EP 1645650 A1 20060412 - DUPLEX STAINLESS STEEL
Title (en)
DUPLEX STAINLESS STEEL
Title (de)
DUPLEXEDELSTAHL
Title (fr)
ACIER INOXYDABLE A DEUX COUCHES
Publication
Application
Priority
- JP 2004009511 W 20040629
- JP 2003188045 A 20030630
Abstract (en)
A duplex stainless steel having excellent pitting resistance and weldability and particularly a duplex stainless steel which does not form minute intermetallic compounds even in a weld heat affected zone is provided. It has a chemical composition comprising C: at most 0.03%, Si: at most 1.0%, Mn: at most 1.5%, P: at most 0.040%, S: at most 0.008%, Cr: 23.0 - 27.0%, Mo: 2.0 - 4.0%, Ni: 5.0 - 9.0%, W: greater than 1.5% up to 5.0%, N : 0.24 - 0.35%, and a remainder of Fe and impurities and satisfying the relationships PREW = Cr + 3.3 ( Mo + 0.5 W ) + 16 N€ƒis€ƒat€ƒleast€ƒ 40 €ƒand Mo + 1.1 Ni ‰¤ 12.5 Mo ˆ’ 0.8 Ni ‰¤ ˆ’ 1.6 wherein the number of coarse inclusions having the following definition observed in a cross section is at most 10 per mm 2 . Here, coarse inclusions are defined as inclusions containing at least 20 mass % of Al and having a major diameter of at least 5 micrometers.
IPC 1-7
IPC 8 full level
C22C 38/00 (2006.01); C22C 38/44 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP US)
C22C 38/001 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US)
Designated contracting state (EPC)
GB IT SE
DOCDB simple family (publication)
EP 1645650 A1 20060412; EP 1645650 A4 20070725; AU 2004252373 A1 20050106; AU 2004252373 B2 20070222; BR PI0412092 A 20060905; CN 100497704 C 20090610; CN 1816640 A 20060809; JP 4265605 B2 20090520; JP WO2005001151 A1 20060810; KR 100704201 B1 20070409; KR 20060026898 A 20060324; NO 20056009 L 20060111; US 2006191605 A1 20060831; WO 2005001151 A1 20050106
DOCDB simple family (application)
EP 04746980 A 20040629; AU 2004252373 A 20040629; BR PI0412092 A 20040629; CN 200480018803 A 20040629; JP 2004009511 W 20040629; JP 2005511147 A 20040629; KR 20057025084 A 20051227; NO 20056009 A 20051216; US 31520305 A 20051223