GALVANIZED STEEL SHEET, ELECTRODEPOSITION COATED STEEL SHEET, AUTOMOTIVE PART, METHOD FOR MANUFACTURING ELECTRODEPOSITION COATED STEEL SHEET, AND METHOD FOR MANUFACTURING GALVANIZED STEEL SHEET

WIPO Patent Application WO/2022/097736

A1

The present invention provides a steel sheet having a superior anti resistance-welding-cracking property at a welded section. Provided is a galvanized steel sheet including: a Si-containing cold-rolled steel sheet containing 0.1 to 3.0 mass% of Si; an Fe-based electroplated layer formed on at least one side of the Si-containing cold-rolled steel sheet with the adhesion quantity per side being at least 5.0 g/m2; and a galvanized layer formed on the Fe-based electroplated layer, wherein (ISi, Fe)/(ISi, bulk) is at least 0.50 in a strength profile measured by glow discharge optical emission spectrometry, and the average value of the C concentration in the range of 10 to 20 µm extending toward the Fe-based electroplated layer from the interface between the galvanized layer and the Fe-based electroplated layer is at most 0.10 mass%.

YAMAMOTO SHUNSUKE (JP)
TAKASHIMA KATSUTOSHI (JP)
OKUMURA YUSUKE (JP)
KANAZAWA TOMOMI (JP)
HOSHINO KATSUYA (JP)
KAWANO TAKASHI (JP)
YAMASHITA TAKAKO (JP)
MATSUDA HIROSHI (JP)
MAKIMIZU YOICHI (JP)

PCT/JP2021/040874

May 12, 2022

November 05, 2021

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JFE STEEL CORP (JP)

C25D5/26; B23K11/00; B23K11/11; B23K11/16; C22C38/00; C22C38/02; C22C38/60; C23C2/02; C25D5/50

WO1993020254A1	1993-10-14
WO2020148944A1	2020-07-23

JP2015504976A	2015-02-16
JPH04214895A	1992-08-05
JPH06128758A	1994-05-10
JP2011214102A	2011-10-27
JP2013087314A	2013-05-13
JP6388099B1	2018-09-12

See also references of EP 4242359A1

SUGIMURA Kenji (JP)

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