Invention Grant
- Patent Title: High strength cold rolled steel sheet and method for manufacturing the same
- Patent Title (中): 高强度冷轧钢板及其制造方法
-
Application No.: US14058580Application Date: 2013-10-21
-
Publication No.: US09534269B2Publication Date: 2017-01-03
- Inventor: Yoshihiko Ono , Kenji Takahashi , Kaneharu Okuda , Shoichiro Taira , Michitaka Sakurai , Yusuke Fushiwaki
- Applicant: JFE Steel Corporation
- Applicant Address: JP
- Assignee: JFE Steel Corporation
- Current Assignee: JFE Steel Corporation
- Current Assignee Address: JP
- Agency: DLA Piper LLP (US)
- Priority: JP2009-174846 20090728
- Main IPC: C21D8/02
- IPC: C21D8/02 ; C22C38/04 ; C22C38/06 ; C22C38/58

Abstract:
A method of manufacturing a high strength cold rolled steel sheet includes hot-rolling and cold-rolling a steel slab annealing the steel sheet at an annealing temperature of 750° C. to 830° C.; subjecting the steel sheet to first cooling at an average cooling rate of 3° C./sec to 40° C./sec in a temperature range from the annealing temperature to 480° C.; subjecting the steel sheet to second cooling at an average cooling rate of 8° C./sec to 80° C./sec in a temperature range from 480° C. to Tc (° C.) given by formula (6): Tc=435−40×[% Mn]−30×[% Cr]−30×[% V] (6) wherein [% A] is the content (% by mass) of alloying element A; and subjecting the steel sheet to third cooling at an average cooling rate of 0.3° C./sec to 30° C./sec in a temperature range from Tc (° C.) to 200° C.
Public/Granted literature
- US20140102596A1 HIGH STRENGTH COLD ROLLED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME Public/Granted day:2014-04-17
Information query