1、Designation: B793 16Standard 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
2、, 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
3、 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 s
4、heet 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:UNS ASTM Tr
5、aditionalZ35543 Alloy A Kirksite AZ35542 Alloy B Kirksite 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
6、 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 es
7、tablish 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 Stand
8、ards:2B897 Specification for Configuration of Zinc and Zinc AlloyJumbo, 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 P
9、roductsE29 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
10、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 Te
11、rms 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,
12、 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 onNonferrou
13、s 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 AS
14、TM 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 1003
15、6, 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 States1mechanical force to make the sheet metal conform to the shapeof the die, often a pair of dies with
16、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 requirement
17、s 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 B949.7. Method of Chemical Analy
18、sis7.1 The determination of chemical composition shall bemade in accordance with Test Methods E536, or ISO 3815-1,or ISO 3815-2 or other methods. In case of dispute, the resultssecured by Test Methods E536, or ISO 3815-1, or ISO 3815-2shall be the basis of acceptance.NOTE 1Test Methods E536 is not d
19、irectly applicable to the alloys inSpecification B793. ISO 3815-1 and ISO 3815-2 are generic methodsapplied to zinc and zinc alloys. Each of the methods may be modified andformatted for the alloy to be assayed. An experienced chemist, usingsuitable and/or traceable standards along with valid quality
20、 assurancetechniques, will be able to perform and validate the methods anddemonstrate acceptable precision and accuracy.8. Materials and Manufacture8.1 The alloys may be made by any approved process.8.2 The material covered by this specification shall be ofuniform quality and shall be free from dros
21、s, slag, or otherharmful contamination.8.3 Jumbo or block ingots shall conform to configurationshown in Specification B897, or to a shape and size previouslyagreed upon.9. Physical Properties NA10. Mechanical Properties NA11. Dimensions, Mass, and Permissible Variation, andShapes and Sizes NA12. Wor
22、kmanship, Finish, and Appearance NA13. Inspection13.1 Source inspection shall be in compliance with theprovisions of Specification B949.14. Rejection and Rehearing14.1 See appropriate requirements in Specification B949.15. Certification15.1 See appropriate requirements in Specification B949.16. Prod
23、uct Identification Marking and Packaging16.1 Each slab, block, jumbo or ingot shall be marked foridentification in accordance with the provisions of Specifica-tion B949.17. Keywords17.1 blanking dies; casting; casting alloys; forming dies;gravity casting; Kirksite; Kirksite A; Kirksite B; sheet meta
24、ldies; zincTABLE 1 Chemical and North American Color CodeRequirementsA,BComposition, %UNS Z35543Alloy AKirksite AUNS Z35542Alloy BKirksite BColor CodeCGreen/Red Green/BlackElementAluminum 3.54.5 3.94.3Cadmium 0.005 max 0.003 maxCopper 2.53.5 2.52.9Iron 0.100 max 0.075 maxLead 0.007 max 0.003 maxMagn
25、esium 0.020.10 0.020.05Tin 0.005 max 0.001 maxZinc Remainder RemainderAThe following applies to all specified limits in this table: For purposes ofdetermining conformance with this specification, the observed value or calculatedvalue obtained from analysis shall be rounded off “to the nearest unit”
26、in the lastright hand place of figures used in expressing the specified limit, in accordancewith the rounding method of Practice E29.BUNS designations were established in accordance with Practice E527.CRefer to Practice B908. (Note: Colors indicated are for North Americanapplications.)B793 162SUMMAR
27、Y OF CHANGESCommittee B02 has identified the location of selected changes to this standard since the last issue (B79315)that may impact the use of this standard. (Approved May 1, 2016.)(1) The references to specific sections in Specification B949were removed.(2) Several sections added to conform to
28、a standard templateand reference Specification B949.Committee B02 has identified the location of selected changes to this standard since the last issue (B79313)that may impact the use of this standard. (Approved June 1, 2015.)(1) The definitions for Kirksite, plastic injection molds, andsheet metal
29、forming die were added to Terminology Section 3.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights,
30、 and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for rev
31、ision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you
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