HIGH-STRENGTH STRUCTURAL STEEL SHEET EXCELLENT IN HOT RESISTANCE AND MANUFACTURING METHOD THEREOF

Title:

HIGH-STRENGTH STRUCTURAL STEEL SHEET EXCELLENT IN HOT RESISTANCE AND MANUFACTURING METHOD THEREOF

Document Type and Number:

WIPO Patent Application WO/2017/111443

Kind Code:

A1

Abstract:

The present invention relates to a high-strength structural steel sheet excellent in hot resistance, comprising in percentage by weight: 0.03 to 0.07% of C; 0.05 to 0.2% of Si; 1.6 to 2.3% of Mn; 0.008% or less of P; 0.002% of less of S; 0.025% of less of Al; 0.1 to 0.4% of Cu; 1.4 to 2.3% of Ni; 0.08 to 0.2% of Mo; 0.01 to 0.025% of Nb; 0.008 to 0.02% of Ti; 0.001 to 0.008% of N; and the remainder being Fe and unavoidable impurities, wherein a microstructure within 10 mm or less from a surface comprises, by volume fraction, 80% or more of acicular ferrite and 20% or less of polygonal ferrite.

Inventors:

KIM WOO-GYEOM (KR)
KIM HAN-KYU (KR)
KIM SANG-HO (KR)

Application Number:

PCT/KR2016/014964

Publication Date:

June 29, 2017

Filing Date:

December 21, 2016

Export Citation:

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Assignee:

POSCO (KR)

International Classes:

C22C38/16; C21D8/02; C22C38/00; C22C38/02; C22C38/04; C22C38/06; C22C38/08; C22C38/12; C22C38/14

Foreign References:

JPS63183123A	1988-07-28
JP2007056348A	2007-03-08
JPH11152540A	1999-06-08
JP2010121149A	2010-06-03
KR20110022308A	2011-03-07

Other References: