1、Designation:A242/A242M13American Association StateHighway and Transportation OfficialsStandard AASHTO No.:M 161Standard Specification forHigh-Strength Low-Alloy Structural Steel1This standard is issued under the fixed designation A242/A242M;the number immediately following the designation indicates
2、the yearof original 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.This standard has been approved for use by agencies of the Depart
3、ment of Defense.1.Scope*1.1 This specification covers high-strength low-alloy struc-tural steel shapes,plates,and bars for welded,riveted,or boltedconstruction intended primarily for use as structural memberswhere savings in weight mass or added durability areimportant.The atmospheric corrosion resi
4、stance of the steel inmost environments is substantially better than that of carbonstructural steels with or without copper addition.When prop-erly exposed to the atmosphere,this steel can be used bare(unpainted)for many applications(see Note 1).This specifi-cation is limited to material up to 4 in.
5、100 mm,inclusive,inthickness.NOTE1For methods of estimating the atmospheric corrosion resis-tance of low-alloy steels,see Guide G101.1.2 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 X
6、3 of Specifica-tion A6/A6M for information on weldability.1.3 The values stated in either inch-pound units or SI unitsare to be regarded as standard.Within the text,the SI units areshown in brackets.The values stated in each system are notexact equivalents;therefore,each system must be used inde-pen
7、dently of the other.Combining values from the two systemsmay result in nonconformance with the specification.1.4 For structural products produced from coil and fur-nished without heat treatment or with stress relieving only,theadditional requirements,including additional testing require-ments and th
8、e reporting of additional test results,of Specifi-cation A6/A6M apply.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingG101 Guide for Estimating the Atmospheric Corrosion Re-sistance of Low-Alloy Ste
9、els3.General Requirements for Delivery3.1 Structural products furnished under this specificationshall conform to the requirements of the current edition ofSpecification A6/A6M,for the specific structural productordered,unless a conflict exists,in which case this specificationshall prevail.3.2 Coils
10、are excluded from qualification to this specifica-tion until they are processed into a finished structural product.Structural products produced from coil means structural prod-ucts that have been cut to individual lengths from a coil.Theprocessor directly controls,or is responsible for,the operation
11、sinvolved in the processing of a coil into a finished structuralproduct.Such operations include decoiling,leveling orstraightening,hot-forming or cold-forming(if applicable),cutting to length,testing,inspection,conditioning,heat treat-ment(if applicable),packaging,marking,loading for shipment,and ce
12、rtification.NOTE2For structural products produced from coil and furnishedwithout heat treatment or with stress relieving only,two test results are tobe reported for each qualifying coil.Additional requirements regardingstructural products produced from coil are described in SpecificationA6/A6M.4.Mat
13、erials and Manufacture4.1 The steel shall be killed.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 Steel for Bridges,Buildings,Rolling Stock and Ships.Current edition
14、 approved May 1,2013.Published June 2013.Originallyapproved in 1941.Last previous edition approved in 2009 as A242/A242M 04(2009).DOI:10.1520/A0242_A0242M-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMS
15、tandards 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 Conshohocken,PA 19428-2959.United States1Copyright by ASTM Intl(all rights
16、reserved);5.Chemical Composition5.1 The heat analysis shall conform to the requirementsprescribed in Table 2.5.2 The steel shall conform on product analysis to therequirements prescribed in Table 2,subject to the productanalysis tolerances in Specification A6/A6M.5.3 Choice and use of alloying elements,combined withcarbon,manganese,phosphorus,sulfur,and copper within thelimits prescribed in 5.1 to give the mechanical propertiesprescribed in Section 6 and to provide the atmospheric corro-sion res
