Title:
ラインパイプ用ホットコイル及びその製造方法
Document Type and Number:
Japanese Patent JP5339006
Kind Code:
B1
Abstract:
The present invention provides a hot coil for line pipe use which can reduce deviation in ordinary temperature strength and improve low temperature toughness despite the numerous restrictions in production conditions due to the coiling step and provides a method of production of the same, specifically makes the steel plate stop for a predetermined time between rolling passes in the recrystallization temperature range and performs cooling by two stages after hot rolling so as to thereby make the steel structure at the center part of plate thickness and effective crystal grain size of 3 to 10 µm, make the total of the area ratios of bainite and acicular ferrite 60 to 99%, and make the absolute value of A-B 0 to 30% when the totals of the area ratios of bainite and acicular ferrite at any two portions are designated as respectively A and B.
Inventors:
Takuya Hara
Ken Kinoshita
Kazuaki Tanaka
Ken Kinoshita
Kazuaki Tanaka
Application Number:
JP2013508326A
Publication Date:
November 13, 2013
Filing Date:
September 27, 2012
Export Citation:
Assignee:
Nippon Steel & Sumitomo Metal Corporation
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/14; C22C38/58
Domestic Patent References:
| JP2010196160A | 2010-09-09 | |||
| JP2007138290A | 2007-06-07 | |||
| JP2010196165A | 2010-09-09 | |||
| JP2010196156A | 2010-09-09 | |||
| JP2000313920A | 2000-11-14 | |||
| JPH0931544A | 1997-02-04 | |||
| JP2010196160A | 2010-09-09 | |||
| JP2007138290A | 2007-06-07 | |||
| JP2010196165A | 2010-09-09 | |||
| JP2010196156A | 2010-09-09 | |||
| JP2000313920A | 2000-11-14 | |||
| JPH0931544A | 1997-02-04 |
Attorney, Agent or Firm:
Atsushi Aoki
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu
Takashi Ishida
Tetsuji Koga
Hiroshi Kamematsu
Nakamura Asayuki
Nagasaka Tomoyasu