Designation:A290/A290M−16StandardSpecificationforCarbonandAlloySteelForgingsforRingsforReductionGears1ThisstandardisissuedunderthefixeddesignationA290/A290M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversnormalizedandtempered,andquenchedandtempered,carbonandalloysteelforgedorrolledringsforreductiongears.1.2Severalgradesandclassesofsteelarecoveredasfollows:1.2.1Grade1,ClassesAandB,andGrade2,ClassesCandD,arecarbonsteel.1.2.2Grade3,ClassesEandF,Grade4,ClassesG,H,I,J,KandL,Grade5,ClassesMandP,andGrade6,ClassT,arealloysteel.1.2.3Allgradesandclassesareconsideredweldableunderproperconditions.Weldingtechniquesareoffundamentalimportanceanditispre-supposedthatweldingprocedureandinspectionwillbeinaccordancewithpropermethodsfortheclassofmaterialused.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2A275/A275MPracticeforMagneticParticleExaminationofSteelForgingsA370TestMethodsandDefinitionsforMechanicalTestingofSteelProductsA388/A388MPracticeforUltrasonicExaminationofSteelForgingsA788/A788MSpecificationforSteelForgings,GeneralRe-quirements3.Terminology3.1DefinitionsofthetermsusedmaybefoundinSpecifi-cationA788/A788M.4.OrderingInformationandGeneralRequirements4.1InadditiontotheorderinginformationrequiredbySpecificationA788/A788M,thepurchasershallspe...
