Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1989-01-25
1990-07-03
Andrews, Melvin J.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148113, H01F 1047
Patent
active
049388070
ABSTRACT:
Disclosed is a process for the preparation of a grain oriented silicon steel about sheet having a high flux density, which comprises hot-rolling a slab comprising 1.5 to 4.8% by weight of Si, 0.012 to 0.050% by weight of Al, 0.0010 to 0.0120% by weight of N, 0.0020 to 0.0150% by weight of Ti, up to 0.45% by weight of Mn and up to 0.012% by weight of at least one member selected S and Se, which satisfies the requirement 0.06 to 0.6 of Ti/N (at % ratio) and Mn/(S+Se).gtoreq.4.0 (weight ratio) with the balance comprising Fe and unavoidable impurities, to cold-rolling, performing decarburization annealing, coating an annealing separator on the steel sheet surface, then performing finish annealing, and performing a nitriding treatment of the steel sheet during the period of from the point of termination of final cold rolling to the point of initiation of secondary recrystallization at the finish annealing step.
REFERENCES:
patent: 3159511 (1964-12-01), Taguchi et al.
patent: 4171994 (1979-10-01), Miller Jr.
Transactions of the Metallurgical Society of Aime 212 (1958) pp. 769-781, by J. E. May and D. Turnbull.
Transactions of the Metallurgical Society of Aime 212 (1961) pp. 1201-1205, by H. C. Fiedler.
Iron and Steel, 53 (1967) pp. 1007-1023, by T. Matsuoka.
Japan Institute of Metals, 27 (1963) pp. 186-191, by T. Saito.
Kuroki Katsuro
Suga Yozo
Takahashi Nobuyuki
Andrews Melvin J.
Nippon Steel Corporation
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