ASTM B780-1998(2004) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75%、铜24 5%及镍0 5%的电触点合金标准规范》.pdf
《ASTM B780-1998(2004) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75%、铜24 5%及镍0 5%的电触点合金标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM B780-1998(2004) Standard Specification for 75% Silver 24 5% Copper 0 5% Nickel Electrical Contact Alloy《含银75%、铜24 5%及镍0 5%的电触点合金标准规范》.pdf(2页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: B 780 98 (Reapproved 2004)Standard Specification for75 % Silver, 24.5 % Copper, 0.5 % Nickel Electrical ContactAlloy1This standard is issued under the fixed designation B 780; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revi
2、sion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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
3、 covers 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 This standard does not purport to address all the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of t
4、his standard to become familiar with all hazardsincluding those identified in the appropriate Material SafetyData Sheet for this product/material as provided by themanufacturer, to establish appropriate safety and health prac-tices, and determine the applicability of regulatory limitationsprior to u
5、se.2. Referenced Documents2.1 ASTM Standards:2B 476 Specification for General Requirements for WroughtPrecious Metal Electrical Contact Materials3. Ordering Information3.1 Refer to Specification B 476.4. Materials and Manufacture4.1 Raw materials shall be of such quality and purity thatthe finished
6、product will have the properties 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
7、 produced under this specification shall conformto the chemical composition limits 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 t
8、able. However, if a user knows of elements thatmight be detrimental to their application 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. Mechanica
9、l Properties6.1 The material shall conform to the applicable mechanicalproperties 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 SpecificationB
10、476.6.3 All tests are to be conducted at room temperature, about68F (20C).1This 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 appr
11、oved May 1, 2004. Published May 2004. Originallyapproved in 1987. Last previous edition approved in 1998 as B 780 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to
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