ASTM B477-97 pdf free.Standard Specification for Gold-Silver-Nickel Electrical Contact Alloy.
This specification covers 75 % gold 22 %silver 3 %nickel alloy tubing，rod,wire,strip，and sheet material forsliding electrical contacts.The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are forinformation only.This standard does not purport to address all of thesafety concerns，if any, associated with its use. It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateMaterial Safety Data Sheet for this product/material as pro-vided by the manufacturer;to establish appropriate safety andhealth practices, and determine the applicability of regulatorylimitations prior to use.Referenced Documents2.1 ASTM Standards:B476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact Materials 2.E 384 Test Method for Microindentation Hardness of Ma-terials 3
Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification. The material shall be finished by such operations (coldworking, heat treating， annealing,turning，grinding, or pick-ling) as are required to produce the prescribed properties.4.Chemical Composition: Material produced under the specification shall meet therequirements of chemical composition prescribed in Table 1. The contract or order may specify ultimate tensilestrength and elongation, microhardness (Knoop or Vickers), ora combination of these mechanical properties as temper crite-rion.If the contract or order does not specify a temper criterion,then the criterion for temper designation will be ultimatetensile strength and elongation.Mechanical properties shall conform to the listings ofTable 2.All test specimens shall be full size when practical.5.4 All tests are to be conducted at room temperature, about68F (20°C).
General Requirements:Specification B 476 shall apply to all materials producedto this specification. Microhardness, when performed, shall be in accordancewith Test Method E 384.Inspection and Testing:Material furnished under this specification shall beinspected by the manufacturer as listed below:Visual inspection at 10，Temper test (hardness or tensile),7.1.3 Dimensional tests, and Spectrographic or chemical analysis when indicatedby the purchase order.The purchaser shall perform such tests as are required toverify the quality of material procured under this specification.ASTM B477 pdf download.