GALVANNEALED STEEL SHEET, ELECTRODEPOSITION-COATED STEEL SHEET, AUTOMOTIVE VEHICLE COMPONENT, MANUFACTURING METHOD FOR ELECTRODEPOSITION-COATED STEEL SHEET, AND MANUFACTURING METHOD FOR GALVANNEALED STEEL SHEET

WIPO Patent Application WO/2022/097737

A1

Provided is a steel sheet that exhibits superior anti–resistance welding cracking characteristics in a welded part. A galvannealed steel sheet according to the present invention comprises: a Si-containing cold-rolled steel sheet containing 0.1-3.0 mass% Si; a Fe-based electroplated layer formed on at least one surface of the Si-containing cold-rolled steel sheet; and an galvannealed layer formed on the Fe-based electroplated layer, wherein in an intensity profile measured using glow discharge optical emission spectrometry, (ISi, Fe)/(ISi, bulk) is 0.30 or greater, and the average value of the C concentration in the range of 10-20 μm in the sheet thickness direction toward the Fe-based electroplated layer from the interface of the galvannealed layer and the Fe-based electroplated layer is 0.10 mass% or less.

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/JP2021/040875

May 12, 2022

November 05, 2021

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JFE STEEL CORP (JP)

C23C2/28; C21D9/46; C22C18/00; C22C38/00; C22C38/02; C22C38/60; C23C2/02; C23C2/06; C23C2/26; C23C2/40; C23C28/00

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
JP4791992B2	2011-10-12
JP6388099B1	2018-09-12

SUGIMURA Kenji (JP)

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