Heattreatment of steel
Abstract
Abstract The present invention relates to the heattreatment of steel. More particularly it relates to the heattreatment of all types of iron and steel which are capable of hardening on heating to the austenitising range and then quenching, without the need to introduce additional carbon during the heating step. For the sake of simplicity these types of iron and steel will be referred to hereinafter as ''''steel of the class which can be hardened by heating and quenching.'''' This class of materials comprises the plain carbon steels and cast steel of the medium- and high-carbon varieties and the alloy steels containing at least 0.25 percent by weight carbon. The present invention provides a method of heattreating steel of this class whereby the steel is provided with a surface layer that is resistant to scuffing and wear when subjected to friction under a heavy load and the underlying core is hardened so as to be resistant to indentation.
Inventors
- 👤 Frederick David Waterfall
Bibliographic Details
Claims Analysis
Total Claims: 4References 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) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |