Abstract: A stainless steel having a two-phase structure of austenite and ferrite, the steel consisting essentially of in weight-% not more than 0.03% C, not more than 0.03% N, the total amount of C+N not being more than 0.05%, 1.5-2.5% Si, 0.5-2% Mn, not more than 0.03% P, not more than 0.010% S, 22-26% Cr, 8-11% Ni, 2-3% Mo, 0.35-0.55% Ti, % Cr+3.3.times.% Mo being at least 29.0, balance iron and impurities, said steel having been subjected to a heat treatment consisting of solution annealing in the temperature range 1100.degree.-1250.degree. C. and water quenching followed by aging in a temperature range 500.degree.-600.degree. C. for at least 30 min, wherein precipitates consisting essentially of Ni.sub.16 Ti.sub.6 Si.sub.7, so called G-phase, are precipitated in the form of particles evenly distibuted in the ferrite, said particles typically having a size of 10-50 .ANG.

Abstract: The invention relates to an austenitic stainless steel having a high tensile strength, a high impact strength, a good weldability and a high corrosion resistance, particularly a high resistance to pitting and crevice corrosion. The steel contains in weight-%:max 0.08 Cmax 1.0 Simore than 0.5 but less than 6 Mnmore than 19 but not more than 28 Crmore than 17 but not more than 25 Nimore than 7 but not more than 10 Mo0.4-0.7 Nfrom traces up to 2 Cu0-0.2 Cebalance essentially only iron, impurities and accessory elements in normal amounts.

Abstract: An iron, nickel-, chromium base alloy having an austenitic structure, good high temperature features, including a very high resistance to oxidization in an oxidizing atmosphere and to carburization in a carborizing atmosphere at high temperatures, and a high creep fracture resistance. The alloy has the following composition in weight percent: 0.01-0.08 carbon, 1.2-2.0 silicon, from traces up to 2 manganese, 22-29 chromium, 32-38 nickel, 0.01-0.15 rare earth metals, 0.08-0.25 nitrogen, with the balance essentially of only iron and unavoidable impurities and normally occurring accessory elements in normal amounts. The rare earth metals in combination with the silicon content serve to improve the growth of a protecting silicon dioxide-layer on the metal surface, when the metal surface is subjected to high temperatures in oxidizing atmospheres. This counteracts the transportation of metal irons, in particular chromium, out of the alloy so that scaling is minimized.