STAINLESS STEEL ALLOYS, TURBOCHARGER COMPONENTS FORMED FROM THE STAINLESS STEEL ALLOYS, AND METHODS FOR MANUFACTURING THE SAME
An austenitic stainless steel alloy includes, by weight, about 23.0% to about 25.0% chromium, about 8.5% to about 10.0% nickel, about 4.0% to about 5.0% manganese, about 0.8 to about 0.9% niobium, about 0.5% to about 1.5% silicon, about 0.35% to about 0.45% carbon, about 0.2% to about 0.3% nitrogen, and a balance of iron with inevitable/unavoidable impurities. The elements tungsten and molybdenum are excluded beyond impurity levels. In one example, a turbocharger turbine housing is made of the stainless steel alloy.
1 . An austenitic stainless steel alloy, comprising, by weight:
23.0% to 25.0% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.8% to 0.9% niobium;
0.8% to 1.2% silicon;
0.35% to 0.45% carbon;
0.22% to 0.28% nitrogen; and
a balance of iron with inevitable/unavoidable impurities,
wherein molybdenum, and tungsten are excluded from the alloy beyond impurity levels, wherein the austenitic stainless steel alloy has a nitrogen solubility at a temperature of 1700° C. that is defined by N=0.01*(−2.57+1.571*Cr−0.388*Ni+0.593*Mn−2.918*Si) and that is greater than 0.28% by weigh to prevent nitrogen porosity formation during the casting process, wherein N indicates % nitrogen by weight, Cr indicates % chromium by weight, Ni indicates % nickel by weight, Mn indicates % manganese by weight, and Si indicates % silicon by weight.
2 . The austenitic stainless steel alloy of claim 1 , comprising 23.5% to 24.5% chromium.
3 . The austenitic stainless steel alloy of claim 1 , comprising 8.8% to 9.7% nickel.
4 . The austenitic stainless steel alloy of claim 1 , comprising 4.1% to 4.9% manganese.
5 . (canceled)
6 . The austenitic stainless steel alloy of claim 1 , comprising 0.37% to 0.43% carbon.
7 . (canceled)
8 . The austenitic stainless steel alloy of claim 1 , consisting of, by weight:
23.0% to 25.0% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.8% to 0.9% niobium;
0.8% to 1.2% silicon;
0.35% to 0.45% carbon;
0.22% to 0.28% nitrogen; and
a balance of iron with inevitable/unavoidable impurities.
9 . A turbocharger turbine component comprising:
an austenitic stainless steel alloy, wherein the austenitic stainless steel alloy comprises, by weight:
23.0% to 25.0% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.8% to 0.9% niobium;
0.8% to 1.2% silicon;
0.35% to 0.45% carbon;
0.22% to 0.28% nitrogen; and
a balance of iron with inevitable/unavoidable impurities,
wherein molybdenum, and tungsten are excluded from the alloy beyond impurity levels, wherein the austenitic stainless steel alloy has a nitrogen solubility at a temperature of 1700° C. that is defined by N=0.01*(−2.57+1.571*Cr−0.388*Ni+0.593*Mn−2.918*Si) and that is greater than 0.28% by weigh to prevent nitrogen porosity formation during the casting process, wherein N indicates % nitrogen by weight, Cr indicates % chromium by weight, Ni indicates % nickel by weight, Mn indicates % manganese by weight, and Si indicates % silicon by weight.
10 . The turbocharger turbine component of claim 9 , wherein the austenitic stainless steel comprises 23.5% to 24.5% chromium.
11 . The turbocharger turbine component of claim 9 , wherein the austenitic stainless steel alloy comprises 8.8% to 9.7% nickel.
12 . The turbocharger turbine component of claim 9 , wherein the austenitic stainless steel alloy comprises 4.1% to 4.9% manganese.
13 . (canceled)
14 . The turbocharger turbine component of claim 9 , wherein the austenitic stainless steel alloy comprises 0.37% to 0.43% carbon.
15 . (canceled)
16 . The turbocharger turbine component of claim 9 , wherein the austenitic stainless steel alloy consists of, by weight:
23.0% to 25.0% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.8% to 0.9% niobium;
0.8% to 1.2% silicon;
0.35% to 0.45% carbon;
0.22% to 0.28% nitrogen; and
a balance of iron with inevitable/unavoidable impurities.
17 . The turbocharger turbine component of claim 9 , wherein the turbocharger turbine component comprises a turbocharger turbine housing.
18 . A vehicle comprising the turbocharger turbine component of claim 9 .
19 . A method of making a turbocharger turbine component comprising forming the turbocharger turbine component using an austenitic stainless steel alloy, wherein the austenitic stainless steel alloy comprises, by weight:
23.0% to 25.0% chromium;
8.5% to 10.0% nickel;
4.0% to 5.0% manganese;
0.8% to 0.9% niobium;
0.8% to 1.2% silicon;
0.35% to 0.45% carbon;
0.22% to 0.28% nitrogen; and
a balance of iron with inevitable/unavoidable impurities,
wherein molybdenum, and tungsten are excluded from the alloy beyond impurity levels, wherein the austenitic stainless steel alloy has a nitrogen solubility at a temperature of 1700° C. that is defined by N=0.01*(−2.57+1.571*Cr−0.388*Ni+0.593*Mn−2.918*Si) and that is greater than 0.28% by weigh to prevent nitrogen porosity formation during the casting process, wherein N indicates % nitrogen by weight, Cr indicates % chromium by weight, Ni indicates % nickel by weight, Mn indicates % manganese by weight, and Si indicates % silicon by weight.