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ASTM B780-16(R2021) pdf download

ASTM B780-16(R2021) pdf download.Standard Specification for 75 % Silver, 24.5 % Copper, 0.5 % Nickel Electrical Contact Alloy
1.1 This specification covers an electrical contact material with the nominal composition of 75 % silver, 24.5 % copper, and 0.5 % nickel in the form of rod, wire, strip, and sheet.
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 ofregulatory limitations prior to use.
1.4 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.
4.1 Raw materials shall be of such quality and purity that the finished product will have the properties and characteristics prescribed in this specification.
4.2 The material shall be finished by such operations (cold working, heat-treating, annealing, turning, grinding, or pick- ling) as are required to produce the prescribed properties.
5. Chemical Composition
5.1 Material produced under this specification shall conform to the chemical composition limits prescribed in Table 1.
5.2 These specification limits do not preclude the possible presence of other unnamed elements, impurities, or additives. Analysis shall be regularly made only for the minor elements listed in the table. However, if a user knows of elements that might be detrimental to their application or has other reasons for requiring analysis for specific elements, then agreement between manufacturer and purchaser for both limits and methods of analysis should be required for elements not specified.
6. Mechanical Properties
6.1 The material shall conform to the applicable mechanical properties prescribed in Table 2 or Table 3.
6.2 All test specimens shall be the full thickness or diameter as the size supplied when practical. The test procedures shall follow the ASTM specifications referred to in Specification B476.

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