Nickel alloy having good resistance to corrosion and high tensile strength, and method for producing semi-finished products
A nickel alloy includes (in wt. %) Ni 50-55%, Cr 17-21%, Mo>0-9%, W 0-9%, Nb 1-5.7%, Ta>0-4.7%, Ti 0.1-3.0%, Al 0.4-4.0%, Co max. 3.0%, Mn max. 0.35%, Si max. 0.35%, Cu max. 0.23%, C 0.001-0.045%, S max. 0.01%, P 0.001-0.02%, B 0.001-0.01%, the remainder Fe and the conventional process-related impurities, wherein the following relations are provided: Nb+Ta 1-5.7% (1), Al+Ti>1.2-5% (2), Mo+W 3-9% (3), where Nb, Ta, Al and Ti are the concentration of the elements in question in wt. %.
1. A nickel alloy having (in wt %)
Ni
50-55%
Cr
17-21%
Mo
>0-9%
W
0-9%
Nb
1-5.7%
Ta
>0-4.7%
Ti
0.1-3.0%
Al
0.4-4.0%
Co
max. 3.0%
Mn
max. 0.35%
Si
max. 0.35%
Cu
max. 0.23%
C
0.001-0.045%
S
max. 0.01%
P
0.001-0.02%
B
0.001-0.01%
Fe the rest and the usual process-related impurities, wherein the following relationships are fulfilled
Nb + Ta
1-5.7%
(1)
Al + Ti
>1.2-5%
(2)
Mo + W
3-9%
(3)
wherein Nb, Ta, Al and Ti are the concentrations of the elements in question in wt %.
2. The alloy according to claim 1 , with a chromium content of 17 to 20%.
3. The alloy according to claim 1 , wherein the relationship molybdenum plus tungsten is 3 to 8%.
4. The alloy according to claim 1 , wherein the following relationship is fulfilled between niobium and tantalum:
Nb+Ta=2 to 4.5%,
wherein Nb and Ta are the concentrations of the elements in question in mass %.
5. The alloy according to claim 1 , with a titanium content of 0.5 to 2.0%.
6. The alloy according to claim 1 , with an aluminum content of 0.6 to 2.5%.
7. The alloy according to claim 1 , with a carbon content of 0.001 to max. 0.035%.
8. The alloy according to claim 1 , wherein the following relationship is fulfilled between aluminum and titanium:
Al+Ti=1.4 to 4%,
wherein Al and Ti are the concentrations of the elements in question in mass %.
9. A product made of the alloy according to claim 1 , in the product form of bar, wire, strip, sheet, longitudinally welded pipe, seamless pipe, or powder.
10. A structural part made of the alloy according to claim 1 for use in the oil & gas industry or in the chemical process industry.