Title:
GALVANIZED STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2024/024310
Kind Code:
A1
Abstract:
The purpose of the present disclosure is to provide a galvanized steel sheet subjected to complicated molding for which it is difficult to adopt press molding, the galvanized steel sheet having a lubricating film which has: a small sliding resistance at a site having the risk of being cracked during press molding; and excellent press moldability at a site which has high surface pressure and in which the occurrence of mold galling is estimated. The present invention involves forming, on the surface of a galvanized steel sheet, a film containing: an acrylic resin having a glass transition point (Tg) of at least 100ºC and an acid value ratio R=acid value (mg-KOH/g)/Tg (ºC) of at least 1.50; and at least 5 mass% of a polyolefin wax having a melting point of 100-145ºC and an average particle diameter of at most 3.0 μm, so that the adhesion amount thereof per surface is in the range of 0.2 g/m2 to 2.5 g/m2.
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Inventors:
FURUYA SHINICHI (JP)
MATSUDA TAKESHI (JP)
KUSAKA SHOTA (JP)
MATSUDA TAKESHI (JP)
KUSAKA SHOTA (JP)
Application Number:
PCT/JP2023/021996
Publication Date:
February 01, 2024
Filing Date:
June 14, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C28/00; B32B15/18; B32B27/30; C23C2/06; C23C26/00
Domestic Patent References:
| WO2022123930A1 | 2022-06-16 | |||
| WO2003083000A1 | 2003-10-09 | |||
| WO2020162562A1 | 2020-08-13 | |||
| WO2011161968A1 | 2011-12-29 |
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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