Turbocharger turbine housings formed from the stainless steel alloys, and methods for manufacturing the same
View Patent ↗Disclosed is an austenitic stainless steel alloy that includes, by weight, about 22% to about 28% chromium, about 3.5% to about 6.5% nickel, about 1% to about 6% manganese, about 0.5% to about 2.5% silicon, about 0.3% to about 0.6% carbon, about 0.2% to about 0.8% niobium, about 0.2% to about 0.8% nitrogen, and a balance of iron. Molybdenum and tungsten are excluded. The alloy is suitable for use in turbocharger turbine housing applications for temperature up to about 980° C.
1. An turbocharger turbine housing comprising:
an austenitic stainless steel alloy, wherein the austenitic stainless steel alloy comprises, by weight:
22% to 28% chromium;
3.5% to 6.5% nickel;
1% to 6% manganese;
1.0% to 2.0% silicon;
0.3% to 0.6% carbon;
0.2% to 0.8% niobium;
0.2% to 0.8% nitrogen; and
a balance of iron, with the proviso that molybdenum and tungsten are excluded from the alloy.
2. The turbocharger turbine housing of claim 1 comprising 23% to 27% chromium.
3. The turbocharger turbine housing of claim 1 comprising 4.0% to 6.0% nickel.
4. The turbocharger turbine housing of claim 1 comprising 1.5% to 5.5% manganese.
5. The turbocharger turbine housing of claim 1 comprising 0.4% to 0.5% carbon.
6. The turbocharger turbine housing of claim 1 comprising 0.4% to 0.6% niobium.
7. The turbocharger turbine housing of claim 1 comprising 0.4% to 0.6% nitrogen.
8. A turbocharger comprising the turbocharger turbine housing of claim 1 that operates at a temperature of up to 980° C.
9. A method of fabricating a turbocharger turbine housing, the method comprising the step of:
forming the turbocharger turbine housing from an austenitic stainless steel alloy, wherein the austenitic stainless steel alloy comprises, by weight:
22% to 28% chromium;
3.5% to 6.5% nickel;
1% to 6% manganese;
1.0% to 2.0% silicon;
0.3% to 0.6% carbon;
0.2% to 0.8% niobium;
0.2% to 0.8% nitrogen; and
a balance of iron, with the proviso that molybdenum and tungsten are excluded from the alloy.
10. The method of claim 9 , further comprising forming a turbocharger turbine using the turbocharger turbine housing.
11. The method of claim 9 , wherein the austenitic stainless steel alloy comprises 23% to 27% chromium.
12. The method of claim 9 , wherein the austenitic stainless steel alloy comprises 24% to 26% chromium.
13. The turbocharger turbine housing of claim 1 comprising 24% to 26% chromium.