Patent US3772005A successfully refreshed from Google Patents.
US3772005A
Expired / Lapsed
US
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Corrosion resistant ultra high strength stainless steel
Assignee: Huntington Alloys Corp
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Filing: 1970-10-13
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Granted: 1973-11-13
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Expires: 1990-10-13
Abstract
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.
Inventors
- 👤 J Debarbadillo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:30
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
18 words
A stainless steel in accordance with claim 1 containing at least 1 percent nickel and 15 percent cobalt.
Claim 2
Dependent Claim
23 words
A stainless steel in accordance with claim 2 in which the sum of the chromium plus twice the molybdenum is at least 30.
Claim 3
Dependent Claim
26 words
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.
Claim 4
Dependent Claim
29 words
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.
Claim 5
Dependent Claim
16 words
A stainless steel according to claim 5 in which the area is DEHG of FIG. 1.
Claim 6
Dependent Claim
30 words
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.
Claim 7
Dependent Claim
51 words
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.
Claim 8
Dependent Claim
79 words
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.
Claim 9
Dependent Claim
63 words
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.
Claim 10
Dependent Claim
17 words
A stainless steel wire produced from a steel having a composition as set forth in claim 1.
Claim 11
Dependent Claim
17 words
A stainless steel wire produced from a steel having a composition as set forth in claim 3.
Claim 12
Dependent Claim
17 words
A stainless steel wire produced from a steel having a composition as set forth in claim 10.
Claim 13
Dependent Claim
17 words
A stainless steel wire produced from a steel having a composition as set forth in claim 9.
Claim 14
Dependent Claim
17 words
A work hardened article produced from a stainless steel having a composition in accordance with claim 1.
Claim 15
Dependent Claim
17 words
A work hardened article produced from a stainless steel having a composition in accordance with claim 3.
Claim 16
Dependent Claim
17 words
A work hardened article produced from a stainless steel having a composition in accordance with claim 10.
Claim 17
Dependent Claim
17 words
A work hardened article produced from a stainless steel having a composition in accordance with claim 9.
Claim 18
Dependent Claim
161 words
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.
Claim 19
Dependent Claim
35 words
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.
Claim 20
Dependent Claim
31 words
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.
Claim 21
Dependent Claim
14 words
A stainless steel in accordance with claim 19 containing at least 15 percent cobalt.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |