Invention Grant
- Patent Title: High-strength cold-rolled steel sheet and method for manufacturing the same
-
Application No.: US15535175Application Date: 2015-10-27
-
Publication No.: US10590504B2Publication Date: 2020-03-17
- Inventor: Katsutoshi Takashima , Kohei Hasegawa , Yoshimasa Funakawa
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2014-251449 20141212
- International Application: PCT/JP2015/005376 WO 20151027
- International Announcement: WO2016/092733 WO 20160616
- Main IPC: C21D9/46
- IPC: C21D9/46 ; C22C38/14 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/58 ; C21D8/04 ; C21D1/28 ; C22C38/18 ; C21D9/48 ; C21D6/00 ; C22C38/08 ; C22C38/12 ; C22C38/16 ; C22C38/28 ; C22C38/32 ; C22C38/38

Abstract:
A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 μm or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 μm or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 μm or less, in which a relational expression, 0.35≤V2/V1≤0.75 (1), is satisfied, where V1 is a volume fraction of phases which are different from ferrite and V2 is a volume fraction of tempered martensite.
Public/Granted literature
- US20170321297A1 HIGH-STRENGTH COLD-ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME Public/Granted day:2017-11-09
Information query