EP0226446A2
Expired / Lapsed
EP
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Method of producing thin steel sheets having an improved processability
Assignee: JFE Steel Corp
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Filing: 1986-12-10
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Granted: —
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Expires: 2006-12-10
Abstract
Abstract Thin steel sheets having an improved processability are produced when a steel sheet or cast strip obtained through a continuous casting or strip caster process is subjected to a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min. By this method, the cold rolling step or cold rolling-annealing step can be omitted.
Inventors
- 👤 Saiji Matsuoka
- 👤 Susumu Satoh
- 👤 Takashi Obara
- 👤 Kozo Tsunoyama
- 👤 Hideo Abe
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:31
CPC Classifications
C; C21; C21D; C21D7/00; C21D7/13; B; B21; B21B; B21B1/00; B21B1/46; B21B1/22; B21B1/24; B21B1/28; B21B1/30; B21B1/32; B21B1/34; C21D8/00; C21D8/02; C21D8/0221; C21D8/0226; B21B1/40; B21B2201/00; B21B2201/04; B21B2261/00; B21B2261/20; B21B2275/00; B21B2275/02; B21B2275/06; B21B9/00; C21D8/0231; C21D8/0247; C21D8/0263; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49991
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
48 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 2
Independent Claim
48 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 3
Independent Claim
53 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a finish hot rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 4
Independent Claim
53 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a finish hot rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 5
Independent Claim
65 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 6
Independent Claim
65 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 7
Independent Claim
70 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a finish hot rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 8
Independent Claim
70 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a finish hot rolling step and a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min.
Claim 9
Independent Claim
51 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 10
Independent Claim
51 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 11
Independent Claim
56 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a finish hot rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 12
Independent Claim
56 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a continuous casting step, a rough rolling step, a finish hot rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 13
Independent Claim
68 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 14
Independent Claim
68 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 15
Independent Claim
73 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a finish hot rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 16
Independent Claim
73 words
A method of producing thin steel sheets having an improved processability, comprising a combination of a step of directly and continuously producing a strip of not more than 50 mm in thickness from molten steel through a strip caster process, a finish hot rolling step, a lubrication rolling step at a temperature of from Ar₃ transformation point to 300°C and a rolling speed of not less than l,500 m/min and an annealing step.
Claim 17
Independent Claim
45 words
The method according to any one of claims 2, 4, 6 and 8, wherein said hot rolling is carried out at a temperature of from l,l00°C to 700°C under such a strong lubrication that a reduction rate of rolling load is not less than 30%.
Claim 18
Dependent Claim
25 words
l0. The method according to any one of claims l, 2, 5 and 6, wherein a coil box is arranged behind said rough rolling step.
Claim 19
Independent Claim
30 words
The method according to any one of claims 3, 4, 7 and 8, wherein a coil box is arranged behind said continuously strip producing step through the strip caster process.
Claim 20
Independent Claim
30 words
The method according to any one of claims 2, 4, 6, and 8, wherein a cooling device is arranged between said finish hot rolling step and said lubrication rolling step.
Claim 21
Independent Claim
24 words
The method according to any one of claims l, 2, 3 and 4, wherein a coiler is arranged just after said lubrication rolling step.
Claim 22
Independent Claim
29 words
The method according to any one of claims 5, 6, 7 and 8, wherein a cooling device is arranged between said the lubrication rolling step and said annealing step.
Claim 23
Independent Claim
67 words
The method according to any one of claims l, 2, 3 and 4, wherein a proximity coiler for taking up a steel sheet rolled at said lubrication rolling step so as to reduce the temperature drop of the steel sheet and an insulation box for maintaining the taken-up steel sheet within a temperature range of 750-600°C for a given time are arranged behind said lubrication rolling step.
Claim 24
Independent Claim
25 words
The method according to claim l0 or ll, wherein a sheet material decoiled from said coil box is joined by a sheet bar joining machine.
References Cited (Backward Citations)
No citation records indexed.
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