Title (en)

HIGH STRENGTH / CORROSION-RESISTANT,.AUSTENITIC STAINLESS STEEL WITH CARBON - NITROGEN COMPLEX ADDITIVE, AND METHOD FOR MANUFACTURING SAME

Title (de)

HOCHFESTER KORROSIONSBESTÄNDIGER AUSTENITISCHER EDELSTAHL MIT KOHLENSTOFF-STICKSTOFF-KOMPLEXZUSATZ UND HERSTELLUNGSVERFAHREN DAFÜR

Title (fr)

ACIER INOXYDABLE AUSTÉNITIQUE TRÈS RÉSISTANT MÉCANIQUEMENT ET À LA CORROSION, COMPRENANT UN ADDITIF COMPLEXE DE CARBONE ET D'AZOTE, ET PROCÉDÉ DE FABRICATION CORRESPONDANT

Publication

EP 2455508 A4 20140305 (EN)

Application

EP 09847378 A 20090820

Priority

• KR 2009004642 W 20090820
• KR 20090063486 A 20090713
• KR 20090063487 A 20090713

Abstract (en)

[origin: WO2011007921A1] The present invention relates to high strength / corrosion-resistant, austenitic stainless steel with a carbon-nitrogen complex additive, and particularly, to an austenitic stainless steel with a carbon (C) and nitrogen (N) complex additive containing: 8-12 wt % of manganese (Mn); 15-20 wt % of chromium (Cr); less than 2 wt % of nickel (Ni); less than 4 wt % of tungsten (W); less than 2 wt % of molybdenum (Mo); 0.6-1.0 wt % of the total content (C+N) of carbon (C) and nitrogen (N); with the remainder being iron (Fe) and other unavoidable impurities, and to a method for manufacturing same. By controlling the content of the interstitial elements (C+N, C/N) and the substitution elements (Mn+Cr, Mn/Cr, or 0.5W+Mo), the austenitic stainless steel manufactured according to the present invention has a tensile strength of more than 850 MPa and uniform elongation of more than around 45%, thereby exhibiting excellent corrosion resistance as well as improving processability, and the content of Ni, a toxic alloy element, is minimized to improve biocompatibility, making the austenite stainless steel applicable to conventional and offshore structures, desalination facilities, and materials for oil and gas facilities / drilling, transportation and the like, which require high strength and high corrosion resistance, and may also be used to manufacture various functional parts for medical prosthetic materials, and accessories such as jewelry, watches, and the like.

IPC 8 full level

C22C 38/38 (2006.01); C22C 38/44 (2006.01)

CPC (source: EP US)

C21D 1/18 (2013.01 - EP US); C21D 6/002 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 8/021 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C21D 8/0405 (2013.01 - EP US); C21D 8/041 (2013.01 - EP US); C21D 8/0426 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/22 (2013.01 - EP US); C22C 38/38 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C21D 2211/001 (2013.01 - EP US)

Citation (search report)

• [XY] EP 1229142 A1 20020807 - DAIDO STEEL CO LTD [JP]
• [IY] DE 2118072 A1 19721026
• [Y] WHITE W ET AL: "Metallographic observations on the formation and occurrence of ferrite, sigma phase, and carbides in austenitic stainless steels", METALLOGRAPHY, AMERICAN ELSEVIER, NEW YORK, NY, US, vol. 3, no. 1, 1 March 1970 (1970-03-01), pages 35 - 50, XP023901147, ISSN: 0026-0800, [retrieved on 19700301], DOI: 10.1016/0026-0800(70)90003-0
• [Y] J SIMMONS: "Strain hardening and plastic flow properties of nitrogen-alloyed Fe-17Cr-(8-10)Mn-5Ni austenitic stainless steels", ACTA MATERIALIA, vol. 45, no. 6, 1 June 1997 (1997-06-01), pages 2467 - 2475, XP055097199, ISSN: 1359-6454, DOI: 10.1016/S1359-6454(96)00343-6
• See references of WO 2011007921A1

Designated contracting state (EPC)

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 SE SI SK SM TR

DOCDB simple family (publication)

WO 2011007921 A1 20110120; CN 102428200 A 20120425; CN 102428200 B 20140402; EP 2455508 A1 20120523; EP 2455508 A4 20140305; EP 2455508 B1 20161123; JP 2011526969 A 20111020; JP 5272078 B2 20130828; US 2011226391 A1 20110922

DOCDB simple family (application)

KR 2009004642 W 20090820; CN 200980159318 A 20090820; EP 09847378 A 20090820; JP 2011522918 A 20090820; US 99481509 A 20090820