When in the tundish where the molten steel of treatment mannered null preferential charge

摘要

PROBLEM TO BE SOLVED: To provide a method for treating a seam part slab with which the length of component mixing region of succeeding charge can concretely be obtained by using a calculating formula when sequentially casting different steels.;SOLUTION: When performing the continuous casting by pouring the molten steels different in components into a tundish remaining a preceding molten steel as the succeeding charge, the slab position corresponding to the molten steel surface position at the time point of pouring the succeeding charge into the tundish is defined as a basic position, and the slab of the succeeding charge up to the range of the slab length (L) calculated with a (1) formula from the basic position is treated as scrap. Wherein, in the (1) formula of L=(a×W_TD+b)/(S_ST×ρ)+c, L is the slab length (m); W_TD is the remained molten steel quantity (ton) in the tundish at the time point of starting the pouring of the following successive molten steel; S_ST is the total value (m²) of the cross sectional area of the slab; ρ is density (ton/m³) of the slab; a, b, c are independently factors; and they are preferrably set to a=1.39, b=0 and c=0.8.;COPYRIGHT: (C)2009,JPO&INPIT