Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1993-03-29
1993-12-14
Andrews, Melvyn J.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, C21D 812
Patent
active
052698530
ABSTRACT:
A decarburized steel sheet for a thin oriented silicon steel sheet having improved magnetic and coating characteristics and a method of producing the same. Silicon steel strip is hot-rolled, cold-rolled to a final thickness of about 0.28 mm or less, subjected to decarburization/primary-recrystallization annealing, coated with an annealing separator, and thereafter subjected to finishing annealing. In the decarburization/primary-recrystallization annealing step, a novel subscale is formed at the steel sheet surface having a fayalite-silica composition ratio in accordance with an infrared reflection absorbance ratio of about 0.5 to 5.5, and a marked oxygen amount of about 0.4 to 1.6 g/m.sup.2.
Hayakawa Yasuyuki
Iwamoto Katsuo
Komatsubara Michiro
Watanabe Makoto
Andrews Melvyn J.
Ip Sikyin
Kawasaki Steel Corporation
Miller Austin R.
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