ASTM B946 - 11

    Standard Test Method for Surface Finish of Powder Metallurgy (P/M) Products

    Active Standard ASTM B946 | Developed by Subcommittee: B09.05

    Book of Standards Volume: 02.05


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    Significance and Use

    The surface finish of a component may be critical for certain applications, affecting properties such as wear resistance, fatigue strength, and coefficient of friction.

    Surface finish may also be critical for component assembly or system performance. Dimensional fit and mating surface interaction may require certain surface finish requirements to meet performance specifications.

    1. Scope

    1.1 This test method covers measuring the surface finish of powder metallurgy (PM) products at all stages of manufacturing from green compact to fully hardened finished component.

    1.2 This test method provides the definition and schematic of some common surface finish parameters (Ra, Rt, and Rz ISO)

    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.

    1.4 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 to determine the applicability of regulatory limitations prior to use.


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

    MPIF Standard

    MPIFStandard58 Method for Determination of Surface Finish of Powder Metallurgy Products

    ASTM Standards

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 25.220.40 (Metallic coatings); 77.160 (Powder metallurgy)

    UNSPSC Code

    UNSPSC Code


    DOI: 10.1520/B0946-11

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