Title:
STEEL PLATE AND METHOD FOR MANUFACTURING STEEL PLATE
Document Type and Number:
WIPO Patent Application WO/2022/070636
Kind Code:
A1
Abstract:
A steel plate according to the present embodiment is such that: the Ti content and N content satisfy Ti - 3.5 × N ≥ 0.003; a metal structure includes 90% or more martensite, in terms of volume fraction, at a 1/4 plate thickness position; a number density of TiC having a circle-equivalent diameter of 1 to 500 nm is 3.5 × 104/mm2 or more at the 1/4 plate thickness position; a median Mn concentration value + 3σ value is 5.00% or less at the 1/4 plate thickness position; and a hardness measured at the 1/4 plate thickness position is 1.30 times or more than the hardness measured at a position at a depth of 50 µm from the surface of the steel plate.
Inventors:
IKEDA ARISA (JP)
TAKEDA KENGO (JP)
TAKEDA KENGO (JP)
Application Number:
PCT/JP2021/029952
Publication Date:
April 07, 2022
Filing Date:
August 16, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/60
Domestic Patent References:
| WO2010109702A1 | 2010-09-30 | |||
| WO2018062381A1 | 2018-04-05 | |||
| WO2018062380A1 | 2018-04-05 | |||
| WO2016152163A1 | 2016-09-29 | |||
| WO2016129550A1 | 2016-08-18 | |||
| WO2017183057A1 | 2017-10-26 |
Foreign References:
| JP2018003114A | 2018-01-11 | |||
| JP2020165790A | 2020-10-08 | |||
| JP2014047414A | 2014-03-17 | |||
| JP2018003114A | 2018-01-12 |
Other References:
BULLETIN OF THE JAPAN INSTITUTE OF METAL, vol. 44, no. 3, 2005, pages 254 - 256
See also references of EP 4223899A4
See also references of EP 4223899A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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