| 摘要 |
PURPOSE:To obtain a corrosion resistant alloy steel plate having excellent processability by cold rolling a steel contg. essentially C, Cr, solAl and P and subjecting the steel to final annealing in a specific temp. range by using a box type annealing furnace. CONSTITUTION:A steel contg. <=0.05wt% C, 10.00-18.00% Cr, 0.005-0.50% solAl, >0.040-0.150% P and if necessary, contg. a specific amt. of Si, Mn, S, Ni, Mo, Cu and Ti, etc. is melted. Such steel is hot-rolled and any of non- annealing, box annealing at a heating rate of <=300 deg.C/hour or continuous annealing at a heating rate of >=200 deg.C/min is adopted. If necessary, cold rolling including intermediate annealing is performed. The steel is then subjected to the final annealing in a box annealing furnace wherein the steel is heated in a 650-900 deg.C range at a heating rate of <=300 deg.C/hour in a temp. region of >=300 deg.C. A corrosion resistant alloy steel plate having improved processability is obtd. by the above-mentioned treatment. |
