Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2015/029404
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a high-strength hot-dip galvanized steel sheet having a steel plate containing Si and Mn as a substrate steel sheet and having an exceptional surface appearance devoid of unplating or blister defects, and a method for manufacturing the high-strength hot-dip galvanized steel sheet. A high-strength hot-dip galvanized steel sheet characterized in that: the high-strength hot-dip galvanized steel sheet has a substrate steel sheet having a specific component composition and a galvanized layer formed on the surface of the substrate steel sheet, the galvanized layer having a coating weight per surface of 20 g/m2 to 120 g/m2; the total amount of hydrogen measured using a specific method is 0.05 mass ppm to 0.40 mass ppm; and ISi
sur/ISi
bulk and IMn
sur/IMn
bulk calculated using a specific method is ISi
sur/ISi
bulk ≤ 2.0 and IMn
sur/IMn
bulk ≤ 3.0, respectively.
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Inventors:
HARAKO DAISUKE (JP)
IWATA TETSUYA (JP)
IWATA TETSUYA (JP)
Application Number:
PCT/JP2014/004338
Publication Date:
March 05, 2015
Filing Date:
August 22, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D1/74; C23C2/02; C21D3/06; C21D9/46; C22C18/00; C22C18/04; C22C38/00; C22C38/06; C23C2/06; C23C2/40
Foreign References:
| JP2000309824A | 2000-11-07 | |||
| JPH02267251A | 1990-11-01 | |||
| JPH10204597A | 1998-08-04 | |||
| JPH09118968A | 1997-05-06 | |||
| JP2006037130A | 2006-02-09 | |||
| JP2008261027A | 2008-10-30 | |||
| JPH0913156A | 1997-01-14 | |||
| JP2013142198A | 2013-07-22 | |||
| JPS54130443A | 1979-10-09 | |||
| JP2010255111A | 2010-11-11 | |||
| JP2010255113A | 2010-11-11 | |||
| JPH05295483A | 1993-11-09 |
Other References:
See also references of EP 3040440A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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