| 简介 |
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. |
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