METHOD FOR MANUFACTURING STEEL PLATE AND STEEL PIPE FOR ULTRAHIGH-STRENGTH LINE PIPE

WIPO Patent Application WO/2010/052926

A1

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, 0.0005-0.03% Al, 0.003-0.030% Ti, less than 0.0003% B, 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; water cooling to a prescribed temperature higher than the MS point is performed, after which a heat-recovery process is repeated at least one or more times to cool the surface of the aforementioned steel plate; and a final water-cooling is performed to cool the surface of the aforementioned steel plate to a temperature that is at or below the MS point.

HARA TAKUYA (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)

PCT/JP2009/005929

May 14, 2010

November 06, 2009

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NIPPON STEEL CORP (JP)
HARA TAKUYA (JP)
FUJISHIRO TAISHI (JP)
TERADA YOSHIO (JP)
SHINOHARA YASUHIRO (JP)
SHIMIZU ATSUSHI (JP)
UCHIDA YUU (JP)

C21D8/02; B21B3/00; B21C37/08; C21D8/10; C21D9/08; C21D9/50; C22C38/00; C22C38/14; C22C38/58

JP2005240176A	2005-09-08
JP2003277829A	2003-10-02
JP2003321727A	2003-11-14
JP2004010971A	2004-01-15
JPH07284836A	1995-10-31
JP2008163456A	2008-07-17
JP2009084598A	2009-04-23

SHIGA, Masatake et al. (JP)
Masatake Shiga (JP)

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