Designation:B998−17StandardGuideforHotIsostaticPressing(HIP)ofAluminumAlloyCastings1ThisstandardisissuedunderthefixeddesignationB998;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguidepresentsrequirementsforhotisostaticpress-ing(HIP)ofaluminumalloycastings.HIPingisaprocessinwhichcomponentsaresubjectedtothesimultaneousapplica-tionofheatandhighpressureinaninertgasmedium.Theprocessistobeusedforthereductionofinternal(non-surfaceconnected)porosity.ThedocumentistodescribethegeneralparametersoftheHIPprocess,describecertificationproce-duresandadescriptionthattheprocesshasbeenfollowed.Itisnotintendedtobeadescriptionofaheattreatingprocedure.Thisisnotmeanttosupersedeanenduser’sspecificationwhereoneexists.21.2Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1Thefollowingdocumentsoftheissueineffectonthedateofcastingpurchaseformapartofthispracticetotheextentreferencedherein:2.2ASTMStandards:E230/E230MSpecificationforTemperature-ElectromotiveForce(emf)TablesforStandardizedThermocouples2.3AMSStandar...
