C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.4
C21D 9/52 (2006.01) C21D 9/573 (2006.01)
Patent
CA 1281974
60-289,320 STEEL STRIP COOLING METHOD Abstract of the Disclosure A method of rapidly cooling steel strips heated and soaked in a continuous heat-treatment furnace. The rapidly cooling is carried out by winding a steel strip about a plurality of cooling rolls in succession to bring the steel strips into contact therewith. The rapid cooling is started at a temperature of a range of 550-720°C and simultaneously a tensile force .alpha. (kgf/mm2) of the steel strip is adjusted within a range determined by an inequality of (1900-Ts)/1670<.alpha.<(1980-Ts)/720 according to the starting temperature Ts(°C) of the rapid cooling. In another aspect, the rapid cooling is carried out by winding the steel strip about a plurality of cooling rolls in suc- cession to bring the steel strip into contact therewith and at the same time by jetting a gas against a back surface of the steel strip. The rapid cooling is started at a temperature of a range of 550-720°C and simultaneously a tensile force .alpha.' (kgf/mm2) of the steel strip is adjusted within a range determined by an in- equality of (1570-Ts)/1670<.alpha.'<(2410-Ts)/630 according to the starting temperature Ts(°C) of the rapid cooling.
525985
Iida Sachihiro
Mega Setsuo
Kawasaki Steel Corporation
Smart & Biggar
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