1、This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(
2、TBT)Committee.Designation:A370-19NTERNATIONALStandard Test Methods and Definitions forMechanical Testing of Steel Products1This standard is issued under the fixed designation A370;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the y
3、ear of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.5 When this document is referen
4、ced in a metric product1.1 These test methods2 cover procedures and definitionsspecification,the yield and tensile values may be determined infor the mechanical testing of steels,stainless steels,and relatedinch-pound(ksi)units then converted into SI(MPa)units.Thealloys.The various mechanical tests
5、herein described are usedelongation determined in inch-pound gauge lengths of 2 orto determine properties required in the product specifications.8 in.may be reported in SI unit gauge lengths of 50 or 200 mm,Variations in testing methods are to be avoided,and standardrespectively,as applicable.Conver
6、sely,when this document ismethods of testing are to be followed to obtain reproduciblereferenced in an inch-pound product specification,the yieldand comparable results.In those cases in which the testingand tensile values may be determined in SI units then con-requirements for certain products are u
7、nique or at variance withverted into inch-pound units.The elongation determined in SIthese general procedures,the product specification testingunit gauge lengths of 50 or 200 mm may be reported inrequirements shall control.inch-pound gauge lengths of 2 or 8 in.,respectively,asapplicable.1.2 The foll
8、owing mechanical tests are described:1.5.1 The specimen used to determine the original unitsSectionsmust conform to the applicable tolerances of the original unitTension6to14Bend15system given in the dimension table not that of the convertedHardness16tolerance dimensions.Brinell17Rockwell18NorE 1-Th
9、is is due to the specimen SI dimensions and tolerancesPortable19being hard conversions when this is not a dual standard.The user isImpact20to30directed to Test Methods A1058 if the tests are required in SI units.Keywords321.6 Attention is directed to ISO/IEC 17025 when there may1.3 Annexes covering
10、details peculiar to certain productsbe a need for information on criteria for evaluation of testingare appended to these test methods as follows:laboratories.AnnexBar ProductsAnnex A11.7 This standard does not purport to address all of theTubular ProductsAnnex A2safery concerns,if any,associated wit
11、h its use.It is theFastenersAnnex A3Round Wire ProductsAnnex A4responsibility of the user of this standard to establish appro-Significance of Notched-Bar Impact TestingAnnex A5priate safety,health,and environmental practices and deter-Converting Percentage Elongation of Round Specimens toAnnex A6min
12、e the applicability of regulatory limitations prior to use.Equivalents for Flat SpecimensTesting Multi-Wire StrandAnnex A71.8 This international standard was developed in accor-Rounding of Test DataAnnex A8dance with internationally recognized principles on standard-Methods for Testing Steel Reinfor
13、cing BarsAnnex A9ization established in the Decision on Principles for theProcedure for Use and Control of Heat-Cycle SimulationAnnex A10Development of International Standards,Guides and Recom-1.4 The values stated in inch-pound units are to be regardedmendations issued by the World Trade Organizati
14、on Technicalas the standard.Barriers to Trade(TBT)Committee.2.Referenced DocumentsThese test methods and definitions are under the jurisdiction of ASTM2.1 ASTM Standards:3Committee A0l on Steel,Stainless Steel and Related Alloys and are the directA623 Specification for Tin Mill Products,General Requ
15、ire-responsibility of Subcommittee A01.13 on Mechanical and Chemical Testing andmentsProcessing Methods of Steel Products and Processes.Current edition approved July 1.2019.Published July 2019.Originally approvedin 1953.Last previous edition approved in 2018 as A370-18.DOI:10.15203 For referenced AS
16、TM standards,visit the ASTM website,www.astm.org.orA0370-19.contact ASTM Customer Service at serviceastm.org.For Annual Book of A.STM2 For ASME Boiler and Pressure Vessel Code applications see related Specifi-Standards volume information,refer to the standards Document Summary page oncation SA-370 i
17、n Section II of that Code.the ASTM website.*A Summary of Changes section appears at the end of this standard4A370-19TangentialProlongationTestProlongationLongitudinal TestRadial Test(a)Shafts and RotorsProlongationangentialTestLongitudinal Test(b)Hollow ForgingsProlongationProlongationTangential Tes
18、tTangential Test(c)Disk Forgings-ProlongationProlongationTangential Test(d)Ring ForgingsTangential TestFIG.2 Location of Longitudinal Tension Test Specimens in Rings Cut from Tubular Productsseparation of the heads shall not exceed in.per min per inchHowever,the minimum rate of stressing shall not b
19、e less thanof reduced section,or the distance between the grips for test10 000 psi(70 MPa)/min.specimens not having reduced sections.In any event,theminimum speed of testing shall not be less than o the9.Test Specimen Parametersspecified maximum rates for determining yield point or yield9.1 Selectio
20、n-Test coupons shall be selected in accordancestrength and tensile strength.with the applicable product specifications.8.4.2 It shall be permissible to set the speed of the testing9.1.1 Wrought Steels-Wrought steel products are usuallymachine by adjusting the free running crosshead speed to theteste
21、d in the longitudinal direction,but in some cases,whereabove specified values,inasmuch as the rate of separation ofsize permits and the service justifies it,testing is in theheads under load at these machine settings is less than thetransverse,radial,or tangential directions(see Figs.I and 2).specif
22、ied values of free running crosshead speed.9.1.2 Forged Steels-For open die forgings,the metal for8.4.3 As an alternative,if the machine is equipped with atension testing is usually provided by allowing extensions ordevice to indicate the rate of loading,the speed of the machineprolongations on one
23、or both ends of the forgings,either on allfrom half the specified yield point or yield strength through theor a representative number as provided by the applicableyield point or yield strength may be adjusted so that the rate ofproduct specifications.Test specimens are normally taken atstressing does not exceed 100 000 psi(690 MPa)/min.mid-radius.Certain product specifications permit the use of a4