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  • ASTM A 804/A804M : 2004 : R2015

    Superseded A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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    Standard Test Methods for Alternating-Current Magnetic Properties of Materials at Power Frequencies Using Sheet-Type Test Specimens

    Available format(s):  Hardcopy, PDF

    Superseded date:  22-02-2021

    Language(s):  English

    Published date:  26-10-2015

    Publisher:  American Society for Testing and Materials

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    Abstract - (Show below) - (Hide below)

    CONTAINED IN VOL. 03.07, 2017 Defines the determination of specific core loss and peak permeability of single layers of sheet-type specimens tested with normal excitation at a frequency of 50 or 60 Hz.

    Scope - (Show below) - (Hide below)

    1.1These test methods cover the determination of specific core loss and peak permeability of single layers of sheet-type specimens tested with normal excitation at a frequency of 50 or 60 Hz.

    Note 1:These test methods have been applied only at the commercial power frequencies, 50 and 60 Hz, but with proper instrumentation and application of the principles of testing and calibration embodied in the test methods, they are believed to be adaptable to testing at frequencies ranging from 25 to 400 Hz.

    1.2These test methods use calibration procedures that provide correlation with the 25-cm [250-mm] Epstein test.

    1.3The range of test magnetic flux densities is governed by the properties of the test specimen and by the available instruments and other equipment components. Normally, nonoriented electrical steels can be tested over a range from 8 to 16 kG [0.8 to 1.6 T] for core loss. For oriented electrical steels, the normal range extends to 18 kG [1.8 T]. Maximum magnetic flux densities in peak permeability testing are limited principally by heating of the magnetizing winding and tests are limited normally to a maximum ac magnetic field strength of about 150 Oe [12 000 A/m].

    1.4These test methods cover two alternative procedures as follows:
    Test Method 1—Sections 6 – 12
    Test Method 2—Sections 13 – 19

    1.4.1Test Method 1 uses a test fixture having (1) two windings that encircle the test specimen, and (2) a ferromagnetic yoke structure that serves as the flux return path and has low core loss and low magnetic reluctance.

    1.4.2Test Method 2 uses a test fixture having (1) two windings that encircle the test specimen, (2) a third winding located inside the other two windings and immediately adjacent to one surface of the test specimen, and (3) a ferromagnetic yoke structure which serves as the flux-return path and has low magnetic reluctance.

    1.5The values and equations stated in customary (cgs-emu and inch-pound) units or SI units are to be regarded separately as standard. Within this standard, SI units are shown in brackets except for the sections concerning calculations where there are separate sections for the respective unit systems. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in nonconformance with this standard.

    1.6This 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.

    General Product Information - (Show below) - (Hide below)

    Committee A 06
    Development Note Supersedes ASTM A 804. (02/2010)
    Document Type Test Method
    Product Note Reconfirmed 2015
    Publisher American Society for Testing and Materials
    Status Superseded
    Superseded By
    Supersedes

    Standards Referenced By This Book - (Show below) - (Hide below)

    ASTM A 876 : 2017 : EDT 1 Standard Specification for Flat-Rolled, Grain-Oriented, Silicon-Iron, Electrical Steel, Fully Processed Types
    ASTM A 345 : 2019 Standard Specification for Flat-Rolled Electrical Steels for Magnetic Applications

    Standards Referencing This Book - (Show below) - (Hide below)

    ASTM A 340 : 2021 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing
    ASTM A 683 : 2016 : REDLINE Standard Specification for Nonoriented Electrical Steel, Semiprocessed Types
    ASTM A 340 : 2020 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing
    ASTM A 677 : 2016 : REDLINE Standard Specification for Nonoriented Electrical Steel Fully Processed Types
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