ASTM B520 - 12

    Standard Specification for Tin-Coated, Copper-Clad Steel Wire for Electronic Application

    Active Standard ASTM B520 | Developed by Subcommittee: B01.06

    Book of Standards Volume: 02.03

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    This specification covers tin-coated, copper-clad steel wires for electronic applications. The four classes of steel wires considered here are: hard-drawn wires with 30% nominal conductivity (Class T30HS); annealed wires with 30% nominal conductivity (Class T30A); hard-drawn wires with 40% nominal conductivity (Class T40HS); and annealed wires with 40% nominal conductivity (Class T40A). Specimens shall go through tests and shall adhere to specified requirements for dimensions, electrical resistivity, tensile strength, and coating continuity and adherence.

    This abstract is a brief summary of the referenced standard. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.

    1. Scope

    1.1 This specification covers tin-coated copper-clad steel wire for electronic application.

    1.2 Four classes of tin-coated copper-clad steel wire are covered as follows:

    1.2.1 Class T30HS—Nominal 30 % conductivity, hard-drawn,

    1.2.2 Class T30A—Nominal 30 % conductivity, annealed,

    1.2.3 Class T40HS—Nominal 40 % conductivity, hard-drawn, and

    1.2.4 Class T40A—Nominal 40 % conductivity, annealed.

    1.3 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.

    1.3.1 Exception—The SI values for resistivity and volume are to be regarded as standard.

    1.4 The following safety hazards caveat pertains only to the test method portion, Section 6, of 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 and health practices and determine the applicability of regulatory limitations prior to use. (Warning—Consideration should be given to toxicity and flammability when selecting solvent cleaners.)

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B258 Specification for Nominal Diameters and Cross-Sectional Areas of AWG Sizes of Solid Round Wires Used as Electrical Conductors

    B452 Specification for Copper-Clad Steel Wire for Electronic Application

    National Institute of Standards and Technology

    NBS Handbook 100 Copper Wire Tables

    ICS Code

    ICS Number Code 29.060.10 (Wires)

    UNSPSC Code

    UNSPSC Code 26121520(Copper steel wire)

    Referencing This Standard

    DOI: 10.1520/B0520-12

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM B520-12, Standard Specification for Tin-Coated, Copper-Clad Steel Wire for Electronic Application, ASTM International, West Conshohocken, PA, 2012,

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