Title:
STEEL PLATE, MEMBER, AND METHOD FOR MANUFACTURING SAID STEEL PLATE AND MEMBER
Document Type and Number:
WIPO Patent Application WO/2021/085335
Kind Code:
A1
Abstract:
The purpose of the present invention is to provide a steel plate and a member that are high in strength and have outstanding uniformity of shape and shape fixability, and a method for manufacturing the same. A steel plate according to the present invention comprises, in area ratios, 20%–100% martensite, 0%–80% ferrite, and 5% or less of other metal phases. The steel plate has a steel structure in which, at the surface of the steel plate, the proportion of the dislocation density of metal phases at the plate-width end relative to the dislocation density of metal phases at the plate-width center is 100%–140%; and at the midpoint of the steel plate thickness, the proportion of the dislocation density of the metal phases at the plate-width end relative to the dislocation density of metal phases at the plate-width center is 100%–140%; and the maximum warpage of the steel plate when the steel plate is subjected to shear over the length of 1 m in the rolling direction is 15 mm or less.
Inventors:
HIRASHIMA TAKUYA (JP)
YOSHIOKA SHIMPEI (JP)
KANEKO SHINJIRO (JP)
YOSHIMOTO SOSHI (JP)
HASHIMUKAI TOMOHIRO (JP)
YOSHIOKA SHIMPEI (JP)
KANEKO SHINJIRO (JP)
YOSHIMOTO SOSHI (JP)
HASHIMUKAI TOMOHIRO (JP)
Application Number:
PCT/JP2020/039950
Publication Date:
May 06, 2021
Filing Date:
October 23, 2020
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/06; C22C38/60
Domestic Patent References:
| WO2020026838A1 | 2020-02-06 |
Foreign References:
| JP2017119912A | 2017-07-06 | |||
| JPH08176884A | 1996-07-09 | |||
| JPS462733B1 | 1971-01-23 | |||
| JP2020019992A | 2020-02-06 | |||
| JP2005272988A | 2005-10-06 | |||
| JP2012229466A | 2012-11-22 | |||
| JP6094722B2 | 2017-03-15 |
Other References:
See also references of EP 4015661A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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