ASTM B780-1998(2010) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75% 铜24 5%及镍0 5%的电触点合金的标准规格》.pdf
《ASTM B780-1998(2010) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75% 铜24 5%及镍0 5%的电触点合金的标准规格》.pdf》由会员分享,可在线阅读,更多相关《ASTM B780-1998(2010) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75% 铜24 5%及镍0 5%的电触点合金的标准规格》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B780 98 (Reapproved 2010)Standard Specification for75 % Silver, 24.5 % Copper, 0.5 % Nickel Electrical ContactAlloy1This standard is issued under the fixed designation B780; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisi
2、on, the year of last 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 Department of Defense.1. Scope1.1 This specification co
3、vers an electrical contact materialwith 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 regardedas standard. The values given in parentheses are mathematicalconversions to SI units t
4、hat are provided for information onlyand are not considered 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 app
5、ropriateMaterial Safety Data Sheet (MSDS) for this product/materialas provided by the manufacturer, to establish appropriatesafety and health practices, and determine the applicability ofregulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2B476 Specification for General Req
6、uirements for WroughtPrecious Metal Electrical Contact Materials3. Ordering Information3.1 Refer to Specification B476.4. Materials and Manufacture4.1 Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specificati
7、on.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 this specification shall conformto the chemical composition limits
8、 prescribed in Table 1.5.2 These specification limits do not preclude the possiblepresence of other unnamed elements, impurities, or additives.Analysis shall be regularly made only for the minor elementslisted in the table. However, if a user knows of elements thatmight be detrimental to their appli
9、cation or has other reasonsfor requiring analysis for specific elements, then agreementbetween manufacturer and purchaser for both limits andmethods of analysis should be required for elements notspecified.6. Mechanical Properties6.1 The material shall conform to the applicable mechanicalproperties
10、prescribed in Table 2 or Table 3.6.2 All test specimens shall be the full thickness or diameteras the size supplied when practical. The test procedures shallfollow the ASTM specifications referred to in SpecificationB476.6.3 All tests are to be conducted at room temperature, about68F (20C).7. Inspec
11、tion, Rejection and Rehearing, Certification,Product Marking, and Supplementary Requirements7.1 Material furnished to this specification shall meet therequirements listed in Specification B476.8. Keywords8.1 arcing contacts; contacts; conductivity; electrical con-tacts; precious metals; silver alloy
12、; silver-copper alloy; wire1This 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.Current edition approved Oct. 1, 2010. Published October 2010. Orig
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