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US3700432A
Expired / Lapsed
US
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Ferritic stainless steels with improved stretch-forming characteristics
Assignee: United States Steel Corp
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Filing: 1970-08-11
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Granted: 1972-10-24
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Expires: 1990-08-11
Abstract
Abstract A METHOD FOR IMPROVING THE STRETCH FORMING CHARACTERISTICS OF FERRITIC STAINLESS STEELS. A COMPLES EQUATION SHOWS THE NTERRELATION OF THE VARIOUS ALLOYING ELEMENTS. WITHIN THE COMPOSITIONAL RANGE SIMILAR TO THAT OF TYPE 430 STEEL, THE STRETCHABILITY, AS REPRESENTED BY N VALUE, MAY BE INCREASED BY DECREASING THEC, MN, AND CR AND INCREASING THE SI. FURTHER ENHANCEMENT MAY BE ACHIEVED BY ADDITIONS OF CB, WITH A MAXIUMUM AT 0.6% CB. MO IS SHOWN TO BE DETRIMENTAL TO HIGH N VALUE, AND IF EMPLOYED FOR ITS CORROSION ENHANCEMENT, THE C AND MN MUST BE FURTHER DECREASED.
Inventors
- 👤 Kenneth G Brickner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:51
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/22; C22C38/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |