HEAT-RESISTANT IRON-CHROME-NICKEL ALLOY Russian patent published in 2012 - IPC C22C38/58 C22C38/50 

FIELD: metallurgy.

SUBSTANCE: alloy contains chrome, nickel, carbon, silica, manganese, tungsten, titanium, molybdenum, aluminium, cerium, iron and impurities at the following component ratio, wt %: carbon 0.005 - 0.010, silica 0.20 - 0.40, manganese 1.00 - 2.00, chrome 16.0 - 18.0, nickel 34.0 - 38.0, tungsten 1.80 - 2.30, molybdenum 0.50 - 0.80, titanium 1.10 - 1.50, aluminium 0.08 - 0.15, cerium 0.05 - 0.10, iron and impurities are the rest. As impurities, the alloy contains sulphur, phosphorus, antimony, stannum, arsenic at their content, wt %: Sulphur ≤ 0.010, Phosphorus ≤ 0.015, Antimony ≤ 0.005, Stannum ≤ 0.003, Arsenic ≤ 0.005. At that, the following ratios shall be met: chrome equivalent Cr_equiv=Cr+2Si+1.5Mo+0.75W+5.5Al+1.5Ti≤25, nickel equivalent Ni_equiv=Ni+0.5Mn+30C≤40, total content of molybdenum and tungsten does not exceed 3 wt %, total content of impurities S+P+Sn+Sb+As is not more than 0.030 wt %.

EFFECT: increasing long-term strength level.

3 cl, 3 tbl