Global Patent Index - EP 3492610 A1

EP 3492610 A1 20190605 - HIGH-STRENGTH STEEL SHEET

Title (en)

HIGH-STRENGTH STEEL SHEET

Title (de)

ULTRAHOCHFESTES STAHLBLECH

Title (fr)

TÔLE D'ACIER À HAUTE RÉSISTANCE

Publication

EP 3492610 A1 (EN)

Application

EP 16910563 A

Priority

JP 2016072316 W

Abstract (en)

A high strength steel plate has a predetermined chemical composition, and in this high strength steel plate, DI is 2.0 to 7.8, Pcm is 0.189% or greater, a microstructure includes one or both of martensite and bainite such that a total area fraction thereof is 99% or greater, prior austenite grains have an aspect ratio of 2.0 or greater, a number fraction of cementite having a length of 1.0 µm or greater in a long axis direction with respect to cementite having a length of 0.1 µm or greater in the long axis direction is 5% or less, a plate thickness is 4.5 mm to 20 mm, a yield strength is 885 MPa or greater, a tensile strength is 950 MPa or greater, a total elongation is 12% or greater, and a Charpy absorbed energy at -20°C is 59 J/cm.

IPC 8 full level

C22C 38/00 (2006.01); C21D 8/02 (2006.01); C22C 38/14 (2006.01); C22C 38/58 (2006.01)

CPC (source: EP KR)

C21D 1/02 (2013.01 - EP); C21D 1/60 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/001 (2013.01 - EP KR); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP KR); C22C 38/02 (2013.01 - EP KR); C22C 38/04 (2013.01 - EP KR); C22C 38/06 (2013.01 - EP); C22C 38/08 (2013.01 - KR); C22C 38/12 (2013.01 - EP KR); C22C 38/14 (2013.01 - EP KR); C22C 38/16 (2013.01 - KR); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/24 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/38 (2013.01 - EP); C22C 38/40 (2013.01 - EP); C21D 2211/002 (2013.01 - EP KR); C21D 2211/003 (2013.01 - EP); C21D 2211/008 (2013.01 - EP KR)

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 3492610 A1 20190605; EP 3492610 A4 20200311; BR 112018071948 A2 20190205; CN 109154041 A 20190104; CN 109154041 B 20200731; JP 6501042 B2 20190417; JP WO2018020660 A1 20190228; KR 102142472 B1 20200807; KR 20180126591 A 20181127; WO 2018020660 A1 20180201

DOCDB simple family (application)

EP 16910563 A 20160729; BR 112018071948 A 20160729; CN 201680085629 A 20160729; JP 2016072316 W 20160729; JP 2018530300 A 20160729; KR 20187032277 A 20160729