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US3740213A
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Stainless ferrite-austenitic steel
Assignee: Saab Bofors AB
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Filing: 1969-05-12
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Granted: 1973-06-19
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Expires: 1989-05-12
Abstract
Abstract A stainless ferrite-austenitic steel of the following composition: Percent C0.02-0.08 Si maximum of 0.5 Mn maximum of 1.0 N maximum of 0.06 Cr24-27 Ni5-7 Mo1.3-1.8 AND COLUMBIUM IN SUCH A CONTENT THAT THE RATIO Cbrest/C is at least eight, Cbrest referring to the total columbium content minus the content of columbium required for binding of the nitrogen present in steel to columbium nitride, and C referring to the total carbon content, the remainder being essentially iron, has a high resistance to intercrystalline corrosion.
Inventors
- 👤 L Hellner
- 👤 N Hede
- 👤 H Johansson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:59
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; A; A61; A61F; A61F13/00; A61F13/06; C22C38/48
Claims Analysis
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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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |