EP 2799569 A1 20141105 - HIGH STRENGTH AUSTENITIC STAINLESS STEEL, AND PREPARATION METHOD THEREOF
Title (en)
HIGH STRENGTH AUSTENITIC STAINLESS STEEL, AND PREPARATION METHOD THEREOF
Title (de)
HOCHFESTER AUSTENITISCHER ROSTFREIER STAHL UND HERSTELLUNGSVERFAHREN DAFÜR
Title (fr)
ACIER INOXYDABLE AUSTÉNITIQUE À RÉSISTANCE ÉLEVÉE ET SON PROCÉDÉ DE PRÉPARATION
Publication
Application
Priority
- KR 20110144126 A 20111228
- KR 2012011696 W 20121228
Abstract (en)
The present invention relates to control of the components of a metastable austenitic stainless steel capable of being used as a steel for a high strength spring, and a preparation method thereof. The austenitic stainless steel comprises 0.05-0.15 % of C, 0.05-0.09 % of N, 15-18 % of Cr, 6-8 % of Ni, Si in an amount exceeding 1.0 % and of no more than 1.5 %, 0.5-0.9 % of Mo, 0.4-1.2 % of Mn, 1.5 % or less of Cu, and the balance of Fe and other inevitable impurities by weight, wherein the Md30 temperature represented by the following formula (1) satisfies the temperature range of 25-30 °C, the solid solution strengthening property of the delta ferrite phase is maximized through the production of a coil using strip casting, the tensile strength is 2200 Mpa or higher at a cold rolling reduction ratio of 80%, and the hardness exceeds 570 Hv.
IPC 8 full level
C22C 38/00 (2006.01); B22D 11/06 (2006.01); C21D 6/00 (2006.01); C21D 9/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/40 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01)
CPC (source: EP)
B22D 11/0622 (2013.01); C21D 6/004 (2013.01); C21D 9/02 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)
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 2799569 A1 20141105; EP 2799569 A4 20160309; CN 104105805 A 20141015; CN 104105805 B 20161102; JP 2015508453 A 20150319; JP 6150819 B2 20170621; KR 101623290 B1 20160520; KR 20140103297 A 20140826; WO 2013100687 A1 20130704
DOCDB simple family (application)
EP 12861886 A 20121228; CN 201280065481 A 20121228; JP 2014550021 A 20121228; KR 2012011696 W 20121228; KR 20147017680 A 20121228