FIRE-RESISTANT HIGH-STRENGTH ROLLED STEEL MATERIAL AND METHOD FOR PRODUCTION THEREOF

Title:

FIRE-RESISTANT HIGH-STRENGTH ROLLED STEEL MATERIAL AND METHOD FOR PRODUCTION THEREOF

Document Type and Number:

WIPO Patent Application WO/2007/091725

Kind Code:

A1

Abstract:

Disclosed is a fire-resistant high-strength rolled steel material which has excellent fire resistance and toughness and can be used as a structural member for a building structure. The material comprises the following components (by mass): C: not less than 0.005% and less than 0.04%; Mn: 0.8-1.7%; Si: not less than 0.05% and less than 0.4%; Nb: 0.02-1%; Ti: 0.005-0.02%; N: not less than 0.005%; B: 0.0003-0.003%; and Al: 0.005-0.03%, and has the Ti/N ratio of 2 to 8 (mass%) and the C-Nb/7.74 value of 0.02% or less, wherein the remainder is Fe and unavoidable impurities. The material has the ratio of the 0.2% proof stress at 600˚C to the yield strength at room temperature of 0.50 or greater.

Inventors:

OKUMURA TERUHISA (JP)
KITA HIROSHI (JP)
YAMAMOTO KOHICHI (JP)
YOSHIDA SUGURU (JP)

Application Number:

PCT/JP2007/052658

Publication Date:

August 16, 2007

Filing Date:

February 08, 2007

Export Citation:

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Assignee:

NIPPON STEEL CORP (JP)
OKUMURA TERUHISA (JP)
KITA HIROSHI (JP)
YAMAMOTO KOHICHI (JP)
YOSHIDA SUGURU (JP)

International Classes:

C22C38/00; B21B3/00; C21D8/00; C22C38/14; C22C38/58

Foreign References:

JP2000248335A	2000-09-12
JP2000282167A	2000-10-10
JPH07286233A	1995-10-31
JP2004360361A	2004-12-24
JP2005194869A	2005-07-21
JP2005272949A	2005-10-06

Other References: