Lean austenitic stainless steel
AssigneeATI Properties, Inc.
InventorsDavid S. Bergstrom, James M. Rakowski, Charles P. Stinner, John J. Dunn, John F. Grubb
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Abstract
An austenitic stainless steel having low nickel and molybdenum and exhibiting comparable corrosion resistance and formability properties to higher nickel and molybdenum alloys comprises, in weight %, up to 0.20 C, 2.0-9.0 Mn, up to 2.0 Si, 16.0-23.0 Cr, 1.0-5.0 Ni, up to 3.0 Mo, up to 3.0 Cu, 0.1-0.35 N, up to 4.0 W, up to 0.01 B, up to 1.0 Co, iron and impurities, the steel having a ferrite number of less than 10 and a MD30 value of less than 20° C.
Claims32
An austenitic stainless steel comprising, in weight percentages:
- up to 0.20 C;
- greater than 2.0 to 9.0 Mn;
- up to 1.0 Si;
- 16.0 to 23.0 Cr;
- 1.0 to 3.0 Ni;
- up to 2.0 Mo;
- 0.1 to 0.35 N;
- 0.05 to 4.0 W;
- up to 0.01 B;
- up to 1.0 Co;
- iron;
- and
- impurities;
- the austenitic stainless steel having a ferrite number of at least 3 up to less than 10, and a MD30 value less than 20° C.
An austenitic stainless steel comprising, in weight percentages:
- up to 0.20 C;
- 6.0 to 9.0 Mn;
- up to 1.0 Si;
- 16.0 to 23.0 Cr;
- 1.0 to 3.0 Ni;
- 0.40 to 2.0 Mo;
- 0.1 to 0.30 N;
- 0.05 to 4.0 W;
- up to 0.01 B;
- up to 1.0 Co;
- iron;
- and
- impurities;
- the austenitic stainless steel having a ferrite number at least 3 up to less than 10, a PREW value greater than 22 up to 30, and a MD30 value of less than 20° C.
An article of manufacture including an austenitic stainless steel comprising, in weight percentages:
- up to 0.20 C;
- greater than 2.0 to 9.0 Mn;
- up to 1.0 Si;
- 16.0-23.0 Cr;
- 1.0-3.0 Ni;
- up to 2.0 Mo;
- 0.1-0.35 N;
- 0.05 to 4.0 W;
- up to 0.01 B;
- up to 1.0 Co;
- iron;
- and
- impurities;
- the austenitic stainless steel having a ferrite number of at least 3 up to less than 10, and a MD30 value less than 20° C.
Dependencies are inferred from the claim text.