Title:
HOT DIP-COATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2023/238941
Kind Code:
A1
Abstract:
The present invention employs a hot dip-coated steel sheet that comprises a hot dip-coated layer formed on a surface of a steel sheet. A pattern section and a non-pattern section are formed in the hot dip-coated layer. The pattern and non-pattern sections include a first region and a second region defined in the following, and the absolute value of the difference in the area percentage of the first region between the pattern and non-pattern sections is at least 30%. A cross-section parallel to the surface of the hot dip-coated layer and located at either one of positions of 3t/4, t/2, and t/4 from the surface is exposed. Then, virtual grid lines are drawn on each cross-section to divide the cross-section into a plurality of regions. A region, in which the ratio of the area fraction B of a [Zn phase] with respect to the total area fraction A of the [Zn phase] and a [ternary eutectic structure of Al/MgZn2/Zn] is at least 20%, is defined as the first region, and a region, in which said ratio is less than 20%, is defined as the second region.
Inventors:
TOBA TETSUYA (JP)
KAWAMURA YASUAKI (JP)
NAKAGAWA JUN (JP)
UEMURA SHINTARO (JP)
KOHIGASHI YUSUKE (JP)
TANAKA TOMOHITO (JP)
KAWAMURA YASUAKI (JP)
NAKAGAWA JUN (JP)
UEMURA SHINTARO (JP)
KOHIGASHI YUSUKE (JP)
TANAKA TOMOHITO (JP)
Application Number:
PCT/JP2023/021579
Publication Date:
December 14, 2023
Filing Date:
June 09, 2023
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C2/26; C22C18/00; C22C18/04; C23C2/06; C23C2/16
Domestic Patent References:
| WO2018169085A1 | 2018-09-20 | |||
| WO2021106259A1 | 2021-06-03 |
Foreign References:
| JP2002241962A | 2002-08-28 | |||
| JP2021508779A | 2021-03-11 | |||
| JPH0860324A | 1996-03-05 | |||
| CN109897990A | 2019-06-18 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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