HIGH-PURITY FERRITIC STAINLESS STEEL SHEET WITH EXCELLENT OXIDATION RESISTANCE AND HIGH-TEMPERATURE

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PROBLEM TO BE SOLVED : To provide a low-alloy type high-purity ferritic stainless steel sheet improved in 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 manufacturability and welding properties, or upon the addition of scarce elements such as Nb, Mo, W, or rare earths, and to provide a method for manufacturing the same. SOLUTION : The high-purity ferritic stainless steel sheet includes, expressed in terms of mass%, 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 : 0.001-0.03%, Al : 0.05-0.8%, 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 1, 100-1, 250°C, and the winding temperature subsequent to completion of hot rolling is brought to 650°C or lower. Annealing of the hot-rolled sheet is carried out at 900-1, 050°C, followed by cooling to a temperature zone of 550-850°C at 10°C/sec or less. COPYRIGHT : (C)2012, JPO&INPIT