Metal treatment – Compositions – Heat treating
Patent
1985-04-15
1986-02-25
Stallard, Wayland
Metal treatment
Compositions
Heat treating
148 124, C21D 118, C21D 162
Patent
active
045727481
ABSTRACT:
The steel plate having a high tensile strength is manufactured from a steel consisting essentially of 0.04-0.16% by weight of C, 0.02-0.50% by weight of Si, 0.4-1.2% by weight of Mn, 0.2-5.0% by weight of Ni, 0.2-1.5% by weight of Cr, 0.2-1.0% by weight of Mo, 0.01-0.10% by weight of acid soluble Al, 0.03-0.15% by weight of one or more of V, Ti and Nb, 0.015% or less by weight of P, 0.006% or less by weight of S and the balance of iron and inherent impurities. The steel is heated to a temperature above a temperature at which carbo-nitrides of V and Nb and carbides of Ti become complete solid solution state, rolled with total reduction of 40% or more below 950.degree. C., quenched by simultaneous cooling immediately after completion of the rolling from a temperature above (A.sub.3 -50).degree.C. and tempered at a temperature lower than Ac.sub.1 temperature. The density of cooling water (W) for the quenching is detemined by the following equation (I) or (II) in accordance with the plate thickness (t):
REFERENCES:
patent: 4105474 (1978-08-01), Nakasugi et al.
patent: 4138278 (1979-02-01), Nakasugi et al.
patent: 4395296 (1983-07-01), Abrams
patent: 4397697 (1983-08-01), Freier et al.
Iwasaki Nobuhiro
Izawa Toru
Matsui Kazuyuki
Suga Masataka
Tagawa Hisatoshi
Nippon Kokan Kabushiki Kaisha
Stallard Wayland
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