| 摘要 |
PURPOSE:To obtain a ferritic-austenitic two-phase stainless steel with superior strength, toughness, corrosion resistance and hot workability by specifying the Cr and Ni contents of a Cr-Ni stainless steel and adding B, Cu, Al, etc. CONSTITUTION:A ferritic-austenitic two-phase stainless steel contg. <0.10%, preferably <=0.05% C, <1% Si, <2% Mn, 21-28% Cr, 4-7% Ni, 1.5-4% Mo, 0.0005-0.005% B, <1% Cu, <0.5% Al and <0.4% N is manufactured. The amount of Cr contained in the steel as a ferrite forming element is relatively larger than that of Ni as an austenite forming element, and the steel contains Cu as a substitute for Ni and an element for improving the corrosion resistance, Mo for improving the corrosion resistance and B for improving the hot workability. The steel is provided with superior strength by the precipitation of AlN.
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