Corrosion resistant ultra high strength stainless steel

{
  "publication_number": "US3772005A",
  "country": "US",
  "kind": "A",
  "title": "Corrosion resistant ultra high strength stainless steel",
  "abstract": "Corrosion resistant stainless steels capable of developing very high tensile strengths, e.g., upwards of 350,000 psi, in the work hardened condition, the steels containing correlated amounts of chromium, molybdenum, nickel, cobalt, carbon, nitrogen, manganese and silicon. The steels are specifically directed to minimizing corrosive attack in low velocity seawater.",
  "claims": [
    "2. A stainless steel in accordance with claim 1 containing at least 1 percent nickel and 15 percent cobalt.",
    "3. A stainless steel in accordance with claim 2 in which the sum of the chromium plus twice the molybdenum is at least 30.",
    "4. A stainless steel in accordance with claim 2 containing from 0.01 to 0.08 percent carbon, the sum of the carbon plus nitrogen not exceeding 0.2 percent.",
    "5. A stainless steel according to claim 2 in which the Ferrite Index and Austenite Index values are correlated to represent a point within the area DEFD of FIG. 1.",
    "6. A stainless steel according to claim 5 in which the area is DEHG of FIG. 1.",
    "7. A stainless steel according to claim 2 in which the Ferrite Index and Austenite Stability Index values are correlated to represent a point within the area PQRS of FIG. 2.",
    "8. A stainless steel in accordance with claim 2 in which the Ferrite Index is correlated with the Austenite Index so as to represent a point within the area DEFD of FIG. 1 and with the Austenite Stability Index so as to represent a point within the area PQRS of FIG. 2.",
    "9. A stainless steel in accordance with claim 2 containing about 16 to 22 percent chromium, about 4 to 8.5 percent molybdenum, the chromium plus twice the molybdenum being at least about 30, about 2.5 to 6.5 percent nickel, about 15 to 25 percent cobalt, about 0.01 to 0.15 percent carbon, up to 0.01 percent nitrogen, the sum of the carbon plus nitrogen not exceeding 0.2 percent, up to about 0.75 percent silicon and up to about 2 percent manganese.",
    "10. A stainless steel in accordance with claim 2 containing 17 to 20 percent chromium, 5.5 to 7.5 percent molybdenum, the sum of the chromium plus twice the molybdenum being at least 30.5, 3 to 5 percent nickel, 17 to 23 percent cobalt, 0.01 to 0.08 percent carbon, up to 0.04 percent nitrogen, up to 0.75 percent silicon and up to 2 percent manganese.",
    "11. A stainless steel wire produced from a steel having a composition as set forth in claim 1.",
    "12. A stainless steel wire produced from a steel having a composition as set forth in claim 3.",
    "13. A stainless steel wire produced from a steel having a composition as set forth in claim 10.",
    "14. A stainless steel wire produced from a steel having a composition as set forth in claim 9.",
    "15. A work hardened article produced from a stainless steel having a composition in accordance with claim 1.",
    "16. A work hardened article produced from a stainless steel having a composition in accordance with claim 3.",
    "17. A work hardened article produced from a stainless steel having a composition in accordance with claim 10.",
    "18. A work hardened article produced from a stainless steel having a composition in accordance with claim 9.",
    "19. A stainless steel consisting essentially of from 14 to 27.65 percent chromium, about 3 to 12 percent molybdenum, being up to 17.5 percent nickel, cobalt present in an amount up to about 25.5 percent, the sum of the chromium plus twice the molybdenum being greater than 28.5, carbon up to 0.3 percent, up to 0.3 percent nitrogen, the sum of the carbon plus nitrogen not exceeding 0.3 percent, up to 2 percent silicon, up to 5 percent manganese, up to 2 percent columbium, up to 4 percent tantalum, the sum of the percentage of columbium plus one-half the percentage of tantalum being up to 2 percent, up to 5 percent copper, and the balance essentially iron, the Ferrite Index being correlated with the Austenite Index so as to represent a point within the area ABCA of FIG. 1 and with the Austenite Stability Index so as to represent a point within the area JKLMJ of FIG. 2 of the accompanying drawing.",
    "20. A stainless steel in accordance with claim 19 containing at least 2 percent nickel, at least 15 percent cobalt, and in which the sum of the chromium plus twice the molybdenum is at least 30.",
    "21. A stainless steel in accordance with claim 19 which contains at least 15 percent cobalt and a small but effective amount of columbium up to 2 percent to improve corrosion resistance.",
    "22. A stainless steel in accordance with claim 19 containing at least 15 percent cobalt."
  ],
  "cpc": [
    "C22C 38/44"
  ],
  "assignees": [
    "INT NICKEL CO"
  ],
  "filing_date": "1970-10-13",
  "publication_date": "1973-11-13",
  "grant_date": "1973-11-13",
  "priority_date": "1970-10-13",
  "application_number": "US-3772005D-A",
  "family_id": "22156774",
  "citations": [
    "US2083524A",
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    "US2398702A",
    "US2801916A",
    "US3152934A",
    "US3563729A",
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  ]
}