Title:
溶融亜鉛めっき鋼板およびその製造方法
Document Type and Number:
Japanese Patent JP6589903
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a hot-dip galvanized steel sheet having improved warm formability.SOLUTION: A hot-dip galvanized steel sheet has a composition comprising, in mass%, C: 0.08-0.20%, Si: 0.5% or less, Mn: 0.8-1.8%, P: 0.10% or less, S: 0.030% or less, Al: 0.10% or less, and N: 0.010% or less and also comprising one or more of Ti: 0.01-0.3%, Nb: 0.01-0.1%, and V: 0.01-1.0% so as to satisfy the condition of (Ti/48+Nb/93+V/51)×12 of 0.07 or more, with the balance being Fe and inevitable impurities, and has a structure in which the total area ratio of a ferrite phase and a tempered bainite phase is 95% or more, an average particle size of the surface structure is 5.0 μm or less, an amount of Ti, Nb, V precipitated as precipitates with a particle size of less than 20 nm is 0.025 mass% or more in terms of a precipitated C corresponding amount, and an amount of solidified C on the surface layer is 0.005 mass% or more.SELECTED DRAWING: None
Inventors:
Taro Kizu
Eiaki Moriyasu
Shigeyuki Nabeshima
Kazunori Tahara
Kana Sasaki
Eiaki Moriyasu
Shigeyuki Nabeshima
Kazunori Tahara
Kana Sasaki
Application Number:
JP2017019277A
Publication Date:
October 16, 2019
Filing Date:
February 06, 2017
Export Citation:
Assignee:
jfe Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/14; C22C38/60
Domestic Patent References:
| JP2014208876A | ||||
| JP2011225978A | ||||
| JP2008189985A | ||||
| JP2007224408A | ||||
| JP2018127644A | ||||
| JP2006199979A | ||||
| JP2012188746A | ||||
| JP2015017322A | ||||
| JP2015147960A |
Foreign References:
| US20160199892 | ||||
| KR101630977B1 |
Attorney, Agent or Firm:
Isomura Tetsuro
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori
Akira Kumasaka
Tetsuya Sakai
Kazuhiro Mori