CASTING MOLD FOR CONTINUOUS CASTING AND CONTINUOUS CASTING METHOD OF STEEL

摘要

To prevent surface cracking due to uneven cooling of solidified shell on an initial solidification stage and surface cracking due to unevenness of solidified shell thickness caused by transformation from δ iron to γ iron in medium carbon steel.SOLUTION: A casting mold for continuous casting according to the present invention includes, in a prescribed range of an inner wall surface of a water-cooled copper alloy casting mold, a dissimilar substance-filled part in which metal or nonmetal having a thermal conductivity different from a thermal conductivity of casting mold copper plate is filled 1. Heat resistance R(m×K/W) between a casting mold copper plate surface and a slit of the casting mold copper plate as a flow channel of casting mold cooling water on an installation position of the dissimilar substance filled part falls into the range of the following relation (1) and the ratio (λ/λ) of thermal conductivity λof the casting mold copper plate to thermal conductivity λma of the metal or nonmetal is larger than 0.2 and is less than 20.0 (however, such a case that λ=λis excluded):1.0×10R6.0×10...(1).SELECTED DRAWING: Figure 4