ASTM_B_793_-_16.pdf

Designation:B79316Standard Specification forZinc Casting Alloy Ingot for Sheet Metal Forming Dies andPlastic Injection Molds1This standard is issued under the fixed designation B793;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 specification covers commercial zinc alloys iningot form for remelting for the manufacture of dies and moldsfrom the alloys as shown in Table 1.1.2 This specification presents requirements for zinc alloyssuitable for the production of sand cast or plaster cast formingdies for sheet metal stamping operations and plastic injectionmolding.Alloy A is intended for use in the fabrication of diesfor sheet metal stamping under drop hammer and hydraulicpressure.Alloy B is a special purpose alloy of closely con-trolled composition and is primarily used in the manufacture ofplastic injection molds.1.3 This specification covers two zinc alloys which arespecified and designated as follows:UNSASTMTraditionalZ35543Alloy AKirksite AZ35542Alloy BKirksite B1.4 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 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 become familiarwith all hazards including those identified in the appropriateSafety Data Sheet(SDS)for this product/material as providedby the manufacturer,to establish appropriate safety and healthpractices,and determine the applicability of regulatory limi-tations prior to use.2.Referenced Documents2.1 The following documents of the issue in effect on dateof order acceptance form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B897 Specification for Configuration of Zinc and ZincAlloyJumbo,Block,Half Block,and Slab IngotB899 Terminology Relating to Non-ferrous Metals and Al-loysB908 Practice for the Use of Color Codes for Zinc CastingAlloy IngotB949 Specification for General Requirements for Zinc andZinc Alloy ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE88 Practice for Sampling Nonferrous Metals and Alloys inCast Form for Determination of Chemical CompositionE527 Practice for Numbering Metals and Alloys in theUnified Numbering System(UNS)E536 Test Methods for Chemical Analysis of Zinc and ZincAlloys2.3 ISO Standards:3ISO 3815-1 Zinc and zinc alloysPart 1:Analysis of solidsamples by optical emission spectrometryISO 3815-2 Zinc and zinc alloysPart 2:Analysis by in-ductively coupled plasma optical emission spectrometry3.Terminology3.1 Terms shall be defined in accordance with TerminologyB899.3.2 Definitions of Terms Specific to This Standard:3.2.1 Kirksite,na common trade name for aluminum-copper-magnesium alloys,Kirksite A and Kirksite B,used toproduce,among other things,sheet metal forming dies.3.2.2 plastic injection molds,nmolds used for the produc-tion of plastic parts by pressure injection of molten orsemi-molten plastic.3.2.3 sheet metal forming die,na die or pattern used toform sheet metal into a finished or semi-finished shape using1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.04 on Zinc and Cadmium.Current edition approved May 1,2016.Published May 1,2016.Originallyapproved in 1988.Last previous edition approved in 2015 as B793 15.DOI:10.1520/B0793-16.2For 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 American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.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 States1 mechanical force to make the sheet metal conform to the shapeof the die,often a pair of dies with a positive and negative facebetween which sheet metal is shaped under high pressure.4.Ordering Information4.1 Orders for zinc alloy ingot under this specification shallinclude information as specified in Specification B949.5.Chemical Requirements5.1 LimitsThe alloy shall conform to the requirements asto chemical composition prescribed in Table 1.5.2 Chemical requirement procedures shall be in compli-ance with the provisions of Specification B949.6.Sampling for Chemical Analysis6.1 Sampling procedures shall be in compliance with theprovisions of Specification