| 摘要 |
PROBLEM TO BE SOLVED: To provide a cast slab capable of attaining the conditions of inclusions in the cast slab for preventing inclusion-induced defects in a sheet product and also to provide a method for manufacturing the cast slab. SOLUTION: Prior to the addition of a deoxidizer to molten steel, oxygen content in the molten steel is controlled to a prescribed value or below by means of C deoxidation in a reduced-pressure atmosphere or trace amounts of Al and then the deoxidizers are added in the form of metal or alloy in the order of Ti, Al, Ca. Accordingly, the cast slab which is practically free from inclusion-induced defects at product working, particularly the cast slab in which the number of >=20μm inclusions is minimized, i.e., inclusion-induced defects are removed, and the manufacturing method thereof can be provided.
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