| 摘要 |
PROBLEM TO BE SOLVED: To stably manufacture hot-rolled steel products having high-quality surface properties without defects by surely on-line removed mold powder for continuous casting which is present in the outer layer part of a material to be rolled such as a cast slab, inclusions and grain boundary oxides. SOLUTION: In a method for manufacturing the hot-rolled steel products by performing finish rolling after rough rolling the cast slab after casting, at least in one among stages (A): after casting and before rough rolling, (B): on the way of the rough rolling and (C): after rough rolling and before finish rolling, this equipment is provided with a cutting/repairing stage for cutting and removing the part or the whole of the outer layer parts of the surface or the back face of the material to be rolled in the hot state. In the cutting/repairing stage, the steel part of≥100 mm thick exceeding the oxidized film on the surface of the material to be rolled is cut and removed, preferably, the outer layer part of the material to be rolled is cut while revolving a cutting edge by cutting reaction force from the material to be rolled by using the revolvable cutting edge having a circular cutting blade as a cutting means in the cutting/repairing stage. COPYRIGHT: (C)2004,JPO
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