Title:
CONTINUOUS HOT-DIP ZINC PLATING FACILITY
Document Type and Number:
WIPO Patent Application WO/2013/150710
Kind Code:
A1
Abstract:
Provided is a continuous hot-dip zinc plating facility which can prevent, without fail, the surface of a steel sheet from being oxidized in an annealing furnace and can thereby attain stable production of a zinc-coated steel sheet having an excellent coating layer. This continuous hot-dip zinc plating facility has an annealing furnace of an all radiant tube heating type, said annealing furnace being provided with a water removal unit by which an atmospheric gas present in the annealing furnace is recovered, freed from water, and then returned to the furnace. In the annealing furnace, both a dew-point instrument for measuring the dew point of an atmospheric gas present in the furnace and a discharge port for recovering an atmospheric gas present in the furnace are disposed at each of at least two points. One of the points is a point present on the side wall in the neighborhood of the inlet of the annealing furnace, and the other thereof is a point which is present on the side wall in the neighborhood of the furnace top- or bottom-side end and at which the temperature of a steel sheet reaches the maximum. Further, supply ports for supplying the atmospheric gas which has been freed from water in the water removal unit to the furnace are disposed respectively on the side walls at points which are opposite to the two points in the heightwise direction of the furnace. Thus, the continuous hot-dip zinc plating facility makes it possible to control stably the dew point of an atmospheric gas to -45 to -80°C over the whole area of an annealing furnace.
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Inventors:
SATO NOBUYUKI (JP)
Application Number:
PCT/JP2013/001156
Publication Date:
October 10, 2013
Filing Date:
February 27, 2013
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/56; C21D1/76; C23C2/00
Domestic Patent References:
| WO2012081719A1 | 2012-06-21 |
Foreign References:
| JPH07138652A | 1995-05-30 | |||
| JP2010255100A | 2010-11-11 | |||
| JPS55122865A | 1980-09-20 | |||
| JPS55122865A | 1980-09-20 | |||
| JP2010255100A | 2010-11-11 | |||
| JPH04116127A | 1992-04-16 | |||
| JPH05271891A | 1993-10-19 | |||
| JPH11236623A | 1999-08-31 |
Other References:
See also references of EP 2835432A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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