EP 3239340 A4 20180725 - SUPER DUPLEX STAINLESS STEEL HAVING EXCELLENT YIELD STRENGTH AND IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR
Title (en)
SUPER DUPLEX STAINLESS STEEL HAVING EXCELLENT YIELD STRENGTH AND IMPACT TOUGHNESS AND MANUFACTURING METHOD THEREFOR
Title (de)
SUPERDUPLEXEDELSTAHL MIT HERVORRAGENDER STRECKGRENZE UND SCHLAGZÄHIGKEIT UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER INOXYDABLE SUPER DUPLEX PRÉSENTANT UNE EXCELLENTE LIMITE D'ÉLASTICITÉ ET RÉSISTANCE AUX CHOCS ET SON PROCÉDÉ DE FABRICATION
Publication
Application
Priority
- KR 20140191169 A 20141226
- KR 2015014114 W 20151222
Abstract (en)
[origin: EP3239340A1] The present disclosure relates to super duplex stainless steel having excellent yield strength and impact toughness, wherein a reduction ratio and a heat treatment temperature are controlled so as to improve mechanical properties. The super duplex stainless steel having excellent yield strength and impact toughness according to one embodiment of the present disclosure is thick super duplex stainless steel having a thickness of 30 mm or greater, and includes, in weight%, Cr: 24% to 26%, Ni: 6.0% to 8.0%, Mo: 3.5% to 5.0%, N: 0.24% to 0.32%, and the remainder being Fe and inevitable impurities, wherein a microstructure includes a ferrite phase, an austenite phase and a secondary austenite phase, and grain size is 25 µm or less.
IPC 8 full level
C22C 38/44 (2006.01); C21D 1/26 (2006.01); C21D 8/02 (2006.01); C22C 38/18 (2006.01)
CPC (source: CN EP KR US)
C21D 1/26 (2013.01 - CN EP KR US); C21D 6/004 (2013.01 - EP US); C21D 8/02 (2013.01 - EP KR US); C21D 8/0205 (2013.01 - EP US); C21D 8/0226 (2013.01 - CN EP US); C21D 8/0263 (2013.01 - EP US); C21D 9/46 (2013.01 - EP US); C22C 38/001 (2013.01 - CN EP US); C22C 38/18 (2013.01 - KR); C22C 38/44 (2013.01 - CN EP KR US); C21D 8/0426 (2013.01 - EP US); C21D 2211/001 (2013.01 - CN EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/005 (2013.01 - CN EP US)
Citation (search report)
- [E] KR 101615453 B1 20160425 - POSCO [KR]
- [A] MARTINS M ET AL: "Heat treatment temperature influence on ASTM A890 GR 6A super duplex stainless steel microstructure", MATERIALS CHARACTERIZATION, ELSEVIER, NEW YORK, NY, US, vol. 55, no. 3, 1 September 2005 (2005-09-01), pages 225 - 233, XP027790515, ISSN: 1044-5803, [retrieved on 20050901]
- [A] IRENE CALLIARI ET AL: "Phase Transformation in Duplex Stainless Steels after Isothermal Treatments, Continuous Cooling and Cold Working", MATERIALS SCIENCE FORUM, 1 January 2010 (2010-01-01), pages 2986 - 2991, XP055477979, Retrieved from the Internet <URL:https://doi.org/10.4028/www.scientific.net/MSF.638-642.2986?nosfx=y> [retrieved on 20180524], DOI: 10.4028/www.scientific.net/MSF.638-642.2986
- [A] NAMURATA SATHIRACHINDA ET AL: "Scanning Kelvin probe force microscopy study of chromium nitrides in 2507 super duplex stainless steelImplications and limitations", ELECTROCHIMICA ACTA, ELSEVIER SCIENCE PUBLISHERS, BARKING, GB, vol. 56, no. 4, 8 August 2010 (2010-08-08), pages 1792 - 1798, XP028141133, ISSN: 0013-4686, [retrieved on 20100817], DOI: 10.1016/J.ELECTACTA.2010.08.038
- See references of WO 2016105094A1
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 3239340 A1 20171101; EP 3239340 A4 20180725; CN 107109603 A 20170829; CN 107109603 B 20190507; JP 2018501403 A 20180118; KR 101668532 B1 20161024; KR 20160080316 A 20160708; US 2017327923 A1 20171116; WO 2016105094 A1 20160630
DOCDB simple family (application)
EP 15873621 A 20151222; CN 201580071309 A 20151222; JP 2017528546 A 20151222; KR 20140191169 A 20141226; KR 2015014114 W 20151222; US 201515536356 A 20151222