1、Designation: B 541 01 (Reapproved 2006)Standard Specification forGold Electrical Contact Alloy1This standard is issued under the fixed designation B 541; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A
2、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 covers a gold-rich, age-hardenable
3、alloy in rod, wire, and strip form applicable to 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 The following
4、 precautionary statement pertains to thetest method portion only, Section 7, of this specification. Thisstandard does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to become familiar with all hazards includingt
5、hose identified in the appropriate Material Safety Data Sheet(MSDS) for this product/material as provided by the manufac-turer, to establish appropriate safety and health practices, anddetermine the applicability of regulatory limitations prior touse.2. Referenced Documents2.1 ASTM Standards:2B 476
6、Specification for General Requirements for WroughtPrecious Metal Electrical Contact MaterialsE8 Test Methods for Tension Testing of Metallic MaterialsE 384 Test Method for Microindentation Hardness of Ma-terials3. Materials and Manufacture3.1 Raw materials shall be of such quality and purity thatthe
7、 finished product will have the properties and characteristicsprescribed in this specification.3.2 The material shall be finished by such operations (coldworking, annealing, turning, grinding, age hardening, etc.) asare required to produce the prescribed properties.4. Chemical Composition4.1 Materia
8、l produced under this specification shall meet therequirements of Table 1 for chemical composition.5. Condition5.1 This specification covers the conditions and forms listedin Table 2.6. Mechanical Properties6.1 Mechanical properties shall conform to Table 3 andTable 4 as appropriate.6.2 The contract
9、 or order may specify ultimate tensilestrength, elongation, microhardness (Knoop or Vickers), hard-ness (Rockwell or Rockwell Superficial), or a combination ofthese mechanical properties as temper criterion. If the contractor order does not specify a temper criterion, then the criterionfor temper de
10、signation will be ultimate tensile strength andelongation.6.3 Mechanical properties of flattened wire, less than 0.012in. (0.30 mm) thick shall conform to 6.1 (Table 5).1This specification is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility
11、 of SubcommitteeB02.05 on Precious Metals and Electrical Contact Materials.Current edition approved June 1, 2006. Published June 2006. Originallyapproved in 1970. Last previous edition approved in 2001 as B 541 01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
12、ustomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.TABLE 1 Chemical RequirementsElement Composition, Weight %Nominal RangeGold 71.5 70.572.5Platinum 8.5 8.09.0Silver 4.5 4.05.0Copper 14.5 13.515.5Zi
13、nc 1.0 0.71.3Total base metal impurities . 0.2 maxTotal platinum group metal impurities . 0.2 maxTABLE 2 Conditions and FormsProcessSymbolFormWire Strip RodAnnealedStress relievedAS-RXXXXXAge hardened from solutionannealed conditionHT-A XXXAge hardened from solution annealedand cold-worked condition
14、HT-CWXXX1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Test Methods7.1 Test methods are in accordance with SpecificationB 476.7.2 All tension tests are in accordance with Test MethodsE8 and tensile specimens are full cross-sectio
15、n size whenpractical.7.3 Hardness is in accordance with Test Method E 384. Testmaterial 0.005 in. (0.13 mm) in thickness (diameter) and largerusing a 100-gf indenter load. Test material less than 0.005 in.in thickness (diameter) using a 50-gf indenter load. Make aminimum of five hardness indentions
16、on each specimen. Makeall indentions so that the long axis of the Knoop indenter isparallel to the rolling or drawing direction of the material.7.4 Perform chemical analysis by spectrochemical or wetanalysis methods.7.5 Conduct all tests at room temperature (65 to 85F) (18to 29C).8. General Requirem
17、ents8.1 Specification B 476 shall apply to all materials producedto this specification.9. Inspection and Testing9.1 Material furnished under this specification shall beinspected and tested by the manufacturer as follows:9.1.1 Visual inspection at 103 magnification,9.1.2 Tension or hardness tests, or
18、 both, temper verification,9.1.3 Dimensional inspection, and9.1.4 Chemical analysis when indicated by the purchaseorder.10. Keywords10.1 contacts; electrical contacts; gold alloy; gold-platinum-silver; low contact resistance; low energy contact; non arcingcontactTABLE 3 Mechanical Properties of Wire
19、 (0.004 to 0.020-in. (0.12 to 0.5-mm) diameter)AProperty ConditionA S-R HT-A HT-CWTensile strength, ksi 85110 130170 130165 150200Tensile strength, MPa 590760 9001170 9001140 10301380Elongation, % in 5 in. or 125 mm 20 min 515 714 210Hardness, Knoop, HK100B180240 270340 280350 310380Hardness, Vicker
20、s HV100B180250 270340 285360 290370ASee 6.2.BSee 7.3.TABLE 4 Mechanical Properties of Wire (0.021 to 0.080-in. (0.51 to 0.200-mm) diameter)AProperty ConditionA S-R HT-A HT-CWTensile strength, ksi 80110 130170 130160 145195Tensile strength, MPa 550760 9001170 9001100 10001340Elongation, % in 2 in. or
21、 50 mm 16 min 414 514 210Hardness, Knoop HK100B180240 270340 270340 290370Hardness, Vickers HV100B180250 270340 285360 290370ASee 6.2.BSee 7.3.TABLE 5 Mechanical Properties of Strip (0.003 to 0.020-in. (0.12 to 0.5-mm) thick)AProperty ConditionA S-R HT-A HT-CWTensile strength, ksi 85115 125165 12515
22、5 140180Tensile strength, MPa 590790 8601140 8601070 9701240Elongation, % in 2 in. or 50 mm 12 min 316 312 210Hardness, Knoop, HK100B200250 270340 270340 290370Hardness, Vickers HV100B180250 270340 275350 285365ASee 6.2.BSee 7.3.B 541 01 (2006)2APPENDIX(Nonmandatory Information)X1. REFERENCE PROPERT
23、IES OF GOLD ELECTRICAL CONTACT ALLOYX1.1 Table X1.1 lists typical property values that are usefulfor engineering calculations.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are e
24、xpressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not rev
25、ised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you m
26、ay attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United St
27、ates. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE X1.1 Typical Physical PropertiesProperty Units Co
28、nditionA S-R HT-A HT-CWResistivity Vcmil/ftVcm13522.412520.88714.58714.5Conductivity percent IACS 7.7 8.3 12.2 12.2Density g/cm3Troy oz/in.315.98.3715.98.3715.98.3715.98.37Thermal expansion,70212F (21100C)F13 106C13 106712.6712.6712.6712.6Youngs modulus million psiGPa16110161101611016110Shear modulu
29、sAmillion psiGPa.5.5385.538Proportional limit ksiMPa70480120830115790130900Fatigue strengthRotate/bend 108cyclesksiMPa35250.30210Solidus temperature C 925 925 925 925Softening voltage mV 230 . . 150Melting voltage mV 350 . . 360Thermal emf versus Pt mV/F + 1.7 + 2.2 + 2.2 + 2.2mV/C +3 +4 +4 +4AAlso known as modulus of rigidity or torsional modulus, G.B 541 01 (2006)3
