1、Designation:A1008/A1008M16Standard Specification forSteel,Sheet,Cold-Rolled,Carbon,Structural,High-StrengthLow-Alloy,High-Strength Low-Alloy with ImprovedFormability,Solution Hardened,and Bake Hardenable1This standard is issued under the fixed designation A1008/A1008M;the number immediately followin
2、g the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for us
3、e by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers cold-rolled,carbon,structural,high-strength low-alloy,high-strength low-alloy with im-proved formability,solution hardened,and bake hardenablesteel sheet,in coils and cut lengths.1.2 Cold rolled steel sheet is avail
4、able in the designations aslisted in 4.1.1.3 This specification does not apply to steel strip asdescribed in Specification A109/A109M.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;the
5、refore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.2.Referenced Documents2.1 ASTM Standards:2A109/A109M Specification for Steel,Strip,Carbon(0.25Maximum Percent),Cold-RolledA370 Test Methods and Definitions f
6、or Mechanical Testingof Steel ProductsA568/A568M Specification for Steel,Sheet,Carbon,Structural,and High-Strength,Low-Alloy,Hot-Rolled andCold-Rolled,General Requirements forA941 Terminology Relating to Steel,Stainless Steel,RelatedAlloys,and FerroalloysE18 Test Methods for Rockwell Hardness of Met
7、allic Ma-terialsE517 Test Method for Plastic Strain Ratio r for Sheet MetalE646 Test Method for Tensile Strain-Hardening Exponents(n-Values)of Metallic Sheet Materials3.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 Fordefinitionsofothertermsusedinthisspecification,refer to Term
8、inology A941.3.1.2 aging,nloss of ductility with an increase inhardness,yield strength,and tensile strength that occurs whensteel that has been slightly cold worked(such as by temperrolling)is stored for some time.3.1.2.1 DiscussionAging increases the tendency of a steelto exhibit stretcher strains
9、and fluting.3.1.3 bake hardenable steel,nsteel in which significantaging is realized when moderate heat treatment,such as thatused for paint baking,follows straining or cold working.3.1.4 inclusion control,nthe process of reducing thevolume fraction of inclusions or modifying the shape ofinclusions
10、to improve formability,weldability,and machinabil-ity.3.1.4.1 DiscussionInclusions,especially those elongatedduring the rolling process,create the conditions for initiating orpropagating cracks,or both,when the material is stretched orbent during the manufacture of a part.The adverse effects ofinclu
11、sions are minimized by reducing the content of inclusionsin the steel or by altering the shape of inclusions,or both,through the use of additions during the steelmaking processthat change the elongated shape of the inclusions to lessharmful small,well dispersed globular inclusions.3.1.5 solid-soluti
12、on hardened steel or solution hardenedsteel,nsteel strengthened through additions of elements,suchas Mn,P,or Si,that can be dissolved within the crystallinestructure of steels.3.1.5.1 DiscussionAlloying elements that form a solid-solution with iron provide strengthening as a result of localdistortio
13、ns in atomic arrangements,which arise as a result ofthe mismatch between the atomic sizes of such elements andthat of iron.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.19 on Steel S
14、heet and Strip.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 2000.Last previous edition approved in 2015 as A1008/A1008M 15.DOI:10.1520/A1008_A1008M-16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servicea
15、stm.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 Conshohocken,PA 19428-2959.United States1 3
16、.1.6 stabilization,naddition of one or more nitride-orcarbide-forming elements,or both,such as titanium andcolumbium,to control the level of the interstitial elements ofcarbon and nitrogen in the steel.3.1.6.1 DiscussionStabilizing improves formability andincreases resistance to aging.3.1.7 vacuum degassing,nprocess of refining liquid steelin which the liquid is exposed to a vacuum as part of a specialtechnique for removing impurities or for decarburizing thesteel.3.1.8 Special Forming Steel(SFS
