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ASTM B628-98

(Specification)

Standard Specification for Silver-Copper Eutectic Electrical Contact Alloy

Standard Specification for Silver-Copper Eutectic Electrical Contact Alloy

SCOPE
1.1 This specification covers 72% silver-28% copper (eutectic) alloy rod, wire, strip, and sheet material for electrical contacts.

General Information

Status
Historical
Publication Date
22-Sep-1999
ICS
77.120.99 - Other non-ferrous metals and their alloys
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.05 - Precious Metals and Electrical Contact Materials and Test Methods
Current Stage
Ref Project

Relations

Replaced By
ASTM B628-98(2004) - Standard Specification for Silver-Copper Eutectic Electrical Contact Alloy
Effective Date
01-May-2004

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ASTM B628-98 - Standard Specification for Silver-Copper Eutectic Electrical Contact Alloy
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B 628 – 98
Standard Specification for
Silver-Copper Eutectic Electrical Contact Alloy
This standard is issued under the fixed designation B 628; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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.
A
TABLE 1 Chemical Composition
1. Scope
1.1 This specification covers 72 % silver-28 % copper (eu-
Element Weight %
tectic) alloy rod, wire, strip, and sheet material for electrical
Silver 71.0 to 73.0
contacts.
Copper balance
1.2 This standard does not purport to address all THE
Total of all impurities 0.15
Zinc 0.06 max
safety concerns, if any, associated with its use. It is the
Iron 0.05 max
responsibility of the user of this standard to establish appro-
Cadmium 0.05 max
priate safety and health practices and determine the applica-
Lead 0.03 max
Nickel 0.01 max
bility of regulatory limitations prior to use.
Aluminum 0.005 max
1.3 It is the responsibility of the user to become familiar
Phosphorus 0.03 max
with all hazards including those identified in the appropriate Total others 0.06 max
A
Material Safety Data Sheet for this product/material as pro-
Analysis 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
vided by the manufacturer.
course of routine analysis, further analysis shall be made to determine that the
total of these “other” elements and the listed impurities are not in excess of the total
2. Referenced Documents
impurities limit.
2.1 ASTM Standards:
B 277 Test Method for Hardness of Electrical Contact
Materials
6. Mechanical Requirements
B 476 Specification for General Requirements for Wrought
6.1 The material shall conform to the mechanical properties
Precious Metal Electrical Contact Materials
prescribed in Table 2 or Table 3.
6.2 All test specimens shall be full thickness or diameter
3. General Requirements
when practical.
3.1 Specification B 476 and Test Method B 277 shall apply
6.3 All tests are to be conducted at room temperature, about
to all materials produced to this specification.
68°F (20°C).
4. Manufacture
7. Inspection and Testing
4.1 Raw materials shall be of such quality and purity that
7.1 Material furnished under this specification shall be
the finished product will have the properties and characteristics
inspected by the manufacturer as detailed in the applicable
prescribed in this specification.
provisions of ASTM Specification B 476 and as listed below.
4.2 The material shall be finished by such operations (cold
7.1.1 Visual inspection at 10 3.
working, heat treating, annealing, turning, grinding, or pick-
7.1.2 Temper test (hardness or tension, but not both). A
ling) as are required to produce the prescribed properties.
tension test is recommended for strip below 0.030-in. (0.8-mm)
thickness and for wire of any diameter. A tension test is
5. Chemical Composition
preferred when permitted by part size and quantity.
5.1 Material produced under the specification shall con-
7.1.3 Dimensional tests.
form to the requirements as to chemical composition pre-
7.1.4 Spectrographic or chemical analysis when indicated
scribed in Table 1.
by the purchase order.
1 8. Keywords
This specification is under the jurisdiction of ASTM Committee B-2 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
8.1 composition; electrical contacts; impurities; precious
B2.05 on Precious Metals.
metals; silver copper alloy
Current edition approved May 10, 1998. Published October 1998. Originally
{1
published as B 628 – 77. Last previous edition B 628 – 83(1993) .
Annual Book of ASTM Standards, Vol 02.04.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
B 628
TABLE 2 Mechanical Properties of Sheet and Strip
Reduction inB&S Percent Ultimate Tensile Strength, psi (MPa) Minimum
Hardness,
Temper Numbers Reduction Elongation
Rockwell 30 T
Minimum Maximum
(Reference) (Reference) in 2 in., %
A 0 0 45 000 55 000 15 56–64
(310) (380)
1/4H 1 11 56 000 66 000 7 61–69
(390) (460)
1/2H 2 21 60 000 70 000 3
...

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1.1 This specification covers electrical contact components made from silver nickel by powder metallurgical procedures.  
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