Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1992-06-29
1994-07-19
Sheehan, John P.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 104
Patent
active
053305868
ABSTRACT:
A method of producing a grain oriented silicon steel thin sheet having excellent magnetic properties. A silicon steel slab containing Cu, Se and Sb as inhibitor-forming elements is hot rolled to form a hot-rolled sheet, followed by cold rolling at least twice including intermediate annealing to form a cold-rolled sheet having a final thickness of about 0.10 to 0.25 mm, decarburization and primary recrystallization annealing, and then final finish annealing. The temperature of the material to be rolled on the inlet side of the hot finish rolling mill is about 1000.degree. to 1150.degree. C. the surface temperature of the work rolls of the first stand of the hot finish rolling mill immediately before contact with the material to be rolled is about 100.degree. C. or less the total rolling reduction of the hot finish rolling is about 93 to 97%, the intermediate annealing is effected at a temperature of about 900.degree. to 1050.degree. C. within a time of about 50 seconds, and the rolling reduction of the final cold rolling is about 50 to 80%.
REFERENCES:
patent: 4202711 (1980-05-01), Littmann et al.
patent: 4251296 (1981-02-01), Thornburg et al.
patent: 5039359 (1991-08-01), Yoshitomi et al.
Hayakawa Yasuyuki
Iwamoto Katsuo
Komatsubara Michiro
Takamiya Toshito
Watanabe Makoto
Kawasaki Steel Corporation
Miller Austin R.
Sheehan John P.
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