US3896653A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing differential thickness steel plate
Assignee: Nippon Steel Corp
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Filing: 1972-09-14
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Granted: 1975-07-29
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Expires: 1992-09-14
Abstract
Abstract A method for producing a differential thickness steel plate having a step portion at least on one side by hot rolling a steel material comprising reversing the hot rolling at the half-way region of the steel material and effecting the rolling with a finishing temperature in a temperature range of 680* to 1050*C.
Inventors
- 👤 Kazuo Sakai
- 👤 Ken Iwanaga
- 👤 Kazuo Maehara
- 👤 Tsuyoshi Nakajima
- 👤 Koki Yotsuya
- 👤 Humio Ookuma
- 👤 Takeo Baba
- 👤 Toshitaka Yamanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:09
CPC Classifications
B; B21; B21B; B21B37/00; B21B37/16; B21B37/24; B21B37/26; B21B1/00; B21B1/02; B21B1/026; B21B1/38
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
99 words
A method for producing a differential thickness steel plate having a step portion at least on one side by hot rolling a steel material through a rolling mill comprising adjusting the rollers of the rolling mill to a preset roll gap, conveying the steel material to the rolling mill, rolling the steel material commencing with an end thereof in the rolling mill, reversing the direction of rolling of the steel material after a specific portion thereof has been rolled, and finishing said rolling with a temperature range of 680* to 1050*C whereby a differential thickness steel plate is formed.
Claim 2
Independent Claim
99 words
A method for producing a differential thickness steel plate having a step portion at least on one side by hot rolling a steel material through a rolling mill comprising adjusting the rollers of the rolling mill to a preset roll gap, conveying the steel material to the rolling mill, rolling the steel material commencing with an end thereof in the rolling mill, reversing the direction of rolling of the steel material after a specific portion thereof has been rolled, and finishing said rolling with a temperature range of 680* to 1050*C whereby a differential thickness steel plate is formed.
Claim 3
Dependent Claim
36 words
A method according to claim 1, wherein said temperature range is between 680* and 850*C, and said step of reversing the direction of rolling comprises forming a step portion on both sides of the steel material.
Claim 4
Dependent Claim
45 words
A method according to claim 1, wherein said temperature range is between 850* and 1050*C, and said step of finishing said rolling comprises forming a step portion on only one side of the steel material and a flat, continuous portion on the other side thereof.
Claim 5
Dependent Claim
38 words
A method according to claim 3, wherein said rolling of the steel material commences with the tail end thereof, and said step of reversing the direcTion comprises reversing the direction at the half-way region of the steel material.
Claim 6
Dependent Claim
47 words
A method according to claim 3, wherein said step of forming a flat portion comprises contacting the other side of the steel material with a roller table whereby the steel material is caused to level out and form a flat portion due to the force of gravity.
Claim 7
Dependent Claim
62 words
A method according to claim 1, wherein said step of reversing the direction of the steel material comprises forming a differential steel plate having a step portion in both sides thereof, and said step of finishing comprises transferring the steel plate to a roller table so as to form a differential steel plate with a step portion on only one side thereof.
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) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |