US3660080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Austenitic alloy and weld
Assignee: Armco Inc
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Filing: 1969-01-31
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Granted: 1972-05-02
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Expires: 1989-01-31
Abstract
Abstract Sound, ductile austenitic alloy and weld of high strength in the as-welded condition. The alloy essentially consists of an ironchromium-nickel-manganese austenitic matrix with a second phase comprising a columbium compound, the columbium-rich phase serving to host non-metallic impurities such as phosphides, sulphides, silicides and borides and preclude their depositing in the austenitic grain boundaries. The alloy contains about 12% to 30% chromium, about 10% to 55% nickel, about 5% to 15% manganese, up to 3% molybdenum, carbon about 0.03% to .20%, nitrogen about 0.03% to 0.30%, with 0.5% to 4.5% columbium and/or 1% to 7% tungsten, and remainder iron, this amounting to at least about 22%.
Inventors
- 👤 Ronald H Espy
- 👤 Elbert E Denhard Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:37
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3053; B23K35/3066; C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
Austenitic alloy essentially consisting of about 13% to about 14% chromium, about 18% to about 22% nickel, about 10% to about 11% manganese, about 0.03% to about 0.11% carbon, about 0.06% to about 0.20% nitrogen, about 1.5% to about 3.5% columbium, and about 49% to about 57% iron.
Claim 2
Dependent Claim
45 words
Austenitic alloy essentially consisting of about 15% to about 22% chromium, about 10% to about 22% nickel, about 7% to about 13% manganese, about 0.05% to about 0.12% carbon, about 0.03% to about 0.20% nitrogen, about 1.5% to about 2.5% columbium, and remainder substantially iron.
Claim 3
Dependent Claim
61 words
Austenitic alloy essentially consisting of about 17% to about 21% chromium, about 30% to about 45% nickel, about 5% to about 12% manganese, silicon not exceeding about 0.75%, about 0.05% to about 0.20% carbon, about 0.06% to about 0.20% nitrogen, up to 0.007% boron, about 1.5% to about 3% columbium, and remainder substantially iron, this amounting to at least about 22%.
Claim 4
Dependent Claim
62 words
Austenitic alloy essentially consisting of about 16% to about 21% chromium, about 35% to about 45% nickel, about 9% to about 13% manganese, phosphorus not exceeding about 0.020%, about 0.06% to about 0.12% carbon, about 0.06% to about 0.20% nitrogen, about 1% to about 4% columbium, up to about 3% molybdenum and remainder substantially iron, this amounting to at least about 22%.
Claim 5
Dependent Claim
45 words
Austenitic alloy essentially consisting of about 22% to about 27% chromium, about 18% to about 23% nickel, about 9% to about 13% manganese, about 0.06% to about 0.10% carbon, about 0.06% to about 0.20% nitrogen, about 1% to about 2% columbium, and remainder substantially iron.
Claim 6
Dependent Claim
45 words
Austenitic alloy essentially consisting of about 24% to about 26% chromium, about 20% to about 22% nickel, about 10% to about 12% manganese, about 0.06% to about 0.10% carbon, about 0.06% to about 0.20% nitrogen, about 1% to about 2% columbium, and remainder substantially iron.
Claim 7
Dependent Claim
50 words
Austenitic alloy essentially consisting of about 12% to about 27% chromium, about 17% to about 24% nickel, about 9% to about 12% manganese, about .03% to about 0.12% carbon, about 0.03% to about 0.30% nitrogen, about 1.5% to about 3% columbium, up to about 2% molybdenum, and remainder substantially iron.
Claim 8
Dependent Claim
48 words
Austenitic alloy essentially consisting of about 12% to about 25% chromium, about 12% to about 45% nickel, about 9% to about 13% manganese, about 0.03% to about 0.15% carbon, about 0.03% to about 0.30% nitrogen, about 3% to about 7% tungsten, and about 22% to about 72% iron.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |