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ASTM B522-01(2021)

(Specification)

Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy

Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy

ABSTRACT
This specification covers 69% gold, 25% silver, 6% platinum alloy tubing, rod, wire, and sheet material for sliding electrical contacts. The material shall be finished by such operations (cold working, annealing, turning, grinding, pickling) as are required to produce the prescribed properties. The material shall be tested and conform to chemical composition, and mechanical and electrical property requirements. The mechanical requirements of the material are ultimate tensile strength, elongation, microhardness, hardness, or a combination of these mechanical properties as temper criterion. All tests shall be conducted at room temperature.
SCOPE
1.1 This specification covers 69 % gold, 25 % silver, 6 % platinum alloy tubing, rod, wire, and sheet material for sliding electrical contacts.  
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 Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Oct-2021
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

Refers
ASTM B476-01(2012) - Standard Specification for General Requirements for Wrought Precious Metal Electrical Contact Materials
Effective Date
01-May-2012
Refers
ASTM B476-01(2006) - Standard Specification for General Requirements for Wrought Precious Metal Electrical Contact Materials
Effective Date
01-Jun-2006
Refers
ASTM B476-01 - Standard Specification for General Requirements for Wrought Precious Metal Electrical Contact Materials
Effective Date
10-May-2001

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ASTM B522-01(2021) - Standard Specification for Gold-Silver-Platinum Electrical Contact AlloyASTM B522-01(2021) - Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy
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ASTM B522-01(2021) - Standard Specification for Gold-Silver-Platinum Electrical Contact Alloy
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation:B522 −01 (Reapproved 2021)
Standard Specification for
Gold-Silver-Platinum Electrical Contact Alloy
This standard is issued under the fixed designation B522; 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 3.2 The material shall be finished by such operations (cold
working,annealing,turning,grinding,pickling)asarerequired
1.1 This specification covers 69% gold, 25% silver, 6%
to produce the prescribed properties.
platinum alloy tubing, rod, wire, and sheet material for sliding
electrical contacts.
4. Chemical Composition
1.2 The values stated in inch-pound units are to be regarded
4.1 Materialproducedunderthespecificationshallmeetthe
as standard. The values given in parentheses are mathematical
requirements for chemical composition prescribed in Table 1.
conversions to SI units that are provided for information only
and are not considered standard.
5. Mechanical and Electrical Requirements
1.3 This standard does not purport to address all of the
5.1 The contract or order may specify ultimate tensile
safety concerns, if any, associated with its use. It is the
strength, elongation, microhardness (Knoop or Vickers), hard-
responsibility of the user of this standard to become familiar
ness (Rockwell or Rockwell Superficial), or a combination of
with all hazards including those identified in the appropriate
these mechanical properties as temper criterion. If the contract
Safety Data Sheet (SDS) for this product/material as provided
or order does not specify a temper criterion, then the criterion
by the manufacturer, to establish appropriate safety, health,
for temper designation will be ultimate tensile strength and
and environmental practices, and determine the applicability
elongation.
of regulatory limitations prior to use.
5.1.1 Knoophardnessindentationsshallbemadesothatthe
1.4 This international standard was developed in accor-
long axis of the indenter is parallel to the rolling or drawing
dance with internationally recognized principles on standard-
direction of the material.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
5.2 Mechanical and electrical properties shall conform to
mendations issued by the World Trade Organization Technical
the requirements of Table 2 and Table 3.
Barriers to Trade (TBT) Committee.
5.3 All test specimens shall be the supplied size when
practical.
2. Referenced Documents
5.4 All tests are to be conducted at room temperature (65 to
2.1 ASTM Standards:
80°F) (18 to 27°C).
B476Specification for General Requirements for Wrought
Precious Metal Electrical Contact Materials
6. General Requirements
3. Manufacture
6.1 Specification B476 shall apply to all materials produced
3.1 Raw materials shall be of such quality and purity that to this specification.
thefinishedproductwillhavethepropertiesandcharacteristics
prescribed in this specification. 7. Inspection and Testing
7.1 Material furnished under this specification shall be
inspected by the manufacturer as follows:
This specification is under the jurisdiction of ASTM Committee B02 on
7.1.1 Visual inspection of 10×,
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.05 on Precious Metals and Electrical Contact Materials.
7.1.2 Temper test (hardness or tensile),
Current edition approved Nov. 1, 2021. Published December 2021. Originally
7.1.3 Dimensional tests, and
approved in 1970. Last previous edition approved in 2017 as B
...

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SCOPE
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1.1 This specification covers an 80 % platinum—20 % iridium alloy, an 85 % platinum—15 % iridium alloy, and a 90 % platinum—10 % iridium alloy, in the form of rod, wire, strip, and sheet material for electrical contacts.  
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9.1 Proprietary methods for manufacture of these materials vary significantly among suppliers and these methods influence such properties as arc erosion, contact resistance, and the tendency to weld in service. Since the performance of contacts in a device depends on numerous factors outside the contact itself (opening speed, closing speed, contact pressure, contact bounce, environmental variations, assembly technique and variations, etc.), this specification cannot ensure performance control in the application. As part of the qualification on initial samples, it is recommended that the user functionally test the materials electrically for all devices applicable to the material's use. This specification provides a means for the contact manufacturer and contact user to reach agreement on the details of material to be supplied for a specific use and reasonable assurance that future lots will be similar in properties and microstructure to the initial test or sample contact supplied.
SCOPE
1.1 This specification covers electrical contact components made from silver nickel by powder metallurgical procedures.  
1.2 This specification covers compositions within the silver-nickel system normally specified by users of electrical contacts.  
1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.4 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 Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.  
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