ASTM A799/A799M-04(2009)

    Standard Practice for Steel Castings, Stainless, Instrument Calibration, for Estimating Ferrite Content

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    1. Scope

    1.1 This practice covers the procedure for calibration of instruments to be used for estimating the ferrite content of the microstructure of cast stainless steels by magnetic response or measurement of permeability. This procedure covers both primary and secondary instruments.

    1.1.1 A primary instrument is one that has been calibrated using National Institute of Standards and Technology-Standard Reference Material (NIST-SRM) thickness coating standards. It is a laboratory tool to be used with test specimens. Some primary instruments may be used to directly measure the ferrite content of castings.

    1.1.2 A secondary instrument is one that has been calibrated by the use of secondary standards that have been measured by a calibrated primary instrument. Secondary instruments are to be used to directly measure the ferrite content of castings.

    1.2 The values stated in either inch-pound units or SI units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.

    1.3 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.

    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

    A941 Terminology Relating to Steel, Stainless Steel, Related Alloys, and Ferroalloys

    B499 Test Method for Measurement of Coating Thicknesses by the Magnetic Method: Nonmagnetic Coatings on Magnetic Basis Metals

    E562 Test Method for Determining Volume Fraction by Systematic Manual Point Count

    NIST Standard


    ICS Code

    ICS Number Code 77.140.80 (Iron and steel castings)

    UNSPSC Code

    UNSPSC Code 31100000(Castings and casting assemblies)

    DOI: 10.1520/A0799_A0799M-04R09

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