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ASTM B989-2019 pdf free download

ASTM B989-2019 pdf free download.Standard Specification for High Fluidity (HF) Zinc-Aluminum Alloy in Ingot Form for Thin Wall Die Castings
1. Scope
1.1 This specification covers a commercial zinc-aluminum alloy in ingot form for remelting for the manufacture of thin wall pressure die castings as designated and specified in Table 1. 1.2 Systems of nomenclature used to designate zinc and zinc-aluminum (ZA) alloys used for casting are described in Appendix X1. 1.3 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. 1.4 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. 1.5 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. Terminology
3.1 Terms shall be defined in accordance with Terminology B899. 3.2 Definitions ofTerms Specific to This Standard: 3.2.1 die casting, n—a casting process in which molten metal is injected under high velocity and pressure into a metal die and solidified, also a product produced by such a process; alternately known as pressure die casting. 3.2.2 high fluidity alloy, n—a zinc alloy by nature of its composition is capable of producing die castings with thinner wall sections compared to typical die cast alloys; often less than 0.012 in. (0.30 mm) in thickness. 3.2.3 thin wall die casting, n—a die casting with wall sections that can be less than 0.012 in. (0.30 mm) in thickness.
7. Methods for Chemical Analysis
7.1 The determination of chemical composition shall be made in accordance with Specification B949. 7.2 In case of dispute, the results secured by an approved method (or combination ofapproved methods), or by a method agreed upon by both parties, shall be the basis of acceptance. 7.2.1 Approved methods include: Test Methods E536, ISO 3815–1, or ISO 3815–2. Test Methods E536 is generally applicable, but must be slightly modified to cover the higher Al range. ISO 3815–1 and ISO 3815–2 are generic methods applied to zinc and zinc alloys. Each ofthe 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. 7.3 For purposes of determining compliance with specified composition limits as given in Table 1, an observed or calculated value shall be rounded to the nearest unit in the last right-hand place of figures shown in Table 1, in accordance with the rounding method of Practice E29.
11. Dimensions, Mass, and Permissible Variation, and Shapes and Sizes
11.1 Zinc casting alloy ingots are typically supplied in ingot bundles weighing 1700 to 2400 lb (770 to 1090 kg). 11.2 Ingots and bundles vary in size and weight depending on the alloy and supplier. 11.2.1 Standard ingots have a nominal weight in the range of 17 to 24 lb (8 to 11 kg) and are generally 24 to 26 in. (61 to 66 mm) long. 11.3 Margash bars or ingots come in two sizes with a nominal weight in the range of either 12 to 14 lb (5 to 6 kg) or 20 to 24 lb (9 to 11 kg). 11.4 Zinc casting alloy ingot may be ordered in jumbos or blocks, as specified in Specification B897. 11.5 Zinc casting alloy ingot may also be ordered in other shapes.

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