Designation:A504/A504M−14StandardSpecificationforWroughtCarbonSteelWheels1ThisstandardisissuedunderthefixeddesignationA504/A504M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversone-wear,two-wear,andmultiple-wearwroughtcarbonsteelwheelsforlocomotivesandcars,designatedClassesL,A,B,andC,heat-treated,wheels.1.2Theserviceforwhichthevariousclassesareintendedisasfollows:1.2.1ClassBorCwheelsshallbeusedforfreightcarsininterchangeservice.1.2.2ClassBorCwheelsarerecommendedforuseonlocomotives.1.2.3Forpassengercarservice,thevariousclassesareintendedgenerallyasfollows:1.2.3.1ClassL—Highspeedwithmoreseverebrakingconditionsthanotherclassesandlightwheelloads.1.2.3.2ClassA—Highspeedwithmoreseverebrakingconditions,butmoderatewheelloads.1.2.3.3ClassB—Highspeedservicewithseverebrakingconditionsandheavierwheelloads.1.2.3.4ClassC—(1)Servicewithlightbrakingconditionsandheavierwheelloads.1.2.3.5ClassC—(2)Servicewithheavierbrakingcondi-tionswhereoff-treadbrakesareemployed.1.3Supplementalrequirementsareprovidedforusewhereadditionaltestingoradditionalrestrictionsarerequiredbythepurchaser.SupplementaryrequirementsincludedinSpecifica-tionA788/A788Mmayalsobespecifiedbythepurchaserforforgingsorderedtothisspecification.Anysupplementalre-quirementsapplyonlywhenspecifiedinthepurchaseorder.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetextandtables,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththestandard.1.5Unlesstheorderspecifiestheapplicable“M”specifica-tiondesignation,thematerialshallbefurnishedtotheinch-poundunits.1.6Thisstandarddoesnotpurporttoaddres...
