Semi-austenitic cr-ni-al-cu stainless steel
Abstract
Abstract A SEMI-AUSTENITIC CHROMIUM-NICKEL-ALUMINUM STAINLESS STEEL CONSISTING ESSENTIALLY OF, BY WEIGHT PERCENT, ABOUT 7.0-18.0% CHROMIUM, ABOUT 6.0-12.0% NICKEL, ABOUT .5-2.5% ALUMINUM, MANGANESE AND SILICON EACH NOT EXCEEDING ABOUT 1.0%, CARBON NOT EXCEEDING ABOUT .042%, PHOSPHORUS NOT EXCEEDING ABOUT .040%, SULFUR NOT EXCEEDING ABOUT 0.15%, NITROGEN NOT EXCEEDING ABOUT .05%, MOLYBDENUM UP TO ABOUT 8.0% ABOUT 1.0-3.0% COPPER, ABOUT .0005-003% BORON, AND THE BALANCE ESSENTIALLY IRON. SAID STEEL, IN THE PRECIPITATION HARDENABLE CONDITIONS, IS CHARACTERIZED BY A U.T.S. OF AT LEAST 230 K.S.I. AND IMPROVED TOUGHNESS AT ROOM TEMPERTURE AS MEASURED BY A PRECRACKED SHEET CHARPY WITH A VALUE OF 1000 IN.-LBS./IN.2, PROVIDED THAT THE CARBON CONTENT PLUS 6X BORON CONTENT DOES NOT EXCEED .045
Inventors
- 👤 P Allen
Bibliographic Details
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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) | 1977-03-04 | 1977-09-03 | 1978-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-04 | 1981-09-03 | 1982-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-04 | 1985-09-03 | 1986-03-05 | $7700.00 | Window Closed / Lapsed |