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Last Updated: Jun 14, 2011
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ASTM A840/A840M-00(2006)
Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
A0840_A0840M-00R06
ASTM|A0840_A0840M-00R06|en-US
Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)
Standard
A840/A840M Standard Specification for Fully Processed Magnetic Lamination Steel (Withdrawn 2011)>
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BOS Vol. 03.07 Committee A06
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Abstract
This specification covers standard requirements for flat-rolled carbon steel used in the fully processed condition in magnetic lamination applications. Steels supplied to this specification normally do not require further heat treatment by the user. There are no chemical requirements for these lamination steels. Instead the steels shall be produced to specified maximum core-loss values. Steels produced to this specification are available in thicknesses of 0.0185 in. (0.47 mm) and 0.025 in. (0.64 mm). For each thickness there are two core-loss types. The core loss is determined using the Epstein test method at a frequency of 60 Hz and a maximum flux density of 15 kG. In addition to the magnetic property requirements, dimensional tolerances, lamination factors and mechanical hardnesses are specified.
Scope
1.1 This specification covers cold-rolled carbon steel coils or strip used in the fully processed condition in magnetic lamination applications.
1.2 This steel is produced to specified maximum core-loss values and is intended primarily for commercial power frequency (50- and 60-Hz) applications in magnetic devices. Desirable core-loss and permeability characteristics are developed during mill processing, so further heat treatment by the purchaser is not necessary for most uses.
1.3 Fully processed magnetic lamination steels are flat-rolled low carbon iron alloys having 1 % maximum silicon and 0.4 % maximum aluminum.
1.4 The values stated in customary (cgs-emu and inch-pound) units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units which are provided for information only and are not considered standard.