1、BSI Standards PublicationBS EN ISO 6892-3:2015Metallic materials TensiletestingPart 3: Method of test at low temperatureBS EN ISO 6892-3:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO6892-3:2015.The UK participation in its preparation was entrusted to
2、TechnicalCommittee ISE/101/1, Uniaxial testing.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standa
3、rds Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 77728 8ICS 77.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2015.Amendm
4、ents issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6892-3 April 2015 ICS 77.040.10 English Version Metallic materials - Tensile testing - Part 3: Method of test at low temperature (ISO 6892-3:2015) Matriaux mtalliques - Essai de traction - Partie
5、3: Mthode dessai basse temprature (ISO 6892-3:2015) Metallische Werkstoffe - Zugversuch - Teil 3: Prfverfahren bei tiefen Temperaturen (ISO 6892-3:2015) This European Standard was approved by CEN on 3 January 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipu
6、late 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 Centre or to any CEN member. This European S
7、tandard 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 the official versions. CEN members are the
8、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, Netherlands, Norway, Poland, Portugal, Romania,
9、 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: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any
10、 means reserved worldwide for CEN national Members. Ref. No. EN ISO 6892-3:2015 EBS EN ISO 6892-3:2015EN ISO 6892-3:2015 (E) 3 Foreword This document (EN ISO 6892-3:2015) has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of metals” in collaboration with Technical Committee ECIS
11、S/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 October 2015, and conflicting national s
12、tandards shall be withdrawn at the latest by October 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN-CENELE
13、C 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 Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Icel
14、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 6892-3:2015 has been approved by CEN as EN ISO 6892-3:2015 without any modifica
15、tion. BS EN ISO 6892-3:2015ISO 6892-3:2015(E)Foreword vIntroduction vi1 Scope . 12 Normative references 13 Terms and definitions . 14 Symbols and designations 25 Principle 36 Test piece 37 Determination of original cross-sectional area (So) 38 Marking the original gauge length (Lo) . 39 Apparatus .
16、39.1 Force measuring system . 39.2 Extensometer . 39.3 Cooling device 39.3.1 General 39.3.2 Permitted deviations of temperature 49.3.3 Measurement of temperature . 49.3.4 Verification of the temperature-measuring system . 510 Test conditions . 510.1 Setting the force zero point 510.2 Gripping of the
17、 test piece, fixing of the extensometer and cooling 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 Cooling of the test piece . 610.3 Testing rate based on strain rate control (Meth
18、od A) . 610.3.1 General 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 . 710.3.4 Stra
19、in rate for the 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 strai
20、n rate ranges (Method 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 810.5 Choice of the method and rates 810.6 Documentation of the chosen testing conditions 811 Determination or calculati
21、on of the properties. 812 Test report . 813 Measurement uncertainty 914 Figures 1015 Annexes .11Annex A (informative) Addition to ISO 6892-1:2009, Annexes B and D .12 ISO 2015 All rights reserved iiiContents PageBS EN ISO 6892-3:2015ISO 6892-3:2015(E)Annex B (informative) Example for cooling curves
22、of steel depending on test piece dimensions and the specified test temperature in ethanol and liquid nitrogen 17Annex C (informative) Measurement uncertainty .21Bibliography .22iv ISO 2015 All rights reservedBS EN ISO 6892-3:2015ISO 6892-3:2015(E)ForewordISO (the International Organization for Stand
23、ardization) 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
24、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.The procedures us
25、ed 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 drafted in accordance with the editorial rules
26、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 patent rights. Details of any patent rights identifie
27、d 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 constitute an endorsement.For an explanation on th
28、e meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information .The committee responsible for this document is ISO/
29、TC 164, Metallic materials, Subcommittee SC 1, Uniaxial testing.This first edition cancels and replaces ISO 15579:2000.ISO 6892 consists of the following parts, under the general title Metallic materials Tensile testing: Part 1: Method of test at room temperature Part 2: Method of test at elevated t
30、emperature Part 3: Method of test at low temperature Part 4: Method of test in liquid helium ISO 2015 All rights reserved vBS EN ISO 6892-3:2015ISO 6892-3:2015(E)IntroductionIn this edition, there are two methods of testing speeds available. The first one, Method A, is based on strain rates (includi
31、ng crosshead separation rate) with narrow tolerances (20 %) and the second, Method B, is based on conventional strain rate ranges and tolerances. 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 th
32、e measurement uncertainty of the test results.Mechanical properties determined by tensile test at low temperatures have been determined at the same rates at room temperature. This revised part of ISO 6892 incorporates the new set of testing rates of ISO 6892-1 and ISO 6892-2, developed to reduce the
33、 variability of test results.vi ISO 2015 All rights reservedBS EN ISO 6892-3:2015Metallic materials Tensile testing Part 3: Method of test at low temperatureWARNING This International Standard calls for the use of substances and/or procedures that can be injurious to health if adequate safety measur
34、es are not taken. This International Standard does not address any health hazards, safety or environmental matters associated with its use. It is the responsibility of the user of this International Standard to establish appropriate health, safety and environmentally acceptable practices and take su
35、itable actions for any national and international regulations. Compliance with this International Standard does not in itself confer immunity from legal obligations.1 ScopeThis part of ISO 6892 specifies a method of tensile testing of metallic materials at temperatures between +10 C and -196 C.2 Nor
36、mative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments)
37、 applies.ISO 6892-1:2009, Metallic materials Tensile testing Part 1: Method of test at room temperatureISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring systemISO 9513, Meta
38、llic materials Calibration of extensometer systems used in uniaxial testing3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 6892-1:2009 and the following apply.In general, all test piece geometries/dimensions are based on measurements taken at room tem
39、perature. The exception can be the extensometer gauge length (see 3.3).NOTE The following properties are generally not determined at low temperature unless required by relevant specifications or agreement: permanent set strength (Rr); percentage permanent elongation; percentage permanent extension;
40、percentage yield point extension (Ae); percentage total extension at maximum force (Agt); percentage plastic extension at maximum force (Ag); percentage total extension at fracture (At).INTERNATIONAL STANDARD ISO 6892-3:2015(E) ISO 2015 All rights reserved 1BS EN ISO 6892-3:2015ISO 6892-3:2015(E)3.1
41、original gauge lengthLogauge length measured at room temperature before cooling of the test piece and before application of force3.2percentage elongation after fractureApermanent elongation of the gauge length, measured at room temperature, after fracture (Lu-Lo), expressed as a percentage of the or
42、iginal gauge length (Lo)Note 1 to entry: For further details, see ISO 6892-1:2009.3.3extensometer gauge lengthLeinitial extensometer gauge length used for measurement of extension by means of an extensometer3.4extensionincrease in the extensometer gauge length (Le) at a given moment during the test3
43、.4.1percentage extensionextension (3.4) expressed as a percentage of the extensometer gauge length (Le)3.5percentage reduction of areaZmaximum change in cross-sectional area which has occurred during the test (So-Su), expressed as a percentage of the original cross-sectional area (So), where Soand S
44、uare calculated from the dimensions at room temperature3.6stressRforce at any moment during the test divided by the original cross-sectional area (So) of the test pieceNote 1 to entry: All stresses referenced in this part of ISO 6892 are engineering stresses, calculated using the cross-sectional are
45、a of the test piece derived from dimensions measured at room temperature.3.7soaking timetstime taken to stabilize the temperature of the test piece prior to mechanical loading4 Symbols and designationsAdditional symbols to ISO 6892-1:2009, Table 1 used throughout this International Standard and thei
46、r designation are given in Table 1.Table 1 Symbols and designationsSymbol 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 time2
47、 ISO 2015 All rights reservedBS EN ISO 6892-3:2015ISO 6892-3:2015(E)5 PrincipleThe test involves straining a test piece by tensile force for the determination of one or more of the mechanical properties defined in ISO 6892-1:2009, Clause 3.The test is carried out at a specified temperature between +
48、10 C and -196 C.6 Test pieceFor requirements concerning test pieces, see ISO 6892-1:2009, Clause 6.NOTE Additional examples of test pieces are given in Annex A.7 Determination of original cross-sectional area (So)For requirements concerning the determination of the original cross-sectional area, see
49、 ISO 6892-1:2009, Clause 7.NOTE This parameter is calculated from measurements taken at room temperature.8 Marking the original gauge length (Lo)For requirements concerning marking the original gauge length, see ISO 6892-1:2009, Clause 8.9 Apparatus9.1 Force measuring systemThe force-measuring system of the testing machine shall be calibrated in accordance with ISO 7500-1, class 1 or better.9.2 ExtensometerFor the determination of proof strength (plastic or total extension), the extensometer used shall be in acco
