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Title:
METHOD FOR MANUFACTURING BLACK PLATED STEEL SHEET, APPARATUS FOR MANUFACTURING BLACK PLATED STEEL SHEET, AND SYSTEM FOR MANUFACTURING BLACK PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2017/149800
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a method for manufacturing a black plated steel sheet that is capable of more evenly blackening the area of the plated steel sheet to be blackened. The present invention relates to a method for manufacturing a black plated steel sheet by bringing a plated steel sheet with an Al- and Mg-containing hot-dip galvanized layer containing Al and Mg into contact with water vapor inside a sealed vessel. This method performs, in the following order: a first step for heating a plated steel sheet disposed inside a sealed vessel in the presence of a gas, the dew point of which is always less than the plated steel sheet temperature; a second step for evacuating the heated ambient gas inside the sealed vessel to make the pressure of the gas inside the sealed vessel to be 70 kPa or less; and a third step for introducing water vapor inside the sealed vessel in which the pressure of the gas therein has been reduced to 70 kPa or less to blacken the galvanized layer.

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Inventors:
NAKANO TADASHI
UENO SHIN
YAMAMOTO MASAYA
Application Number:
PCT/JP2016/073386
Publication Date:
September 08, 2017
Filing Date:
August 09, 2016
Export Citation:
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Assignee:
NISSHIN STEEL CO LTD (JP)
International Classes:
C23C2/26; C22C18/00; C22C18/04; C22C21/10; C23C2/06; C23C2/40
Domestic Patent References:
WO2013161268A12013-10-31
WO2013161269A12013-10-31
Foreign References:
JP2012132061A2012-07-12
JPS6456881A1989-03-03
JP2013241655A2013-12-05
JP2013241676A2013-12-05
Other References:
See also references of EP 3425081A4
Attorney, Agent or Firm:
WASHIDA, Kimihito (JP)
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