Title:
HIGH-STRENGTH STEEL SHEET AND MANUFACTURING METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/159771
Kind Code:
A1
Abstract:
Provided are: a high-strength steel sheet having excellent strength, workability in terms of λ and the like, and energy absorption characteristics; and a method for manufacturing same. This high-strength steel sheet has a specific component composition and a steel structure comprising, by area ratio, 1-35% of a ferrite having an aspect ratio of not less than 2.0, not more than 10% of a ferrite having an aspect ratio of less than 2.0, less than 5% of a non-recrystallized ferrite, 40-80% of bainite and a carbide-containing martensite in total, 5-35% of a fresh martensite and residual austenite in total, and 3-35% of residual austenite, wherein the carbon content in the residual austenite is 0.40-0.70 mass%.
Inventors:
HASEGAWA HIROSHI (JP)
NAKAGAITO TATSUYA (JP)
NAKAGAITO TATSUYA (JP)
Application Number:
PCT/JP2019/004148
Publication Date:
August 22, 2019
Filing Date:
February 06, 2019
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D9/46; C22C38/14; C22C38/60
Domestic Patent References:
| WO2016067625A1 | 2016-05-06 | |||
| WO2017138384A1 | 2017-08-17 |
Foreign References:
| JP2013185196A | 2013-09-19 | |||
| JP2017145469A | 2017-08-24 | |||
| JPS6123966B2 | 1986-06-09 | |||
| IB2014077294W |
Other References:
See also references of EP 3757242A4
Attorney, Agent or Firm:
KUMASAKA Akira et al. (JP)
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