B - Operations – Transporting – 22 – D
Patent
B - Operations, Transporting
22
D
22/167
B22D 27/02 (2006.01) B22D 11/11 (2006.01) B22D 11/115 (2006.01)
Patent
CA 1152723
-49- PROCESS FOR CONTINUOUS CASTING OF A SLIGHTLY DEOXIDIZED STEEL SLAB ABSTRACT OF THE DISCLOSURE In the continuous casting of steel, it has been possible to produce killed steel industrially, but semikilled and rimmed steel have not been successfully produced due to rimming action occuring in the oscillating mold. The present invention involves a concept of suppressing the nuclei of bubbles which will later grow into CO bubbles. In order to suppress the nuclei of bubbles and to form a non-defective solidification layer of a continuously cast strand, the present invention provides a combination of: a free oxygen concentration of from 50 to 200 ppm in the molten steel; a concave shape at the short sides of the mold; a propulsion forces of the molten steel directed along the long sides of the mold in directions opposite to one another; subjecting a solidification interface to an electromagnetic flow having a speed of from 0.1 to 1.0 m/sec, and; solidifying the molten steel at the solidification interface under the influence of the electro- -magnetic flow, until a non-defective solidification layer without blow holes is obtained.
338725
Fujii Hiromu
Kitamura Osamu
Mineyuki Seizo
Ohashi Tetsuro
Takeuchi Eiichi
Goudreau Gage Dubuc
Nippon Steel Corporation
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