EP 1838890 A4 20080220 - DUPLEX STAINLESS STEEL HAVING EXCELLENT CORROSION RESISTANCE WITH LOW NICKEL
Title (en)
DUPLEX STAINLESS STEEL HAVING EXCELLENT CORROSION RESISTANCE WITH LOW NICKEL
Title (de)
DUPLEXEDELSTAHL MIT HERVORRAGENDER KORROSIONSBESTÄNDIGKEIT MIT GERINGEM NICKEL
Title (fr)
ACIER INOXYDABLE DUPLEX PRESENTANT UNE EXCELLENTE RESISTANCE A LA CORROSION ET DOTE D'UNE FAIBLE TENEUR EN NICKEL
Publication
Application
Priority
- KR 2005004472 W 20051222
- KR 20040113129 A 20041227
Abstract (en)
[origin: WO2006071027A1] Disclosed is duplex stainless steel that contains relatively low content of Ni, and limits constituents of Cr-Mo-Mn-N to make volume fraction of a and ? have about 50:50, thereby minimizing incidence of a edge crack to enhance a production yield and decrease a processing load, in which the alloy constituents includes Cr of 19.5 ~ 22.5%, Mo of 0.5-2.5%, Ni of 1.0-3.0%, Mn of 1.5-4.5%, N of 0.15-0.25%, Fe and unavoidable elements, and a constitution range of the alloy constituents are adjusted to make a CPT highter than 20°C depending on the constitution range of the alloy constituents. Thus, the contents of Cr, Mo and Ni is decreased and the content of Mn is increased a little, so that a production cost thereof is reduced; the corrosion resistance is secured to be better than the STS 304 steel and the 316L steel; the incidence of the edge cract is decreased while being hot-rolled, thereby decreasing a load on the following process; and the surface defective is decreased, thereby improving a production yield.
IPC 8 full level
C22C 38/18 (2006.01)
CPC (source: EP KR US)
C22C 38/001 (2013.01 - EP US); C22C 38/18 (2013.01 - KR); C22C 38/44 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US)
Citation (search report)
- [X] JP H03173746 A 19910729 - NIPPON KOKAN KK
- [X] JP H0382740 A 19910408 - SUMITOMO METAL IND
- [A] WO 0227056 A1 20020404 - AVESTAPOLARIT AKTIEBOLAG PUBL [SE], et al
- [A] EP 0314649 A2 19890503 - SANDVIK AB [SE]
- [A] EP 0708845 B1 19991020 - SANDVIK AB [SE]
- [A] JP H10102206 A 19980421 - KUBOTA KK
- See references of WO 2006071027A1
Designated contracting state (EPC)
DE FR IT SE
DOCDB simple family (publication)
WO 2006071027 A1 20060706; CN 101090988 A 20071219; EP 1838890 A1 20071003; EP 1838890 A4 20080220; JP 2008525636 A 20080717; KR 20060074400 A 20060703; US 2008112840 A1 20080515
DOCDB simple family (application)
KR 2005004472 W 20051222; CN 200580045052 A 20051222; EP 05822027 A 20051222; JP 2007548086 A 20051222; KR 20040113129 A 20041227; US 72234105 A 20051222