ASTM_A_837_-_A_837M_-_06_2016.pdf

Designation:A837/A837M06(Reapproved 2016)Standard Specification forSteel Forgings,Alloy,for Carburizing Applications1This standard is issued under the fixed designation A837/A837M;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 alloy steel forgings for carbur-izing applications.1.2 Forgings are considered weldable under proper condi-tions.Welding technique is of fundamental importance and it ispresupposed that welding procedure and inspection shall be inaccordance with approved methods for the class of materialused.1.3 This specification is expressed in both inch-pound unitsand in SI units.However,unless the order specifies theapplicable M specification designation(SI units),the materialshall be furnished to inch-pound units.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;therefore,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:2A275/A275M Practice for Magnetic Particle Examination ofSteel ForgingsA388/A388M Practice for Ultrasonic Examination of SteelForgingsA788/A788M Specification for Steel Forgings,General Re-quirementsE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)3.Ordering Information3.1 Instructions for purchasing forgings to this specificationare to be in accordance with Specification A788/A788M.3.2 Inadditiontothebasicrequirementsofthisspecification,certain supplementary requirements are listed atthe end of this specification.These supplementary require-ments may be applicable when additional control,testing,orexamination is required to meet end use requirements.4.Heat Treatment4.1 The forgings shall be given a normalize or normalizeand temper heat treatment.5.Machining5.1 Rough machining before heat treatment may be per-formed at the option of the manufacturer.6.Chemical Composition6.1 The steel shall conform to the requirements for chemicalcomposition prescribed in Table 1 unless otherwise modified inaccordance with Supplementary Requirement S4.7.Mechanical Properties7.1 Hardness:7.1.1 Maximum hardness of the forgings shall be 229 BHN.7.1.2 Hardness tests shall be taken on prepared surfaces ofthe forging after machining to the purchasers ordering require-ments.7.1.3 Number and Location of Tests:7.1.3.1 For forgings not intended for gear applications,thenumber and location of hardness tests shall be by agreementbetween the purchaser and forger.7.1.3.2 For gear applications on each forging 8 in.200 mmand over in diameter,four Brinell hardness tests shall be madeon the outside surface of that portion of the forging on whichteeth will be cut two tests being made on each helix 180 apart,and the tests on the two helices shall be 90 apart.On eachforging under 8 in.200 mm in diameter two Brinell hardnesstests shall be made,one on each helix 180 apart.On hollow,cylindrical forgings,one hardness test on each end shall betaken 180 apart.Hardness tests shall be performed at thequarter-face width of the tooth-portion diameter.8.Other Requirements8.1 Forgings supplied to this material specification shallconform to the latest issue of Specification A788/A788M.1This specification is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved March 1,2016.Published April 2016.Originallyapproved in 1985.Last previous edition approved in 2011 as A837/A837M 06(2011).DOI:10.1520/A0837_A0837M-06R16.2For 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 8.2 Specification A788/A788M covers forging terminology,melting processes,chemical analysis test methods,productanalysis tolerances,mechanical testing methods,repair weld-ing restrictions,marking,and certification requirements.9.Keywords9.1 alloy steel forgings;carburizingSUPPLEMENTARY REQUIREMENTSThe following supplementary requirements shall apply only when specified by the purchaser on theorder and agreed to by the manufacturer.S1.Rough Turning and BoringS1.1 The position of rough turning and boring in thesequence of manufacturing operations is specified.S2.Magnetic Particle ExaminationS2.1 Magnetic particle examination shall be s