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Abstract

The present invention provides an austenite-ferrite stainless steel. The steel composition contains in % by weight:

0.01%≦C≦0.10%20.0%≦Cr≦24.0%1.0%≦Ni≦3.0%0.12%≦N≦0.20%0.5%≦Mn≦2.0%1.6%≦Cu≦3.0%0.05%≦Mo≦1.0%W≦0.15%0.05%≦Mo+W/2≦1.0%0.2%≦Si≦1.5%Al≦0.05%V≦0.5%Nb≦0.5%Ti≦0.5%B≦0.003%Co≦0.5%REM≦0.1%Ca≦0.03%Mg≦0.1%Se≦0.005%O≦0.01%S≦0.030%P≦0.040%the rest being iron and impurities resulting from the production and the microstructure being composed of austenite and 35 to 65% ferrite by volume, the composition furthermore obeying the following relations:40≦IF≦65withIF=10% Cr+5.1% Mo+1.4% Mn+24.3% Si+35% Nb+71.5% Ti−595.4% C−245.1% N−9.3% Ni−3.3% Cu−99.8andIRCGCU≧32.0withIRCGCU=% Cr+3.3% Mo+2% Cu+16% N+2.6% Ni−0.7% Mnand0≦IU≦6.0withIU=3% Ni+% Cu+% Mn−100% C−25% N−2(% Cr+% Si)−6% Mo+45as well as a method of manufacture of plates, bands, coils, bars, wires, profiles, forged pieces and molded pieces of this steel.

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First Claim