HIGH-GRADE DUPLEX STAINLESS STEEL WITH MUCH SUPPRESSED FORMATION OF INTERMETALLIC PHASES AND HAVING

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PROBLEM TO BE SOLVED : To provide high-grade duplex stainless steel having an excellent corrosion resistance, embrittlement resistance, castability and hot workability. SOLUTION : The high-grade duplex stainless steel has a chemical composition consisting, by weight, of 21.0-38.0% Cr, 3.0-12.0% Ni, 1.5-6.5% Mo, 0-6.5% W, 3.0% or less Si, 1.0% or less Al, 8.0% or less Mn, 0.2-0.7% N, 0.1% or less C, at least one element selected from the group consisting of 0.1% or less B, 3.0% or less Cu and 3.0% or less Co, and Mischmetal (MM) and/or 0.0001-1.0% Y in total, and the balance of iron and inevitable impurities. Formation of intermetallic phases such as sigma (σ) and khi (χ) deteriorating corrosion resistance and mechanical properties is suppressed. COPYRIGHT : (C)2011, JPO&INPIT