EP 3239344 A4 20180530 - LEAN DUPLEX STAINLESS STEEL AND METHOD FOR PRODUCING SAME
Title (en)
LEAN DUPLEX STAINLESS STEEL AND METHOD FOR PRODUCING SAME
Title (de)
DÜNNER DUPLEX-EDELSTAHL UND VERFAHREN ZUR HERSTELLUNG DAVON
Title (fr)
ACIER INOXYDABLE DUPLEX PAUVRE ET SON PROCÉDÉ DE PRODUCTION
Publication
Application
Priority
- KR 20140191170 A 20141226
- KR 2015014235 W 20151224
Abstract (en)
[origin: EP3239344A1] The present invention relates to lean duplex stainless steel having a dual-phase structure of an austenite phase and a ferrite phase, and a method for producing the lean duplex stainless steel, the lean duplex stainless steel according to one embodiment of the present invention, as a ferrite-austenite stainless steel, having the preferred stacking fault energy (SFE) value of the austenite phase, expressed by the formula 2 below, of 19-37 and critical strain value range, within which the strain-induced martensite phases occurs, of 0.1-0.25. SFE = 25.7 + 1.59 × Ni / K Ni ˆ’ K Ni × V ³ + V ³ + 0.795 × Cu / K Cu ˆ’ K Cu × V ³ + V ³ ˆ’ 0.85 × Cr / K Cr ˆ’ K Cr × V ³ + V ³ + 0.001 × Cr / K Cr ˆ’ K Cr + V ³ + V ³ 2 + 38.2 × N / K N ˆ’ K N × V ³ + V ³ 0.5 ˆ’ 2.8 × Si / K Si ˆ’ K Si × V ³ + V ³ ˆ’ 1.34 × Mn / K Mn ˆ’ K Mn + V ³ + V ³ + 0.06 × Mn / K Mn ˆ’ K Mn × V ³ + V ³ 2 where Ni, Cu, Cr, N, Si and Mn indicate the overall content (wt.%) of the respective constituent element, and K(x) is the distribution index of respective constituent element (x) and is expressed by the formula 3 below, and V(³) is the component ratio of austenite (in the 0.45-0.75 range). K x = amount of element x in ferrite phase / amount of element x in austenite phase
IPC 8 full level
C22C 38/58 (2006.01); B22D 11/055 (2006.01); B22D 11/124 (2006.01); B22D 11/16 (2006.01); B22D 11/22 (2006.01); C21D 6/00 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01)
CPC (source: CN EP US)
B22D 11/055 (2013.01 - CN EP US); B22D 11/124 (2013.01 - CN EP US); B22D 11/16 (2013.01 - CN EP US); B22D 11/22 (2013.01 - EP US); C21D 6/004 (2013.01 - EP US); C22C 38/001 (2013.01 - CN EP US); C22C 38/02 (2013.01 - CN EP US); C22C 38/04 (2013.01 - EP US); C22C 38/34 (2013.01 - CN EP US); C22C 38/42 (2013.01 - CN EP US); C22C 38/44 (2013.01 - CN EP US); C22C 38/46 (2013.01 - CN EP US); C22C 38/48 (2013.01 - CN EP US); C22C 38/50 (2013.01 - CN EP US); C22C 38/58 (2013.01 - CN EP US); C21D 2211/001 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)
Citation (search report)
- [XI] EP 2699704 A1 20140226 - OUTOKUMPU OY [FI]
- [XI] EP 1715073 A1 20061025 - JFE STEEL CORP [JP]
- [A] WO 2013081422 A1 20130606 - POSCO [KR]
- [A] KR 20130125071 A 20131118 - POSCO [KR]
- [A] KR 20120016369 A 20120224 - POSCO [KR]
- [A] KR 20140084721 A 20140707 - POSCO [KR]
- [A] KR 20010073236 A 20010801 - PO HANG IRON & STEEL [KR]
- [A] CN 104131237 A 20141105 - BAOSTEEL STAINLESS STEEL CO
- [A] CN 102634740 A 20120815 - BAOSHAN IRON & STEEL
- [A] WO 9624452 A1 19960815 - KAWASAKI STEEL CO [JP], et al
- [A] KR 20140080347 A 20140630 - POSCO [KR]
- [A] KR 20140082491 A 20140702 - POSCO [KR]
- [A] KR 20130060658 A 20130610 - POSCO [KR]
- [A] EP 2246453 A1 20101103 - NIPPON STEEL & SUMIKIN SST [JP]
- See references of WO 2016105145A1
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 3239344 A1 20171101; EP 3239344 A4 20180530; EP 3239344 B1 20211020; CN 107107173 A 20170829; CN 107107173 B 20191101; JP 2018503741 A 20180208; JP 6484716 B2 20190313; KR 101766550 B1 20170810; KR 20160080275 A 20160707; US 2017326628 A1 20171116; WO 2016105145 A1 20160630
DOCDB simple family (application)
EP 15873672 A 20151224; CN 201580071241 A 20151224; JP 2017530070 A 20151224; KR 2015014235 W 20151224; KR 20150185726 A 20151224; US 201515536391 A 20151224