Wrought stainless steel compositions having engineered microstructures for improved heat resistance
AssigneeUT-Battelle, LLC
InventorsPhilip J. Maziasz, Robert W. Swindeman, Bruce A. Pint, Michael L. Santella, Karren L. More
Life of this patent
Estimating the term…
Abstract
A wrought stainless steel alloy composition includes 12% to 25% Cr, 8% to 25% Ni, 0.05% to 1% Nb, 0.05% to 10% Mn, 0.02% to 0.15% C, 0.02% to 0.5% N, with the balance iron, the composition having the capability of developing an engineered microstructure at a temperature above 550° C. The engineered microstructure includes an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of 1010 to 1017 precipitates per cm3.
Claims47
A wrought stainless steel alloy thin sectioned article composition, comprising:
- 12% to 25% Cr, 8% to 25% Ni 0.05% to 1% Nb, 1.0% to 10% Mn, 0.02% to 0.15% C, 0.10% to 0.5% N, 0.25% to 1% Mo, up to 2% W, 0.24% to 1% Si, with the balance iron, Cr+Ni=41.1%, wherein the percentages are by total weight of the composition, said composition having an engineered microstructure, said engineered microstructure comprising an anstenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of about 1014 to 1017 precipitates per cm3, said article having a article size of 2 μm to 50 μm and a thickness of up to 15 mils.
A wrought stainless steel alloy thin sectioned article composition comprising:
- 15% to 20% Cr, 8% to 13% Ni, 0.05% to 1% Nh, 1% to 5% Mn, 0.02% to 0.1% C, 0.10% to 0.3% N, 0.25% to 0.5% Mo, up to 2% W, 0.24% to 0.5% Si, with the balance iron, wherein the percentages are by total weight of the composition, said composition having an engineered microstructure, said engineered microstructure comprising an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of about to 1014 to 1017 precipitates per cm3 said article having a grain size of 2 μm to 50 μm and a thickness of up to 15 mils.
A wrought stainless steel alloy thin sectioned article composition comprising:
- 15% to 20% Cr, 8% to 13% Ni, 0.05% to 1% Nb, 1% to 5% Mn, 0.02% to 0.1% C, 0.10% to 0.3% N, 0.01% to 4% Cu, 0.25% to 0.5% Mo, up to 2% W, 0.24% to 0.5% Si, with the balance iron, wherein the percentages are by total weight of the composition, said composition having an engineered microstructure, said engineered microstructure comprising an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of about 1014 to 1017 precipitates per cm3, said article having a grain size of 2 μm to 50 μm and a thickness of up to 15 mils.
A wrought stainless steel alloy thin sectioned article composition comprising:
- 19% to 25% Cr, 19% to 25% Ni, 0.05% to 0.7% Nb, 1.0% to 10% Mn, 0.02% to 0.1% C, 0.10% to 0.5% N, 0.01 to 5% Al, 0.25% to 0.5% Mo, up to 2% W, 0.24% to 0.5% Si, with the balance iron, wherein the percentages are by total weight of the composition, said composition having an engineered microstructure, said engineered microstructure comprising an austenite matrix having therein a dispersion of intragranular NbC precipitates in a concentration in the range of 1014 to 1017 precipitates per cm3, said composition further comprising alumina scale, said article having a grain size of 2 μm to 50 μm and a thickness of up to 15 mils.
Dependencies are inferred from the claim text.