1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 6892-2:2011Metallic materials T e n s i l e t e s t i n gPart 2: Method of test at elevated temperature (ISO 6892-2:2011)BS EN ISO 6892-2:2011 BRITISH STANDARDNational
2、forewordThis British Standard is the UK implementation of EN ISO6892-2:2011. It supersedes BS EN 10002-5:1992, which is withdrawn. The UK participation in its preparation was entrusted to TechnicalCommittee ISE/101/1, Uniaxial testing.A list of organizations represented on this committee can beobtai
3、ned on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011 ISBN 978 0 580 62202 1 ICS 77.040.10 Compliance with a British Standard cannot confer immunity fromlegal obligations.This
4、 British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2011. Amendments issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 6892-2 February 2011 ICS 77.040.10 Supersedes EN 10002-5:1991
5、English Version Metallic materials - Tensile testing - Part 2: Method of test at elevated temperature (ISO 6892-2:2011) Matriaux mtalliques - Essai de traction - Partie 2: Mthode dessai temprature leve (ISO 6892-2:2011)Metallische Werkstoffe - Zugversuch - Teil 2: Prfverfahren bei erhhter Temperatur
6、 (ISO 6892-2:2011) This European Standard was approved by CEN on 14 February 2011. 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
7、 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, German). A version in any other language made by translation under the r
8、esponsibility 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, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany
9、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Ma
10、nagement Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 6892-2:2011: EBS EN ISO 6892-2:2011EN ISO 6892-2:2011 (E) 3 Foreword This document (EN ISO 6892-2:2011) has been prepared b
11、y Technical Committee ISO/TC 164 “Mechanical testing of metals“ 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
12、 publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENE
13、LEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 10002-5:1991. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgiu
14、m, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement
15、 notice The text of ISO 6892-2:2011 has been approved by CEN as a EN ISO 6892-2:2011 without any modification. BS EN ISO 6892-2:2011ISO 6892-2:2011(E) ISO 2011 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Symbols and de
16、signations.2 5 Principle .3 6 Test piece .3 7 Determination of original cross-sectional area (So).3 8 Marking the original gauge length (Lo)3 9 Apparatus.3 10 Test conditions 5 11 Determination or calculation of the properties 8 12 Test report8 13 Measurement uncertainty.9 14 Figures9 15 Annexes10 A
17、nnex A (informative) Addition to Annexes B and D of ISO 6892-1:2009.11 Annex B (informative) Measurement uncertainty 17 Bibliography20 BS EN ISO 6892-2:2011ISO 6892-2:2011(E) iv ISO 2011 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of
18、 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 to be represented on that committee. Int
19、ernational 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. International Standards are drafted in accordance with t
20、he rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval
21、by at least 75 % of the member bodies casting a vote. 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. ISO 6892-2 was prepared by Technical Committee
22、ISO/TC 164, Mechanical testing of metals, Subcommittee SC 1, Uniaxial testing. This first edition of ISO 6892-2 cancels and replaces ISO 783:1999. 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:
23、Method of test at elevated temperature The following parts are planned: Part 3: Method of test at low temperature Part 4: Method of test in liquid helium BS EN ISO 6892-2:2011ISO 6892-2:2011(E) ISO 2011 All rights reserved vIntroduction In this part of ISO 6892, two methods of testing speeds are des
24、cribed. 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. Method A is intended to minimize the variation of the test rates during the moment when stra
25、in 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 normally greater at an elevated temperature than at room temperature. Traditionally, mechan
26、ical properties determined by tensile tests at elevated temperatures have been determined at a slower strain or stressing rate than at room temperature. This part of ISO 6892 recommends the use of slow strain rates but, in addition, higher strain rates are permitted for particular applications, such
27、 as comparison with room temperature properties at the same strain rate. During discussions concerning the speed of testing in the preparation of this part of ISO 6892, it was decided to consider deleting the stress rate method in future revisions. BS EN ISO 6892-2:2011BS EN ISO 6892-2:2011INTERNATI
28、ONAL STANDARD ISO 6892-2:2011(E) ISO 2011 All rights reserved 1Metallic materials Tensile testing Part 2: Method of test at elevated temperature WARNING This International Standard calls for the use of substances and/or procedures that may be injurious to health if adequate safety measures are not t
29、aken. 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 suitable actio
30、ns for any national and international regulations. Compliance with this International Standard does not in itself confer immunity from legal obligations. 1 Scope This part of ISO 6892 specifies a method of tensile testing of metallic materials at temperatures higher than room temperature. 2 Normativ
31、e references The following referenced documents are indispensable for the application 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 6892-1:2009, Metallic materials
32、Tensile testing Part 1: Method of test at room temperature ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/compression testing machines Verification and calibration of the force-measuring system ISO 9513, Metallic materials Calibration of extensometers
33、 used in uniaxial testing 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 6892-1:2009 apply with the following exceptions and supplements. In general, all test piece geometries/dimensions are based on measurements taken at room temperature. The excep
34、tion 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: permanent set strength (Rr); percentage permanent elongation; percentage permanent extension; pe
35、rcentage yield point extension (Ae); BS EN ISO 6892-2:2011ISO 6892-2:2011(E) 2 ISO 2011 All rights reserved percentage total extension at maximum force (Agt); percentage plastic extension at maximum force (Ag); percentage total extension at fracture (At). 3.1 original gauge length Logauge length mea
36、sured at room temperature before heating of the test piece and before application of force 3.2 percentage elongation after fracture A permanent elongation at room temperature of the gauge length after fracture (Lu Lo), expressed as a percentage of the original gauge length (Lo) NOTE For further deta
37、ils, see ISO 6892-1:2009. 3.3 extensometer gauge length Lelength within the parallel portion of the test piece used for the measurement of extension by means of an extensometer 3.4 extension increase in the extensometer gauge length (Le) at a given moment during the test 3.5 percentage extension ext
38、ension expressed as a percentage of the extensometer gauge length (Le) 3.6 percentage reduction of area Z maximum 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 Suare calculated from the dime
39、nsions at room temperature 3.7 stress R force at any moment during the test divided by the original cross-sectional area (So) of the test piece NOTE All stresses referred to in this part of ISO 6892 are engineering stresses, calculated using the cross-sectional area of the test piece derived from di
40、mensions measured at room temperature. 3.8 soaking time tstime taken to stabilize the temperature of the test piece prior to mechanical loading 4 Symbols and designations ISO 6892-1:2009, Table 1 provides an extensive listing of symbols and their related designations. The additional symbols used in
41、this part of ISO 6892 are given in Table 1. BS EN ISO 6892-2:2011ISO 6892-2:2011(E) ISO 2011 All rights reserved 3Table 1 Symbols and designations Symbol Unit Designation T C specified temperature or nominal temperature at which the test should be performed TiC indicated temperature or measured temp
42、erature on the surface of the parallel length of the test piecetsmin soaking time 5 Principle The 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, wh
43、ich means at temperatures higher than room temperature as specified in ISO 6892-1. 6 Test piece For 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
44、 concerning determination of the original cross-sectional area, see 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, C
45、lause 8. 9 Apparatus 9.1 Force-measuring system The force-measuring system of the testing machine shall be calibrated in accordance with ISO 7500-1, class 1, or better. 9.2 Extensometer For the determination of proof strength (plastic or total extension), the used extensometer shall be in accordance
46、 with ISO 9513, class 1 or better, in the relevant range. For other properties (with higher extension) an ISO 9513 class 2 extensometer in the relevant range may be used. The extensometer gauge length shall be not less than 10 mm and shall correspond to the central portion of the parallel length. An
47、y part of the extensometer projecting beyond the furnace shall be designed or protected from draughts so that fluctuations in the room temperature have only a minimal effect on the readings. It is advisable to maintain reasonable stability of the temperature and speed of the air surrounding the test
48、ing machine. BS EN ISO 6892-2:2011ISO 6892-2:2011(E) 4 ISO 2011 All rights reserved9.3 Heating device 9.3.1 Permitted deviations of temperature The heating device for the test piece shall be such that the test piece can be heated to the specified temperature T. The indicated temperatures Tiare the t
49、emperatures measured on the surface of the parallel length of the test piece with corrections applied for any known systematic errors, but with no consideration of the uncertainty of the temperature measurement equipment. The permitted deviations between the specified temperature T and the indicated temperatures Ti, and the maximum permissible temperature variation along the test piece, are given in Table 2. For specified temperatures greater than 1 100 C, the permitted deviations shall be de
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