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ASTM B793-16(R2021) pdf download

ASTM B793-16(R2021) pdf download.Standard Specification for Zinc Casting Alloy Ingot for Sheet Metal Forming Dies and Plastic Injection Molds
1.1 This specification covers commercial zinc alloys in ingot form for remelting for the manufacture of dies and molds from the 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 dies for sheet metal stamping operations and plastic injection molding. Alloy A is intended for use in the fabrication of dies for sheet metal stamping under drop hammer and hydraulic pressure. Alloy B is a special purpose alloy of closely con- trolled composition and is primarily used in the manufacture of plastic injection molds.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability ofregulatory limitations prior to use.
1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3.2.2 plastic injection molds, n—molds used for the produc- tion of plastic parts by pressure injection of molten or semi-molten plastic.
3.2.3 sheet metal forming die, n—a die or pattern used to form sheet metal into a finished or semi-finished shape using mechanical force to make the sheet metal conform to the shape ofthe die, often a pair of dies with a positive and negative face between which sheet metal is shaped under high pressure.
4. Ordering Information
4.1 Orders for zinc alloy ingot under this specification shall include information as specified in Specification B949. 5. Chemical Requirements
5.1 Limits—The alloy shall conform to the requirements as to 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 Analysis
6.1 Sampling procedures shall be in compliance with the provisions of Specification B949.
7. Method of Chemical Analysis
7.1 The determination of chemical composition shall be made in accordance with Test Methods E536, or ISO 3815-1,or ISO 3815-2 or other methods. In case of dispute, the results secured by Test Methods E536, or ISO 3815-1, or ISO 3815-2 shall be the basis of acceptance. N OTE 1—Test Methods E536 is not directly applicable to the alloys in Specification B793. ISO 3815-1 and ISO 3815-2 are generic methods applied to 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/or traceable standards along with valid quality assurance techniques, will be able to perform and validate the methods and demonstrate acceptable precision and accuracy. 8. Materials and Manufacture
8.1 The alloys may be made by any approved process.
8.2 The material covered by this specification shall be of uniform quality and shall be free from dross, slag, or other harmful contamination. 8.3 Jumbo or block ingots shall conform to configuration shown in Specification B897, or to a shape and size previously agreed upon.

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