| 简介 |
PROBLEM TO BE SOLVED : To provide a low-alloy high-purity ferritic stainless steel sheet provided with improved oxidation resistance and high-temperature strength by utilizing Sn addition in trace amounts, without relying on excessive alloying of Al and Si which reduces fabricability and weldability or addition of rare elements such as Nb, Mo, W, and rare earths, and to provide a method for producing the same.
SOLUTION : A high-purity ferritic stainless steel sheet includes, by mass : 0.001 to 0.03% of C, 0.01 to 2% of Si, 0.01 to 1.5% of Mn, 0.005 to 0.05% of P, 0.0001 to 0.01% of S, 16 to 30% of Cr, 0.001 to 0.03% of N, 0.05 to 0.8% of Al, and 0.01 to 1% of Sn, with the balance comprising Fe and unavoidable impurities. A stainless steel slab having such steel components is heated, wherein an extraction temperature is 1, 100 to 1, 250°C, and a winding temperature after hot rolling is 650°C or lower. A hot-rolled sheet is annealed at 900 to 1, 050°C, and cooled at 10°C/sec or less over a temperature range of 550 to 850°C.
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