normal cross-section of the part under test, at each of the distances d 1and d 2from the surface, distance d 1

47、and d 2being respectively below and above the value for the specified case-hardened depth (see Figure 2). The value of d 2 d 1 shall not exceed 0,3 mm. ENISO2639:20023ISO 2639:2002(E) 4 I SO 2002 All irthgs ersedevrFigure 2 Position of hardness measurement points The case-hardened depth is given by

48、the formula 211s 1 12 () () CHD ddHH d HH =+ where H sis the specified hardness; 12 , H H are the arithmetic means of the hardness values measured at distances d 1and d 2(see Figure 3). Figure 3 Mathematical verification of the case-hardened depth NOTE When using the interpolation method, it is good practice to check the hardness immediately below the surface. If there