EP 1722002 B1 20080402 - Duplex steel alloy
Title (en)
Duplex steel alloy
Title (de)
Duplexstahllegierung
Title (fr)
Alliage d'acier duplex
Publication
Application
Priority
- EP 02763168 A 20020902
- SE 0102931 A 20010902
Abstract (en)
[origin: WO03020994A1] The present invention relates to a stainless steel alloy, closer determined a duplex stainless steel alloy with ferritic-austenitic matrix and with high resistance to corrosion in combination with good structural stability and hotworkability, in paricular a duplex stainless steel with a content of ferrite of 40-65% and a well balanced compositon that imparts material corrosion properties, which makes it is more suitable for use in chloride-containing environments than earlier been considered being possible. The total PRE- or PREW-number exceeds 44 a PRE-number on at least between 46 and 50 in both the austenite phase and the ferrite phase, whereby PRE = %Cr + 3,3%Mo + 16N and PREW = %Cr + 3,3(%Mo + 0,5%W) + 16N, wherein % considers weight-% and ratio between PRE(W)-value for the austenite phase and PRE(W)-value for the ferrite phase lies between 0,90 and 1,15. These purposes are fulfilled according to the present invention with duplex stainless steel alloys which contain (in weight-%) up to 0,03% C, up to 0,5% Si, 24,0-30,0% Cr, 4,9-10,0% Ni, 3,0-5,0% Mo, 0,28-0,5% N, 0-3,0% Mn, 0-0,0030% B, up to 0,010%, 0-0,03% Al, 0-0,010% Ca, 0-3,0% W, 0-2,0% Cu, 0-3,5% Co, 0-0,3% Ru, balance Fe and inevitable impurities.
IPC 8 full level
C22C 38/44 (2006.01); C22C 38/00 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C22C 38/52 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP KR US)
C22C 38/005 (2013.01 - EP US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP US); C22C 38/50 (2013.01 - EP US); C22C 38/52 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
DOCDB simple family (publication)
WO 03020994 A1 20030313; AT E335867 T1 20060915; AT E391192 T1 20080415; AU 2002328002 B2 20070705; AU 2002328002 B9 20080313; BR 0212270 A 20041013; BR 0212270 B1 20110531; CA 2459253 A1 20030313; CN 100465325 C 20090304; CN 1571862 A 20050126; DE 60213828 D1 20060921; DE 60213828 T2 20070301; DE 60225951 D1 20080515; DE 60225951 T2 20090409; DK 1423548 T3 20061204; DK 1722002 T3 20080728; EP 1423548 A1 20040602; EP 1423548 B1 20060809; EP 1722002 A1 20061115; EP 1722002 B1 20080402; ES 2266557 T3 20070301; ES 2300088 T3 20080601; JP 2005501969 A 20050120; JP 4234592 B2 20090304; KR 100989022 B1 20101020; KR 20040029142 A 20040403; KR 20090128568 A 20091215; MX PA04002017 A 20040708; NO 20040900 L 20040430; NO 338090 B1 20160725; OA 12657 A 20060619; PL 199387 B1 20080930; PL 368230 A1 20050321; SE 0102931 D0 20010902; SE 0102931 L 20030303; SE 524952 C2 20041026; US 2003086808 A1 20030508
DOCDB simple family (application)
SE 0201564 W 20020902; AT 02763168 T 20020902; AT 06113879 T 20020902; AU 2002328002 A 20020902; BR 0212270 A 20020902; CA 2459253 A 20020902; CN 02820617 A 20020902; DE 60213828 T 20020902; DE 60225951 T 20020902; DK 02763168 T 20020902; DK 06113879 T 20020902; EP 02763168 A 20020902; EP 06113879 A 20020902; ES 02763168 T 20020902; ES 06113879 T 20020902; JP 2003525691 A 20020902; KR 20047003155 A 20020902; KR 20097023792 A 20020902; MX PA04002017 A 20020902; NO 20040900 A 20040302; OA 1200400067 A 20020902; PL 36823002 A 20020902; SE 0102931 A 20010902; US 23272602 A 20020903