EP 3138936 B1 20200101 - HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR
Title (en)
HIGH-STRENGTH STEEL SHEET AND PRODUCTION METHOD THEREFOR
Title (de)
HOCHFESTES STAHLBLECH UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
TÔLE D'ACIER À HAUTE RÉSISTANCE ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- JP 2014094026 A 20140430
- JP 2015002176 W 20150422
Abstract (en)
[origin: EP3138936A1] The invention provides high-strength steel sheets having good formability (workability) and strength and methods for manufacturing such steel sheets. The high-strength steel sheet has a chemical composition including, in mass%, C: 0.010% to 0.080%, Si: 0.05% or less, Mn: 0.10% to 0.70%, P: 0.03% or less, S: 0.020% or less, Al: 0.005% to 0.070% and N: 0.0120% to 0.0180%, the balance being Fe and inevitable impurities, nitrogen present as solute nitrogen having a content of 0.0100% or more in the N content, the average ferrite grain size being 7.0 µm or less, the density of dislocations at a depth of 1/4 sheet thickness from the surface being 4.0 × 10 14 m -2 to 2.0 × 10 15 m -2 , the tensile strength and the elongation in the transverse direction perpendicular to the rolling direction after aging treatment being 530 MPa or more and 7% or more.
IPC 8 full level
C22C 38/06 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01)
CPC (source: EP KR US)
C21D 8/02 (2013.01 - EP KR US); C21D 8/0226 (2013.01 - EP KR US); C21D 8/0236 (2013.01 - EP KR US); C21D 8/0263 (2013.01 - EP KR US); C21D 8/0268 (2013.01 - EP KR US); C21D 9/46 (2013.01 - EP KR US); C22C 38/001 (2013.01 - EP KR US); C22C 38/002 (2013.01 - EP US); C22C 38/02 (2013.01 - EP KR US); C22C 38/04 (2013.01 - EP KR US); C22C 38/06 (2013.01 - EP KR US); C21D 2211/005 (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
DOCDB simple family (publication)
EP 3138936 A1 20170308; EP 3138936 A4 20170517; EP 3138936 B1 20200101; AU 2015254783 A1 20160929; AU 2015254783 B2 20180215; BR 112016025118 A2 20170815; BR 112016025118 B1 20210217; CN 106460125 A 20170222; CN 106460125 B 20191108; CN 110699600 A 20200117; CN 110699600 B 20211207; JP 5907315 B1 20160426; JP WO2015166646 A1 20170420; KR 101748689 B1 20170619; KR 20160096211 A 20160812; MX 2016014060 A 20170214; MY 191191 A 20220607; PH 12016501833 A1 20170109; PH 12016501833 B1 20170109; TW 201546296 A 20151216; TW I545203 B 20160811; US 2017051377 A1 20170223; WO 2015166646 A1 20151105
DOCDB simple family (application)
EP 15786615 A 20150422; AU 2015254783 A 20150422; BR 112016025118 A 20150422; CN 201580023594 A 20150422; CN 201910957192 A 20150422; JP 2015002176 W 20150422; JP 2015543606 A 20150422; KR 20167020566 A 20150422; MX 2016014060 A 20150422; MY PI2016703905 A 20150422; PH 12016501833 A 20160920; TW 104113524 A 20150428; US 201515307892 A 20150422