METHOD FOR CASTING NB-CONTAINING FERRITIC STAINLESS STEEL BY TWIN ROLL CONTINUOUS CASTING METHOD

摘要

PURPOSE: To provide a casting method, by which surface crack on a cast strip can be reduced to a practically allowable extent, related to the method for casting an Nb-containing ferritic stainless steel by a twin roll continuous casting method. ;CONSTITUTION: In the method for casting the ferritic stainless steel containing 0.001-0.03wt.% C, 0.2-1.0% Si, 0.05-0.8% Mn, ≤0.03% P, ≤0.01% S, 0.1-5.0% Nb and 0.001-0.03% N into the cast strip having 1-6mm thickness by the twin roll type continuous casting method, the cooling speed of the cast strip is set at ≥10000°C/min from the time when the cast strip comes out from the cooling rolls to the time when the temp. lowers to 1200°C and at ≥1500°C/min from 1200°C to 800°C and thereafter, water cooling is executed to prevent the precipitation and the growth of NbCN at high temp.;COPYRIGHT: (C)1994,JPO&Japio