| 摘要 |
A ferritic stainless steel sheet has a composition of C up to 0.02 mass %, Si up to 0.8 mass %, Mn up to 1.5 mass %, P up to 0.050 mass %, S up to 0.01 mass %, 8.0-35.0 mass % of Cr, N up to 0.05 mass %, 0.05-0.40 mass % of Ti and 0.10-0.50 mass % of Nb with a product of (%Tix%N) less than 0.005. Precipitates of 0.15 mu m or more in particle size except TiN are distributed in a steel matrix at a rate of 5000-50000/mm<2>. The steel sheet is manufactured by hot-rolling a slab at a finish-temperature of 800 DEG C or lower, annealing the hot-rolled steel sheet at 450-1080 DEG C, cold-rolling the hot-rolled steel sheet in accompaniment with intermediate-annealing at a temperature within a range of from (a recrystallization-finishing temperature -100 DEG C) to (a recrystallization-finishing temperature) and then finish-annealing the cold-rolled steel sheet at 1080 DEG C or lower. The ferritic stainless steel sheet is press-formed with high dimensional accuracy and excellent secondary formability due to controlled distribution of the precipitates. <IMAGE> |
