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High-quality a duplex stainless steel with a greatly suppressed formation of intermetallic phases and excellent resistance to corrosion, brittleness, castability and workability
High-quality a duplex stainless steel with a greatly suppressed formation of intermetallic phases and excellent resistance to corrosion, brittleness, castability and workability
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机译：高质量双相不锈钢，大大抑制了金属间相的形成，并具有出色的耐腐蚀性，脆性，可铸性和可加工性
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摘要
Formation of intermetallic phases such as sigma (σ) and khi (χ) shows detrimental effects on the corrosion and mechanical properties of high-grade duplex stainless steel. The present invention provides high-grade duplex stainless steel with much suppressed formation of intermetallic phases, of which the chemical composition consists essentially, on a weight basis, of : Cr : 21.0% ~ 38.0%, Ni : 3.0% ~ 12.0%, Mo : 1.5% ~.6.5%, W : 6.5% or less, Si : 3.0% or less, Mn : 8.0% or less, N : 0.2% ~ 0.7%, C :0.1% or less, at least one element selected from the group consisting of Ba : 0.0001 ~ 0.6% and one or more elements of Mischmetal (MM) and Y : 0.0001 ~ 1.0% in total, and a balance of Fe and incidental impurities. The pitting resistance equivalent has a value of 40 ≤ PREW≤ 67 defined by the following formula (1) : PREW = wt.%Cr + 3.3(wt.%Mo + 0.5wt.%W) + 30wt.%N -------(1) The present high-grade duplex stainless steel exhibits an excellent corrosion resistance, embrittlement resistance, castability and hot workability.
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