ASTM_A_148_-_A_148M_-_15a.pdf

Designation:A148/A148M15aStandard Specification forSteel Castings,High Strength,for Structural Purposes1This standard is issued under the fixed designation A148/A148M;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers carbon steel,alloy steel,andmartensitic stainless steel castings that are to be subjected tohigher mechanical stresses than those covered in SpecificationA27/A27M.1.2 Several grades of steel castings are covered,having thechemical composition and mechanical properties prescribed inTables 1 and 2.1.3 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;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.3.1 Within the text,the SI units are shown in brackets.2.Referenced Documents2.1 ASTM Standards:2A27/A27M Specification for Steel Castings,Carbon,forGeneral ApplicationA370 Test Methods and Definitions for Mechanical Testingof Steel ProductsA781/A781M Specification for Castings,Steel and Alloy,Common Requirements,for General Industrial UseA957/A957M Specification for Investment Castings,Steeland Alloy,Common Requirements,for General IndustrialUseA1067/A1067M Specification for Test Coupons for SteelCastingsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.General Conditions for Delivery3.1 Except for castings produced by the investment castingprocess,material furnished to this specification shall conformto the requirements of Specification A781/A781M,includingany supplementary requirements that are indicated in thepurchase order.Failure to comply with the general require-ments of Specification A781/A781M constitutes nonconfor-mance with this specification.In case of conflict between therequirements of this specification and Specification A781/A781M,this specification shall prevail.3.2 Investment castings furnished to this specification shallconform to the requirements of Specification A957/A957M,including any supplementary requirements that are indicated inthe purchase order.Failure to comply with the general require-ments of Specification A957/A957M constitutes nonconfor-mance with this specification.In case of conflict between therequirements of this specification and Specification A957/A957M,Specification A957/A957M shall prevail.4.Ordering Information4.1 The inquiry and order should include or indicate thefollowing:4.1.1 A description of the casting by pattern number ordrawing(dimensional tolerances shall be included on thecasting drawing),4.1.2 Grade of steel,4.1.3 Options in the specification,and4.1.4 The supplementary requirements desired,includingthe standards of acceptance.4.1.5 In the case of quench and tempered castings the rulingsection,T.5.Heat Treatment5.1 All castings shall be heat treated either by full annealing,normalizing,normalizing and tempering,or quenching andtempering.Unless otherwise specified in the inquiry,contract,or order,the castings may be heat treated by any of these heattreatments or combination of these heat treatments at the optionof the manufacturer.5.2 Heat treatment shall be performed after the castingshave been allowed to cool below the transformation range.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 1955.Last previous edition approved in 2015 as A148/A148M 15.DOI:10.1520/A0148_A0148M-15A.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.Temperature Control6.1 Furnace temperatures for heat-treating shall be regulatedby the use of pyrometers.7.Chemical Composition7.1 The steel shall conform to sulfur and phosphorus re-quirements as prescribed in Table 1.7.2 The content of carbon,manganese,silicon,and alloyingelements may,by agreement,be prescribed by the purchaser.Ifnot specified,the content may be selected by the manufacturerto obtain the required mechanical properties.7.3 When the analysis of carbon,manganese,silicon,or anyintentionally added alloying element is specifically requestedi