Title:
METHOD FOR MANUFACTURING STEEL PLATE AND STEEL PIPE FOR ULTRAHIGH-STRENGTH LINE PIPE
Document Type and Number:
WIPO Patent Application WO/2010/052927
Kind Code:
A1
Abstract:
Disclosed is a method for manufacturing a steel plate for an ultrahigh-strength line pipe, whereby: steel comprised of 0.03-0.08% C, 0.01-0.50% Si, 1.5-2.5% Mn, 0.01% or less P, 0.0030% or less S, 0.0001-0.20% Nb, 0.0001-0.03% Al, 0.003-0.030% Ti, 0.0010-0.0050% N, 0.0050% or less O, in terms of mass%, with the remainder being iron and unavoidable impurities, is shaped into ingots; this steel is cast into billets; these billets are hot-rolled to form a steel plate; the surface of the steel plate is cooled until the surface temperature of the aforementioned steel plate is a prescribed temperature that is higher than 540°C, with a water quantity concentration of 0.6 m3/(m2 • min) or less; and then the surface of the aforementioned steel plate is cooled with a water quantity concentration of 1.3 m3/(m2 • min) or more.
Inventors:
HARA TAKUYA (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)
Application Number:
PCT/JP2009/005930
Publication Date:
May 14, 2010
Filing Date:
November 06, 2009
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
HARA TAKUYA (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)
HARA TAKUYA (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)
International Classes:
C21D8/02; B21B3/00; B21C37/08; C21D8/10; C21D9/08; C21D9/50; C22C38/00; C22C38/14; C22C38/58
Foreign References:
| JP2008261000A | 2008-10-30 | |||
| JP2008248291A | 2008-10-16 | |||
| JP2008163456A | 2008-07-17 | |||
| JP2009084598A | 2009-04-23 |
Attorney, Agent or Firm:
SHIGA, Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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