1、Designation:B40312Standard Specification forMagnesium-Alloy Investment Castings1This standard is issued under the fixed designation B403;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 parenthese
2、s indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope*1.1 This specification covers magnesium-alloy investmentcastings designated as sh
3、own in Table 1.1.2 Alloy designations are in accordance with PracticeE527;temper designations are in accordance with PracticeB296.1.3 The values stated in inch-pound units are to be regardedas the standard.The SI values in parentheses are for informa-tion only.2.Referenced Documents2.1 The following
4、 documents of the issue in effect on thedate of order acceptance 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-
5、Alloy ProductsB660 Practices for Packaging/Packing of Aluminum andMagnesium ProductsB661 Practice for Heat Treatment of Magnesium AlloysB666/B666M Practice for Identification Marking of Alumi-num and Magnesium ProductsB951 Practice for Codification of Unalloyed Magnesium andMagnesium-Alloys,Cast and
6、 WroughtB953 Practice for Sampling Magnesium and MagnesiumAlloys for Spectrochemical AnalysisB954 Test Method for Analysis of Magnesium and Magne-sium Alloys by Atomic Emission SpectrometryD3951 Practice for Commercial PackagingE29 Practice for Using Significant Digits in Test Data toDetermine Confo
7、rmance with SpecificationsE88 Practice for Sampling Nonferrous Metals and Alloys inCast Form for Determination of Chemical CompositionE94 Guide for Radiographic ExaminationE155 Reference Radiographs for Inspection of Aluminumand Magnesium CastingsE165 Practice for Liquid Penetrant Examination for Ge
8、neralIndustryE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.3 Federal Standards:Fed.Std.No.123 Marking for Shipping(Civil Agencies)32.4 Military Standards:MIL-STD-129 Marking for Shipment and Storage(MilitaryAgencies)33.Ordering Information3.1 Orders for castings
9、under this specification shall includethe following information:3.1.1 Quantity of each casting,3.1.2 Alloy(Section 6 and Table 1),3.1.3 Temper(see 5.1 and Table 2),3.1.4 Casting drawing giving all necessary dimensions andshowing amount of finish left for machining,3.1.5 Surface treatment(see 10.1),3
10、.1.6 Whether certification is required(see 11.1),3.1.7 Whether inspection is required at the manufacturersworks(see 12.1),and3.1.8 Special inspection requirements(see 12.3).4.Materials and Manufacture4.1 The responsibility for furnishing castings that can belaid out and machined to the finished dime
11、nsions within thepermissible variations specified,as shown on the drawings,shall rest with the manufacturer,except where mold equipmentis furnished by the purchaser.Sufficient stock shall be allowedfor shrinkage and,where required,for finishing;but castings ofexcessive weight shall not be furnished.
12、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 Nov.1,2012.Published November 2012.Originallyapproved in 1963.Last previous editi
13、on approved in 2007 as B403 07.DOI:10.1520/B0403-12.2For 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 fro
14、m Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.*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 Stat
15、es1 5.Treatment5.1 The castings may be subjected to such heat treatment asthe manufacturer desires to produce material that will conformto the requirements specified.Heat treatment shall be per-formed on the whole of the casting,never on a part only,andshall be applied in a manner that will produce
16、uniformity.Unless otherwise specified,treatment shall be in accordancewith Practice B661.6.Chemical Composition6.1 The castings shall conform to the chemical compositionlimits in Table 1.6.2 The chemical analysis shall be made in accordance withTest Method B954,or by any other approved methods agreedupon by the manufacturer and the purchaser.The analysis maybe made spectrochemically provided that,in case ofdisagreement,the results secured by Test Method B954 shall bethe basis for acceptance.6.3
