Method of producing grain-oriented silicon steel sheets having s

Details Method of producing grain-oriented silicon steel sheets having s Method of producing grain-oriented silicon steel sheets having s

1979-12-12

1981-03-10

Kendall, Ralph S.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148 62, 148 616, 427104, C23F 710, H01F 104

Patent

active

042552052

ABSTRACT:
A grain-oriented silicon steel sheet having substantially no glass film can be obtained by subjecting a cold rolled silicon steel sheet having a final gauge to a decarburization annealing to form subscale on the steel sheet surface, applying an annealing separator consisting of hydrated silicate mineral fine powder, a strontium- or barium-containing compound, calcium oxide or calcium hydroxide and the remainder being Al.sub.2 O.sub.3, and finally annealing the above treated steel sheet. The steel sheet has excellent punchability when the steel sheet is coated with a phosphate system or chromate-organic resin mixture system insulating coating.

REFERENCES:
patent: 3582407 (1971-06-01), Steger et al.
patent: 4120702 (1978-10-01), Akerblom

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