EP 2677056 A1 20131225 - DUPLEX STAINLESS STEEL
Title (en)
DUPLEX STAINLESS STEEL
Title (de)
DUPLEXEDELSTAHL
Title (fr)
ACIER INOXYDABLE DUPLEX
Publication
Application
Priority
- JP 2011028334 A 20110214
- JP 2012053037 W 20120210
Abstract (en)
Provided is a duplex stainless steel that can suppress precipitation of a à phase at the time of high heat input welding, is excellent in SCC resistance under high-temperature chloride environments, and has a high strength. The duplex stainless steel according to the present invention includes a chemical composition containing, in mass percent, C: at most 0.030%, Si: 0.20 to 1.00%, Mn: at most 8.00%, P: at most 0.040%, S: at most 0.0100%, Cu: more than 2.00% and at most 4.00%, Ni: 4.00 to 8.00%, Cr: 20.0 to 28.0%, Mo: 0.50 to 2.00%, N: 0.100 to 0.350%, and sol. Al: at most 0.040%, the balance being Fe and impurities, and satisfying Expression (1) and Expression (2); a structure having a ferrite rate of at least 50%; and a yield strength of at least 550 MPa or more: 2.2 ¢ Cr + 7 ¢ Mo + 3 ¢ Cu > 66 Cr + 11 ¢ Mo + 10 ¢ Ni < 12 ¢ Cu + 30 ¢ N
IPC 8 full level
C22C 38/00 (2006.01); C21D 6/00 (2006.01); C21D 8/02 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/54 (2006.01); C22C 38/58 (2006.01); C21D 7/13 (2006.01)
CPC (source: EP US)
C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - EP US); C21D 8/0226 (2013.01 - EP US); C22C 38/001 (2013.01 - EP US); C22C 38/002 (2013.01 - EP US); C22C 38/005 (2013.01 - EP US); C22C 38/02 (2013.01 - EP US); C22C 38/04 (2013.01 - EP US); C22C 38/06 (2013.01 - EP US); C22C 38/42 (2013.01 - EP US); C22C 38/44 (2013.01 - EP US); C22C 38/46 (2013.01 - EP US); C22C 38/54 (2013.01 - EP US); C22C 38/58 (2013.01 - EP US); C21D 7/13 (2013.01 - EP US); C21D 2211/001 (2013.01 - EP US); C21D 2211/004 (2013.01 - EP US); C21D 2211/005 (2013.01 - EP US)
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 2677056 A1 20131225; EP 2677056 A4 20150325; EP 2677056 B1 20160518; AU 2012218661 A1 20130905; AU 2012218661 B2 20150430; BR 112013017647 A2 20161220; BR 112013017647 B1 20190326; CA 2826893 A1 20120823; CA 2826893 C 20160607; CN 103370435 A 20131023; CN 103370435 B 20160420; JP 5206904 B2 20130612; JP WO2012111537 A1 20140707; MX 2013008518 A 20130812; MX 351782 B 20171030; US 2013315776 A1 20131128; WO 2012111537 A1 20120823
DOCDB simple family (application)
EP 12747362 A 20120210; AU 2012218661 A 20120210; BR 112013017647 A 20120210; CA 2826893 A 20120210; CN 201280008724 A 20120210; JP 2012053037 W 20120210; JP 2012507515 A 20120210; MX 2013008518 A 20120210; US 201213984327 A 20120210