EP 3556892 A4 20191023 - LOW ALLOY STEEL SHEET HAVING EXCELLENT STRENGTH AND DUCTILITY
Title (en)
LOW ALLOY STEEL SHEET HAVING EXCELLENT STRENGTH AND DUCTILITY
Title (de)
NIEDRIGLEGIERTES STAHLBLECH MIT HERVORRAGENDER FESTIGKEIT UND DUKTILITÄT
Title (fr)
TÔLE D'ACIER FAIBLEMENT ALLIÉ AYANT UNE RÉSISTANCE ET UNE DUCTILITÉ EXCELLENTES
Publication
Application
Priority
- KR 20160169693 A 20161213
- KR 2017005381 W 20170524
Abstract (en)
[origin: EP3556892A1] The present invention minimizes the addition of alloying elements to reduce surface cracking during hot rolling, ensures corrosion resistance by constituting Cr as one of the main components, and realizes a TRIP or TWIP phenomenon through a high Mn design, thereby providing a low alloy steel sheet with excellent hot workability, strength and ductility. The low alloy steel sheet excellent in strength and ductility according to an embodiment of the present invention comprises, in percent (%) by weight of the entire composition, 0.05 to 0.3 % of carbon (C), 0.7 to 2.5 % of silicon (Si), 8 to 12 % of manganese (Mn), 13 to 15.5 % of chromium (Cr), 0.5 to 3.0 % of copper (Cu), 0.1 to 0.2 % of nitrogen (N), 0.25 % or less of aluminum (Al), 0.25 % or less of tin (Sn), and the remainder of iron (Fe) and other inevitable impurities. The microstructure of the low alloy steel sheet comprises at least one of a ferrite phase and a martensite phase at a volume fraction of 5% or less, and the remainder includes an austenite phase.
IPC 8 full level
C22C 38/02 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/34 (2006.01); C22C 38/38 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/58 (2006.01); C22C 38/60 (2006.01)
CPC (source: EP KR US)
C22C 38/001 (2013.01 - US); C22C 38/008 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - US); C22C 38/06 (2013.01 - US); C22C 38/20 (2013.01 - EP KR US); C22C 38/22 (2013.01 - EP KR US); C22C 38/34 (2013.01 - EP KR); C22C 38/38 (2013.01 - EP KR); C22C 38/42 (2013.01 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/58 (2013.01 - EP KR); C22C 38/60 (2013.01 - KR); C21D 8/0226 (2013.01 - US); C21D 2211/001 (2013.01 - KR US); C21D 2211/005 (2013.01 - KR US); C21D 2211/008 (2013.01 - US)
Citation (search report)
- [X] WO 2016027009 A1 20160225 - OUTOKUMPU OY [FI]
- [XI] JP H032357 A 19910108 - NIPPON METAL IND
- [X] JP 2011202237 A 20111013 - NIPPON STEEL & SUMIKIN SST
- [XI] JP 2009030128 A 20090212 - NIPPON STEEL & SUMIKIN SST
- [A] WO 2013133259 A1 20130912 - NIPPON STEEL & SUMIKIN SST [JP]
- [A] JP 2012126992 A 20120705 - JFE STEEL CORP
- See references of WO 2018110779A1
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 3556892 A1 20191023; EP 3556892 A4 20191023; CN 110062814 A 20190726; JP 2020509175 A 20200326; KR 101903174 B1 20181001; KR 20180068088 A 20180621; US 2020080178 A1 20200312; WO 2018110779 A1 20180621
DOCDB simple family (application)
EP 17881659 A 20170524; CN 201780076526 A 20170524; JP 2019531716 A 20170524; KR 20160169693 A 20161213; KR 2017005381 W 20170524; US 201716468875 A 20170524