1、Designation: B 793 08Standard Specification forZinc Casting Alloy Ingot for Sheet Metal Forming Dies andPlastic Injection Molds1This standard is issued under the fixed designation B 793; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 d
3、ies 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 diesfo
4、r 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:UNS ASTM
5、 TraditionalZ35543 Alloy A Kirksite AZ35542 Alloy B Kirksite B1.4 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 appropriat
6、eMaterial Safety Data Sheet (MSDS) for this product/materialas provided by the manufacturer, to establish appropriatesafety and health practices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on dateof
7、order acceptance form a part of this specification to theextent referenced herein:2.2 ASTM Standards:2B 897 Specification for the Configuration of Zinc and ZincAlloy Jumbo and Block IngotB 899 Terminology Relating to Non-ferrous Metals andAlloysB 908 Practice for the Use of Color Codes for Zinc Cast
8、ingAlloy IngotB 949 Specification for General Requirements for Zinc andZinc Alloy ProductsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE47 Test Methods for Chemical Analysis of Zinc Die-Casting Alloys3E88 Practice for Sampling Nonferrous Metals an
9、d Alloysin Cast Form for Determination of Chemical CompositionE 527 Practice for Numbering Metals and Alloys in theUnified Numbering System (UNS)E 536 Test Methods for ChemicalAnalysis of Zinc and ZincAlloys3. Terminology3.1 Terms shall be defined in accordance with TerminologyB 899.1This specificat
10、ion 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 March 1, 2008. Published April 2008. Originallyapproved in 1988. Last previous edition approved in 2003 as B 793 03.2
11、For 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.3Withdrawn.TABLE 1 Chemical and North American Color CodeRequi
12、rementsA,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 maxMagnesium 0.020.10 0.020.05Tin 0.005 max 0.001 maxZinc Remainder R
13、emainderAThe 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” in the lastright hand place of figures used in expressing the
14、specified limit, in accordancewith the rounding method of Practice E29.BUNS designations were established in accordance with Practice E 527.CRefer to Practice B 908. (Note: Colors indicated are for North Americanapplications.)1*A Summary of Changes section appears at the end of this standard.Copyrig
15、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Ordering Information4.1 Orders for ingots under this specification shall includethe following information:4.1.1 Quantity in pounds,4.1.2 Alloy (Table 1),4.1.3 Size, if not manufacturers stan
16、dard,4.1.4 Specification number and date,4.1.5 Source inspection (Section 7), and4.1.6 Marking (Section 9).5. Materials and Manufacture5.1 The alloys may be made by any approved process.5.2 The material covered by this specification shall be ofuniform quality and shall be free from dross, slag, or o
17、therharmful contamination.5.3 Jumbo or block ingots shall conform to configurationshown in Specification B 897, or to a shape and size previouslyagreed upon.5.4 Material produced under this specification shall conformwith the General Requirements of Specification B 949, unlessotherwise noted in this
18、 specification.6. Chemical Requirements6.1 LimitsThe alloy shall conform to the requirements asto chemical composition prescribed in Table 1. Conformanceshall be determined by the producer by analyzing samplestaken at the time the ingots are made. If the producer hasdetermined the chemical compositi
19、on of the metal during thecourse of manufacture, he shall not be required to sample andanalyze the finished product.6.2 In case of dispute, the following requirements shallapply:6.2.1 Number of SamplesSamples for verification ofchemical composition shall be taken as follows:6.2.2 If the ingots are s
20、hipped in carload lots of the samealloy, not less than five ingots shall be taken at random fromthe carload for sampling. If the shipment is less than a carloadlot, one sample ingot shall be taken for each 10 000 lb (4 500kg) or fraction thereof. When it is deemed necessary, a samplemay be taken fro
21、m each melt of 1 000 lb (450 kg) or more.6.3 Methods of SamplingSamples from ingots for deter-mination of chemical composition shall be taken in accordancewith one of the following methods:6.3.1 Samples for chemical analysis shall be taken from thematerial by drilling, sawing, milling, turning, or c
22、lipping arepresentative piece or pieces to obtain weight of preparedsample not less than 100 g. Sampling shall be in accordancewith Practice E88.6.3.2 By agreement, an optional method of sampling foranalysis may be by melting together representative portions ofeach ingot selected, and then sampling
23、the liquid composite bycasting suitable specimens for either spectrographic or chemi-cal analysis.6.4 Method of AnalysisThe determination of chemicalcomposition shall be made in accordance with suitable chemi-cal (Test Methods E 536 or E47for tin), or other methods. Incase of dispute, the results se
24、cured by Test Method E 536 andTest Method E47for tin only shall be the basis of acceptance.7. Source Inspection7.1 If the purchaser desires that his representative inspect orwitness the inspection and testing of the product prior toshipment, such agreement shall be made by the purchaser andproducer
25、or supplier as part of the contract or purchase order.7.2 When such inspection or witness of inspection andtesting is agreed upon, the producer or supplier shall afford thepurchasers representative all reasonable facilities to satisfyhim that the product meets the requirements of this specifica-tion
26、. Inspection and tests shall be conducted so there is nounnecessary interference with the producers operations.8. Rejection and Rehearing8.1 Material that fails to conform to the requirements of thisspecification may be rejected. Rejection should be reported tothe producer or supplier promptly and i
27、n writing. In case ofdissatisfaction with the results of the test, the producer orsupplier may make claim for a rehearing. If the rehearingestablishes that the material does not conform to the require-ments of this specification, as much of the rejected originalmaterial as possible shall be returned
28、 to the producer orsupplier.9. Identification Marking9.1 All ingots shall be properly marked for identificationwith the producers name or brand.9.2 Each bundle or skid shall be identified with the produc-ers heat, lot, or other identification mark.9.3 Each ingot, bundle or skid shall be marked with
29、theappropriate Color Code for the alloy as per North Americanrequirements in Practice B 908.10. Preparation for Delivery10.1 PackagingUnless otherwise specified, the ingot shallbe packaged to provide adequate protection during normalhandling and transportation. Each package shall contain onlyone all
30、oy unless otherwise agreed upon.11. Keywords11.1 blanking dies; casting; casting alloys; forming dies;gravity casting; Kirksite; Kirksite A; Kirksite B; sheet metaldies; zincB793082SUMMARY OF CHANGESCommittee B02 has identified the location of selected changes to this standard since the last issue (
31、B 793 - 03)that may impact the use of this standard. (Approved March 1, 2008.)(1) Specification B 897 was added to Reference Documentsand 5.3.(2) Specification B 949 was added to Reference Documentsand 5.4.ASTM International takes no position respecting the validity of any patent rights asserted in
32、connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the res
33、ponsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive caref
34、ul 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 shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International
35、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).B793083
