EP 3872217 A4 20210901 - CRYOGENIC AUSTENITIC HIGH MANGANESE STEEL HAVING EXCELLENT SURFACE QUALITY AND MANUFACTURING METHOD THEREFOR
Title (en)
CRYOGENIC AUSTENITIC HIGH MANGANESE STEEL HAVING EXCELLENT SURFACE QUALITY AND MANUFACTURING METHOD THEREFOR
Title (de)
KRYOGENER AUSTENITISCHER STAHL MIT HOHEM MANGANANTEIL MIT HERVORRAGENDER OBERFLÄCHENQUALITÄT UND VERFAHREN ZU SEINER HERSTELLUNG
Title (fr)
ACIER INOXYDABLE AUSTÉNITIQUE CRYOGÉNIQUE À HAUTE TENEUR EN MANGANÈSE PRÉSENTANT UNE EXCELLENTE QUALITÉ DE SURFACE ET PROCÉDÉ DE FABRICATION ASSOCIÉ
Publication
Application
Priority
- KR 20180128501 A 20181025
- KR 20190118927 A 20190926
- KR 2019014170 W 20191025
Abstract (en)
[origin: EP3872217A1] A cryogenic austenitic high manganese steel having excellent surface quality according to an aspect of the present invention comprises: in weight%, 0.4-0.5% of C; 23-26% of Mn; 0.03-0.5% of Si; 3-5% of Cr; 0.05% or less of Al; 0.05% or less of S; 0.5% or less of P; and 0.005% or less of B; and the balance being Fe and unavoidable impurities, and contains 95 area% or more of austenite as a microstructure, wherein under cross-sectional observation using a microscope, the number of surface flaws formed at a depth of 10 µm or more from the surface may be 0.0001 or less per unit area (mm 2 ) from among the surface flaws observed in an area from the surface to a t/8 (where t means product thickness (mm)) point.
IPC 8 full level
C22C 38/38 (2006.01); B21B 1/16 (2006.01); B21B 3/00 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C21D 9/46 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/32 (2006.01)
CPC (source: EP KR)
B21B 1/16 (2013.01 - KR); B21B 3/00 (2013.01 - KR); C21D 6/005 (2013.01 - EP); C21D 8/02 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0231 (2013.01 - EP); C21D 8/0236 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/00 (2013.01 - EP); C22C 38/02 (2013.01 - EP); C22C 38/06 (2013.01 - EP); C22C 38/20 (2013.01 - EP KR); C22C 38/32 (2013.01 - EP KR); C22C 38/38 (2013.01 - EP KR); C21D 1/02 (2013.01 - EP); C21D 2211/001 (2013.01 - EP KR)
Citation (search report)
- [X] CN 106222554 A 20161214 - NANJING IRON & STEEL CO LTD
- [A] KR 20180074450 A 20180703 - POSCO [KR]
- [A] CN 107177786 A 20170919 - UNIV NORTHEASTERN
- [A] CN 108570541 A 20180925 - UNIV NORTHEASTERN
- [A] JP S5623259 A 19810305 - SUMITOMO METAL IND
- [A] WO 2018117712 A1 20180628 - POSCO [KR]
- [A] WO 2017111510 A1 20170629 - POSCO [KR]
- See references of WO 2020085851A1
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 3872217 A1 20210901; EP 3872217 A4 20210901; CN 112888804 A 20210601; KR 102255827 B1 20210526; KR 20200047320 A 20200507
DOCDB simple family (application)
EP 19877327 A 20191025; CN 201980068253 A 20191025; KR 20190118927 A 20190926