ASTM_B_91_-_17.pdf

Designation:B9117Standard Specification forMagnesium-Alloy Forgings1This standard is issued under the fixed designation B91;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers magnesium alloy forgingsdesignated as shown in Table 1.1.2 The values stated in inch-pound units are the standard.The SI values in parentheses are provided for information only.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 The following documents of the issue in effect on dateof material purchase form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B296 Practice for Temper Designations of MagnesiumAlloys,Cast and WroughtB557 Test Methods for Tension Testing Wrought and CastAluminum-and Magnesium-Alloy ProductsB660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB666 Practice for Identification Marking of Aluminum andMagnesium ProductsB951 Practice for Codification of Unalloyed Magnesium andMagnesium-Alloys,Cast and WroughtB953 Practice for Sampling Magnesium and MagnesiumAlloys for Spectrochemical AnalysisB954 Test Method for Analysis of Magnesium and Magne-sium Alloys by Atomic Emission SpectrometryE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE55 Practice for Sampling Wrought Nonferrous Metals andAlloys for Determination of Chemical Composition2.3 Federal Standards:FED-STD-123H Marking for Shipment(Civil Agencies)32.4 Military Standards:MIL-STD-129 Marking for Shipment and Storage(MilitaryAgencies)32.5 Aerospace Materials Specification:4AMS-M-3171 MagnesiumAlloy,Processes for Pretreatmentand Prevention of Corrosion on3.Terminology3.1 Definitions:3.1.1 forginga metal part worked to a predeterminedshape by one or more such processes as hammering,upsetting,pressing,or rolling.3.1.2 die forginga forging formed to the required shapeand size by working in impression dies.3.1.3 hammer forginga forging produced by repeatedblows in a forging hammer.3.1.4 hand forginga forging worked between flat or sim-ply shaped dies by repeated strokes or blows and manipulationof the piece.4.Ordering Information4.1 Orders for forgings under this specification shall includethe following information:4.1.1 Quantity of each forging,4.1.2 Alloy(Section 6 and Table 1),4.1.3 Temper(Section 7 and Table 2)in accordance with therequirements of Practice B296,4.1.4 Drawing showing dimensions of all die forgings andfor all hand forgings not simple disks,rounds,squares,orrectangles(the amount of stock left for machine finish shouldbe indicated),1This specification is under the jurisdiction of ASTM Committee B07 on LightMetals and Alloys and is the direct responsibility of Subcommittee B07.04 onMagnesium Alloy Cast and Wrought Products.Current edition approved May 1,2017.Published May 2017.Originallyapproved in 1932.Last previous edition approved in 2012 as B91 12.DOI:10.1520/B0091-17.2For 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 Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.4Available 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.1.5 Surface treatment(see 9.1),4.1.6 Whether inspection is required at the manufacturersworks(see 10.1),4.1.7 Special inspection requirements(see 10.2),4.1.8 Whether certification is required(see 12.1),and4.1.9 Whether marking for identification is required(see13.1).5.Quality Assurance5.1 The manufacturer shall be responsible for the perfor-mance of all inspection and tests required by this specification,prior to shipment of the material.6.Chemical Composition6.1 LimitsThe material shall co