US3778255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant low carbon chromium alloy steel
Assignee: RES INST METALS OF TOHOKU UNIV
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Filing: 1972-07-25
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Granted: 1973-12-11
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Expires: 1992-07-25
Abstract
Abstract A chromium-containing steel having excellent corrosion resistance whose content of calcium is 0.0005 - 0.02 weight percent, content of carbon is not more than 0.02 weight percent and content of chromium is 25 - 38 weight percent. Such a steel can be produced by adding calcium or an alloy thereof to a melt of ferrochromium containing chromium within the foregoing range and thereafter carrying out the refining operations of decarbonization, deoxidation and desulfurization.
Inventors
- 👤 T Ototani
- 👤 S Shimodaira
- 👤 Y Kataura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:18
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
20 words
The chromium alloy steel according to claim 1 wherein the content of Ca is 0.001 - 0.005 percent by weight.
Claim 2
Dependent Claim
20 words
The chromium alloy steel according to claim 1 wherein the content of Cr is 27 - 35 percent by weight.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |