Title:
CONTINUOUS ANNEALING APPARATUS, CONTINUOUS HOT-DIP GALVANIZATION APPARATUS, AND STEEL SHEET MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2023/286440
Kind Code:
A1
Abstract:
Provided is a continuous annealing apparatus capable of manufacturing a steel sheet having excellent hydrogen embrittlement resistance characteristics. This continuous annealing apparatus (100) has: a pay-off reel (10) for feeding a cold-rolled steel sheet (S) from a cold-rolled coil (C); an annealing furnace (20) through which the cold-rolled steel sheet (S) passes for continuous annealing, and which comprises a heating zone (22), a soaking zone (24), and a cooling zone (26) positioned in said order in the sheet passing direction from the upstream side of the annealing furnace (20), whereby the cold-rolled steel sheet (S) is annealed in a hydrogen-containing reducing atmosphere in the heating zone (22) and soaking zone (24), and the cold-rolled steel sheet (S) is cooled in the cooling zone (26); downstream equipment (30) through which the cold-rolled steel sheet (S) ejected from the annealing furnace (20) continues to pass; a tension reel (50) for taking up the cold-rolled steel sheet (S) passing through the downstream equipment (30); and a vibration application apparatus (60 or 70) for applying vibrations to the cold-rolled steel sheet (S) passing from the cooling zone (26) to the tension reel (50) such that the cold-rolled steel sheet has a vibrational frequency of 100 Hz to 100,000 Hz, and the cold-rolled steel sheet has a maximum amplitude of 10 nm to 500 µm.
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Inventors:
MINAMI HIDEKAZU (JP)
ENDOH KAZUKI (JP)
TOJI YUKI (JP)
ENDOH KAZUKI (JP)
TOJI YUKI (JP)
Application Number:
PCT/JP2022/020579
Publication Date:
January 19, 2023
Filing Date:
May 17, 2022
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D3/06; C21D1/26; C21D9/56; C22C38/00; C22C38/06; C22C38/58; C22C38/60; C23C2/00; C23C2/06; C23C2/40
Domestic Patent References:
| WO2017145322A1 | 2017-08-31 | |||
| WO2019188642A1 | 2019-10-03 |
Foreign References:
| JP2020153003A | 2020-09-24 | |||
| JPS5665934A | 1981-06-04 | |||
| JPS62287019A | 1987-12-12 | |||
| JP2019173099A | 2019-10-10 | |||
| JP2004131794A | 2004-04-30 | |||
| JP2010185101A | 2010-08-26 |
Attorney, Agent or Firm:
SUGIMURA Kenji (JP)
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