Production method of ultra-low carbon cold-rolled steel sheet

摘要

PROBLEM TO BE SOLVED: To provide an effective producing method for an extra-low carbon cold-rolled steel sheet which does not develops the clogging of a nozzle in a continuous casting of a Ti-containing aluminum killed steel and also, the surface defect on a cast slab. ;SOLUTION: Molten steel having main components of inclusion as compound oxide of Ti and Al, Ti and Si or Ti, Al and Si is produced by adding Al and/or Si into the molten steel after decarburized treatment to execute half-deoxidation and successively, by adding Ti-containing material to further execute the deoxidation. Successively, this molten steel is continuously cast, hot-rolled and cold- rolled and thereafter, continuous annealing is executed in the temp. range of 700°C-Ac₃ point.;COPYRIGHT: (C)1997,JPO