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    ASTM B447 - 12a(2021)

    Standard Specification for Welded Copper Tube

    Active Standard ASTM B447 | Developed by Subcommittee: B05.04

    Book of Standards Volume: 02.01

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    This specification establishes the requirements for welded copper tube with a longitudinal seam free of filler metal produced from sheet or strip of one of the Copper UNS Nos. C10100, C10200, C10300, C10800, C11000, C12000, C12200, and C14200. Copper C11000 welded tube shall not be used in applications where hydrogen embrittlement during heating is a concern. Tempers of the welded tube types are as follows: as-welded: WM50, WM02, or WM04, welded and annealed: W060 and W050, welded and cold drawn: WH00, WH02, and WH04, and fully finished: O60, O50, H55, H58, and H80. The product shall be manufactured by forming the material into a tubular shape on a suitable forming mill and welding shall be accomplished by any process that produces forge or fusion welds. The external flash of forge welded tube shall be removed by scarfing and the internal flash shall be treated by IFI (to remain in the as-welded condition), IFR (scarfing) or IFD (rolling or drawing) technique. The material shall conform to the chemical composition requirements prescribed for copper, phosphorus, and arsenic, as determined by chemical analysis. The welded tubes shall meet the requirements specified for grain size, electrical mass resistivity, mechanical properties such as tensile strength and Rockwell hardness, dimensions, and mass. Performance requirements includes microscopical examination, hydrogen embrittlement susceptibility test, and expansion test. Requirements for tensile, electromagnetic (eddy-current), hydrostatic, and pneumatic tests are detailed.

    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.

    Significance and Use

    20.1 For purposes of determining compliance with the specified limits for requirements of the properties listed in the following table and for dimensional tolerances, an observed value or a 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

    Nearest unit in the last right-hand  



    Electrical Resistivity

    Digit used in expression the limiting value

     Grain size up to 0.055 mm, incl

    nearest multiple of 0.005 mm

     Tensile strength

    nearest ksi (5 MPa)


    Nearest 1%

    1. Scope

    1.1 This specification establishes the requirements for welded copper tube with a longitudinal seam free of filler metal produced from sheet or strip of the following coppers:

    Copper UNS Nos.

    Type of Copper



    Oxygen-free electronic




    Oxygen-free, extra low phosphorus


    Oxygen-free, low phosphorus


    Electrolytic tough pitch


    Phosphorus deoxidized, low residual phosphorus


    Phosphorus deoxidized, high residual phosphorus


    Phosphorus deoxidized, arsenical

    1.2 Unless otherwise specified in the contract or purchase order, product furnished of any listed copper, with the exception of copper C11000, shall be considered acceptable.

    1.2.1 Copper C11000 welded tube shall not be used in applications where hydrogen embrittlement during heating is a concern.

    1.3 Units—The values stated in inch-pound units are to be regarded as standard except for grain size, which is given in SI units. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

    1.4 The following hazard caveat pertains only to Section 13 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, health, and environmental practices and 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.

    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

    B153 Test Method for Expansion (Pin Test) of Copper and Copper-Alloy Pipe and Tubing

    B170 Specification for Oxygen-Free Electrolytic CopperRefinery Shapes

    B193 Test Method for Resistivity of Electrical Conductor Materials

    B577 Test Methods for Detection of Cuprous Oxide (Hydrogen Embrittlement Susceptibility) in Copper

    B601 Classification for Temper Designations for Copper and Copper AlloysWrought and Cast

    B846 Terminology for Copper and Copper Alloys

    E3 Guide for Preparation of Metallographic Specimens

    E8/E8M Test Methods for Tension Testing of Metallic Materials

    E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications

    E53 Test Method for Determination of Copper in Unalloyed Copper by Gravimetry

    E62 Test Methods for Chemical Analysis of Copper and Copper Alloys (Photometric Methods)

    E112 Test Methods for Determining Average Grain Size

    E243 Practice for Electromagnetic (Eddy Current) Examination of Copper and Copper-Alloy Tubes

    E255 Practice for Sampling Copper and Copper Alloys for the Determination of Chemical Composition

    E527 Practice for Numbering Metals and Alloys in the Unified Numbering System (UNS)

    ICS Code

    ICS Number Code 23.040.15 (Non-ferrous metal pipes); 77.150.30 (Copper products)

    UNSPSC Code

    UNSPSC Code 40181500(Welded copper tubes)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/B0447-12AR21

    Citation Format

    ASTM B447-12a(2021), Standard Specification for Welded Copper Tube, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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