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1. (WO2009123292) HIGH-TENSILE STRENGTH STEEL AND MANUFACTURING METHOD THEREOF

Pub. No.:    WO/2009/123292    International Application No.:    PCT/JP2009/056906
Publication Date: Oct 8, 2009 International Filing Date: Mar 27, 2009
IPC: C22C 38/14
C22C 38/58
C21D 8/02
Applicants: JFE STEEL CORPORATION
JFEスチール株式会社
ICHIMIYA, Katsuyuki
一宮克行
YOKOTA, Tomoyuki
横田智之
NISHIMURA, Kimihiro
西村公宏
SHIKANAI, Nobuo
鹿内伸夫
Inventors: ICHIMIYA, Katsuyuki
一宮克行
YOKOTA, Tomoyuki
横田智之
NISHIMURA, Kimihiro
西村公宏
SHIKANAI, Nobuo
鹿内伸夫
Title: HIGH-TENSILE STRENGTH STEEL AND MANUFACTURING METHOD THEREOF
Abstract:
Disclosed are a high-tensile strength steel wherein the base material has excellent strength and ductility, as well as excellent ductility in welding heated parts, even in thick high-strength steel plates, and a manufacturing method thereof. More specifically, disclosed is a high-tensile strength steel comprising, in mass%, C: 0.03-0.10%, Si: 0.30% or less, Mn: 1.60-2.30%, P: 0.015% or less, S: 0.005% or less, Al: 0.005-0.06%, Nb: 0.004-0.05%, Ti: 0.005-0.02%, N: 0.001-0.005%, Ca: 0.0005-0.003%, as well as Ca, S, and O in the following formula (1): (1) wherein the content (mass%) of each element Ca, S, and O is satisfied, and the remainder of which comprises Fe and unavoidable impurities.