Procedure for manufacture of steel band or strip
Abstract
Abstract A process for manufacture of a steel band or steel strip, the steel comprising spheroidal carbide particles in a ferritic base, wherein a steel, the major part of which is a carbonaceous ferritic austenite conversion product which is, structurally, at least one of lamellar perlite, granular perlite, sorbite, bainite and martensite, and which is at a temperature below the steel A cl -temperature is heated to a temperature which is above the A cl -temperature and within the ferrite metastability range, the steel is then rolled at a temperature in the said metastable temperature range, and the steel is then cooled to below the A cl -temperature, the heating, rolling and cooling taking place in a time short enough to ensure that no substantial conversion to austenite occurs in the steel.
Inventors
- 👤 Bo Lennart Janzon
Bibliographic Details
Claims Analysis
Total Claims: 7References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |