Metal treatment – Stock – Ferrous
Patent
1995-02-23
1996-09-24
Yee, Deborah
Metal treatment
Stock
Ferrous
148603, 148651, C21D 802, C22C 3818
Patent
active
055587275
ABSTRACT:
A high strength steel sheet for automobiles which exhibits excellent press-formability strength against impact resistance at a high strain rate is hot rolled under specific conditions, or is cold rolled from hot rolled sheet which is prepared under conventional conditions, with the cold rolled steel being annealed under specific conditions. The steel sheet comprises 0.010-0.10 wt % of C, not greater than 1.50 wt % of Si, 0.50-3.00 wt % of Mn, not greater than 0.010 wt % of S and 0.01-0.1 wt % of Al, and one kind or two kinds selected from 0.05-0.15 wt % of P and 0.5-1.5 wt % of Cr, and the balance being Fe and inevitable impurities and having a structure mainly composed of 2-30 vol % of martensite phase and a ferrite phase containing a solution C not greater than 0.0010 wt %.
REFERENCES:
patent: 4421573 (1983-12-01), Irie et al.
patent: 4561909 (1985-12-01), Sunami et al.
patent: 4790889 (1988-12-01), Maid et al.
Patent Abstracts of Japan vol. 9 No. 184, 30 Jul. 1985 & Japan 60052528 (Kawasaki Seitetsu) 25 Mar. 1985 abstract.
Patent Abstracts of Japan vol. 95, No. 2, 31 Mar. 1995 & Japan 06322476 (Kawasaki Steel Corp) 22 Nov. 1994 abstract.
Hira Takaaki
Kato Toshiyuki
Kurosawa Nobutaka
Miura Kazuya
Takagi Shusaku
Kawasaki Steel Corporation
Yee Deborah
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