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Copyright 2008 ASTM International. All rights reserved.

WK14 Guide for Measuring Power Frequency Magnetic Properties of Flat-Rolled Electrical Steels Using Small Single Sheet Testers

Date Initiated: 02-07-2003
Date Deletion Requested: 03-21-2006

1. Scope

1.1 This guide covers test methods to determine the specific core loss and peak permeability of single-layer sheet-type specimens of flat-rolled electrical steels with sinusoidal excitation at a frequency of 50 Hz or 60 Hz.
1.2 This guide includes calibration procedures to provide correlation with the 25-cm Epstein frame.
1.3 The range of flux densities is governed by the properties of the test specimens and the instruments and test power source. Normally nonoriented electrical and magnetic lamination steels may be tested at flux densities up to about 16 kG [1.6T] for core loss. The maximum flux density for peak permeability testing is limited by the current carrying capacity of the magnetizing winding and the test power source. Most testers are capable of 50 Oe or more.
1.4 Within this guide, a small single sheet tester (small SST) is defined as a magnetic tester designed to test flat, sheared laminations. The width of a normal test specimen for the small SST shall not exceed 36 cm. The length of the active portion of a normal test specimen for the small SST shall not exceed 30 cm. The minimum specimen length shall be 5 cm. However, the specimen length shall not be less than the outside dimension of the distance between the yoke faces of the test fixture.
1.5 This guide covers two alternative test methods: Method 1 (sections 5-10) and Method 2 (Sections 11-18).
1.5.1 Test Method 1 covers the use of a Soken DAC-BHW-n Electrical Steel Sheet Tester.
1.5.2 Test Method 2 describes a test fixture having two windings that encircle the test specimen and two lowreluctance, low-core loss ferromagnetic yokes that serve as flux return paths.
1.5.3 The calibration method described in the Annex applies to both test methods.
1.6 The values and equations stated in customary (cgs-emu and inch-pound) or SI units are to be regarded separately as standard. Within this guide SI units are shown in brackets. 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.
1.7 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.