HIGH-TEMPERATURE ALLOY Russian patent published in 2016 - IPC C22C19/05 C22C30/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, in particular to heat resistant alloys, and may be used in manufacture of pipes, sheets, forgings, and others, metal-rolling for heat exchange, etc., equipment operating in corrosive environments, as well as vessels and vehicles operating at high pressure in temperature range from minus 196 °C to plus 450 °C. Heat-resistant alloy contains components in following ratio, wt%: carbon ≤ 0.10; chrome 20.5÷23.5; silicon ≤ 0.60; manganese ≤ 0.60; niobium 3.05÷4.20; cobalt ≤ 1.1; titanium ≤ 0.45; aluminium ≤ 0.45; yttrium > 0÷0.001; oxygen > 0.0005÷0.018; hydrogen > 0.0005÷0.0017; nitrogen > 0.0005÷0.050; sulphur ≤ 0.013; phosphorus ≤ 0.013; lead ≤ 0.009; tin ≤ 0.009; arsenic ≤ 0.009; zinc ≤ 0.009; antimony ≤ 0.009; molybdenum 7.9÷10.1; iron ≤ 5.1; nickel - balance. For content of sulphur and phosphorus condition is satisfied (S+P) ≤ 0.020, and for ratio of chromium and nickel following condition is satisfied, wt%: (Cr_e/Ni_e) ≥ 0.537, where: Cr_e - equivalent of chromium; Ni_e - equivalent of nickel; Cr_e=%Cr+2×%Al+3×%Ti+%Mo+l,6×%Si+0,6%Nb; Ni_e=%Ni+32%C+0,6×%Mn+%Co+22×%N.

EFFECT: increased structural stability of alloy in process of ageing, as well as reduced tendency to formation of hot cracks during welding.

3 cl