ASTM_A_678_-_A_678M_-_05_2009.pdf

Designation:A678/A678M 05(Reapproved 2009)Standard Specification forQuenched-and-Tempered Carbon and High-Strength Low-Alloy Structural Steel Plates1This standard is issued under the fixed designation A678/A678M;the number immediately following the designation indicates 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.1.Scope1.1 This specification covers quenched-and-tempered car-bon steel and high-strength low-alloy steel plates of structuralquality for welded,riveted,or bolted construction.1.2 If the steel is to be welded,it is presupposed that awelding procedure suitable for the grade of steel and intendeduse or service will be used.1.3 Plates under this specification are available in fourgrades as follows:GradeYieldStrength,min,ksiMPaTensile Strength,ksi MPaMaximumThickness,in.mmA50 3457090 48562011240B60 41580100 55069021265CAA2 50D75 51590110 6207603 75AVaries with thickness.See Table 1.1.4 The 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 is tobe used independently of the other.2.Referenced Documents2.1 ASTM Standards:2A6/A6M Specification for General Requirements for RolledStructural Steel Bars,Plates,Shapes,and Sheet PilingA370 Test Methods and Definitions for Mechanical Testingof Steel Products3.General Requirements for Delivery3.1 Plates furnished under this specification shall conformto the applicable requirements of the current edition of Speci-fication A6/A6M unless a conflict exists,in which case thisspecification shall prevail.4.Materials and Manufacture4.1 The requirements for fine austenitic grain size in Speci-fication A6/A6M shall be met.5.Heat Treatment5.1 The plates shall be heat treated by heating to a tempera-ture that produces an austenitic structure,but not exceeding1700F 925C,holding a sufficient time to attain uniformheat throughout the material,quenching in a suitable medium,and tempering at not less than 1100F 593C.The heat-treatment temperatures shall be reported in the test report.6.Chemical Composition6.1 The heat analysis shall conform to the requirementsgiven in Table 2 for the applicable grade.6.2 The product analysis shall conform to the requirementsgiven in Table 2,subject to the product analysis tolerances inSpecification A6/A6M.7.Tension Test7.1 The plates as represented by the test specimens shallconform to the requirements given in Table 1 specified for theapplicable grade.7.2 Number of TestsOne tension test shall be taken froma corner of each plate as heat treated.8.Keywords8.1 bolted construction;carbon;high-strength;low-alloy;plates;quenched;steel;structural steel;tempered;weldedconstruction1This 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 approved Oct.1,2009.Published December 2009.Originallyapproved in 1973.Last previous edition approved in 2005 as A678/A678M 05.DOI:10.1520/A0678_A0678M-05R09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.NOTICE:This standard has either been superseded and replaced by a new version or withdrawn.Contact ASTM International(www.astm.org)for the latest information SUPPLEMENTARY REQUIREMENTSSupplementary requirements shall not apply unless specified in the purchase order or contract.Standardized supplementary requirements for use at the option of the purchaser are listed inSpecification A6/A6M.Those that are considered suitable for use with this specification are listed inthis section by title.S5.Charpy V-Notch Impact TestTABLE 1Mechanical RequirementsAGrade AGrade BGrade CGrade DYield strengthB,min.ksi MPaTo34in.20 mm,incl50 34560 41575 51575 515Over34to 112in.20 to 40 mm,incl50 34560 41570 48575 515Over 112to 2 in.40 to 50 mm,inclC60 41565 45075 515Over 2 to 212in.50 to 65 mm,inclC60 415C75 515Over 212to 3 in.65 to 75 mm,inclCCC75 515Tensile strength,ksi MPaTo34in.20 mm,incl7090 48562080100 55069095115 65579090110 620760Over34to 112in.20 to 40 mm,incl7090 48562080100 55069090110 62076090110 620760Over 112to 2 in.40 to 50 mm,inclC80100 55069085105 58572090110 620760Over 2 to 212in.50 to 65 mm,inclC80100 550690C90110 620760Over 212to 3 in.65 to 75 mm,inclCCC90110 620760Elongation in 2 in.50 mm,min,%DE22221918ASee Specimen Orientation under the Tension Tests section of Specification A6/A6M.