Standard Active Last Updated: Nov 07, 2019 Track Document
ASTM B250/B250M-19

Standard Specification for General Requirements for Wrought Copper Alloy Wire

Standard Specification for General Requirements for Wrought Copper Alloy Wire B0250_B0250M-19 ASTM|B0250_B0250M-19|en-US Standard Specification for General Requirements for Wrought Copper Alloy Wire Standard new BOS Vol. 02.01 Committee B05
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Significance and Use

12.1 For the purpose of determining compliance with the specified limits for requirements of the properties listed in the following table, an observed value or calculated value shall be rounded as indicated in accordance with the rounding method of Practice E29.


Rounded Unit for Observed
or Calculated Value



  Chemical composition
  Electrical resistivity/conductivity

  nearest unit in the last
   right-hand significant
   digit used in expressing
   the limiting value


  Tensile strength
  Yield strength

  nearest ksi [5 MPa]




   Below 5 %

  nearest multiple of 0.5 %

   5 % and over

  nearest 1 %


  Grain size


   Under 0.060 mm

  nearest multiple of 0.005 mm

   0.060 mm and over

  nearest 0.01 mm


This specification establishes the general requirements common to wrought copper and copper alloy wires. The materials for manufacture shall be a cast bar, billet, rod, or other form of such purity and soundness as to be suitable for processing by hot working, cold working, and subsequent annealing to produce finished products that meet the specified temper properties and have a uniform wrought structure. Products shall be sampled and prepared, then tested accordingly to examine their conformance to dimensional (diameter, thickness, specific and stock lengths, width, straightness, and edge contour), mechanical (tensile, yield and bend strengths, elongation, and Rockwell hardness), electrical (resistivity and conductivity), chemical composition, and grain size requirements. In the event of conflict between this specification and the individual casting product specifications, the requirements of the casting specification shall take precedence.


1.1 This specification establishes requirements common to wrought copper and copper alloy wire and shall apply to Specifications B16/B16M, B99/B99M, B134/B134M, B159/B159M, B197/B197M, B206/B206M, B272, B301/B301M, B453/B453M, B967/B967M, B974/B974M, and B981/B981M to the extent referenced therein.

1.2 The chemical composition, physical and mechanical properties, and all other requirements not included in this specification shall be prescribed in the product specification.

1.3 Units—Values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, SI units are shown in brackets. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other and values from the two systems shall not be combined.

1.4 The following safety hazard caveat pertains only to the test methods described in this specification. 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 establish appropriate safety, health, and environmental practices and to determine the applicability of regulatory limitations prior to use.

1.5 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.

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Book of Standards Volume: 02.01
Developed by Subcommittee: B05.02
Pages: 10
DOI: 10.1520/B0250_B0250M-19
ICS Code: 77.150.30