1、Designation:B61798(Reapproved 2016)Standard Specification forCoin Silver Electrical Contact Alloy1This standard is issued under the fixed designation B617;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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 90%silver-10%copper alloytubin
3、g,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 standard.1.3 This standard does not
4、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 as providedby the manufacturer,to establish
5、 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 Requirements for WroughtPrecious Metal Electrical Con
6、tact Materials3.Manufacture3.1 Raw materials shall be of such quality and purity thatthe finished product will have the properties and characteristicsprescribed in this specification.3.2 The material shall be finished by such operations(coldworking,heat treating,annealing,turning,grinding,or pick-li
7、ng)as are required to produce the prescribed properties.4.Chemical Composition4.1 Material produced under this specification shall meet therequirements for chemical composition prescribed in Table 1.5.Mechanical Requirements5.1 Mechanical properties shall conform to the listings ofTable 2 or Table 3
8、.5.2 All test specimens shall be full thickness or diameterwhen practical.5.3 All tests are to be conducted at room temperature,about68F(20C).6.General Requirements6.1 The provisions of Specification B476 shall apply to allmaterials produced to this specification.7.Inspection and Testing7.1 Material
9、 furnished under this specification shall beinspected by the manufacturer as detailed in the applicableprovisions of Specification B476 and as listed as follows:7.1.1 Visual inspection at 10.7.1.2 Temper test(hardness or tension,but not both).Atension test is recommended for strip below 0.030-in.(0.
10、8-mm)thickness and for wire of any diameter.7.1.3 Dimensional tests.7.1.4 Spectrographic or chemical analysis when indicatedby the purchaser order.8.Keywords8.1 arcing contacts;coin silver alloy;compositions;electri-cal contacts;impurities;precious metals;silver alloy;silvercopper alloy1This specifi
11、cation 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 May 1,2016.Published May 2016.Originallyapproved in 1977.Last previous edition app
12、roved in 2010 as B617 98(2010).DOI:10.1520/B0617-98R16.2For 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 the standards Document Summary page onthe ASTM website.Copyright A
13、STM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 TABLE 2 Mechanical Properties of Sheet and StripTemperReduction in B&SNumbers(Reference)Percent Reduction(Reference)Ultimate Tensile Strength,psi(MPa)MinimumElongation in2 in.,%Hardness,Rockwell 30Tmin
14、maxA0036 00047 0002042 to 50(250)(320)12H22147 00057 000456 to 64(320)(390)34H32953 00063 000258 to 67(370)(430)Hard43758 00068 000161 to 69(400)(470)Spring86067 00075 000164 to 72(460)(520)TABLE 3 Mechanical Properties of Wire,Rod,and TubingTemperReduction in B&SNumbers(Reference)Percent Reduction(
15、Reference)Ultimate Tensile Strength,psi(MPa)MinimumElongation in2 in.,%Hardness,Rockwell 30TminmaxA0036 00047 0002042 to 50(250)(320)18H121142 00052 000849 to 57(290)(360)14H12147 00057 000456 to 64(320)(390)12H23756 00066 000458 to 66(390)(460)34H35061 00071 000361 to 72(420)(490)Hard46065 00074 00
16、0264 to 72(450)(510)Spring88474 00082 000168 to 76(510)(570)TABLE 1 Chemical CompositionAElementWeight%Silver89.6 to 91.0Copper9.0 to 10.4Zinc0.06 maxIron0.05 maxCadmium0.05 maxLead0.03 maxNickel0.01 maxAluminum0.005 maxPhosphorus0.02 maxTotal others0.06 maxAAnalysis is regularly made for the elements for which specific limits are listed.If,however,the presence of“other”elements is suspected or indicated in the courseof routine analysis,further analysis shall be made to determine that the total
