ASTM A255-02 测定钢淬透性用末端淬火试验的标准试验方法

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1、AnAmericanNationalStandardDesignation:A255–02StandardTestMethodsfor1DeterminingHardenabilityofSteelThisstandardisissuedunderthe®xeddesignationA255;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicate

2、stheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope*2.ReferencedDocuments1.1Thesetestmethodscovertheidenti®cationanddescrip-2.1ASTMStandards:tionoftestmethodsfordeterm

3、iningthehardenabilityofsteels.E18TestMethodsforRockwellHardnessandRockwellThetwotestmethodsincludethequantitativeend-quenchorSuper®cialHardnessofMetallicMaterials2JominyTestandamethodforcalculatingthehardenabilityofE112TestMethodsforDeterminingtheAverageGrainsteelfromthechemicalcompositionbasedon

4、theoriginalworkSize2byM.A.Grossman.1.2Theselectionofthetestmethodtobeusedfordeter-END-QUENCHORJOMINYTESTminingthehardenabilityofagivensteelshallbeagreedupon3.Descriptionbetweenthesupplieranduser.TheCerti®edMaterialTest3.1ThistestmethodcoverstheprocedurefordeterminingReportshallstatethemethodofhar

5、denabilitydetermination.thehardenabilityofsteelbytheend-quenchorJominytest.The1.3Thecalculationmethoddescribedinthesetestmethodstestconsistsofwaterquenchingoneendofacylindricaltestisapplicableonlytotherangeofchemicalcompositionsthatspecimen1.0in.indiameterandmeasuringthehardeningfollow:responseas

6、afunctionofthedistancefromthequenchedend.ElementRange,%Carbon0.10–0.704.ApparatusManganese0.50–1.654.1SupportforTestSpecimenÐA®xtureforsupportingtheSilicon0.15–0.60Chromium1.35maxtestspecimenverticallysothatthelowerendofthespecimenNickel1.50maxisadistanceof0.5in.(12.7mm)abovetheori®ceoftheMolybde

7、num0.55maxwater-quenchingdevice.Asatisfactorytypeofsupportforthe1.4Hardenabilityisameasureofthedepthtowhichsteelstandard1.0-in.(25.4-mm)specimenisshowninFig.1.willhardenwhenquenchedfromitsaustenitizingtemperatureNOTE1Ð