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ASTM A1080 - 15.pdf

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ASTM A1080 - 15.pdf

Designation A1080 − 15Standard 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 Standards2A703 Specification for Steel Castings, 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 Standards3AMS 2750 Pyrometry3. Terminology3.1 Definitions3.1.1 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 toA703 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 for5.1.1 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. DOI10.1520/A1080–15.2For 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 standard’s 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 States1to 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 agreed upon by the purchaser and supplier priorto processing.7. Temperature Uniformity7.1 A temperature uniformity survey shall be conducted at a6 month maximum interval on each HIP unit using a typicalproduction load of parts or material under typical operatingparameters.7.2 Aminimum of two thermocouples for each heating zonein the working volume of the HIP unit shall be used fordetermining temperature uniformity, one positioned at thecenterline and the other at the outside diameter of the heatingzone. More than two thermocouples may be used if desired.7.3 For production HIP cycles, when approaching thermalequilibrium none of the load monitoring thermocouple read-ings shall exceed the selected control temperature by more thanthe allowable tolerance as specified by the purchaser. Afterreaching thermal equilibrium temperature variation of any loadmonitoring thermocouple shall not vary more than the allow-able tolerance as specified by the purchaser.8. Temperature Measurement and Control8.1 Temperature measuring devices shall be provided forthe autoclave. A permanent record of temperature during theentire cycle shall be maintained.8.2 Temperature uniformity measurements shall be madeusing thermocouples calibrated to ASTM E220 or AMS 2750.8.3 The accuracy of each instrument shall be determined byusing the equipment manufacturer’s recommendations.8.4 The temperature control system shall have an accuracyof 60.5 of the maximum operating temperature over theentire operating temperature range.8.5 After initial qualification, each instrument’s calibrationshall be verified at an interval of at least every 90 days.9. Pressure Measurement and Control9.1 Pressure measurement shall be made using sensorscalibrated in accordance with the equipment manufacturer’srecommendations.9.2 The equipment’s performance shall be within the limitssupplied by the manufacturer.9.3 After initial qualification, each instrument shall bere-qualified at a yearly interval.9.4 Pressure levels shall be monitored and maintained asfollows9.4.1 A minimum of one pressure sensor shall be used tomonitor the pressure of the working zone.9.4.2 Pressure readings from each sensor shall be recordedduring heat-up and temperature hold at intervals not to exceedfive minutes per sensor.10. Gas Measurement10.1 Gas purity as described in 6.3 shall be determined byuse of gas chromatographic analysis or other suitable methodsthat have been agreed upon between the purchaser and sup-plier.10.2 Frequency of gas analysis shall be performed as agreedupon between the purchaser and supplier.11. Keywords11.1 HIP; HIPP’ing; Densification; Shrinkage; Porosity;Hot Isostatic PressingTABLE 1 Argon Gas Purity RequirementsImpurity Element Maximum by Volume ppm vol/volNitrogen 0.005 50Hydrogen 0.0125 125Oxygen 0.0025 25Hydrocarbonsas methane, CH40.0025 25Total 0.020 200Dewpoint H2O -45CA1080 − 152SUMMARY OF CHANGESCommittee A01 has identified the location of selected changes to this standard since the last issue A1080 –14 that may impact the use of this standard. Approved March 1, 2015.1 Change Paragraph 4, “Significance and Use,” to “OrderingInformation.”2 Delete Paragraph 4.3.Committee A01 has identified the location of selected changes to this standard since the last issue A1080 –12 that may impact the use of this standard. Approved June 1, 2014.1 Revised 10.1 to allow alternate forms of gas analysistechniques.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 phone, 610-832-9555 fax, or serviceastm.org e-mail; or through the ASTM websitewww.astm.org. Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel 978 646-2600; http//www.copyright.com/A1080 − 153

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