CONTINUOUS CASTING METHOD OF STEEL

摘要

PURPOSE:To decrease easily and considerably the central segregation to be generated in an ingot by specifying the product of the thickness of a mold and the drawing speed of the ingot and the range of the inclination angle of the ingot in accordance with the bending radius of the ingot. CONSTITUTION:A molten steel 2 is continuously cast into the mold 1 and the unsolidified ingot 3 is continuously drawn from the lower part of the mold 1 to produce the ingot. The product V.D of the thickness Dmm of the mold and the drawing speed V(mm/min) of the ingot is specified to <=1.0X10<5> mm<2>.min<-2> in this stage. The bending radius of the ingot is set within a 1.5-5m range and the inclination angle theta of the ingot determined by the tangent land vertical line G at the crater end A is maintained within a 45-135 deg. range. The multi-point straightening of the ingot is made possible so as to keep the surface strain of the ingot at about <=1.5% by the above-mentioned method, by which the generation of the central segregation of the ingot is decreased.