ASTM_A_945_-_A_945M_-_16.pdf

Designation:A945/A945M16Standard Specification forHigh-Strength Low-Alloy Structural Steel Plate with LowCarbon and Restricted Sulfur for Improved Weldability,Formability,and Toughness1This standard is issued under the fixed designation A945/A945M;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.Scope*1.1 This specification covers high-strength low-alloy struc-tural steel plate intended for use in welded construction ofnaval ships where a savings in weight mass is important.Plates that conform to this specification offer improvedweldability,formability,and toughness resulting from thespecified alloying elements with limitations on carbon,sulfur,and residual element contents.Grades 50 and 65 may beprovided as-rolled,control-rolled,thermo-mechanical controlprocessed(including accelerated cooling),normalized,orquenched and tempered as required to meet the specifiedmechanical requirements.1.2 The maximum thickness or weight mass of plates shallbe as follows:GradePlate thickness,max,in.mmPlate weight mass,max,lb/ft2kg/m2502 5081.7 3936521265102 5021.3 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 utilized.1.4 The values stated in either inch-pound units or SI unitsare to be regarded separately as standard.Within the text the SIunits are shown in brackets.The values stated in each systemare not exact equivalents,therefore,each system is to be usedindependently of the other without combining values in anyway.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 ProductsA673/A673M Specification for Sampling Procedure for Im-pact Testing of Structural SteelA700 Guide for Packaging,Marking,and Loading Methodsfor Steel Products for ShipmentE208 Test Method for Conducting Drop-Weight Test toDetermine Nil-Ductility Transition Temperature of Fer-ritic Steels3.General Requirements for Delivery3.1 Plates furnished under this specification shall conformto the applicable requirements of the current edition of Speci-fication A6/A6M.3.2 If specified in the purchase order,plates ordered underthis specification shall be prepared for shipment in accordancewith the requirements of the current edition of SpecificationA700.4.Materials and Manufacture4.1 The steel shall be made to fine grain practice.4.2 Grade 65 plates less than 1 in.25 mm in thicknessshall be provided from continuously cast product.4.3 Except as specified in 5.1 and 5.2,the plates afterfinish-rolling shall be in one of the following conditions:as-rolled,control-rolled,or thermo-mechanical control pro-cessed(including accelerated cooling).5.Heat Treatment5.1 Grade 50 plates and Grade 65 plates are normally fur-nished without heat treatment.The manufacturer has the optionto normalize or quench and temper such plates to meet themechanical requirements of Section 7 provided that the heattreatment is reported on the test report.5.2 Grade 65 plates greater than 114in.32 mm in thick-ness shall be furnished in the quenched and tempered heattreatment.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is under the direct responsibility ofSubcommittee A01.02 on Structural Steel for Bridges,Buildings,Rolling Stock andShips.Current edition approved Sept.1,2016.Published September 2016.Originallyapproved in 1995.Last previous edition approved in 2011 as A945/A945M 06(2011).DOI:10.1520/A0945_A0945M-16.2For 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.*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 6.Chemical Composition6.1 The heat analysis shall conform to the requirementsgiven in Table 1.6.2 If a product analysis is made,it shall conform to therequirements given in Table 1,subject to the product analysistolerances in Specification A6/A6M.7.Mechanical Properties7.1 Tensile Properties:7.1.1 The plates as represented by the test specimens shallconform to the tensile properties given in Table 2 for theapplicable grade.7.1.2 For quenched and tempered plates,one tension testshall be taken from a corner of each plate as heat treated.7.1.3 If measured on a 112-in.40-mm wide specimen(seeFig.3 of Test Methods and Definitions A370),the elongationmay be determined in a 2-in.50-mm gage length thatincludes the fracture and shows the