US3805571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuous treatment of low-carbon cold-rolled steel sheet having excellent cold working properties
Assignee: Nippon Steel Corp
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Filing: 1973-06-18
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Granted: 1974-04-23
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Expires: 1993-06-18
Abstract
Abstract An apparatus for continuous treatment of cold rolled steel sheet. The apparatus has a continuous annealing furnace through which the sheet is continuously passed and which is composed of, in succession, a heating chamber for heating the cold rolled steel sheet to a temperature range of 700* to 900*C within 2 minutes, a soaking chamber for keeping the sheet in the above temperature range for two minutes or less, a primary cooling chamber for rapidly cooling the sheet from the above temperature range to an overageing at a rate of 5* to 30*C/sec., an overageing chamber for keeping the sheet between 300* to 400*C for up to eight minutes, and a secondary cooling chamber for cooling the sheet from the above overageing temperature to below 50*C within 2 minutes. Adjacent the output end of said furnace is apparatus for successively skin pass rolling, levelling and recoiling the sheet from the annealing furnace. The skin pass rolling apparatus has apparatus for replacing the working rolls.
Inventors
- 👤 K Toda
- 👤 H Gondo
- 👤 R Katsutani
- 👤 T Kawano
- 👤 B Kawasaki
- 👤 M Abe
- 👤 T Tsukamura
- 👤 T Nishimura
- 👤 Y Tadashige
- 👤 M Morimoto
- 👤 K Suemune
- 👤 M Shiraishi
- 👤 N Uehara
- 👤 Y Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:49
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; B; B21; B21B; B21B31/00; B21B31/08; B21B31/10; C21D8/0447; C21D8/0452; C21D8/0473; C21D9/00; C21D9/52; C21D9/54; C21D9/56; B21B1/00; B21B1/22; B21B2001/228; B21B15/00; B21B2015/0071; B21B39/00; B21B39/02; B21B39/08; C21D8/0436; C21D8/0442; C21D9/562; C21D9/563; C21D9/573
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
An apparatus for continuous treatment of cold rolled steel sheet comprising a continuous annealing furnace through which the sheet is continuously passed and which is composed of, in succession, a heating chamber for heating the cold rolled steel sheet to a temperature range of 700*C to 900*C within 2 minutes, a soaking chamber for keeping the sheet in the above temperature range for two minutes or less, a primary cooling chamber for rapidly cooling the sheet from the above temperature range to an overageing temperature at a rate of 5* to 30*C/sec., an overageing chamber for keeping the sheet between 300* to 400*C for up to 8 minutes, and a secondary cooling chamber for cooling the sheet from the above overageing temperature to below 50*C within 2 minutes, and means adjacent the output end of said furnace for successively skin pass rolling, levelling and recoiling the sheet from the annealing furnace.
Claim 2
Independent Claim
151 words
An apparatus for continuous treatment of cold rolled steel sheet comprising a continuous annealing furnace through which the sheet is continuously passed and which is composed of, in succession, a heating chamber for heating the cold rolled steel sheet to a temperature range of 700*C to 900*C within 2 minutes, a soaking chamber for keeping the sheet in the above temperature range for two minutes or less, a primary cooling chamber for rapidly cooling the sheet from the above temperature range to an overageing temperature at a rate of 5* to 30*C/sec., an overageing chamber for keeping the sheet between 300* to 400*C for up to 8 minutes, and a secondary cooling chamber for cooling the sheet from the above overageing temperature to below 50*C within 2 minutes, and means adjacent the output end of said furnace for successively skin pass rolling, levelling and recoiling the sheet from the annealing furnace.
Claim 3
Dependent Claim
46 words
An apparatus according to claim 1 in which the primary cooling chamber has a jet cooling system for rapiD cooling of the sheet from a temperature range of 700* to 900*C to a temperature range of 300* to 450*C at a rate of less than 20*C/sec.
Claim 4
Dependent Claim
72 words
An apparatus according to claim 1 in which the secondary cooling chamber has gas jet means therein for jetting water cooled gas for cooling the sheet from the overageing temperature to 100*C and has further gas jet means for further cooling the sheet below 100*C, and gas supply means coupled to said further gas jet means and including gas refrigerating means for regrigerating the gas supplied to said further gas jet means.
Claim 5
Dependent Claim
109 words
An apparatus according to claim 1 in which the overageing chamber has a hearth roll therein over which the steel sheet runs which has a roll diameter which satisfies the following formula: d/R < or = 2.02 X 103 - 1.05 X 103 log (t + 1) in which d is the thickness in millimeters of the steel sheet, R is the bending radius in millimeters and t is the time in minutes during which stress is given to the sheet, and the secondary cooling chamber has in series gas jet means for blowing gas cooled by cooling water and gas jet means for blowing gas cooled by refrigeration.
Claim 6
Dependent Claim
77 words
An apparatus according to claim 1 in which the skin pass rolling means is a skin pass rolling mill having a pair of work rolls and a pair of back-up rolls backing up said work rolls, and driving means coupled to one of said pair of rolls, and bridle rolls between said skin pass rolling mill and said levelling means for continuous feeding of the steel sheet from the skin pass rolling mill to said levelling means.
Claim 7
Dependent Claim
140 words
An apparatus according to claim 1 in which said skin pass rolling means comprises a skin pass rolling mill having a housing and working rolls housed in said housing, a support frame for supporting a replacement working roll, a truck arranged on one side of the roll mill on which said support frame is positioned, a means on said support frame for placing the replacement working roll in coaxial alignment with a used roll in the rolling mill, a means on said truck for pushing the replacement roll toward the housing to thereby push the used roll out of the housing, another truck arranged on the opposite side of the rolling mill from said firstmentioned truck, and a further support frame on said further truck for receiving and holding the used roll when it is pushed thereonto from the housing.
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) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |