摘要:
The invention provides a low thermal expansion alloy which has an excellent high-temperature strength, a low coefficient of thermal expansion and a high notch rupture strength so that the alloy will be the most suitable as a material for components of a gas turbine or as a material connected with a low thermal expansion material. The alloy consists essentially of, by weight, 0.2 % or less carbon, 1.0 % or less silicon, 1.0 % or less manganese, 0.5 to 2.95 % chromium, 0.25 to 1.0 % aluminum, 0.5 to 2.5 % titanium, one or both of niobium and tantalum in the range of 3.0 % ≦ Nb+[Ta/2] ≦ 6.0 %, 0.02 % or less boron, 24 to 29.8 % nickel, 20 to 28 % cobalt, and the balance of iron.