Stainless steel
Abstract
Abstract PRECIPITATION - HARDENABLE CHROMIUM-NICKEL-ALUMINUMMOLYBDENUM STAINLESS STEEL WITH CRITICALLY LIMITED AMOUNTS OF CARBON, SULPHUR AND NITROGEN, OF SUCH COMPOSITION BALANCE AS TO BE MARTENSITIC IN THE SOLUTION-TREATED CONDITION AND PRECIPITATION-HARDENABLE THEREFOROM BOTH BY SINGLE HEAT-TREATMENT AND BY DOUBLE HEAT-TREATMENT, I.E., A SINGLE HEATING AT PRECIPITATION-HARDENING TEMPERATURE (900*F. TO 1150*F) OR A FIRST HEATING AND QUENCHING FROM SUBSTANTIAL TEMPERATURE (1300*F TO 1750*), FOLLOWED BY HEATING AT PRECIPITATION-HARDENING TEMPERATURE AS IN HEATTREATING A FABRICATED COMPOSITE STRUCTURE AS REQUIRED BY THE OTHER METALS IN THE STRUCTURE. MORE ESPECIALLY, THE STEEL ESSENTIALLY CONSISTS OF ABOUT 11.5% TO 13.5% CHROMIUM, ABOUT 7.0% TO 10.0% NICKEL, ABOUT 0.5% TO 1.5% ALUMINUM, ABOUT 1.75% TO 2.50% MOLYBDENUM, CARBON NOT OVER 0.05%, MANGANESE NOT OVER 0.50%, SILICON NOT OVER 0.60%, SULPHUR LESS THAN 0.015%, NITROGEN NOT OVER 0.05%, AND REMAINDER ESSENTIALLY IRON.
Inventors
- 👤 William C Clarke Jr
- 👤 D Cameron Perry
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |