Nickel-chromium-alloy
A nickel chromium alloy with 0.4 to 0.6% carbon, 28 to 33% chromium, 15 to 25% iron, 2 to 6% aluminum, up to 2% silicon, up to 2% manganese, up to 1.5% niobium, up to 1.5% tantalum, up to 1.0% tungsten, up to 1.0% titanium, up to 1.0% zirconium, up to 0.5% yttrium, up to 0.1% nitrogen, remainder nickel, has a high oxidation and carburization stability, long-term rupture strength and creep resistance. This alloy is particularly suited as a material for components of petrochemical plants and for parts, for example tube coils of cracker and reformer furnaces, pre-heaters, and reformer tubes, as well as for use for parts of iron ore direct reduction plants.
1. A nickel-chromium alloy, comprising:
0.4 to 0.6% carbon by weight,
28 to 33% chromium by weight,
17 to 22% iron by weight,
3 to 4.5% aluminum by weight,
0.01 to 1% silicon by weight,
0.01 to 2% manganese by weight,
0.01 to 1.0% niobium by weight,
0.001 to 0.5% titanium by weight,
0.001 to 0.3% zirconium by weight,
0.001 to 0.3% yttrium by weight, and
0.001 to 0.1% nitrogen by weight,
remainder nickel with melt-induced impurities.
2. The alloy of claim 1 , wherein said alloy comprises
0.01 to 0.5% manganese by weight.
3. The alloy of claim 1 , said alloy further comprising:
0.01 to 1.5% tantalum by weight, and
0.01 to 1.0% tungsten by weight.
4. The alloy of claim 1 , said alloy further comprising:
0.01 to 1.0% tungsten by weight, and
0.06 to 0.11% zirconium by weight.
5. The alloy of claim 4 , said alloy further comprising:
0.01 to 0.06% cobalt by weight.