Composite chill cast iron rolling mill rolls having increased resistance to the spalling
Abstract
Abstract A COMPOSITE CHILL CAST IRON ROLL IN WHICH THE CHILL AREA HAS A COMPOSITION OF ABOUT 3.20% TO ABOUT 3.40% CAR1.45% TO ABOUT 1.65% SILICON, ABOUT 4.00% TO ABOUT 4.40% NICKEL, ABOUT 0.90% TO ABOUT 1.10% CHROMIUM, ABOUT 0.50% TO ABOUT 0.70% MOLYBDENUM AND ABOUT 0.03% TO ABOUT 0.08% MAGNESIUM, ABOUT 0.07% PHOSPHORUS, ABOUT 0.02% SULFUR, THE REMAINDER IRON AND INCIDENTAL IMPURITIES AND THE CORE IS A LOW ALLOY CAST IRON COMPOSITION OF ABOUT 3.40% TO ABOUT 3.50% CARBON, ABOUT 0.50% TO ABOUT 0.60% MANGANESE, ABOUT 1.25% TO ABOUT 1.35% SILICON, ABOUT 0.30% TO ABOUT 0.50% CHROMIUM, ABOUT 0.75% TO ABOUT 1.25% NICKEL, ABOUT 0.15% PHOSPHORUS, ABOUT 0.10% SULFUR, THE REMAINDER IRON AND INCIDENTAL IMPURITIES.
Inventors
- 👤 Paul J Horvath Jr
Bibliographic Details
Claims Analysis
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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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |