| 摘要 |
PROBLEM TO BE SOLVED: To provide a mold for continuously casting steel so as not to generate a longitudinal crack, rhombic deformation etc., causing the deterioration of quality by promoting the generation of a solidified shell and uniformizing the thickness of the solidified shell. SOLUTION: Cross sectional shape in a mold main body part 1 of a mold for continuously casting is a quadrangle connecting four straight line sides with four of 1/4 circular arcs, the inner circumferential length is long at the upper end side of the mole main body part 1 and short at the lower end side and the reducing ratio of the inner circumferential length is reduced from the upper end toward the lower end of the mold main body part 1. This inner circumferential length is changed with only a tapered amt. in the mold main body part 1 or with the both of the tapered amt. and the radius of the 1/4 circular arc. This mold MD for continuously casting is used and the surface of molten steel is displaced in the vertical direction and a mold part having the approximately same inner circumferential length as shrunk outer shape at the initial stage of solidification of a cast billet is used so as to keep the contact state of the solidified shell with a mold copper plate to an optimum condition.
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