Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2022/044494
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a predetermined chemical composition and is configured such that: with respect to the metal structure thereof, residual austenite constitutes less than 3.0% by area, ferrite constitutes less than 15.0% by area, and pearlite constitutes less than 5.0% by area; the E value which shows the periodicity of the metal structure is less than 10.7; the I value which shows the uniformity of the metal structure is less than 1.020; the standard deviation of the Mn concentration is 0.60% by mass or less; and the tensile strength is 780 MPa or more.
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Inventors:
YOSHIDA MITSURU (JP)
SHUTO HIROSHI (JP)
TSUTSUI KAZUMASA (JP)
HAYASHI KOUTAROU (JP)
SHUTO HIROSHI (JP)
TSUTSUI KAZUMASA (JP)
HAYASHI KOUTAROU (JP)
Application Number:
PCT/JP2021/022672
Publication Date:
March 03, 2022
Filing Date:
June 15, 2021
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/58
Domestic Patent References:
| WO2021065346A1 | 2021-04-08 |
Foreign References:
| JP2017150051A | 2017-08-31 | |||
| JP2015160984A | 2015-09-07 | |||
| JP2007070661A | 2007-03-22 | |||
| JP2020143746A | 2020-09-10 | |||
| JPH10168544A | 1998-06-23 | |||
| JP2005298924A | 2005-10-27 |
Other References:
J. WEBELJ. GOLAD. BRITZE MUCKLICH, MATERIALS CHARACTERIZATION, vol. 144, 2018, pages 584 - 596
D. L. NAIKH. U. SAJIDR. KIRAN, METALS, vol. 9, 2019, pages 546
K. ZUIDERVELD: "Contrast Limited Adaptive Histogram Equalization", 1994, ACADEMIC PRESS, article "Graphics Gems IV", pages: 474 - 485
See also references of EP 4180546A4
D. L. NAIKH. U. SAJIDR. KIRAN, METALS, vol. 9, 2019, pages 546
K. ZUIDERVELD: "Contrast Limited Adaptive Histogram Equalization", 1994, ACADEMIC PRESS, article "Graphics Gems IV", pages: 474 - 485
See also references of EP 4180546A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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