EP 2272994 A1 20110112 - HIGH-TENSILE STRENGTH STEEL AND MANUFACTURING METHOD THEREOF
Title (en)
HIGH-TENSILE STRENGTH STEEL AND MANUFACTURING METHOD THEREOF
Title (de)
STAHL MIT HOHER BRUCHFESTIGKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER AYANT UNE RÉSISTANCE À LA TRACTION ÉLEVÉE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2009056906 W 20090327
- JP 2008089648 A 20080331
Abstract (en)
Proposed are a high-tensile strength steel that is excellent in strength and toughness of the base material and also excellent in toughness of the weld heated zone, even if the steel has a large thick, and a method of advantageously manufacturing the steel. Specifically, the high-tensile strength steel has a component composition including, in mass%, C: 0.03 to 0.10%, Si: 0.30% or less, Mn: 1.60 to 2.30%, P: 0.015% or less, S: 0.005% or less, Al: 0.005 to 0.06%, Nb: 0.004 to 0.05%, Ti: 0.005 to 0.02%, N: 0.001 to 0.005%, Ca: 0.0005 to 0.003%, and the balance of Fe and inevitable impurities so that Ca, S, and O satisfy the following expression (1): 0 < Ca - 0.18 + 130 × Ca × 0 / 1.25 / S < 1 wherein, Ca, S, and O represent the respective contents (mass%) of the elements.
IPC 8 full level
C22C 38/14 (2006.01); C21D 8/02 (2006.01); C22C 38/58 (2006.01)
CPC (source: CN EP KR)
C21D 8/005 (2013.01 - KR); C21D 8/0226 (2013.01 - CN EP); C21D 8/0263 (2013.01 - EP); C22C 38/001 (2013.01 - CN EP KR); C22C 38/002 (2013.01 - CN EP KR); C22C 38/02 (2013.01 - CN EP KR); C22C 38/04 (2013.01 - CN EP KR); C22C 38/06 (2013.01 - CN EP KR); C22C 38/08 (2013.01 - CN); C22C 38/12 (2013.01 - CN EP KR); C22C 38/14 (2013.01 - CN EP KR); C22C 38/16 (2013.01 - CN); C22C 38/18 (2013.01 - CN); C22C 38/32 (2013.01 - CN); C22C 38/58 (2013.01 - KR); C22C 2202/00 (2013.01 - KR)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR
Designated extension state (EPC)
AL BA RS
DOCDB simple family (publication)
EP 2272994 A1 20110112; EP 2272994 A4 20140108; EP 2272994 B1 20141112; CN 102124133 A 20110713; CN 105821313 A 20160803; JP 2009263777 A 20091112; JP 5439887 B2 20140312; KR 20100116701 A 20101101; KR 20130035277 A 20130408; KR 20150094793 A 20150819; WO 2009123292 A1 20091008
DOCDB simple family (application)
EP 09726619 A 20090327; CN 200980111883 A 20090327; CN 201610206206 A 20090327; JP 2009056906 W 20090327; JP 2009073113 A 20090325; KR 20107021621 A 20090327; KR 20137005580 A 20090327; KR 20157021337 A 20090327