EP 2987887 A1 20160224 - HIGH STRENGTH HOT ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Title (en)
HIGH STRENGTH HOT ROLLED STEEL SHEET AND METHOD FOR PRODUCING SAME
Title (de)
HOCHFESTES HEISSGEWALZTES STAHLBLECH UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
TÔLE D'ACIER À HAUTE RÉSISTANCE MÉCANIQUE LAMINÉE À CHAUD ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2013084448 A 20130415
- JP 2013084450 A 20130415
- JP 2014001509 W 20140317
Abstract (en)
A high strength hot rolled steel sheet having a tensile strength TS of 980 MPa or more, has a composition containing, on a percent by mass basis, C: 0.05% or more and 0.18% or less, Si: 1.0% or less, Mn: 1.0% or more and 3.5% or less, P: 0.04% or less, S: 0.006% or less, Al: 0.10% or less, N: 0.008% or less, Ti: 0.05% or more and 0.20% or less, V: more than 0.1% and 0.3% or less, and the balance being Fe and incidental impurities, and has a microstructure comprising a primary phase and a secondary phase, the primary phase being a bainite phase having an area fraction of more than 85%, the secondary phase being at least one of ferrite phase, martensite phase, and retained austenite phase, the secondary phase having an area fraction of 0% or more and less than 15% in total,the bainite phase having an average lath interval of laths of 400 nm or less, and the laths having an average long axis length of 5.0 µm or less.
IPC 8 full level
B21B 1/22 (2006.01); B21B 3/00 (2006.01); C21D 1/25 (2006.01); C21D 1/84 (2006.01); C21D 6/00 (2006.01); C21D 7/13 (2006.01); C21D 8/02 (2006.01); C21D 8/04 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP US)
B21B 1/22 (2013.01 - EP US); C21D 1/02 (2013.01 - EP US); C21D 1/84 (2013.01 - US); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 6/008 (2013.01 - EP US); C21D 7/13 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0263 (2013.01 - EP US); C21D 8/0426 (2013.01 - EP US); C21D 8/0463 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - 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 38/12 (2013.01 - EP US); C22C 38/14 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); B21B 2001/225 (2013.01 - EP US); C21D 2211/002 (2013.01 - EP US); C21D 2211/003 (2013.01 - EP US); C22C 38/16 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/50 (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 2987887 A1 20160224; EP 2987887 A4 20160914; EP 2987887 B1 20190911; CN 105102662 A 20151125; KR 20160041850 A 20160418; MX 2015014437 A 20160203; MX 2020003923 A 20200813; US 2016076124 A1 20160317; WO 2014171063 A1 20141023
DOCDB simple family (application)
EP 14785555 A 20140317; CN 201480020707 A 20140317; JP 2014001509 W 20140317; KR 20157031660 A 20140317; MX 2015014437 A 20140317; MX 2020003923 A 20151014; US 201414784455 A 20140317