ASTM_A_1080_-_15.pdf

Designation:A108015Standard Practice forHot Isostatic Pressing of Steel,Stainless Steel,and RelatedAlloy Castings1This standard is issued under the fixed designation A1080;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers general requirements for Hot Iso-static Pressing(HIP)of steel,stainless steel,and related alloycastings.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A703 SpecificationforSteelCastings,GeneralRequirements,for Pressure-Containing PartsA781 Specification for Castings,Steel and Alloy,CommonRequirements,for General Industrial UseA957 Specification for Investment Castings,Steel andAlloy,Common Requirements,for General Industrial UseA985 Specification for Steel Investment Castings GeneralRequirements,for Pressure-Containing PartsE220 Test Method for Calibration of Thermocouples ByComparison Techniques2.2 AMS Standards:3AMS 2750 Pyrometry3.Terminology3.1 Definitions:3.1.1 autoclave,na pressure-containing vessel used in theHIP process.3.1.2 hot isostatic pressing(HIP),na solid state processwhich applies heat and pressure simultaneously to objects in anautoclave via an inert gas in such a way as to eliminate internalvoids and obtain desired properties.3.1.3 inert gas,na nonoxidizing gas used for pressurizinga HIP vessel.4.Ordering Information4.1 The authorization or requirement for hot isostatic press-ing(HIP)shall be agreed upon between purchaser and supplierand must be documented.4.1.1 The Supplementary Requirements of the CommonRequirements Specifications contain a section for authorizationof hot isostatic pressing(HIP)of castings.These CommonRequirements Specifications include,but are not limited to:A703 Specification for Steel Castings,General Requirements,for Pressure-Containing PartsA781 Specification for Castings,Steel and Alloy,Common Requirements,forGeneral Industrial UseA957 Specification for Investment Castings,Steel and Alloy,CommonRequirements,for General Industrial UseA985 Specification for Steel Investment Castings General Requirements,forPressure-Containing Parts4.2 The HIP processing parameters shall be as agreed uponbetween the purchaser and supplier.5.Quality Requirements5.1 The HIP process shall at a minimum document and havetraceability for:5.1.1 Operating parameters for each autoclave/vessel usedin production.5.1.2 Software and instrumentation used for control anddocumentation purposes.5.1.3 Gas used to backfill or quench.5.1.4 Contact fixturing within the autoclave.5.2 Methods of gas dilution,replenishment,reuse,andpurification shall be documented in a written procedure.5.3 Fixtures,plates,trays,spacers,hangers,containers andbaskets shall be made of a material compatible with the parts1This practice is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloys and is the direct responsibility of SubcommitteeA01.18 on Castings.Current edition approved March 1,2015.Published March 2015.Originallyapproved in 2012.Last previous edition approved in 2014 as A1080 14.DOI:10.1520/A108015.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from SAE International(SAE),400 Commonwealth Dr.,Warrendale,PA 15096-0001,http:/www.sae.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 to be treated or shall be adequately isolated to assure thatundesirable reactions,product contamination and distortionsdo not occur.5.4 Prior to pressurization,adequate care shall be taken toensure that no product contamination occurs.6.Autoclave Type/Qualification6.1 Autoclave shall consist of inert gas pressurization,internally heated cold wall pressure vessel type.6.2 Unless otherwise specified,the selection and type ofinert gas shall be at the discretion of the HIP processor.6.3 When argon is used,the gas emanating from theautoclave prior to hot isostatic pressing shall be a minimum of99.98%by volume(200 ppm total impurities)as determined byonline gas analysis and shall not exceed the requirementsspecified in Table 1.6.4 When a gas other than argon is used,the type and puritylevel shall be agree