ASTM B780-98(2010)
(Specification)Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy
Standard Specification for 75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact Alloy
ABSTRACT
This specification covers electrical contact alloys with the nominal composition of 75% silver, 24.5% copper, and 0.5% nickel in the form of rods, wires, strips, and sheets. Raw materials shall be of such quality and purity that the products, which shall be finished by such operations as cold working, heat treatment, annealing, turning, grinding, or pickling, shall adhere to the chemical composition and mechanical property requirements prescribed here. Besides analysis for the elements silver, copper, and nickel, further analysis is to be made for suspected or indicated impurities, such as zinc, iron, cadmium, and lead, to make sure that their total does not exceed specified limits. Mechanical tests, which are to be conducted at room temperature, shall evaluate the materials' tensile strength, elongation, Rockwell hardness, and area and thickness reduction.
SCOPE
1.1 This specification covers an electrical contact material with 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 regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:B780 −98(Reapproved 2010)
Standard Specification for
75% Silver, 24.5% Copper, 0.5% Nickel Electrical Contact
Alloy
This standard is issued under the fixed designation B780; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript 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. Scope 4. Materials and Manufacture
4.1 Raw materials shall be of such quality and purity that
1.1 This specification covers an electrical contact material
thefinishedproductwillhavethepropertiesandcharacteristics
with the nominal composition of 75% silver, 24.5% copper,
prescribed in this specification.
and 0.5% nickel in the form of rod, wire, strip, and sheet.
4.2 The material shall be finished by such operations (cold
1.2 Thevaluesstatedininch-poundunitsaretoberegarded
working, heat-treating, annealing, turning, grinding, or pick-
as standard. The values given in parentheses are mathematical
ling) as are required to produce the prescribed properties.
conversions to SI units that are provided for information only
and are not considered standard.
5. Chemical Composition
1.3 This standard does not purport to address all of the
5.1 Materialproducedunderthisspecificationshallconform
safety concerns, if any, associated with its use. It is the
to the chemical composition limits prescribed in Table 1.
responsibility of the user of this standard to become familiar
5.2 These specification limits do not preclude the possible
with all hazards including those identified in the appropriate
presence of other unnamed elements, impurities, or additives.
Material Safety Data Sheet (MSDS) for this product/material
Analysis shall be regularly made only for the minor elements
as provided by the manufacturer, to establish appropriate
listed in the table. However, if a user knows of elements that
safety and health practices, and determine the applicability of
might be detrimental to their application or has other reasons
regulatory limitations prior to use.
for requiring analysis for specific elements, then agreement
between manufacturer and purchaser for both limits and
2. Referenced Documents
methods of analysis should be required for elements not
specified.
2.1 ASTM Standards:
B476Specification for General Requirements for Wrought
6. Mechanical Properties
Precious Metal Electrical Contact Materials
6.1 Thematerialshallconformtotheapplicablemechanical
properties prescribed in Table 2 or Table 3.
3. Ordering Information
6.2 Alltestspecimensshallbethefullthicknessordiameter
3.1 Refer to Specification B476.
as the size supplied when practical. The test procedures shall
follow the ASTM specifications referred to in Specification
B476.
This specification is under the jurisdiction of ASTM Committee B02 on
6.3 Alltestsaretobeconductedatroomtemperature,about
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.05 on Precious Metals and Electrical Contact Materials.
68°F (20°C).
Current edition approved Oct. 1, 2010. Published October 2010. Originally
approved in 1987. Last previous edition approved in 2004 as B780–98(2004).
7. Inspection, Rejection and Rehearing, Certification,
DOI: 10.1520/B0780-98R10.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Product Marking, and Supplementary Requirements
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 Material furnished to this specification shall meet the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. requirements listed in Specification B476.
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