C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
80/4, 341/15.1
C21D 9/573 (2006.01) B21B 37/76 (2006.01) C21D 1/54 (2006.01) C21D 8/02 (2006.01) C21D 11/00 (2006.01)
Patent
CA 1229145
ABSTRACT OF THE DISCLOSURE: A method of and a system for controlling the cooling of a hot-rolled steel sheet after hot rolling. The method comprises: determining a target value of a transfor- mation rate required for obtaining mechanical properties ultimately expected from the hot-rolled steel sheet; determining the fraction of gamma to alpha transformation of the hot-rolled steel sheet, in a section in which the cooling is controlled, by at least one transformed fraction detector; and measuring an elapsed time from the start of cooling. Then, calculating the transformation rate of the steel sheet in the cooling stage from the gamma to alpha transformed fraction and the elapsed time; and controlling the conditions of cooling so that the transformation rate in the cooling stage coincides with the target value.
480904
Hashimoto Osamu
Morita Masahiko
Kawasaki Steel Corporation
Robic Robic & Associes/associates
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