| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferritic stainless steel cold rolled, annealed material in which secondary working embrittlement is suppressed even when subjected to secondary working under severe conditions, and which can be worked into a satisfactory product shape. SOLUTION: The ferritic stainless steel cold rolled, annealed material comprises≤0.015% C,≤0.5% Si,≤0.5% Mn,≤0.050% P,≤0.01% S, 10.0 to 23.0% Cr,≤0.10% Al,≤0.020% N, 0.10 to 0.25% Ti, 0.15 to 0.35% Nb and 0.0005 to 0.0035% B, and in which the mass ratio of Nb/Ti is≥0.9, and the minimum Lankford value r<SB>min</SB>in all the directions is≥1.8. The ferritic stainless steel cold rolled, annealed material is produced by subjecting a hot rolled steel strip to annealing so as to be heated in the temperature range of 700 to 950°C for≤1 hr, subjecting the hot rolled steel strip to intermediate cold rolling, thereafter performing process annealing so as to be heated in the temperature range of (a recrystallization temperature-100°C) to a recrystallization completion temperature for≤1 min, and performing finish cold rolling at a rolling ratio of≥80%. COPYRIGHT: (C)2004,JPO
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