Stainless steel alloys, 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% nitrogen, and a balance of iron. Molybdenum, niobium, 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 consists of, by weight:
24% to 26% chromium;
3.5% to 6.5% nickel;
1% to 6% manganese;
0.5% to 2.5% silicon;
0.3% to 0.6% carbon;
0.2% to 0.5% nitrogen;
up to 0.03% phosphorous;
up to 0.03% sulfur; and
a balance of iron and inevitable/unavoidable impurities.
2. The turbocharger turbine housing of claim 1 consisting of by weight 4.0% to 6.0% nickel.
3. The turbocharger turbine housing of claim 2 consisting of by weight 4.5% to 5.5% nickel.
4. The turbocharger turbine housing of claim 3 consisting of by weight 2.0% to 5.0% manganese.
5. The turbocharger turbine housing of claim 4 consisting of by weight 0.2% to 0.3% nitrogen.
6. The turbocharger turbine housing of claim 1 consisting of by weight 1.5% to 5.5% manganese.
7. The turbocharger turbine housing of claim 6 consisting of by weight 2.0% to 5.0% manganese.
8. The turbocharger turbine housing of claim 7 consisting of by weight 0.2% to 0.3% nitrogen.
9. The turbocharger turbine housing of claim 1 consisting of by weight 1.0% to 2.0% silicon.
10. The turbocharger turbine housing of claim 1 consisting of by weight 0.4% to 0.5% carbon.
11. The turbocharger turbine housing of claim 1 consisting of by weight 0.3% to 0.5% nitrogen.
12. A turbocharger comprising the turbocharger turbine housing of claim 1 that operates at a temperature of up to 980° C.
13. The turbocharger turbine housing of claim 1 consisting of by weight 0.2% to 0.3% nitrogen.
14. 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 consists of, by weight:
24% to 26% chromium;
3.5% to 6.5% nickel;
1% to 6% manganese;
0.5% to 2.5% silicon;
0.3% to 0.6% carbon;
0.2% to 0.5% nitrogen;
up to 0.03% phosphorous;
up to 0.03% sulfur; and
a balance of iron and inevitable/unavoidable impurities.
15. The method of claim 14 , further comprising forming a turbocharger turbine using the turbocharger turbine housing.