ASTM_B_275_-_14.pdf

Designation:B27514Standard Practice forCodification of Certain Zinc,Tin and Lead Die Castings1This standard is issued under the fixed designation B275;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This practice covers a system for designating die castingalloys of zinc,tin and lead.Those designations currently beingused in specifications under the jurisdiction of Committees B02on Nonferrous Metals are listed in Table X2.1 in AppendixX2.NOTE1The alloy designations now being used in Committee B07specifications for aluminum and aluminum-alloy wrought and cast prod-ucts conform toANSI H35.1.Alloys formerly codified by this practice andthe corresponding ANSI designations are shown in Tables X3.1 and X3.2of Appendix X3 for legacy purposes.NOTE2The alloy designations now being used in Committee B07specifications for magnesium and magnesium-alloy wrought and castproducts conform to Practice B951,as indicated in Appendix X4.Alloydesignations formerly codified by this practice are no longer relevant.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:2B86 Specification for Zinc and Zinc-Aluminum(ZA)AlloyFoundry and Die CastingsB102 Specification for Lead-and Tin-Alloy Die Castings(Withdrawn 2011)3B240 Specification for Zinc and Zinc-Aluminum(ZA)Al-loys in Ingot Form for Foundry and Die CastingsB327 Specification for Master Alloys Used in Making ZincDie Casting AlloysB951 Practice for Codification of Unalloyed Magnesium andMagnesium-Alloys,Cast and WroughtE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)2.3 ANSI Standard:4H35.1 Alloy and Temper Designation Systems for Alumi-num3.Basis of Codification3.1 The designations for alloys and unalloyed metals arebased on their chemical composition limits.3.2 Designations shall be assigned,revised,and cancelledby Subcommittee B02.04 of ASTM Committee B02 on Non-ferrous Metals and Alloys on written requests to its chairman.Complete 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 3)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(Notes 4 and 5).The full name ofthe base metal precedes the designation,but it is omitted forbrevity when the base metal being referred to is obvious.NOTE3For 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.NOTE4The 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.NOTE5The designation of a casting alloy in ingot form is derivedfrom the composition specified for the corresponding alloy in the form ofcastings.Thus,a casting ingot designation may consist of an alloydesignation having one or more serial letters,one for each productcomposition,or it may consist of one or more alloy designations.1This practice is under the jurisdiction of ASTM Committee B02 on NonferrousMetals and Alloys and is the direct responsibility of Subcommittee B02.04 on Zincand Cadmium.Current edition approved Oct.1,2014.Published October 2014.Originallyapproved in 1962.Last previous edition approved in 2013 as B275 131.DOI:10.1520/B0275-14.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available in the Related Materials section(gray pages)of the Annual Book ofASTM Standards,Vol 02.02.*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 4.2 The letters used to represent alloying elements shall bethose in Table 1.4.3 In rounding percentages,the nearest whole number shallbe used.If two choices are possible a