Title:
STEEL SHEET, STEEL MEMBER, AND COATED STEEL MEMBER
Document Type and Number:
WIPO Patent Application WO/2022/196733
Kind Code:
A1
Abstract:
In this steel member, a steel sheet base material, which comprises, by mass%, 0.10 to 0.65% of C, 0.10 to 2.00% of Si, 0.30 to 3.00% of Mn, 0.050% or less of P, 0.0100% or less of S, 0.010% or less of N, 0.010% or less of O, 0 to 0.100% of Ti, 0 to 0.0100% of B, 0 to 1.00% of Cr, 0 to 1.00% of Mo, 0 to 1.00% of Ni, 0 to 0.10% of Nb, 0 to 1.00% of Cu, 0 to 1.00% of V, 0 to 0.010% of Ca, 0 to 0.010% of Mg, 0 to 1.00% of Al, 0 to 1.00% of Sn, 0 to 1.00% of W, 0 to 1.00% of Sb, 0 to 1.00% of Zr, 0 to 1.00% of Co, 0 to 0.30% of REM, and the balance Fe and impurities, has a surface scale and a decarburized layer formed on the interface side with the scale, wherein the decarburized layer has an internal oxidized layer formed on the interface side with the scale, the depth of the decarburized layer from the interface between the steel sheet base material and the scale is 60 µm or greater, the depth of the internal oxidized layer from the interface is less than 40 µm, and the scale contains 70 mass% or more of Fe.
Inventors:
TABATA SHINICHIRO (JP)
KUSUMI KAZUHISA (JP)
KUSUMI KAZUHISA (JP)
Application Number:
PCT/JP2022/011972
Publication Date:
September 22, 2022
Filing Date:
March 16, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D7/06; C21D1/18; C21D9/00; C21D9/46; C22C38/00; C22C38/60; C23C8/18
Domestic Patent References:
| WO2019116531A1 | 2019-06-20 | |||
| WO2016111273A1 | 2016-07-14 | |||
| WO2017145322A1 | 2017-08-31 | |||
| WO2016152870A1 | 2016-09-29 | |||
| WO2015182596A1 | 2015-12-03 | |||
| WO2015182591A1 | 2015-12-03 |
Foreign References:
| JP2017075394A | 2017-04-20 | |||
| JP2010043323A | 2010-02-25 | |||
| JP2017518438A | 2017-07-06 | |||
| JP2015030890A | 2015-02-16 | |||
| JP2021043720A | 2021-03-18 | |||
| JP2002102980A | 2002-04-09 | |||
| JP2012180594A | 2012-09-20 | |||
| JP2012001802A | 2012-01-05 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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