EP0194118A2
Expired / Lapsed
EP
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Production of formable thin steel sheet excellent in ridging resistance
Assignee: JFE Steel Corp
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Filing: 1986-02-28
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Granted: —
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Expires: 2006-02-28
Abstract
Abstract A process for producing a formable thin steel sheet excellent in ridging resistance. Said process comprises finishing a low carbon steel at a strain rate of not less than 300 (s 1 ) in a temperature range of 800 to 300°C in at least one pass when the low carbon steel is rolled into a specified thickness, and subsequently performing recrystallization annealing.
Inventors
- 👤 Susumu C/O Technical Research Division Satoh
- 👤 Saiji C/O Technical Research Division Matsuoka
- 👤 Takashi C/O Technical Research Division Obara
- 👤 Kozo C/O Technical Research Division Tsunoyama
- 👤 Toshio C/O Technical Research Division Irie
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 04:17
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/46; C21D9/48; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; B; B21; B21B; B21B2201/00; B21B2201/04; C21D8/0431; C21D8/0447; C21D8/0463
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
A process for producing a formable thin steel sheet excellent in ridging resistance, which comprises finishing a low carbon steel at a strain rate (ε ) of not less than 300 (s -1 ) in a temperature range of 800 to 300°C in at least one pass when the low carbon steel is rolled into a specified thickness, and subsequently performing recrystallization annealing.
Claim 2
Dependent Claim
63 words
A process for producing a formable thin steel sheet excellent in ridging resistance, which comprises finishing a low carbon steel at a strain rate (ε ) of not less than 300 (s -1 ) in a temperature range of 800 to 300°C in at least one pass when the low carbon steel is rolled into a specified thickness, and subsequently performing recrystallization annealing.
Claim 3
Dependent Claim
37 words
- 2. A process for producing a formable thin steel sheet excellent in ridging resistance according to claim 1, wherein said finishing is performed under the conditions of ε≧0.8T+60 in which T is a rolling temperature (°C).
Claim 4
Dependent Claim
39 words
A process for producing a formable thin steel sheet excellent in ridging resistance according to claim 1, wherein the rolling is carried out under the condition that the coefficient of friction (p) and the strain rate (ε) satisfy ε/µ≧1,000.
Claim 5
Dependent Claim
27 words
A process for producing a formable thin steel sheet excellent in ridging resistance according to claim 1, wherein the rolling is carried out under application of tension.
Claim 6
Dependent Claim
34 words
A process for producing a formable thin steel sheet excellent in ridging resistance according to claim 1, wherein the coiling is carried out at not more than 400°C between the rolling and recrystallization annealing.
Claim 7
Dependent Claim
37 words
A process for producing a formable steel sheet excellent in ridging resistance according to claim 1, wherein the finishing is carried out under the relation of ε/R≧2.0 in which R is a radius (mm) of work rolls.
Claim 8
Dependent Claim
52 words
A process for producing a formable steel sheet excellent in ridging resistance according to claim 1, wherein the finishing is carried out at a coiling temperature of not more than 400°C, and the recrystallization and a plating are subsequently carried out in continuous hot metal dipping line of an in-line annealing system.
Claim 9
Dependent Claim
53 words
A process for producing a formable thin steel sheet excellent in ridging resistance according to claim 1, wherein the finishing is carried out under the conditions that a limit strain rate (ε c ) complying with the following equation (1) satisfies the following relation (2). in which T is a rolling temperature (°C).
References Cited (Backward Citations)
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