Stainless steel alloys, turbocharger turbine housings formed from the stainless steel alloys, and methods for manufacturing the same
View Patent ↗Disclosed is an ferritic stainless steel alloy that includes, by weight, about 20% to about 22% chromium, about 0% to about 0.5% nickel, about 0.5% to about 1.0% manganese, about 1.0% to about 2.5% silicon, about 1.5% to about 2.2% tungsten, about 1.3% to about 1.8% niobium, about 0.35% to about 0.45% carbon, and a balance of iron. The alloy is suitable for use in turbocharger turbine housing applications for temperature up to about 1050° C.
1. A ferritic stainless steel alloy, consisting of, by weight:
20% to 22% chromium;
0.5% to 1.0% manganese;
1.0% to 2.5% silicon;
1.5% to 2.2% tungsten;
1.3% to 1.8% niobium;
0.35% to 0.45% carbon;
phosphorus at no more than 0.04%;
sulfur at not more than 0.03%; and
a balance of iron and unavoidable/inevitable impurities.
2. The ferritic stainless steel alloy of claim 1 consisting of 20% to 21% chromium.
3. The ferritic stainless steel alloy of claim 1 consisting of 0.6% to 0.9% manganese.
4. The ferritic stainless steel alloy of claim 1 consisting of 1.5% to 2.0% silicon.
5. The ferritic stainless steel alloy of claim 1 consisting of 1.7% to 2.0% tungsten.
6. The ferritic stainless steel alloy of claim 1 consisting of 1.5% to 1.7% niobium.
7. The ferritic stainless steel alloy of claim 1 consisting of 0.38% to 0.42% carbon.
8. A turbocharger turbine housing comprising:
a ferritic stainless steel alloy, wherein the ferritic stainless steel alloy consists of, by weight:
20% to 22% chromium;
0.5% to 1.0% manganese;
1.0% to 2.5% silicon;
1.5% to 2.2% tungsten;
1.3% to 1.8% niobium;
0.35% to 0.45% carbon;
phosphorus at no more than 0.04%;
sulfur at not more than 0.03%; and
a balance of iron and unavoidable/inevitable impurities.
9. The turbocharger turbine housing of claim 8 consisting of 20% to 21% chromium.
10. The turbocharger turbine housing of claim 8 consisting of 0.6% to 0.9% manganese.
11. The turbocharger turbine housing of claim 8 consisting of 1.5% to 2.0% silicon.
12. The turbocharger turbine housing of claim 8 consisting of 1.7% to 2.0% tungsten.
13. The turbocharger turbine housing of claim 8 consisting of 1.5% to 1.7% niobium.
14. The turbocharger turbine housing of claim 8 consisting of 0.38% to 0.42% carbon.
15. The turbocharger comprising the turbocharger turbine housing of claim 8 that operates at a temperature of up to 1050° C.
16. A method of fabricating a turbocharger turbine housing, the method comprising the step of:
forming the turbocharger turbine housing from a ferritic stainless steel alloy, wherein the ferritic stainless steel alloy consists of, by weight:
20% to 22% chromium;
0.5% to 1.0% manganese;
1.0% to 2.5% silicon;
1.5% to 2.2% tungsten;
1.3% to 1.8% niobium;
0.35% to 0.45% carbon;
phosphorus at no more than 0.04%;
sulfur at not more than 0.03%; and
a balance of iron and unavoidable/inevitable impurities.