STAINLESS STEEL PRODUCED BY DUPLEX PROCESS Russian patent published in 2010 - IPC C22C38/58 C22C38/52 C21D8/02 C21D8/06 

FIELD: metallurgy.

SUBSTANCE: invention refers to stainless steel produced by duplex process. Steel is designed for fabrication of elements of structures for installations generating power and producing materials in chemical, oil-chemical and papermaking industries Steel contains the following elements, wt %: C ≤ 0.05, 21 ≤ Cr ≤ 25, 1 ≤ Ni ≤ 2.95, 0.16 ≤ N ≤ 0.28, Mn ≤ 2.0, Mo + W/2 ≤ 0.50, Mo ≤ 0.45, W ≤ 0.15, Si ≤ 1.4, Al ≤ 0.05, 0.11 ≤ Cu ≤ 0.50, S ≤ 0.010, P ≤ 0.040, Co ≤ 0.5, P3M ≤ 0.1, V ≤ 0.5, Ti ≤ 0.1, Nb ≤ 0.3, Mg ≤ 0.1, the rest - iron and additives at melting; also microstructure of steel consists of austenite and 35-65 vol. % of ferrite. Composition of steel corresponds to dependencies: 40 ≤ IF ≤ 70, where: IF=6×(% Cr + 1.32×% Mo + 1.72×% Si) - 10×(% Ni + 24× % C + 16.15×% N×0.5×% Cu + 0.4×% Mn) - 6.17 and IRCL ≥ 30.05 where: IRCL=% Cr + 3.3×% Mo + 16×%N + 2.6×% Ni - 0.7×% Mn. Sheets, strips, bands, rods, wires, profiles, forged pieces and casts are made out of this steel.

EFFECT: improved properties of steel.

28 cl, 5 dwg, 7 tbl, 1 ex