EP 4310214 A1 20240124 - DUPLEX STAINLESS STEEL
Title (en)
DUPLEX STAINLESS STEEL
Title (de)
DUPLEXEDELSTAHL
Title (fr)
ACIER INOXYDABLE DUPLEX
Publication
Application
Priority
- JP 2021040916 A 20210315
- JP 2022010351 W 20220309
Abstract (en)
There is provided a duplex stainless steel including a chemical composition consisting of, in mass%, C: 0.10% or less, Si: 3.0% or less, Mn: 8.0% or less, P: 0.040% or less, S: 0.020% or less, Cr: 20.0 to 38.0%, Ni: 3.00 to 12.00%, Mo: 1.0 to 6.5%, Cu: 3.0% or less, N: 0.200 to 0.700%, Al: 0 to 1.0%, Sn: 0 to 1.0%, W: 0 to 6.0%, Co: 0 to 3.0%, Nb: 0 to 0.50%, Ti: 0 to 1.5%, V: 0 to 1.0%, Zr: 0 to 0.50%, Ta: 0 to 0.100%, B: 0 to 0.100%, Ca: 0 to 0.50%, Mg: 0 to 0.50%, and REM: 0 to 0.10%, with the balance: Fe and impurities, wherein PRE is 41.0 or more, Creq/Nieq is 2.360 to 2.530, an average Md value is 0.9140 or less, and an area fraction of a σ phase is 2.0% or less.
IPC 8 full level
C22C 38/00 (2006.01); C21D 8/06 (2006.01); C22C 38/58 (2006.01)
CPC (source: EP)
C21D 1/26 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 7/13 (2013.01); C21D 8/005 (2013.01); C21D 8/065 (2013.01); C21D 9/0075 (2013.01); C21D 9/525 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/52 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 2211/001 (2013.01); C21D 2211/005 (2013.01)
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
Designated extension state (EPC)
BA ME
Designated validation state (EPC)
KH MA MD TN
DOCDB simple family (publication)
EP 4310214 A1 20240124; EP 4310214 A4 20240904; CN 116997670 A 20231103; JP WO2022196498 A1 20220922; WO 2022196498 A1 20220922
DOCDB simple family (application)
EP 22771249 A 20220309; CN 202280021821 A 20220309; JP 2022010351 W 20220309; JP 2023507031 A 20220309