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ASTM

ASTM B631-93(2004)

(Specification)

Standard Specification for Silver-Tungsten Electrical Contact Materials

Standard Specification for Silver-Tungsten Electrical Contact Materials

ABSTRACT
This specification covers electrical contact components made from silver-tungsten by powder-metallurgical procedures. The material shall conform to composition limits specified. The material shall be finished by braze alloy backing, tumbling to polish surfaces, special surface finish, silver-rich surface layer, cleaning, etc. Chemical analysis and physical test shall be made to conform to the specified requirements.
SCOPE
1.1 This specification covers electrical contact components made from silver-tungsten by powder-metallurgical procedures.
1.2 This specification covers compositions within the silver-tungsten system normally specified by users of contacts.
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 Data Safety Sheet 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.

General Information

Status
Historical
Publication Date
30-Apr-2004
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

Replaces
ASTM B631-93(1998) - Standard Specification for Silver-Tungsten Electrical Contact Materials
Effective Date
01-May-2004
Replaced By
ASTM B631-93(2010) - Standard Specification for Silver-Tungsten Electrical Contact Materials
Effective Date
01-Oct-2010

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ASTM B631-93(2004) - Standard Specification for Silver-Tungsten Electrical Contact MaterialsASTM B631-93(2004) - Standard Specification for Silver-Tungsten Electrical Contact Materials
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ASTM B631-93(2004) - Standard Specification for Silver-Tungsten Electrical Contact Materials
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: B631 – 93 (Reapproved 2004)
Standard Specification for
1
Silver-Tungsten Electrical Contact Materials
This standard is issued under the fixed designation B631; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Chemical Composition
1.1 This specification covers electrical contact components 4.1 The material shall conform to composition limits as
made from silver-tungsten by powder-metallurgical proce- agreed upon between the manufacturer and purchaser.
dures. 4.2 The chemical analysis shall be made in accordance with
1.2 This specification covers compositions within the silver- the methods prescribed in the newest edition of the Annual
tungsten system normally specified by users of contacts. Book of ASTM Standards, or by any other approved method
1.3 This standard does not purport to address all of the agreed upon between the manufacturer and purchaser.
safety concerns, if any, associated with its use. It is the
5. Other Requirements
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate 5.1 The manufacturer and purchaser shall agree on qualifi-
cation tests for determination of physical properties.
Material Data Safety Sheet for this product/material as pro-
vided by the manufacturer, to establish appropriate safety and 5.2 The tests shall be performed on production parts,
wherever practical or applicable (small size contacts do not
health practices, and determine the applicability of regulatory
limitations prior to use. lend themselves to accurate conductivity measurement).
5.3 The tests shall be determined after consideration of the
2. Referenced Documents
function of the part.
2
2.1 ASTM Standards: 5.4 The typical properties of the four most common types of
B328 Test Method for Density, Oil Content, and Intercon- silver-tungsten contacts are given in the appendix.
nected Porosity of Sintered Metal Structural Parts and
3 6. Finishing of Contacts
Oil-Impregnated Bearings
6.1 The material shall be finished by such operations as
3. Ordering Information
necessary to meet requirements agreed upon by the maker and
3.1 Orders for this material under this specification shall user of the contacts (braze alloy backing, tumbling to polish
include the following information: surfaces, special surface finish, silver-rich surface layer, clean-
3.1.1 Dimensions (see Section 7). ing, etc.).
3.1.2 Chemical composition (see reference tables in the
7. Permissible Variations in Dimensions
Appendix X1 as a possible guide).
7.1 Permissible variations in dimensions shall be within the
3.1.3 Physicalproperties(seeSection6andAppendixX1as
guideline). limits specified on drawings describing the contacts and
accompanying the order, or shall be within the limits specified
3.1.4 Certification (see Section 13).
3.1.5 Other features as agreed upon between the purchaser in the purchase order.
8. Workmanship
and manufacturer.
8.1 The parts shall be free of defects in material or process-
ing that would seriously affect their performance.
1
This specification is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
9. Significance and Use
B02.05 on Precious Metals and Electrical Contact Materials.
Current edition approved May 1, 2004. Published May 2004. Originally
9.1 Proprietary methods for manufacture of these materials
approved in 1977. Last previous edition approved in 1993 as B631 – 93 (1998).
vary significantly among suppliers, and these methods influ-
DOI: 10.1520/B0631-93R04.
2 ence such properties as arc erosion, contact resistance, and
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM tendency to weld in service. Since the performance of contacts
Standards volume information, refer to the standard’s Document Summary page on
in a device depends on numerous factors outside the contact
the ASTM website.
itself (opening speed, closing speed, contact pressure, contact
3
Withdrawn. The last approved version of this historical standard is referenced
bounce, environmental variations, assembly technique and
on www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
B631 – 93 (2004)
variations, etc.) this specification cannot ensure performance other reasons for requiring analysis for specific elements, then
control in the application.As part of the qualifica
...

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