Title:
STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2022/158469
Kind Code:
A1
Abstract:
This steel material includes a steel sheet base material and a protective film formed at least partially on the surface of the steel sheet base material. The steel sheet base material has a chemical composition containing, in mass%, 0.25-0.65% of C, 0.05-2.00% of Si, 0.30-3.00% 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, 0.05-1.00% of Cr, and 0.10-1.00% of Cu. The protective film has, when a measurement is performed thereon by an X-ray analysis using CuKα radiation, a peak where the peak intensity is more than 250% at a position where the diffraction angle (2θ) is 35.5±0.5°, when the peak intensity at a position where the diffraction angle (2θ) is 36.6±0.5° is defined as 100%. The steel material has a tensile strength of more than 1500 MPa.
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Inventors:
TABATA SHINICHIRO (JP)
KUSUMI KAZUHISA (JP)
SUZUKI YUKI (JP)
KUSUMI KAZUHISA (JP)
SUZUKI YUKI (JP)
Application Number:
PCT/JP2022/001710
Publication Date:
July 28, 2022
Filing Date:
January 19, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C23C22/05; C21D1/18; C21D9/00; C21D9/46; C22C38/00; C22C38/60; C23C2/12; C23C22/76
Domestic Patent References:
| WO2020162513A1 | 2020-08-13 | |||
| WO2016158961A1 | 2016-10-06 | |||
| WO2015182596A1 | 2015-12-03 | |||
| WO2015182591A1 | 2015-12-03 |
Foreign References:
| JPS62238378A | 1987-10-19 | |||
| JP2013237101A | 2013-11-28 | |||
| JP2013256701A | 2013-12-26 | |||
| JP2021006369A | 2021-01-21 | |||
| JP2002102980A | 2002-04-09 | |||
| JP2012180594A | 2012-09-20 | |||
| JP2012001802A | 2012-01-05 | |||
| JP4712838B2 | 2011-06-29 |
Other References:
See also references of EP 4230766A4
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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