1、Designation: B628 98 (Reapproved 2016)Standard Specification forSilver-Copper Eutectic Electrical Contact Alloy1This standard is issued under the fixed designation B628; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of l
2、ast revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This specification covers 72 % si
3、lver-28 % copper (eu-tectic) alloy rod, wire, strip, and sheet material for electricalcontacts.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered
4、 standard.1.3 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 appropriateSafety Data Sheet (SDS) for this product/material a
5、s providedby the manufacturer, to establish appropriate safety and healthpractices, and determine the applicability of regulatory limi-tations prior to use.2. Referenced Documents2.1 ASTM Standards:2B277 Test Method for Hardness of Electrical Contact Mate-rialsB476 Specification for General Requirem
6、ents for WroughtPrecious Metal Electrical Contact Materials3. General Requirements3.1 Specification B476 and Test Method B277 shall apply toall materials produced to this specification.4. Manufacture4.1 Raw materials shall be of such quality and purity thatthe finished product will have the properti
7、es and characteristicsprescribed in this specification.4.2 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.5. Chemical Composition5.1 Material produced under the specificat
8、ion shall conformto the requirements as to chemical composition prescribed inTable 1.6. Mechanical Requirements6.1 The material shall conform to the mechanical propertiesprescribed in Table 2 or Table 3.6.2 All test specimens shall be full thickness or diameterwhen practical.6.3 All tests are to be
9、conducted at room temperature, about68F (20C).7. Inspection and Testing7.1 Material furnished under this specification shall beinspected by the manufacturer as detailed in the applicableprovisions of Specification B476 and as listed below.7.1.1 Visual inspection at 10 .7.1.2 Temper test (hardness or
10、 tension, but not both). Atension test is recommended for strip below 0.030-in. (0.8-mm)thickness and for wire of any diameter. A tension test ispreferred when permitted by part size and quantity.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the purchase order.8.
11、 Keywords8.1 composition; electrical contacts; impurities; preciousmetals; silver copper alloy1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.
12、Current edition approved May 1, 2016. Published May 2016. Originallyapproved in 1977. Last previous edition approved in 2010 as B628 98 (2010).DOI: 10.1520/B0628-98R16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual
13、 Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1TABLE 2 Mechanical Properties of Sheet and StripTemperReduction inB or through
14、the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ from DLA Document Services, Building 4/D, 700 Robbins Ave.,Philadelphia, PA 19111-5094, http:/quicksearch.dla.mil.B628 98 (2016)3
