ASTM B860-18(2022)

ABSTRACT This specification covers electrical contact components made from copper tungsten by powder metallurgical procedures. The material shall conform to the chemical composition limits as agreed upon between the manufacturer and the user. Qualification tests for determination of physical properties shall be performed on production parts, wherever practical or applicable. The tests shall be determined after consideration of the function of the part.This specification covers zinc master alloys which are used in hot dip galvanizing for the purpose of adjusting the concentration of certain alloying elements in the molten zinc bath. The paper presented the chemical composition of these materials which include six master alloys of zinc aluminium; Type A-1, Type A-2, Type A-3, Type A-4, Type A-5, Type A-6, and one master alloy of zinc-antimony, Type S-1. The material covered by this specification shall be made of uniform quality and shall be free from harmful contamination. The alloys shall be tested and conform to the required chemical composition requirements. SCOPE 1.1 This specification covers zinc master alloys which are used in hot dip galvanizing for the purpose of adjusting the concentration of certain alloying elements in the molten zinc bath. Table 1 covers the chemical composition of these materials which include six master alloys of zinc-aluminum (brightener) and one master alloy of zinc-antimony. ASTM Common UNS Type A-1 90/10 Zn/Al High Purity Z30750 Type A-2 90/10 Zn/Al Low Purity Z31710 Type A-3 95/5 Zn/Al High Purity Z30503 Type A-4 95/5 Zn/Al Low Purity Z31510 Type A-5 96/4 Zn/Al High Purity Z31520 Type A-6 96/4 Zn/Al Low Purity Z30504 Type S-1 90/10 Zn/Sb Z55710 Note 1: The master alloys in Specification B860 are intended to be used primarily in hot-dip galvanizing to adjust the concentration of certain elements in a molten zinc bath, and differ from the zinc-aluminum alloys in Specification B997 which are intended to be used primarily in molten zinc-aluminum. 1.2 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. 1.3 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 of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.