Austenitic steel

A steel consisting essentially of iron, ferrite-forming components and austenite-forming components, the ferrite-forming components comprising silicon and chromium, the austenite-forming components comprising carbon, nitrogen and manganese, the ferrite-forming components and austenite-forming components being present in the steel in respective amounts such that:

• 0.48 ⁢ [Si] + [Cr] 30 ⁢ [C] + 18 ⁢ [N] + 0.01 ⁢ [Mn] = from ⁢ ⁢ 0.8 ⁢ ⁢ to ⁢ ⁢ 1.3 ,
• wherein the ferrite-forming and austenite-forming components are present in the steel in respective amounts such that the steel has a single-phase austenitic structure, a yield point σ0.2 from 700 to 900 MPa, and a breaking point σB from 1100 to 1250 MPa, with the carbon being present in the steel in an amount of 0.01 to 0.04 wt %, the chromium being present in the steel in an amount of 21.00 to 24.00 wt %, the silicon being present in the steel in an amount of 0.25 to 0.65 wt %, the manganese being present in the steel in an amount of up to 0.70 wt %, and the nitrogen being present in the steel in an amount of 1.00 to 1.4 wt %.