ASTM_B_951_-_11.pdf

Designation:B95111Standard Practice forCodification of Unalloyed Magnesium and Magnesium-Alloys,Cast and Wrought1This standard is issued under the fixed designation B951;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 provides a system for designating unal-loyed magnesium and magnesium-alloys that have been usedcommercially since 1952,and thus is intended to be theregistration source for unalloyed magnesium and magnesium-alloys.A record of designations along with the establishedcompositions is given in Table 2.1.2 The equivalent Unified Numbering System(UNS)alloydesignations shown in the appendixes are in accordance withPractice E527.2.Referenced Documents2.1 The following documents form a part of this practice tothe extent referenced herein:2.2 ASTM Standards:2B80 Specification for Magnesium-Alloy Sand CastingsB90/B90M Specification for Magnesium-Alloy Sheet andPlateB91 Specification for Magnesium-Alloy ForgingsB92/B92M Specification for Unalloyed Magnesium Ingotand Stick For RemeltingB93/B93M Specification for Magnesium Alloys in IngotForm for Sand Castings,Permanent Mold Castings,andDie CastingsB94 Specification for Magnesium-Alloy Die CastingsB107/B107M Specification for Magnesium-Alloy ExtrudedBars,Rods,Profiles,Tubes,and WireB199 Specification for Magnesium-Alloy Permanent MoldCastingsB403 Specification for Magnesium-Alloy Investment Cast-ingsB843 Specification for Magnesium Alloy Anodes for Ca-thodic ProtectionE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)3.Basis of Codification3.1 The designations for alloys and unalloyed metals arebased on their chemical composition limits.NOTE1For unalloyed magnesium,magnesium-alloys,cast andwrought,standard limits for alloying elements and impurities are ex-pressed to the following places:Less than 0.0001%(used only formagnesium alloys)0.0000X0.0001 to 0.001%0.000X0.001 to 0.01%0.00X0.01 to 0.10%Unalloyed aluminum made by a refiningprocess0.0XXAlloys and unalloyed aluminum ormagnesiumnot made by a refining process0.0X0.10 through 0.55%0.XXOver 0.55%0.X,X.X,XX.X3.2 Designations shall be assigned,revised,and cancelledby Subcommittee B07.04 of ASTM Committee B07 on LightMetals and Alloys on written requests to its chairman.Com-plete chemical composition limits shall be submitted withrequest for assignment or revision of designations.Arbitraryassignments by other subcommittees or committees will not berecognized.4.Alloys4.1 Designation for alloys shall consist of not more than twoletters representing the alloying elements(Note 2)specified inthe greatest amount,arranged in order of decreasingpercentages,or in alphabetical order if of equal percentages,followed by the respective percentages rounded off to wholenumbers and a serial letter(Note 3).The full name of the basemetal precedes the designation,but it is omitted for brevitywhen the base metal being referred to is obvious.NOTE2For codification,an alloying element is defined as an element(other than the base metal)having a minimum content greater than zeroeither directly specified or computed in accordance with the percentagesspecified.1This practice 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.1,2011.Published January 2011.Originallyapproved in 2007.Last previous edition approved in 2010 as B951 10.DOI:10.1520/B0951-11.2For 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.*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 NOTE3The serial letter is arbitrarily assigned in alphabetical se-quence starting with“A”(omitting“I”and“O”)and serves to differentiateotherwise identical designations.A serial letter is necessary to completeeach designation.4.2 The letters used to represent the two greatest amounts ofthe alloying elements shall be those in Table 1.4.3 In rounding percentages,the nearest whole number shallbe used.If two choices are possible as when the decimal isfollowed by a 5 only,or a 5 followed only by zeros,the nearesteven whole number shall be used.4.4 When a range is specified for the alloying element,therounded mean shall be used in the designation.4.5 When only a minimum percentage is specified for thealloying element,the rounded minimum percentage shall beused in the designation.5.Unalloyed Metals5.1 Designations for unalloyed metals consist of the s