Austenitisk-ferritisk rustfrit stål med forbedret bearbejdelighed

摘要

The invention concerns an austenite-ferrite stainless steel composition, whose 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% 5 Mo 5 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@65 with IF=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-99.8 and IRCGCU>=32.0 with IRCGCU=%Cr+3.3%Mo+2%Cu+16%N+2.6%Ni-0.7%Mn and 0@IU@6.0 with IU=3%Ni+%Cu+%Mn-100%C-25%N-2(%Cr+%Si)-6%Mo+45 as well as a method of manufacture of plates, bands, coils, bars, wires, profiles, forged pieces and molded pieces of this steel.