Claims
- 1. A duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to less than 19 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to 3.75 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; up to 0.03 percent boron; iron and incidental impurities.
- 2. The duplex stainless steel of claim 1 comprising up to 0.03 percent carbon.
- 3. The duplex stainless steel of claim 1 comprising 17 to less than 19 percent chromium.
- 4. The duplex stainless steel of claim 1 comprising 1 to 1.75 percent nickel.
- 5. The duplex stainless steel of claim 1 comprising 2.5 to 3.0 percent manganese.
- 6. The duplex stainless steel of claim 1 comprising greater than 0.12 up to 0.20 percent nitrogen.
- 7. The duplex stainless steel of claim 1 comprising up to 1 percent silicon.
- 8. The duplex stainless steel of claim 1 comprising 1 to 1.5 percent molybdenum.
- 9. The duplex stainless steel of claim 1 comprising 0.001 to 0.0035 percent boron.
- 10. A duplex stainless steel comprising, in weight percent: up to 0.03 percent carbon; 17 to less than 19 percent chromium; 1 to 1.75 percent nickel; 2.5 percent up to 3.0 percent manganese; greater than 0.12 up to 0.20 percent nitrogen; up to 1 percent silicon; 1 up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; up to 0.03 percent boron; iron and incidental impurities.
- 11. An article of manufacture including a duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to less than 19 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to 3.75 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; up to 0.03 percent boron; iron and incidental impurities.
- 12. The article of claim 11 wherein the article is selected from the group consisting of strip, bar, plate, sheet, casting, tubing and piping.
- 13. A method for making a duplex stainless steel, the process comprising:providing a duplex stainless steel comprising, in weight percent, up to 0.06 percent carbon, 15 to less than 19 percent chromium, 1 to less than 2 percent nickel, greater than 2 percent up to 3.75 percent manganese, greater than 0.12 up to 0.35 percent nitrogen, up to 2 percent silicon, up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, up to 0.03 percent boron, iron and incidental impurities; solution annealing the steel; and cooling the steel.
- 14. A duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to 25 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities.
- 15. The duplex stainless steel of claim 14 comprising up to 0.03 percent carbon.
- 16. The duplex stainless steel of claim 14 comprising 17 to 20 percent chromium.
- 17. The duplex stainless steel of claim 14 comprising 1 to 1.75 percent nickel.
- 18. The duplex stainless steel of claim 14 comprising 2.5 up to less than 3.0 percent manganese.
- 19. The duplex stainless steel of claim 14 comprising greater than 0.12 up to 0.20 percent nitrogen.
- 20. The duplex stainless steel of claim 14 comprising up to 1 percent silicon.
- 21. The duplex stainless steel of claim 14 comprising 1 to 1.5 percent molybdenum.
- 22. A duplex stainless steel comprising, in weight percent: up to 0.03 percent carbon; 17 to 20 percent chromium; 1 to less-then 1.75 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.20 percent nitrogen; up to 1 percent silicon; 1 to 1.5 percent molybdenum; less than 0.5 percent copper; less than 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 up to 0.0035 percent boron; iron and incidental impurities.
- 23. An article of manufacture including a duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to 25 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron, iron and incidental impurities.
- 24. The article of claim 23 wherein said article is selected from the group consisting of strip, bar, plate, sheet, casting, tubing and piping.
- 25. A method for making a duplex stainless steel, the method comprising:providing a duplex stainless steel comprising, in weight percent, up to 0.06 percent carbon, 15 to 25 percent chromium, 1 to less than 2 percent nickel, greater than 2 percent up to less than 3 percent manganese, greater than 0.12 up to 0.35 percent nitrogen, up to 2 percent silicon, up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, 0.001 to 0.0035 percent boron, iron and incidental impurities; solution annealing the steel; and cooling the steel.
- 26. A duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to less than 21.5 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities.
- 27. The duplex stainless steel of claim 26 comprising up to 0.03 percent carbon.
- 28. The duplex stainless steel of claim 26 comprising 17 to 20 percent chromium.
- 29. The duplex stainless steel of claim 26 comprising 1 to 1.75 percent nickel.
- 30. The duplex stainless steel of claim 26 comprising 2.5 to less than 3.0 percent manganese.
- 31. The duplex stainless steel of claim 26 comprising greater than 0.12 up to 0.20 percent nitrogen.
- 32. The duplex stainless steel of claim 26 comprising up to 1 percent silicon.
- 33. The duplex stainless steel of claim 26 comprising 1 to 1.5 percent molybdenum.
- 34. A duplex stainless steel comprising, in weight percent: up to 0.03 percent carbon; 17 to 20 percent chromium; 1 to 1.75 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.20 percent nitrogen; up to 1 percent silicon; 1 to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 up to 0.0035 percent boron; iron and incidental impurities.
- 35. An article of manufacture including a duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 to 21.5 percent chromium; 1 to less than 2 percent nickel; greater than 2 percent up to less than 3 percent manganese; greater than 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities.
- 36. The article of claim 35 wherein said article is selected from the group consisting of strip, bar, plate, sheet, casting, tubing and piping.
- 37. A method for making a duplex stainless steel, the method comprising:providing a duplex stainless steel comprising, in weight percent, up to 0.06 percent carbon, 15 to 21.5 percent chromium, 1 to less than 2 percent nickel, greater than 2 percent up to less than 3 percent manganese, greater than 0.12 up to 0.35 percent nitrogen, up to 2 percent silicon, up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, 0.001 to 0.0035 percent boron, iron and incidental impurities; solution annealing the steel; and cooling the steel.
- 38. A duplex stainless steel comprising, in weight percent: up to 0.03 percent carbon; 19 percent up to 21.5 percent chromium; 1 percent up to less than 2 percent nickel; greater than 2.0 percent up to less than 3 percent manganese; 0.12 percent up to 0.3 percent nitrogen; up to 1 percent silicon; 0.75 percent up to 1.5 percent molybdenum; up to 0.4 percent copper; up to 0.2 percent cobalt; up to 0.03 percent phosphorus; up to 0.02 percent sulfur; 0.001 percent up to 0.0035 percent boron; iron and incidental impurities.
- 39. An article of manufacture including a duplex stainless steel comprising, in weight percent: up to 0.03 percent carbon; 19 percent up to 21.5 percent chromium; 1 percent up to less than 2 percent nickel; greater than 2.0 percent up to less than 3 percent manganese; 0.12 percent up to 0.3 percent nitrogen; up to 1 percent silicon; 0.75 percent up to 1.5 percent molybdenum; up to 0.4 percent copper; up to 0.2 percent cobalt; up to 0.03 percent phosphorus; up to 0.02 percent sulfur; 0.001 percent up to 0.0035 percent boron; iron and incidental impurities.
- 40. The article of manufacture of claim 39 wherein said article is selected from the group consisting of strip, bar, plate, sheet, casting, tubing and piping.
- 41. A method for making a duplex stainless steel, the method comprising:providing a duplex stainless steel comprising, in weight percent, up to 0.03 percent carbon, 19 percent up to 21.5 percent chromium, 1 percent up to less than 2 percent nickel, greater than 2 percent up to less than 3 percent manganese, 0.12 percent up to 0.3 percent nitrogen, up to 1 percent silicon, 0.75 percent up to 1.5 percent molybdenum, up to 0.4 percent copper, up to 0.2 percent cobalt, up to 0.03 percent phosphorus, up to 0.02 percent sulfur, 0.001 percent up to 0.0035 percent boron, iron and incidental impurities, solution annealing the steel; and cooling the steel.
- 42. A duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 up to 25 percent chromium; 1 percent up to less than 2 percent nickel; greater than 2 percent up to 3.75 percent manganese; 0.12 up to 0.35 percent nitrogen; up to 2 percent silicon; greater than 1 percent up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities.
- 43. An article of manufacture including a duplex stainless steel comprising, in weight percent: up to 0.06 percent carbon; 15 percent up to 25 percent chromium; 1 percent up to less than 2 percent nickel; greater than 2 percent up to 3.75 percent manganese; 0.12 percent up to 0.35 percent nitrogen; up to 2 percent silicon; greater than 1 percent up to 1.5 percent molybdenum; up to 0.5 percent copper; up to 0.2 percent cobalt; up to 0.05 percent phosphorous; up to 0.005 percent sulfur; 0.001 to 0.0035 percent boron; iron and incidental impurities.
- 44. The article of manufacture of claim 43 wherein said article is selected from the group consisting of strip, bar, plate, sheet, casting, tubing and piping.
- 45. A method for making a duplex stainless steel, the method comprising:providing a duplex stainless steel comprising, in weight percent, up to 0.06 percent carbon, 15 percent up to 25 percent chromium, 1 percent up to less than 2 percent nickel, greater than 2 percent up to 3.75 percent manganese, 0.12 percent up to 0.35 percent nitrogen, up to 2 percent silicon, greater than 1 percent up to 1.5 percent molybdenum, up to 0.5 percent copper, up to 0.2 percent cobalt, up to 0.05 percent phosphorous, up to 0.005 percent sulfur, 0.001 to 0.0035 percent boron, iron and incidental impurities; solution annealing the steel; and cooling the steel.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 10/012,908 filing date Oct. 30, 2001, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0 659 896 |
Apr 1997 |
EP |
1 061 151 |
Dec 2000 |
EP |
10-102206 |
Apr 1998 |
JP |
0227056 |
Apr 2002 |
WO |
Non-Patent Literature Citations (1)
Entry |
J&L Specialty Steel, Inc., Type 2205 (UNS A31803) Duplex Stainless Steel, No Publication Date. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10/012908 |
Oct 2001 |
US |
Child |
10/238182 |
|
US |