Use of an iron-chromium-nickel alloy in articles presenting a high creep rupture strength, a good corrosion resistance and having a high texture stability

摘要

1. use of an alloy of the composition 0.05 to 0.15 % of carbon, up to 1.5 % of silicon, up to 1.5 % of manganese, 18 to 25 % of chromium, 30 to 36 % of nickel, 9 to 16 % of tungsten, 0.7 to 1.3 % of niobium and 0.000 4 to 0.007 % of boron, the remainder being iron and unavoidable impurities, in which alloy, however, in order to avoid carburisation or decarburisation in atmospheres of low oxygen partial pressure, the tungsten and niobium contents (mass contents in %) are matched in such a way that the condition % W + 2 . (% Nb) = 12 à 17 % is fulfilled, the 1.000 hours creep strength at 950 degrees C being on average 35 N/mm**2, as a material for components which are subjected to long-term stresses ans must have a high creep strenght, good structural stability and high corrosion resistance under high-temperature stresses.