1、Designation: B793 13B793 15Standard 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 r
2、evision, 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 in ingot form for remelting for the manufacture
3、 of dies and molds fromthe alloys as shown in Table 1.1.2 This specification presents requirements for zinc alloys suitable for the production of sand cast or plaster cast forming diesfor sheet metal stamping operations and plastic injection molding. Alloy A is intended for use in the fabrication of
4、 dies for sheetmetal stamping under drop hammer and hydraulic pressure. Alloy B is a special purpose alloy of closely controlled compositionand is primarily used in the manufacture of plastic injection molds.1.3 This specification covers two zinc alloys which are specified and designated as follows:
5、UNS ASTM TraditionalZ35543 Alloy A Kirksite AZ35542 Alloy B Kirksite B1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered standard.1.5 This stan
6、dard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety DataSheet (MSDS)(SDS) for this product/material as prov
7、ided by the manufacturer, to establish appropriate safety and health practices,and determine the applicability of regulatory limitations prior to use.2. Referenced Documents2.1 The following documents of the issue in effect on date of order acceptance form a part of this specification to the extentr
8、eferenced herein:2.2 ASTM Standards:2B897 Specification for Configuration of Zinc and Zinc Alloy Jumbo, Block, Half Block, and Slab IngotB899 Terminology Relating to Non-ferrous Metals and AlloysB908 Practice for the Use of Color Codes for Zinc Casting Alloy IngotB949 Specification for General Requi
9、rements for Zinc and Zinc Alloy ProductsE29 Practice for Using Significant Digits in Test Data to Determine Conformance with SpecificationsE88 Practice for Sampling Nonferrous Metals and Alloys in Cast Form for Determination of Chemical CompositionE527 Practice for Numbering Metals and Alloys in the
10、 Unified Numbering System (UNS)E536 Test Methods for Chemical Analysis of Zinc and Zinc Alloys2.3 ISO Standards:3ISO 3815-1 Zinc and zinc alloysPart 1: Analysis of solid samples by optical emission spectrometryISO 3815-2 Zinc and zinc alloysPart 2: Analysis by inductively coupled plasma optical emis
11、sion spectrometry1 This specification is under the jurisdiction of ASTM Committee B02 on Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee B02.04 on Zincand Cadmium.Current edition approved Feb. 1, 2013June 1, 2015. Published March 2013July 2015. Originally approved in 19
12、88. Last previous edition approved in 20122013 asB793 12.B793 13. DOI: 10.1520/B0793-13.10.1520/B0793-15.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standard
13、sstandards Document Summary page on the ASTM website.3 Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http:/www.ansi.org.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of wh
14、at changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered th
15、e official document.*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 States13. Terminology3.1 Terms shall be defined in accordance with Terminology B899.3.2 Definitions of Terms
16、 Specific to This Standard:3.2.1 Kirksite, na common trade name for aluminum-copper-magnesium alloys, Kirksite A and Kirksite B, used to produce,among other things, sheet metal forming dies.3.2.2 plastic injection molds, nmolds used for the production of plastic parts by pressure injection of molten
17、 or semi-moltenplastic.3.2.3 sheet metal forming die, na die or pattern used to form sheet metal into a finished or semi-finished shape usingmechanical force to make the sheet metal conform to the shape of the die, often a pair of dies with a positive and negative facebetween which sheet metal is sh
18、aped under high pressure.4. Ordering Information4.1 Orders for zinc alloy ingot under this specification shall include information as specified in Specification B949, Section 4.5. Materials and Manufacture5.1 The alloys may be made by any approved process.5.2 The material covered by this specificati
19、on shall be of uniform quality and shall be free from dross, slag, or other harmfulcontamination.5.3 Jumbo or block ingots shall conform to configuration shown in Specification B897, or to a shape and size previously agreedupon.6. Chemical Requirements6.1 LimitsThe alloy shall conform to the require
20、ments as to chemical composition prescribed in Table 1.6.2 Chemical requirement procedures shall be in compliance with the provisions of Specification B949, Section 5.2.7. Sampling for Chemical Analysis7.1 Sampling procedures shall be in compliance with the provisions of Specification B949, Section
21、6.8. Method of Chemical Analysis8.1 The determination of chemical composition shall be made in accordance with Test Methods E536, or ISO 3815-1, orISO 3815-2 or other methods. In case of dispute, the results secured by Test Methods E536, or ISO 3815-1, or ISO 3815-2 shallbe the basis of acceptance.N
22、OTE 1Test Methods E536 is not directly applicable to the alloys in Specification B793. ISO 3815-1 and ISO 3815-2 are generic methods appliedto zinc and zinc alloys. Each of the methods may be modified and formatted for the alloy to be assayed. An experienced chemist, using suitable and/orTABLE 1 Che
23、mical and North American Color CodeRequirementsA,BComposition, %UNS Z35543Alloy AKirksite AUNS Z35542Alloy BKirksite BColor CodeC Green/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.
24、05Tin 0.005 max 0.001 maxZinc Remainder RemainderA The 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 han
25、d place of figures used in expressing the specified limit, in accordancewith the rounding method of Practice E29.B UNS designations were established in accordance with Practice E527.C Refer to Practice B908. (Note: Colors indicated are for North Americanapplications.)B793 152traceable standards alon
26、g with valid quality assurance techniques, will be able to perform and validate the methods and demonstrate acceptable precisionand accuracy.9. Source Inspection9.1 Source inspection shall be in compliance with the provisions of Specification B949, Section 7.10. Rejection and Rehearing10.1 Claims to
27、 be considered in accordance with the provisions of Specification B949, Section 8.11. Investigation of Claims11.1 Claims shall be investigated in accordance with the provisions of Specification B949, Section 8.12. Settlement of Claims12.1 Claims shall be settled in accordance with the provisions of
28、Specification B949, Section 8.13. Product Identification Marking and Packaging13.1 Each slab, block, jumbo or ingot shall be marked for identification in accordance with the provisions of Specification B949,Section 10.14. Keywords14.1 blanking dies; casting; casting alloys; forming dies; gravity cas
29、ting; Kirksite; KirksiteA; Kirksite B; sheet metal dies; zincSUMMARY OF CHANGESCommittee B02 has identified the location of selected changes to this standard since the last issue (B793 12)13) that may impact the use of this standard. (Approved FebruaryJune 1, 2013.)2015.)(1) A section on Source Insp
30、ection was reinstated after it had been incorrectly removed.The definitions for Kirksite, plasticinjection molds, and sheet metal forming die were added to Terminology Section 3.Committee B02 has identified the location of selected changes to this standard since the last issue (B793 10)that may impa
31、ct the use of this standard. (Approved May 1, 2012.)(1) Revisions have been made to Sections 4, 6, 7, 8, 9, and 10 to reference Specification B949 and delete certain portions of thesesections formerly a part of this standard.(2) The titles of Sections 7, 9, and 10 have been revised to be in agreemen
32、t with a standard format for Subcommittee B02.04standards.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 pate
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