Nickel base wrought alloy
View Patent ↗A nickel base alloy includes: by mass, 0.001 to 0.1% of carbon; 12 to 23% of chromium; 15 to 25% of cobalt; 3.5 to 5.0% of aluminum; 4 to 12% of molybdenum; 0.1 to 7.0% of tungsten; and a total amount of Ti, Ta and Nb being not more than 0.5%. A parameter Ps represented by a formula (1) shown below is 0.6 to 1.6, Ps =−7×[C]−0.1×[Mo]+0.5×[Al] (1) where [C] indicates an amount of carbon; [Mo] indicates an amount of molybdenum; and [Al] indicates an amount of aluminum, by mass percent.
1. A nickel base alloy comprising, by mass
0.001 to 0.1% of carbon
12 to 23% of chromium
18.5 to 25% of cobalt
3.5 to 5.0% of aluminum
4 to 10% of molybdenum
0.1 to 7.0% of tungsten and
not more than 0.5% in a total amount of titanium, tantalum and niobium;
wherein a total amount of molybdenum and tungsten is 4.1 to 12% by mass; and
wherein a parameter Ps represented by a formula (I) shown below is 0.6 to 1.6,
Ps=− 7×[C]−0.1×[Mo]+0.5×[Al] (1)
where [C] indicates an amount of carbon; [Mo] indicates an amount of molybdenum; and [Al] indicates an amount of aluminum, by mass percent.
2. The nickel base alloy according to claim 1 , wherein the nickel base alloy contains 5 to 8% of molybdenum by mass.
3. The nickel base alloy according to claim 1 , wherein the parameter Ps is 0.8 to 1.4.
4. A wrought part for a steam turbine plant, using the nickel base alloy according to claim 1 .
5. The wrought part according to claim 4 , wherein the wrought part is a steam turbine rotor, a boiler tube, a bolt or a nut for a steam turbine plant.
6. The nickel base alloy according to claim 1 , wherein a total amount of molybdenum and tungsten is 5 to 12% by mass.
7. A nickel base alloy comprising, by mass
0.03 to 0.08% of carbon
16 to 20% of chromium
17 to 23% of cobalt
3.6 to 4.5% of aluminum
5 to 8% of molybdenum
2 to 6% of tungsten and
not more than 0.5% in a total amount of titanium, tantalum and niobium;
wherein a total amount of molybdenum and tungsten is not more than 12% by mass; and
wherein a parameter Ps represented by a formula (I) shown below is 0.6 to 1.6,
Ps=− 7×[C]−0.1×[Mo]+0.5×[Al] (1)
where [C] indicates an amount of carbon; [Mo] indicates an amount of molybdenum; and [Al] indicates an amount of aluminum, by mass percent.
8. The nickel base alloy according to claim 7 , wherein the parameter Ps is 0.8 to 1.4.
9. A wrought part for a steam turbine plant, using the nickel base alloy according to claim 7 .
10. The wrought part according to claim 9 , wherein the wrought part is a steam turbine rotor, a boiler tube, a bolt or a nut for a steam turbine plant.