CONTINUOUS CASTING METHOD FOR STEEL

摘要

PURPOSE:To improve the removability of primary scale by adding S and P alone or the compd. thereof into mold powder for continuous casting to adjust the contents of S and P within a specific range and to form thickened S and P layers on the surface layer part of the steel ingot to be produced. CONSTITUTION:The mold powder added with the S and P alone or the compd. thereof in a 0.1-10wt% range in the content of S and P is introduced to the surface of the molten steel in a casting mold and the continuous casting is executed, by which the steel ingot 2 having the thickened layer 12 of the S and P on the surface layer part is obtd. The primary scale 4 is formed on the surface layer part of the ingot 2 in the mid-way of conveyance in the red hot state or in a heating furnace, by which the thickened layer 12 interposed at the boundary between the ingot 2 and the scale 4 is made extremely difficult to be stripped. The removability of the primary scale formed on the ingot is thus remarkably improved and the various defects during rolling arising from the remaining scale are eliminated.