C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/55
C21D 9/573 (2006.01) C21D 1/84 (2006.01)
Patent
CA 1196841
Abstract of the Disclosure A method of cooling band or hoop steels with hollow cooling rolls through which a cooling medium flows to absorb the heat of the steel strips trained about and in contact with the hollow cooling rolls, thereby cooling the steel strips. According to the invention this method is carried out so as to [ulfil the following equation (1) with the cooling roll having a diameter D>600 mm when a thickness h of the steel strip is within 0.2<h<0.6 mm, .DELTA.TS < 0.65 .sigma.T1.5 .theta. h-0.75 (1) and so as to fulfil the following equation (2) with the cooling roll having a diameter D>l,000 mm when a thickness h of the steel strip is within 0.6mm<h, .DELTA.TS < 1.05 ? .sigma.T1.5 ? .theta. ? h-0.83 (2) where .DELTA.TS is temperature fall °C per one cooling roll, .sigma.T is tensile stress in a lengthwise direction of the steel strip and .theta. is winding angle about the cooling roll.
431970
Hashimoto Osamu
Hyodo Kaneaki
Morimoto Kazuo
Murakami Shinjiro
Kawasaki Steel Corporation
Mitsubishi Heavy Industries Ltd.
Smart & Biggar
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