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

FIELD: metallurgy.

SUBSTANCE: invention relates to a low carbon nickel-chromium alloy, and may be used in chemical and refining industries in processes containing chlorides, when working in hot crude mineral and organic acids solutions, as well as in seawater, as well as vessels and devices operating at high pressure in a temperature range from minus 196 °C to plus 450 °C. Products made of said alloy can be used both at room and at elevated temperatures of up to plus 650 °C at a pressure up to 50 atm. Heat-resistant alloy contains, wt%: carbon ≤ 0.0095; chrome 14.4÷16.6; silicon ≤ 0.08; manganese ≤ 1.0; vanadium ≤ 0.34; tungsten 3.1÷4.4; cobalt ≤ 2.4; iron 4.1÷6.9; yttrium > 0÷0.001; oxygen > 0.0005÷0.018; hydrogen > 0.0005÷0.0017; nitrogen > 0.0005÷0.050; sulphur ≤ 0.010; phosphorus ≤ 0.020; lead ≤ 0.009; tin ≤ 0.009; arsenic ≤ 0.009; zinc ≤ 0.009; antimony ≤ 0.009; molybdenum 15.2÷17.1, nickel - balance, with following conditions being satisfied, wt%: (Cr_E/ Ni_E)≥0.57, where: Cr_E is equivalent of chromium; Ni_E is equivalent of nickel; Cr_E=Cr+V+Mo+1.6×Si+W; Ni_E=Ni+32C+0.6×Mn+22×N. For total content of sulphur and phosphorus, following condition is satisfied (S + P) ≤ 0.020.

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

2 cl