EP 3330394 B1 20200826 - HIGH_STRENGTH_ HOT_ROLLED STEEL SHEET
Title (en)
HIGH_STRENGTH_ HOT_ROLLED STEEL SHEET
Title (de)
HOCHFESTES WARMGEWALZTES STAHLBLECH
Title (fr)
TÔLE D'ACIER LAMINÉE À CHAUD À RÉSISTANCE ÉLEVÉE
Publication
Application
Priority
JP 2015071845 W 20150731
Abstract (en)
[origin: EP3330394A1] There is provided a high strength hot rolled steel sheet including a predetermined chemical composition. A structure includes, by area ratio, 80% or more of polygonal ferrite, a total of 5% or less of martensite and austenite, and a total of 5% or less of pearlite and cementite, and a remainder is at least one selected from bainitic ferrite and bainite. When a standard deviation of micro-hardness of 50 arbitrary pieces of the polygonal ferrite present within a range of ±100 µm from a central plane in a sheet thickness direction is ÃHV, the ÃHV is 30 or smaller. A grain of the polygonal ferrite contains 5×10 7 pieces/mm 2 or more of Ti-containing carbide, and in 50% or more of the Ti-containing carbide, the aspect ratio which is a ratio of a length of a long side to a length of a short side is less than 3. The tensile strength is 540 MPa or higher.
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/34 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01); C23C 2/06 (2006.01)
CPC (source: EP KR US)
C21D 8/0226 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/00 (2013.01 - EP US); C22C 38/002 (2013.01 - KR); C22C 38/02 (2013.01 - KR); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C22C 38/12 (2013.01 - KR); C22C 38/14 (2013.01 - KR); C22C 38/34 (2013.01 - EP 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 38/54 (2013.01 - EP US); C23C 2/06 (2013.01 - KR); C23C 2/40 (2013.01 - KR); C21D 2211/005 (2013.01 - EP KR US); C23C 2/06 (2013.01 - 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
DOCDB simple family (publication)
EP 3330394 A1 20180606; EP 3330394 A4 20181219; EP 3330394 B1 20200826; BR 112018000633 A2 20180918; CN 107849651 A 20180327; CN 107849651 B 20190903; JP 6485549 B2 20190320; JP WO2017022025 A1 20180531; KR 102079968 B1 20200221; KR 20180019736 A 20180226; MX 2018001140 A 20180420; US 2018209007 A1 20180726; WO 2017022025 A1 20170209
DOCDB simple family (application)
EP 15900339 A 20150731; BR 112018000633 A 20150731; CN 201580082015 A 20150731; JP 2015071845 W 20150731; JP 2017532259 A 20150731; KR 20187002148 A 20150731; MX 2018001140 A 20150731; US 201515744690 A 20150731