Nickel chromium alloy
A nickel chromium alloy comprising 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, and 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,
0.01 to 0.6% tungsten 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 , said alloy further comprising:
0.01 to 0.5% molybdenum by weight.
3. The alloy of claim 2 , said alloy further comprising:
0.01 to 0.5% tantalum by weight.
4. The alloy of claim 1 , wherein said alloy comprises 0.01 to 0.5% manganese by weight.
5. The alloy of claim 1 , wherein said alloy comprises 0.06 to 0.11% zirconium by weight.
6. The alloy of claim 5 , said alloy further comprising:
0.01 to 0.06% cobalt by weight.
7. 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,
0.01 to 0.5% molybdenum 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.
8. The alloy of claim 7 , said alloy further comprising:
0.01 to 0.5% tantalum by weight.
9. The alloy of claim 7 , wherein said alloy comprises 0.01 to 0.5% manganese by weight.
10. The alloy of claim 7 , said alloy further comprising:
0.01 to 1.5% tantalum by weight, and
0.01 to 1.0% tungsten by weight.
11. The alloy of claim 7 , said alloy further comprising:
0.01 to 1.0% tungsten by weight, and
0.06 to 0.11% zirconium by weight.
12. The alloy of claim 11 , said alloy further comprising:
0.01 to 0.06% cobalt by weight.
13. 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,
0.01 to 0.5% tantalum 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.
14. The alloy of claim 13 , said alloy further comprising:
0.01 to 0.6% tungsten by weight.
15. The alloy of claim 13 , wherein said alloy comprises 0.01 to 0.5% manganese by weight.
16. The alloy of claim 13 , said alloy further comprising:
0.01 to 1.0% tungsten by weight.
17. The alloy of claim 13 , said alloy further comprising:
0.01 to 1.0% tungsten by weight, and
0.06 to 0.11% zirconium by weight.
18. The alloy of claim 17 , said alloy further comprising:
0.01 to 0.06% cobalt by weight.
19. 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,
0.001 to 0.1% nitrogen by weight, and
nickel with melt-induced impurities.