Title:
塗装焼付け後の耐時効性に優れた歪時効硬化型鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP5073870
Kind Code:
B2
Abstract:
A strain aging hardening type steel sheet excellent in aging resistance, and manufacturing method thereof, said steel sheet comprises: in mass %, C: 0.0010 to 0.010%; Si: 0.005 to 1.0%; Mn: 0.08 to 1.0%; P: 0.003 to 0.10%; S: 0.0005 to 0.020%; Al: 0.010 to 0.10%; Cr: 0.005 to 0.20%; Mo: 0.005 to 0.20%; Ti: 0.002 to 0.10%; Nb: 0.002 to 0.10%; N: 0.001 to 0.005%; and a balance being composed of Fe and inevitable impurities, in which a ferrite fraction is 98% or more, an average grain diameter of ferrite is 5 to 30 μm, a minimum value of dislocation density in a portion having a ½ thickness of a sheet thickness and a minimum value of dislocation density in a surface layer portion are each 5×1012/m2 or more, and an average dislocation density falls within a range of 5×1012 to 1×1015/m2.
More Like This:
Inventors:
Naoki Maruyama
Koji Hashimoto
Masaharu Kameda
Koji Hashimoto
Masaharu Kameda
Application Number:
JP2012502797A
Publication Date:
November 14, 2012
Filing Date:
June 22, 2011
Export Citation:
Assignee:
Nippon Steel Corporation
International Classes:
C22C38/00; C21D9/46; C22C38/28; C22C38/54
Domestic Patent References:
| JP2002235117A | 2002-08-23 | |||
| JP2008110387A | 2008-05-15 | |||
| JP2009102673A | 2009-05-14 | |||
| JP2007077511A | 2007-03-29 | |||
| JP2002235117A | 2002-08-23 | |||
| JP2008110387A | 2008-05-15 | |||
| JP2009102673A | 2009-05-14 | |||
| JP2007077511A | 2007-03-29 |
Other References:
JPN6009033505; 社団法人日本鉄鋼協会 共同研究会鋼板部会コールドストリップ分科会: わが国における最近のコールドストリップ設備および製造技術の進歩 , 19770820, 第１４８頁, 社団法人日本鉄鋼協会
Attorney, Agent or Firm:
Koji Hagiwara
Tetsuo Kanamoto
Miaki Kametani
Tetsuo Kanamoto
Miaki Kametani