具优异耐氧化性与高温强度之高纯度肥粒铁系不锈钢板及其制造方法

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The present invention provides a low-alloy type, high-purity ferritic stainless steel sheet endowed with improved oxidation resistance and high-temperature strength through the addition of a trace amount of Sn, without reliance upon excessive alloying of Al and/or Si, which hamper productivity and welding properties, or upon the addition of scarce elements such as Nb, Mo, W, or rare earths. To do so, the high-purity ferritic stainless steel sheet comprises, expressed in terms of mass percent, C : 0.001-0.03%, Si : 0.01-2%, Mn : 0.01-1.5%, P : 0.005-0.05%, S : 0.0001-0.01%, Cr : 16-30%, N : 0.001-0.3%, Al : 0.05-3%, and Sn : 0.01-1%, with the remainder being Fe and unavoidable impurities. A stainless steel slab having these steel components is heated to an extraction temperature of 1100-1250 C, and the winding temperature subsequent to completion of hot rolling is brought to 600 C or lower. Annealing of the hot-rolled sheet is carried out at 900-1050 C, followed by cooling to a temperature zone of 550-850 C at 10 C/sec or less.