If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    ASTM B956 - 19e1

    Standard Specification for Welded Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins

    Active Standard ASTM B956 | Developed by Subcommittee: B05.04

    Book of Standards Volume: 02.01

      Format Pages Price  
    PDF 10 $52.00   ADD TO CART
    Hardcopy (shipping and handling) 10 $52.00   ADD TO CART


    This specification establishes the requirements for forge-welded copper and copper alloy with integral fins for use in surface condenser, evaporator, and heat exchanger. The product shall be welded tube of one of the following Copper or Copper Alloy UNS Nos.: C12000, C12200, C19200, C23000, C44300, C44400, C44500, C68700, C70400, C70600, C70620, C71000, C71500, C71520, and C72200. The material heat identification or traceability shall be specified if required. The product shall be manufactured by cold forming to produce an integral enhanced surface for improved heat transfer and shall typically be furnished with unenhanced ends, but may be furnished with enhanced ends or stripped ends. Temper conditions (annealed, WO61 or light cold-worked, WC55) for the tubes and the enhanced and unenhanced sections of the tubes are given. The material shall conform to the chemical composition requirements prescribed for copper, tin, aluminum, nickel, cobalt, lead, iron, zinc, manganese, arsenic, antimony, phosphorus, chromium, and other elements such as carbon, sulfur, silicon, and titanium as determined by chemical analysis. Requirements for grain size, dimensions, mass, and mechanical properties including tensile strength and yield strength as determined by tension test are detailed. The performance requirements including expansion, flattening, and reverse bend tests; mercurous nitrate test or ammonia vapor test; and nondestructive tests such as eddy-current, hydrostatic, and pneumatic tests are detailed as well.

    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 establishes the requirements for heat exchanger tubes manufactured from forge-welded copper and copper alloy tubing in straight lengths on which the external or internal surface, or both, has been modified by cold forming process to produce an integral enhanced surface for improved heat transfer.

    1.2 The tubes are typically used in surface condensers, evaporators, and heat exchangers.

    1.3 The product shall be produced of the following coppers or copper alloys, as specified in the ordering information.

    Copper or Copper Alloy
    UNS No.

    Type of Metal




    DLP Phosphorized, low residual phosphorus


    DHP Phosphorized, high residual phosphorus


    Phosphorized, 1 % iron


    Copper-Iron Alloy


    Red Brass


    Admiralty, arsenical


    Admiralty, antimonial


    Admiralty, phosphorized


    Aluminum Brass


    95-5 Copper-Nickel


    90-10 Copper-Nickel


    90-10 Copper-Nickel (Modified for Welding)


    80-20 Copper-Nickel


    70-30 Copper-Nickel


    70-30 Copper-Nickel (Modified for Welding)



    Note 1: Designations listed in Classification B224.

    1.4 Units—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.

    1.5 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 determine the applicability of regulatory limitations prior to use.

    1.6 Warning—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.

    1.7 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

    B154 Test Method for Mercurous Nitrate Test for Copper Alloys

    B224 Classification of Coppers

    B359/B359M Specification for Copper and Copper-Alloy Seamless Condenser and Heat Exchanger Tubes With Integral Fins

    B543/B543M Specification for Welded Copper and Copper-Alloy Heat Exchanger Tube

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

    B846 Terminology for Copper and Copper Alloys

    B858 Test Method for Ammonia Vapor Test for Determining Susceptibility to Stress Corrosion Cracking in Copper Alloys

    B968/B968M Test Method for Flattening of Copper and Copper-Alloy Pipe and Tube

    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

    E54 Test Methods for Chemical Analysis of Special Brasses and Bronzes

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

    E112 Test Methods for Determining Average Grain Size

    E118 Test Methods for Chemical Analysis of Copper-Chromium Alloys

    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

    E478 Test Methods for Chemical Analysis of Copper Alloys

    UNSPSC Code

    UNSPSC Code 40101802(Heat exchangers); 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/B0956-19E01

    Citation Format

    ASTM B956-19e1, Standard Specification for Welded Copper and Copper-Alloy Condenser and Heat Exchanger Tubes with Integral Fins, ASTM International, West Conshohocken, PA, 2019, www.astm.org

    Back to Top