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1、Designation:A747/A747M−12StandardSpeciÞcationfor1SteelCastings,Stainless,PrecipitationHardeningThisstandardisissuedunderthefixeddesignationA747/A747M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindic
2、atestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*2.ReferencedDocuments1.1Thisspecificationcoversiron-chromium-nickel-copper22.1ASTMStandards:corrosion-resistantsteelcastings,capableofbeingstrength-A370TestMethodsandDefinitionsforM
3、echanicalTestingenedbyprecipitationhardeningheattreatment.ofSteelProductsA781/A781MSpecificationforCastings,SteelandAlloy,1.2Thesecastingsmaybeusedinservicesrequiringcorro-CommonRequirements,forGeneralIndustrialUsesionresistanceandhighstrengthsattemperaturesupto600°FA957/A957MSpecificationforInves
4、tmentCastings,Steel[315°C].Theymaybemachinedinthesolution-annealedandAlloy,CommonRequirements,forGeneralIndustrialconditionandsubsequentlyprecipitationhardenedtothede-Usesiredhigh-strengthmechanicalpropertiesspecifiedinTable3S14.1withlittledangerofcrackingordistortion.2.2ASMEStandard:ASMEBoileran
5、dPressureVesselCode,Supplementary1.3Thematerialisnotintendedforuseinthesolution-RequirementsS6,S14,andS27annealedcondition.NOTE1—Iftheserviceenvironmentinwhichthematerialistobeused3.GeneralConditionsforDeliveryisconsideredconducivetostress-corrosioncracking,precipitationhard-eningshouldbeperform
6、edatatemperaturethatwillminimizethe3.1Exceptforinvestmentcastings,castingsfurnishedtosusceptibilityofthematerialtothistypeofattack.thisspecificationshallbeinaccordancewiththerequirements1.4SupplementaryrequirementsofanoptionalnatureareofSpecificationA781/A781M,includinganysupplementaryprovidedforu
7、seattheoptionofthepurchaser.TheSupple-requirementsthatareindicatedinthepurchaseorder.Failuretomentaryrequirementsshallapplyonlywhenspecifiedindi-complywiththegeneralrequirementsofSpecificationA781/viduallybythepurchaserinthepu
