1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Metallic materials Tensile testingPart 2: Method of test at elevated temperature (ISO 6892-2:2018)BS EN ISO 6892-2:2018Incorporating corrigendum August 2018National forewordThis British Standard is the UK implementation
2、 of EN ISO 6892-2:2018. It is identical to ISO 6892-2:2018. It supersedes BS EN ISO 6892-2:2011, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee ISE/101/1, Uniaxial testing.A list of organizations represented on this committee can be obtained on reques
3、t to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 539 02150 9ICS 77.040.10Compliance with a British St
4、andard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2018.Amendments/corrigenda issued since publicationDate Text affected31 August 2018 Implementation of CEN correction notice 4 April 2
5、018: European foreword, final paragraph: Serbia addedBRITISH STANDARDBS EN ISO 6892-2:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 68922May 2018ICS 77.040.10 Supersedes EN ISO 6892-2:2011EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCE
6、NCENELEC Management Centre: Avenue Marnix 17, B1000 Brussels 2018 CEN Ref. No. EN ISO 6892-2:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersMetallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO 6892-2:201
7、8)Matriaux mtalliques - Essai de traction - Partie 2: Mthode dessai temprature leve (ISO 6892-2:2018)Metallische Werkstoffe - Zugversuch - Teil 2: Prfverfahren bei erhhter Temperatur (ISO 6892-2:2018)This European Standard was approved by CEN on 3 May 2018.CEN members are bound to comply with the CE
8、N/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 Ce
9、ntre 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 th
10、e 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, Netherl
11、ands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN ISO 68922:2018 (E)European forewordThis document (EN ISO 6892-2:2018) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals“ in col
12、laboration 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 text or by endorsement, at the latest by N
13、ovember 2018, and conflicting national standards shall be withdrawn at the latest by November 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.Thi
14、s document supersedes EN ISO 6892-2:2011.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 Yu
15、goslav 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 noticeThe text of ISO 6892-
16、2:2018 has been approved by CEN as EN ISO 6892-2:2018 without any modification.iiBS EN ISO 6892-2:2018ISO 68922:2018Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and designations 25 Principle 36 Test piece 37 Determination of original crosssectional
17、 area (So) 38 Marking the original gauge length (Lo) . 39 Apparatus . 39.3.1 Permitted deviations of temperature 49.3.2 Measurement of temperature . 49.3.3 Verification of the temperature-measuring system . 410 Test conditions . 510.1 Setting the force zero point 510.2 Gripping of the test piece, fi
18、xing of the extensometer and heating of the test piece, not necessarily in the following sequence 510.2.1 Method of gripping 510.2.2 Fixing of the extensometer and establishing the gauge length . 510.2.3 Heating of the test piece 610.3 Testing rate based on strain rate control (Method A) . 610.3.1 G
19、eneral 610.3.2 Strain rate for the determination of the upper yield strength (ReH) or proof strength properties (Rpand, if required, Rt) . 610.3.3 Strain rate for the determination of the lower yield strength (ReL) and percentage yield point extension (Ae), if required . 610.3.4 Strain rate for the
20、determination of the tensile strength (Rm), percentage elongation after fracture (A), percentage reduction area (Z), and, if required, percentage total extension at the maximum force (Agt), percentage plastic extension at maximum force (Ag) 710.4 Method of testing with expanded strain rate ranges (M
21、ethod B) . 710.4.1 General 710.4.2 Rate for the determination of yield strength or proof strength properties 710.4.3 Rate for the determination of tensile strength 710.5 Choice of the method and rates 710.6 Documentation of the chosen testing conditions 811 Determination or calculation of the proper
22、ties. 812 Test report . 813 Measurement uncertainty 914 Figures . 915 Annexes .10Annex A (informative) Addition to ISO 68921:2016, Annexes B and D .12Annex B (informative) Measurement uncertainty 18Bibliography .21 ISO 2018 All rights reserved iiiContents PageBS EN ISO 6892-2:2018ISO 68922:2018Forew
23、ordISO (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 technic
24、al 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 el
25、ectrotechnical 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
26、 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 paten
27、t 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 co
28、nstitute 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 adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) s
29、ee the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee SC 1, Uniaxial testing.This second edition cancels and replaces the first edition (ISO 6892-2:2011), of which it constitutes a minor revision.T
30、he main changes compared to the previous edition are as follows: a note has been added after the first sentence of 10.2.1; some references to subclauses of ISO 6892-1 have been deleted.A list of all parts in the ISO 6892 series can be found on the ISO website.iv ISO 2018 All rights reservedBS EN ISO
31、 6892-2:2018ISO 68922:2018IntroductionIn this document, two methods of testing speeds are described. The first, Method A, is based on strain rates (including crosshead separation rate) with narrow tolerances (20 %) and the second, Method B, is based on conventional strain rate ranges and tolerances.
32、 Method A is intended to minimize the variation of the test rates during the moment when strain rate-sensitive parameters are determined and to minimize the measurement uncertainty of the test results.The influence of the testing speed on the mechanical properties, determined by the tensile test, is
33、 normally greater at an elevated temperature than at room temperature.Traditionally, mechanical properties determined by tensile tests at elevated temperatures have been determined at a slower strain or stressing rate than at room temperature. This document recommends the use of slow strain rates bu
34、t, in addition, higher strain rates are permitted for particular applications, such as comparison with room temperature properties at the same strain rate.During discussions concerning the speed of testing in the preparation of this document, it was decided to consider deleting the stress rate metho
35、d in future revisions. ISO 2018 All rights reserved vBS EN ISO 6892-2:2018This page deliberately left blankMetallic materials Tensile testing Part 2: Method of test at elevated temperatureWARNING This document calls for the use of substances and/or procedures that can be injurious to health if adequ
36、ate safety measures are not taken. This document does not address any health hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this document to establish appropriate health, safety and environmentally acceptable practices.1 ScopeThis document s
37、pecifies a method of tensile testing of metallic materials at temperatures higher than room temperature.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 references, only the
38、edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 6892-1, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 7500-1, Metallic materials Calibration and verification of static uniaxial test
39、ing machines Part 1: Tension/compression testing machines Calibration and verification of the force-measuring systemISO 9513, Metallic materials Calibration of extensometer systems used in uniaxial testing3 Terms and definitionsFor the purposes of this document, the terms and definitions given in IS
40、O 6892-1 apply with the following exceptions and supplements.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/obpIn general, al
41、l test piece geometries/dimensions are based on measurements taken at room temperature. The exception may be the extensometer gauge length (see 3.3 and 10.2.2).NOTE The following properties are generally not determined at elevated temperature unless required by relevant specifications or agreement:
42、permanent set strength (Rr); percentage permanent elongation; percentage permanent extension; percentage yield point extension (Ae); percentage total extension at maximum force (Agt);INTERNATIONAL STANDARD ISO 68922:2018 ISO 2018 All rights reserved 1BS EN ISO 6892-2:2018ISO 68922:2018 percentage pl
43、astic extension at maximum force (Ag); percentage total extension at fracture (At).3.1original gauge lengthLogauge length measured at room temperature before heating of the test piece and before application of force3.2percentage elongation after fractureApermanent elongation at room temperature of t
44、he gauge length after fracture (Lu Lo)Note 1 to entry: It is expressed as a percentage of the original gauge length (Lo) (3.1).Note 2 to entry: For further details, see ISO 6892-1.3.3extensometer gauge lengthLelength within the parallel portion of the test piece used for the measurement of extension
45、 (3.4) by means of an extensometer3.4extensionincrease in the extensometer gauge length (Le) (3.3) at a given moment during the test3.5percentage extensionextension (3.4) expressed as a percentage of the extensometer gauge length (Le) (3.3)3.6percentage reduction of areaZmaximum change in cross-sect
46、ional area which has occurred during the test (So Su)Note 1 to entry: It is expressed as a percentage of the original cross-sectional area (So), where Soand Suare calculated from the dimensions at room temperature.3.7stressRforce at any moment during the test divided by the original cross-sectional
47、area (So) of the test pieceNote 1 to entry: All stresses referred to in this document are engineering stresses, calculated using the cross-sectional area of the test piece derived from dimensions measured at room temperature.3.8soaking timetstime taken to stabilize the temperature of the test piece
48、prior to mechanical loading4 Symbols and designationsISO 6892-1 provides an extensive listing of symbols and their related designations.The additional symbols used in this document are given in Table 1.2 ISO 2018 All rights reservedBS EN ISO 6892-2:2018ISO 68922:2018Table 1 Symbols and designationsS
49、ymbol Unit DesignationT C specified temperature or nominal temperature at which the test should be performedTiC indicated temperature or measured temperature on the surface of the parallel length of the test piecetsmin soaking time5 PrincipleThe test involves straining a test piece by tensile force for the determination of one or more of the mechanical properties defined in Clause 3.The test is carried out at a temperature higher than 35 C, which means at temperatures higher than room temperature
