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Abstract

The invention relates to a duplex stainless steel composition, the composition of which consists of, in % by weight: C.ltoreq.0.05% 21%.ltoreq.Cr.ltoreq.25% 1%.ltoreq.Ni.ltoreq.2.95% 0.16%.ltoreq.N.ltoreq.0.28% Mn.ltoreq.2.0% Mo+W/2.ltoreq.0.50% Mo.ltoreq.0.45% W.ltoreq.0.15% Si.ltoreq.1.4% Al.ltoreq.0.05% 0.11%.ltoreq.Cu.ltoreq.0.50% S.ltoreq.0.010% P.ltoreq.0.040% Co.ltoreq.0.5% REM.ltoreq.0.1% V.ltoreq.0.5% Ti.ltoreq.0.1% Nb.ltoreq. 0.3% Mg.ltoreq.0.1% the balance being iron and impurities resulting from the smelting, and the microstructure consisting of austenite and 35 to 65% ferrite by volume, the composition furthermore satisfying the following relationships: 40.ltoreq.I.sub.F.ltoreq.70 where I.sub.F=6.times.(% Cr+1.32.times.% Mo+1.27.times.% Si)-10.times.(% Ni+24.times.% C+16.15.times.% N+0.5.times.% Cu+0.4.times.% Mn)-6.17 and I.sub.LCR.gtoreq.30.5 where I.sub.LCR=% Cr+3.3.times.% Mo+16.times.% N+2.6.times.% Ni-0.7.times.% Mn, and also to a process for manufacturing plate, strip, coil, bar, rod, wire, sections, forgings and castings made of this steel.

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First Claim