EP 3633060 B1 20211229 - STEEL PLATE AND METHOD OF MANUFACTURING THE SAME
Title (en)
STEEL PLATE AND METHOD OF MANUFACTURING THE SAME
Title (de)
STAHLPLATTE UND VERFAHREN ZUR HERSTELLUNG DERSELBEN
Title (fr)
PLAQUE D'ACIER ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
JP 2018030676 W 20180820
Abstract (en)
[origin: EP3633060A1] A steel plate according to an aspect of the present invention has a chemical composition within a predetermined range, in which a total area ratio of martensite and bainite in a thickness middle portion is 99% or more, an average value of a prior austenite grain size in the thickness middle portion is less than 80 µm, Ceq is 0.750% to 0.800%, Al × N is 2.0 × 10<sup>-4</sup>or more, Ti/N is 3.4 or less, 4 × f/g ≥ 9.00 is satisfied, a three-point average of C-direction Charpy at -20°C in the thickness middle portion is 47 J or more, hardnesses of a surface layer and the thickness middle portion are 350 or more by HB, and a plate thickness is more than 200 mm.
IPC 8 full level
C21D 1/02 (2006.01); C21D 1/18 (2006.01); C21D 8/02 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01); C22C 38/18 (2006.01); C22C 38/22 (2006.01); C22C 38/40 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01)
CPC (source: EP KR)
C21D 1/02 (2013.01 - EP); C21D 1/18 (2013.01 - EP); C21D 8/02 (2013.01 - EP); C21D 8/0226 (2013.01 - EP KR); C21D 8/0263 (2013.01 - KR); C21D 8/0273 (2013.01 - KR); C22C 38/001 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/18 (2013.01 - EP); C22C 38/40 (2013.01 - EP); C22C 38/42 (2013.01 - KR); C22C 38/44 (2013.01 - KR); C22C 38/46 (2013.01 - KR); C22C 38/54 (2013.01 - EP)
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 3633060 A1 20200408; EP 3633060 A4 20200506; EP 3633060 B1 20211229; AU 2018430608 A1 20200305; AU 2018430608 B2 20210204; CN 111083928 A 20200428; CN 111083928 B 20201120; JP 6493645 B1 20190403; JP WO2020039485 A1 20200827; KR 102115277 B1 20200526; KR 20200022387 A 20200303; WO 2020039485 A1 20200227
DOCDB simple family (application)
EP 18922100 A 20180820; AU 2018430608 A 20180820; CN 201880041321 A 20180820; JP 2018030676 W 20180820; JP 2018562695 A 20180820; KR 20197037386 A 20180820