EP 2799575 A4 20151028 - HOT ROLLED HIGH TENSILE STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Title (en)
HOT ROLLED HIGH TENSILE STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Title (de)
WARMGEWALZTES HOCHFESTES STAHLBLECH UND DESSEN HERSTELLUNGSVERFAHREN
Title (fr)
FEUILLE D'ACIER LAMINÉE À CHAUD À HAUTE RÉSISTANCE ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- JP 2011285906 A 20111227
- JP 2012008211 W 20121221
Abstract (en)
[origin: EP2799575A1] The present invention provides a hot rolled high tensile strength steel sheet that exhibits excellent deformation characteristics after formed into pipes or tubes, without suffering local buckling when deformed by bending as steel pipes or tubes, and thus is suitable for making line pipes and oil well pipes or tubes. The steel sheet has a chemical composition containing, by mass%, C: 0.04-0.08 %, Si: 0.50 % or less, Mn: 0.8-2.2 %, P: 0.02 % or less, S: 0.006 % or less, Al: 0.1 % or less, N: 0.008 % or less, and Cr: 0.05-0.8 %, and further Nb: 0.01-0.08 %, V: 0.001-0.12 %, and Ti: 0.005-0.04 % in adjusted amounts, with the balance including Fe and incidental impurities. The steel sheet has a surface layer having a microstructure containing bainite as a main phase, martensite as a second phase in a volume fraction of 0.5-4 %, and at lease one of ferrite phase, pearlite, and cementite as a third phase in a total volume fraction of 10 % or less.
IPC 8 full level
C21D 8/02 (2006.01); C21D 8/10 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/38 (2006.01)
CPC (source: EP KR US)
B21B 1/00 (2013.01 - EP US); C21D 8/02 (2013.01 - KR); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/105 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/24 (2013.01 - EP US); C22C 38/26 (2013.01 - EP US); C22C 38/28 (2013.01 - EP US); C22C 38/32 (2013.01 - EP US); C22C 38/38 (2013.01 - EP KR US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/48 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/58 (2013.01 - EP KR); C21D 8/02 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/003 (2013.01 - US); C21D 2211/005 (2013.01 - US); C21D 2211/008 (2013.01 - EP US); C21D 2211/009 (2013.01 - US)
Citation (search report)
- [XI] JP 2011017061 A 20110127 - JFE STEEL CORP
- [XA] WO 2011065582 A1 20110603 - JFE STEEL CORP [JP], et al & US 2013000793 A1 20130103 - ISHIKAWA NOBUYUKI [JP], et al
- [XA] EP 1860204 A1 20071128 - SUMITOMO METAL IND [JP]
- [A] US 2009025835 A1 20090129 - HARA TAKUYA [JP], et al
- [E] EP 2735622 A1 20140528 - JFE STEEL CORP [JP]
- See references of WO 2013099192A1
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
DOCDB simple family (publication)
EP 2799575 A1 20141105; EP 2799575 A4 20151028; EP 2799575 B1 20161221; CN 104011245 A 20140827; CN 104011245 B 20170301; IN 1252KON2014 A 20151016; JP 5812115 B2 20151111; JP WO2013099192 A1 20150430; KR 101664635 B1 20161010; KR 20140099321 A 20140811; US 2014352852 A1 20141204; WO 2013099192 A1 20130704; WO 2013099192 A8 20140626
DOCDB simple family (application)
EP 12863451 A 20121221; CN 201280065034 A 20121221; IN 1252KON2014 A 20140610; JP 2012008211 W 20121221; JP 2013551228 A 20121221; KR 20147018457 A 20121221; US 201214368857 A 20121221