METHOD FOR REDUCING SEGREGATION IN WIRE ROD ROLLED FROM CONTINUOUSLY CAST BILLET

摘要

PROBLEM TO BE SOLVED: To provide a method for stabilizing quality of a wire rod by reducing segregation in the wire rod, with respect to a cast billet produced with a billet continuous caster.;SOLUTION: In the method for reducing the segregation in the wire rod, the wire rod is cooled at ≤10°C/sec cooling speed in temperature range from 1,050°C to 850°C by setting a rolling finished temperature in the wire rod rolling to ≥1,050°C. Further, the cooling speed from 1,050°C to 850°C according to the maximum segregation grain diameter in the billet measured in the cast billet and a target carbon segregation degree, is not higher than values obtained with the following equation (1). Equation (1) CR=D2×d²+D1×d+D0, D2=-430.9×C³+1027.8×C²+55.799×C-680.93, D1=343.32×C³-1855.5×C²+3157.4×C-1662, D0=97.648×C³-442.97×C²+654.05×C-310.89. Wherein, CR is the cooling speed (°C/sec), d is the segregation grain diameter (mm) and C is the target carbon segregation degree.;COPYRIGHT: (C)2003,JPO