Grain oriented electromagnetic steel sheets having a very low ir

Details Grain oriented electromagnetic steel sheets having a very low ir Grain oriented electromagnetic steel sheets having a very low ir

1988-07-28

1990-03-06

McDowell, Robert

Stock material or miscellaneous articles

All metal or with adjacent metals

Laterally noncoextensive components

148307, 428687, B23P 900

Patent

active

049065300

ABSTRACT:
A grain oriented electromagnetic steel sheet having a very low iron loss is obtained by subjecting a surface of base metal in the sheet after finish annealing to a particular mechanical polishing and has a surface roughness having a center-line average roughness of not more than 0.3 .mu.m after the polishing and the number of abrasive grains embedded in a layer just beneath polished surface of not more than 20,000 grains/cm.sup.2.

REFERENCES:
patent: 3523881 (1970-08-01), Hirst et al.
patent: 3930905 (1976-01-01), Akerblom
patent: 3932236 (1976-01-01), Wada et al.
patent: 4698272 (1987-10-01), Inokuti et al.

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