| 摘要 |
PURPOSE:To vanish the center segregation by heating molten steel in a mold for continuous casting and also drawing from the mold at the specific speed in the continuous casting for the molten steel. CONSTITUTION:At the time of producing the steels, such as high tensile strength steel sheets, rolled steels for welded structure, etc., by the continuous casting method, the molten steel is cast into the mold 12 for the continuous casting through a submerged nozzle 16 of a tundish and is drawn as a continuous casting slab, from the mold 12 at <=0.3m/min slow casting speed by pinch rolls, as supporting by supporting guide rolls 18 and as cooling by cooling water spray nozzles 22. In this case, a heating device is fitted on the mold 12, to heat the molten steel temp. in the mold to >=50 deg.C higher than this melting point. By slow drawing speed for the continuous casting slab and high molten steel temp. in the mold, as the depth from the mold to a crater end 24 of the continuous casting slab is made to shallow and the angle of the solidified face in here 24 is made to wide, the development of the center segregation, getting together impurities is prevented. Thus, the continuous casting slab having excellent quality is formed.
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