EP 3712289 A1 20200923 - TWO-PHASE STAINLESS STEEL AND METHOD FOR MANUFACTURING TWO-PHASE STAINLESS STEEL
Title (en)
TWO-PHASE STAINLESS STEEL AND METHOD FOR MANUFACTURING TWO-PHASE STAINLESS STEEL
Title (de)
ZWEIPHASIGER ROSTFREIER STAHL UND VERFAHREN ZUR HERSTELLUNG VON ZWEIPHASIGEM ROSTFREIEM STAHL
Title (fr)
ACIER INOXYDABLE BIPHASIQUE ET PROCÉDÉ DE FABRICATION D'ACIER INOXYDABLE BIPHASIQUE
Publication
Application
Priority
- JP 2017220172 A 20171115
- JP 2018042114 W 20181114
Abstract (en)
A duplex stainless steel with occurrence of pitting suppressed is provided. A duplex stainless steel according to the present disclosure has a chemical composition consisting of, in mass%, Cr: more than 27.00% to 29.00%, Mo: 2.50 to 3.50%, Ni: 5.00 to 8.00%, W: 4.00 to 6.00%, Cu: 0.01 to less than 0.10%, N: more than 0.400% to 0.600%, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, sol.Al: 0.040% or less, V: 0.50% or less, O: 0.010% or less, P: 0.030% or less, and S: 0.020% or less with the balance being Fe and impurities and satisfying Formula (1), a microstructure consisting of 35 to 65 volume% of ferrite phase with the balance being the austenite phase, and the area fraction of Cu precipitated in the ferrite phase is 0.5% or less.Cr+4.0×Mo+2.0×W+20×N−5×lnCu≥65.2
IPC 8 full level
C21D 8/00 (2006.01); C22C 38/00 (2006.01); C22C 38/54 (2006.01)
CPC (source: EP KR US)
C21D 6/00 (2013.01 - EP); C21D 6/004 (2013.01 - EP US); C21D 6/005 (2013.01 - US); C21D 6/008 (2013.01 - US); C21D 8/005 (2013.01 - US); C21D 8/02 (2013.01 - EP); C21D 8/0205 (2013.01 - EP); C21D 8/0226 (2013.01 - EP); C21D 8/0263 (2013.01 - EP); C21D 9/46 (2013.01 - EP); C22C 38/00 (2013.01 - EP); C22C 38/001 (2013.01 - EP US); C22C 38/002 (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 KR US); C22C 38/44 (2013.01 - EP KR US); C22C 38/46 (2013.01 - EP KR US); C22C 38/54 (2013.01 - EP KR US); C21D 2211/001 (2013.01 - US); C21D 2211/005 (2013.01 - EP KR 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
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
EP 3712289 A1 20200923; EP 3712289 A4 20210310; BR 112020009434 A2 20201103; CA 3080706 A1 20190523; CN 111344426 A 20200626; JP WO2019098233 A1 20201119; KR 20200080312 A 20200706; US 2020332378 A1 20201022; WO 2019098233 A1 20190523
DOCDB simple family (application)
EP 18879992 A 20181114; BR 112020009434 A 20181114; CA 3080706 A 20181114; CN 201880073296 A 20181114; JP 2018042114 W 20181114; JP 2019554253 A 20181114; KR 20207016636 A 20181114; US 201816759798 A 20181114