EP 4092149 A4 20230503 - STEEL SHEET AND STEEL PIPE
Title (en)
STEEL SHEET AND STEEL PIPE
Title (de)
STAHLBLECH UND STAHLROHR
Title (fr)
TÔLE D'ACIER ET TUYAU EN ACIER
Publication
Application
Priority
JP 2020001478 W 20200117
Abstract (en)
[origin: EP4092149A1] This steel plate has a predetermined chemical composition, a metallographic structure in a thickness middle portion includes, by area%, 0% to 80% of polygonal ferrite and one or two selected from acicular ferrite and bainite, a remainder is an M-A phase, and an effective grain size is 15.0 µm or less, a metallographic structure in a surface layer that is a range of 1.0 mm in a thickness direction from a surface includes, by area%, a total of 95% or more of one or two selected from acicular ferrite and bainite, and a remainder is an M-A phase, and a maximum hardness in the surface layer is 250 HV0.1 or less.
IPC 8 full level
C22C 38/00 (2006.01); C21D 1/78 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR)
C21D 1/78 (2013.01 - EP); C22C 38/001 (2013.01 - KR); C22C 38/002 (2013.01 - EP); C22C 38/005 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/04 (2013.01 - EP); C22C 38/12 (2013.01 - EP); C22C 38/14 (2013.01 - EP); C22C 38/16 (2013.01 - EP); C22C 38/20 (2013.01 - EP); C22C 38/22 (2013.01 - EP); C22C 38/26 (2013.01 - EP); C22C 38/28 (2013.01 - EP); C22C 38/32 (2013.01 - EP); C22C 38/42 (2013.01 - EP KR); C22C 38/44 (2013.01 - EP KR); C22C 38/58 (2013.01 - KR); C21D 1/02 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 8/105 (2013.01 - EP); C21D 9/08 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C21D 9/50 (2013.01 - EP); C21D 2211/002 (2013.01 - EP KR); C21D 2211/005 (2013.01 - EP KR); C21D 2221/10 (2013.01 - EP)
Citation (search report)
- [X] JP 6344538 B1 20180620
- [X] JP 6587041 B1 20191009
- [A] EP 3042976 A1 20160713 - NIPPON STEEL & SUMITOMO METAL CORP [JP]
- [A] ZHANG JIMING ET AL: "Formation mechanism of nanoscale transformation twinning in ultra-low-carbon high-strength pipeline steels", JOURNAL OF MATERIAL SCIENCE, KLUWER ACADEMIC PUBLISHERS, DORDRECHT, vol. 54, no. 24, 22 August 2019 (2019-08-22), pages 14950 - 14960, XP036891892, ISSN: 0022-2461, [retrieved on 20190822], DOI: 10.1007/S10853-019-03930-W
- See also references of WO 2021144953A1
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 4092149 A1 20221123; EP 4092149 A4 20230503; BR 112022008897 A2 20220823; CN 114846163 A 20220802; CN 114846163 B 20231024; JP 7295470 B2 20230621; JP WO2021144953 A1 20210722; KR 20220098786 A 20220712; WO 2021144953 A1 20210722
DOCDB simple family (application)
EP 20914216 A 20200117; BR 112022008897 A 20200117; CN 202080088409 A 20200117; JP 2020001478 W 20200117; JP 2021570595 A 20200117; KR 20227020090 A 20200117