EP 3239331 A1 20171101 - HIGH-STRENGTH STEEL HAVING SUPERIOR BRITTLE CRACK ARRESTABILITY, AND PRODUCTION METHOD THEREFOR
Title (en)
HIGH-STRENGTH STEEL HAVING SUPERIOR BRITTLE CRACK ARRESTABILITY, AND PRODUCTION METHOD THEREFOR
Title (de)
HOCHFESTER STAHL MIT HERVORRAGENDER SPRÖDBRUCHSTABLITÄT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER À HAUTE RÉSISTANCE AYANT UNE EXCELLENTE RÉSISTANCE À LA PROPAGATION DE FISSURES FRAGILES ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- KR 20140189132 A 20141224
- KR 2015014054 W 20151221
Abstract (en)
The present invention provides high-strength steel having superior brittle crack arrestability and a production method therefor. Provided according to the present invention are: high-strength steel, which has superior brittle crack arrestability, comprises 0.05-0.1 wt% of C, 0.9-1.5 wt% of Mn, 0.8-1.5 wt% of Ni, 0.005-0.1 wt% of Nb, 0.005-0.1 wt% of Ti, 0.1-0.6 wt% of Cu, 0.1-0.4 wt% of Si, at most 100 ppm of P, and at most 40 ppm of S with the remainder being Fe and other inevitable impurities, and has microstructures including one structure selected from the group consisting of a single-phase structure of ferrite, a single-phase structure of bainite, a complex-phase structure of ferrite and bainite, a complex-phase structure of ferrite and pearlite, and a complex-phase structure of ferrite, bainite, and pearlite; and a production method therefor. According to the present invention, high-strength steel having high yield strength and superior brittle crack arrestability can be obtained.
IPC 8 full level
C22C 38/04 (2006.01); C21D 8/00 (2006.01); C22C 38/02 (2006.01); C22C 38/08 (2006.01)
CPC (source: CN EP US)
B21C 37/02 (2013.01 - CN); C21D 6/001 (2013.01 - US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/0205 (2013.01 - EP US); C21D 8/021 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0247 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - CN EP US); C22C 38/08 (2013.01 - CN EP US); C22C 38/12 (2013.01 - CN EP US); C22C 38/14 (2013.01 - CN EP US); C22C 38/16 (2013.01 - CN EP US); C21D 8/0263 (2013.01 - EP US); C21D 2201/05 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US); C21D 2211/009 (2013.01 - EP US)
Designated contracting state (EPC)
AL 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 RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3239331 A1 20171101; EP 3239331 A4 20171108; EP 3239331 B1 20201028; CN 107109597 A 20170829; CN 107109597 B 20200131; JP 2018503744 A 20180208; JP 6788589 B2 20201125; KR 101746999 B1 20170615; KR 20160078926 A 20160705; US 2017327922 A1 20171116; WO 2016105062 A1 20160630; WO 2016105062 A8 20161124
DOCDB simple family (application)
EP 15873589 A 20151221; CN 201580070867 A 20151221; JP 2017532655 A 20151221; KR 2015014054 W 20151221; KR 20150186724 A 20151224; US 201515535582 A 20151221