Patent US4026729A successfully refreshed from Google Patents.
US4026729A
Expired / Lapsed
US
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Method of making a soft steel sheet by continuous annealing
Assignee: JFE Engineering Corp
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Filing: 1975-11-17
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Granted: 1977-05-31
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Expires: 1995-11-17
Abstract
Abstract In a process of making a cold-reduced steel strip for press-forming by a continuous annealing process comprising a rapid cooling step after recrystallization heating and an over-aging treatment step, when no spray of cooling water at the runout table before coiling in the hot-rolling stage is carried out on the top side and the bottom side of a travelling hot-rolled steel strip by about 20 to 200m respectively, a cold reduced soft steel sheet for press-forming is easily obtained by the above continuous annealing process.
Inventors
- 👤 Kazuhide Nakaoka
- 👤 Kenji Araki
- 👤 Takayoshi Shimomura
- 👤 Haruo Kubotera
- 👤 Shinobu Osaka
- 👤 Nobuo Tanaka
- 👤 Hiroshi Kuroda
- 👤 Takao Kurihara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:55
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; C21D9/00; C21D9/52; C21D9/54; C21D9/68
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
In a continuous annealing process of making cold-reduced press-forming sheet of Al-killed, rimmed, silicon semi-killed or capped steel, the improvement of imparting uniform quality over the entire length of said steel sheet, comprising the steps of (A) mounting said steel strip on a run-out table after hot rolling; (B) starting impinging water jet on said steel strip after said steel strip has travelled 20 to 200 meters; (C) stopping said water cooling before 20 to 200 meters of the end of said steel strip; and (D) coiling the said strip at a temperature of more than 630° C., thereby to provide uniform self-annealing effect over the entire length of said strip, said process being characterized by the absence of any water being applied to either end of said sheet for a distance of 20 to 200 meters.
Claim 2
Dependent Claim
137 words
In a continuous annealing process of making cold-reduced press-forming sheet of Al-killed, rimmed, silicon semi-killed or capped steel, the improvement of imparting uniform quality over the entire length of said steel sheet, comprising the steps of (A) mounting said steel strip on a run-out table after hot rolling; (B) starting impinging water jet on said steel strip after said steel strip has travelled 20 to 200 meters; (C) stopping said water cooling before 20 to 200 meters of the end of said steel strip; and (D) coiling the said strip at a temperature of more than 630° C., thereby to provide uniform self-annealing effect over the entire length of said strip, said process being characterized by the absence of any water being applied to either end of said sheet for a distance of 20 to 200 meters.
References 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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |