Title:
成形性に優れた高強度溶融亜鉛めっき鋼板およびその製造方法
Document Type and Number:
Japanese Patent JP5709151
Kind Code:
B2
Abstract:
A high-strength galvanized steel sheet having excellent formability that has a TS of 780 MPa or more and is excellent in terms of ductility, stretch flangeability, and bendability; and a method for manufacturing the high-strength galvanized steel sheet are provided. The high-strength galvanized steel sheet having excellent formability has a component composition containing, on the basis of mass percent, 0.05 to 0.2% C, 0.5 to 2.5% Si, 1.5 to 3.0% Mn, 0.001 to 0.05% P, 0.0001 to 0.01% S, 0.001 to 0.1% Al, and 0.0005 to 0.01% N, the balance being Fe and incidental impurities; and the steel sheet has a microstructure including a ferritic phase and a martensitic phase including a tempered-martensitic phase, the ferritic phase having an area fraction of 30% or more relative to an entirety of the microstructure, the martensitic phase having an area fraction of 30 to 50% relative to the entirety of the microstructure, and the tempered-martensitic phase having an area fraction of 70% or more relative to an entirety of the martensitic phase.
Inventors:
Shinjiro Kaneko
Kawasaki
Tatsuya Nakagaichi
Saiji Matsuoka
Kawasaki
Tatsuya Nakagaichi
Saiji Matsuoka
Application Number:
JP2009055857A
Publication Date:
April 30, 2015
Filing Date:
March 10, 2009
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/06; C22C38/58; C23C2/02; C23C2/06
Domestic Patent References:
| JP2003171735A | ||||
| JP2007009269A | ||||
| JP2004218025A |
Attorney, Agent or Firm:
Shigeru Inoue
Yosuke Kobayashi
Yosuke Kobayashi