Patent US3877684A successfully refreshed from Google Patents.
US3877684A
Expired / Lapsed
US
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Continuous annealing furnace
Assignee: JFE Engineering Corp
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Filing: 1974-01-10
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Granted: 1975-04-15
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Expires: 1994-01-10
Abstract
Abstract In a continuous annealing for steel strip furnace comprising recrystallization heating zone, rapid cooling zone, carbon precipitation treating zone and final cooling zone, improved facilities characterized in that said rapid cooling zone is divided into a gas-jet cooling zone and a water-quenching zone and an alternate path for said steel strip is provided parallel with said water quenching zone such that the said strip may bypass said water quenching zone if necessary for a required rapid cooling rate.
Inventors
- 👤 Takao Kurihara
- 👤 Nobuo Tanaka
- 👤 Toru Yamagishi
- 👤 Kazuhide Nakaoka
- 👤 Kenzi Araki
- 👤 Kozi Iwase
- 👤 Haruo Kubotera
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:53
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/573
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
In a continuous annealing furnace for steel strip comprising a recrystallization heating zone, a rapid cooling zone, a carbon precipitation treating zone and a final cooling zone, improved facilities characterized in that said rapid cooling zone is divided into a gas-jet cooling zone and a water-quenching zone and an alternate path for said steel strip is provided parallel with said water-quenching zone such that the said strip may bypass the said water quenching zone if necessary for a required rapid cooling rate.
Claim 2
Dependent Claim
82 words
In a continuous annealing furnace for steel strip comprising a recrystallization heating zone, a rapid cooling zone, a carbon precipitation treating zone and a final cooling zone, improved facilities characterized in that said rapid cooling zone is divided into a gas-jet cooling zone and a water-quenching zone and an alternate path for said steel strip is provided parallel with said water-quenching zone such that the said strip may bypass the said water quenching zone if necessary for a required rapid cooling rate.
Claim 3
Dependent Claim
37 words
Improved facilities as set forth in claim 1 wherein when the thickness of said travelling strip is more than about 0.6mm, said gas-jet cooling zone and then said water-quenching zone are employed as said rapid cooling zone.
Claim 4
Dependent Claim
56 words
Improved facilities as set forth in claim 1 wherein when the thickness of said travelling strip is less than about 0.5mm, only said gas-jet cooling zone is employed as said rapid cooling zone and said zone is connected directly to said following carbon precipitation treating zone through said alternate path provided parallel with said water-quenching zone.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |