Impact Charpy J 130 Hardness HB 235 Rc 23. Elevated Temperature Properties* While the oxidation resistance of 2205 is good at high temperature as with other duplex stainless steel grades, it is subject to embrittlement when exposed to temperatures above 300. o. C even for short periods. It is subject to embrittlement at 475 C when DUPLEX Stainless Steel - Steel TankWhat is the Family Lean Duplex SS lower nickel and no molybdenum 2101, 2102, 2202, 2304 Duplex SS higher nickel and molybdenum - 2205, 2003, 2404 Super Duplex 25Chromium and higher nickel and molybdenum plus 2507, 255 and Z100 Hyper Duplex More Cr, Ni, Mo and N -
In addition to the improved corrosion resistance compared with the 300 series stainless steels duplex steels also have higher strength. For example, a Type 304 stainless steel has a 0.2% proof strength in the region of 280N/mm 2, a 22%Cr duplex stainless steel a minimum 0.2% proof strength of some 450N/mm 2 and a superduplex grade a minimum of 550N/mm 2. Embrittlement in Stainless Steels - IJSERFerritic and duplex stainless steels have higher hardness and lower ductility after heating in the range of ~ 300-550°C  . This phenomenon has been observed in DSS after only 15 minutes of aging at 475°C . Embrittlement of duplex stainless steels at 475°C is accompanied by an increase in both the ferrite hardness and the ductile to IMPROVED CORROSION PERFORMANCE IN SUPER Duplex and super-duplex stainless steels are characterized by a two-phase microstructure that contains approximately 45-65% austenite, which is embedded as islands in a matrix of 35-55% ferrite. Since both phases prevent grain growth, it means that duplex stainless steels have a fine grain structure.
The first phase of material impact testing stainless steel base and welded materials (at -20 oF, room, 300 oF, and 600 oF temperatures reflecting strain rates below 40 per second) is now complete. Higher strain rates of interest (40 to 200 per second) at the same temperature conditions still need to Minimum Design Temperature without Impact testing for Feb 10, 2010 · Regarding duplex stainless steels, they are mentioned in Material category A-3 of Table 323.2.2 along with other carbon and high alloy ferritic steels, etc. Since this grade of duplex stainless steel is not listed in Table A-1 specifically, but is mentioned in row A-3, see column B of Table 323.2.2, Notes 3 and 5. PMIS Solves Problems - Duplex Super Duplex ReportNORSOK has a different standard for Duplex and Super Duplex as well as for each form of material. Rather then listing each of the requirements, we attach each standard. Please note the requirements for Impact Testing, Micrographic Examination and Liquid Dye Penetrant testing required for both 22% and 25% Cr. Corrosion Testing also required for 25% Cr.
Qualification Standards for Cast Super Duplex Stainless Steel provides information on the testing of Super Duplex Stainless Steels to ASTM A923. Volume 4 is the Guidance Document for the Evaluation of Super Duplex Stainless Steel and involves the applicability of ASTM A923 to the Cast Super Duplex materials. Toughness Testing and ASME B31.3 Process Piping Code Impact tests may be Charpy Tests performed at 320F (196C) only if Type 316L weld filler metal is used (and measured to have a Ferrite Number no greater than 5). THESE TESTS ARE PERFORMED AT 320F REGARDLESS OF THE ACTUAL LOWER DESIGN TEMPERATURE.Duplex Stainless Steels - Materials EngineeringMay 18, 2005 · Heat Resistance of Duplex s tainless steel The high chromium content of Duplex s tainless steel that p rotects against corrosion, causes embrittlement at temperatures over about 300°C. At low temperatures duplex stainless steels have better ductility than the ferritic and martensitic grades.