STOCK COLD-ROLLED STEEL SHEET WITH FE-BASED COATING FILM, METHOD FOR PRODUCING STOCK COLD-ROLLED STEEL SHEET WITH FE-BASED COATING FILM, METHOD FOR PRODUCING COLD-ROLLED STEEL SHEET WITH FE-BASED COATING FILM, METHOD FOR PRODUCING HOT-DIPPED GALVANIZED STEEL SHEET, AND METHOD FOR PRODUCING ALLOYED HOT-DIPPED GALVANIZED STEEL SHEET

WIPO Patent Application WO/2022/244782

A1

The present invention provides a stock cold-rolled steel sheet with an Fe-based coating film, the stock cold-rolled steel sheet having excellent primary rust preventive properties or excellent plating appearance. This stock cold-rolled steel sheet with an Fe-based coating film comprises: a base steel sheet which has a component composition that contains, in mass%, 0.80% or less of C, from 0.10% to 3.00% of Si, from 1.50% to 3.50% of Mn, 0.100% or less of P, 0.0300% or less of S and 0.100% or less of Al, with the balance being made up of Fe and unavoidable impurities; an Fe-based coating film which is arranged on at least one surface of the base steel sheet; and a P-adhering Fe-based coating film which adheres to the surface of the Fe-based coating film, while comprising a P-containing material. The adhesion amount of the P-containing material in terms of P is 0.2 mg/m2 or more.

KANAZAWA TOMOMI (JP)
HOSHINO KATSUYA (JP)
YAMAMOTO SHUNSUKE (JP)

PCT/JP2022/020560

November 24, 2022

May 17, 2022

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JFE STEEL CORP (JP)

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

JPS63312960A	1988-12-21
JPS62139860A	1987-06-23
JPH0238549A	1990-02-07
JPH0499853A	1992-03-31
JPH04224686A	1992-08-13
JPH06287735A	1994-10-11
JPH08269780A	1996-10-15
JP2012172216A	2012-09-10
JPS5779160A	1982-05-18
JP2011214102A	2011-10-27

ITOH Hideaki et al. (JP)

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