Title:
PROCESS FOR PRODUCING HOT-DIPPED HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2006/106999
Kind Code:
A1
Abstract:
A steel sheet produced by casting a steel containing at least 0.03 mass% carbon, at least 0.02 mass% silicon, at least 0.15 mass% manganese, and at least 0.001 mass% calcium by the thin-slab continuous casting method and hot-rolling the cast is oxidized by heating it at a heating rate of 25 °C/sec or higher to a maximum steel-sheet temperature of 550-650°C, excluding 650°C, for at least 15 seconds. The sheet is then reduced by heating it to a maximum steel-sheet temperature of 700-760°C in such a manner that the time period in which the steel sheet temperature is 570°C or higher is 25-45 seconds. Thereafter, the steel sheet is plated by hot dipping to produce a hot-dipped hot-rolled steel sheet.
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Inventors:
KATUBE MAKOTO (JP)
MIYAKE MASAYUKI (JP)
MIYAKE MASAYUKI (JP)
Application Number:
PCT/JP2006/306987
Publication Date:
October 12, 2006
Filing Date:
March 27, 2006
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
KATUBE MAKOTO (JP)
MIYAKE MASAYUKI (JP)
KATUBE MAKOTO (JP)
MIYAKE MASAYUKI (JP)
International Classes:
C21D9/46; C21D9/56; C22C38/00; C22C38/04; C23C2/02
Foreign References:
| JP2005060742A | 2005-03-10 | |||
| JP2003342644A | 2003-12-03 | |||
| JP3520155B2 | 2004-04-19 |
Attorney, Agent or Firm:
Aoki, Atsushi (Toranomon 37 Mori Bldg. 5-1, Toranomon 3-chom, Minato-ku Tokyo 23, JP)
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