1、Designation:A913/A913M15Standard Specification forHigh-Strength Low-Alloy Steel Shapes of Structural Quality,Produced by Quenching and Self-Tempering Process(QST)1This standard is issued under the fixed designation A913/A913M;the number immediately following the designation indicates the yearof orig
2、inal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers high-strength low-alloy struc-tural steel
3、shapes in Grades 50 345,60 415,65 450 and 70485,produced by the quenching and self-tempering process(QST).The shapes are intended for riveted,bolted or weldedconstruction of bridges,buildings and other structures.1.2 The QST process consists of in line heat treatment andcooling rate controls which r
4、esult in mechanical properties inthe finished condition that are equivalent to those attainedusing heat treating processes which entail reheating afterrolling.A description of the QST process is given in AppendixX1.1.3 Due to the inherent characteristics of the QST process,the shapes shall not be fo
5、rmed and post weld heat treated attemperatures exceeding 1100F 600C.1.4 When the steel is to be welded,it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be utilized.See Appendix X3 of Specifica-tion A6/A6M for information on weldability.1.5 The
6、 values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text,theSI units are shown in brackets.The values stated in eachsystem are not exact equivalents;therefore,each system mustbe used independently of the other.Combining values from thetwo systems
7、 may result in nonconformance with this specifi-cation.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingA673/A673M Specification for Sampling Procedure for Im-pact Testing of Structural SteelA898/A89
8、8M Specification for Straight Beam UltrasonicExamination of Rolled Steel Structural Shapes3.General Requirements for Delivery3.1 Material furnished under this specification shall con-form to the applicable requirements of the current edition ofSpecification A6/A6M.4.Materials and Manufacture4.1 The
9、shapes shall be produced by the quenching andself-tempering process(QST).Following rapid quenching toachieve a surface temperature below the martensite starttemperature,Ms,the shapes shall be allowed to auto-temper toa self-tempering temperature(STT)that shall be 1100F595C minimum and 1300F 705C max
10、imum.The STTshall be reported on the mill test report.4.2 For grades 60 415,65 450,and 70 485,therequirements for fine austenitic grain size in SpecificationA6/A6M shall be met.5.Chemical Composition5.1 The chemical analysis of the heat shall conform to therequirements prescribed in Table 1.5.2 The
11、steel shall conform on product analysis to therequirements prescribed in Table 1 subject to the productanalysis tolerances in Specification A6/A6M.6.Mechanical Properties6.1 Tensile PropertiesThe material as represented by thetest specimens shall conform to the tensile properties given inTable 2.6.2
12、 Charpy V-notch tests shall be made in accordance withSpecification A673/A673M,Frequency H:6.2.1 The test results of full-size specimens shall meet anaverage value of 40 ft-lbf 54 J at 70F 21C.6.2.1.1 Test reports for every heat supplied are required.6.2.2 Charpy V-notch test requirements exceeding
13、the valuespecified in 6.2.1 or lower test temperatures are subject toagreement between the purchaser and the producer.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.02 on Structural S
14、teel for Bridges,Buildings,Rolling Stock and Ships.Current edition approved July 1,2015.Published August 2015.Originallyapproved in 1993.Last previous edition approved in 2014 as A913/A913M 14a.DOI:10.1520/A0913_A0913M-15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact A
15、STM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocke
16、n,PA 19428-2959.United States1 7.Maximum Carbon Equivalent Requirement7.1 The carbon equivalent on heat analysis shall not exceedthe limits listed in this section.The chemical analysis(heatanalysis)of the elements that appear in the carbon equivalentformula and the actual carbon equivalent shall be reported.Carbon equivalent limitsGrade 50 345:0.38%Grade 60 415:0.40%Grade 65 450:0.43%Grade 70 485:0.45%7.2 Calculate the carbon equivalent using the followingequation:CE 5 C1Mn/61Cr1Mo1V!/51Cu1Ni!/1
