2205 Duplex OverviewChemical Composition, %Corrosion ResistanceMechanical Properties(Specified Tensile Properties ASTM A240)Forms of Duplex 2205ASTM SpecificationsApplicationsAbout MEGA MEX2205 Duplex OverviewDuplex 2205is anitrogen enhanced duplex stainless steeldeveloped for combating common corrosion issues encountered with the 300 series stainless steels. Mega Mex supplies duplex and super duplex stainless steels in plate, sheet, bar, pipe, pipe fittings, flanges, tube and weld wire.Duplex is a stainless steel family that is neither fully austenitic, such as 304 stainless, nor ferritic such as 430 stainless steel. The 2205 duplex stainless steel structure consists of austenite pools surrounded by a continuous ferrite phase. In the annealed condition, 2205 has approximately 40-50% ferrite. The 2205 Duplexis mostly referred to as the work horse grade and is the most widely used grade in the duplex family of stainless steels.The benefit of a duplex structure is that the favorable qualities of a ferritic alloy are combined with those of an austenitic alloy that features corrosion resistance and ease of fabrication. Usage of2205 Duplex stainless steelshould be limited to temperatures below 600 F. Extended elevated temperature exposure can embrittle 2205 stainless.

Chemical Composition, %The chemical composition of 2205 Duplex is:CrNiMoCNMnSiPSFe

22.0-23.04.50-6.503.00-3.50.030 Max0.14-0.202.00 Max1.00 Max.030 Max.020 MaxBalance

Corrosion ResistanceThe 2205 duplex stainless steel is an economical solution for a number of applications where the 300 series stainless steels are susceptible to chloride stress corrosion cracking. Stress corrosion cracking occurs when stainless steels are subjected to tensile stress, while in contact with solutions containing chlorides. The susceptibility of stainless steels to stress corrosion cracking is also increased by increasing temperatures.Combining molybdenum, chromium and nitrogen result in 2205 having good resistance to chloride pitting and crevice corrosion. This resistance is highly important for services such as marine environments, brackish water, bleaching operations, closed loop water systems and some food processing applications. The high chromium, molybdenum and nitrogen contents of 2205 offer corrosion resistance superior to common stainless steels, such as, 316L and 317L in most environments.Mechanical Properties (Specified Tensile Properties ASTM A240)The mechanical properties of Duplex 2205 are provided in the table:Ultimate Tensile Strength, ksi Minimum.2% Yield Strength, ksi MinimumHardness Max.

956531 Rockwell C

Forms of Duplex 2205The available forms of Duplex 2205 are: Plate Sheet Bar Pipe & Tube (welded & seamless) Fittings (i.e., flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples) Welding Wire and Welding Electrode.ASTM SpecificationsPipe SmlsPipe WeldedTube SmlsTube WeldedSheet/PlateBarFlanges, Fittings & Valves

A790A790A789A789A240A276A182

ApplicationsThe applications of Duplex 2205 are: Chemical process vessels In what applications, piping and heat exchangers Flue gas desulfurization equipment Pulp mill digesters, bleach washers, chip pre-steaming vessels Food processing equipment Oil field piping and heat exchangers.About MEGA MEXSince 1990Mega Mexhas supplied specialty metal alloys throughout the world for industries requiring heat resistant, high temperature, corrosion resistant, and abrasion resistant alloys.Mega Mex specializes in the various nickel, stainless, duplex and super alloys in the form of plate, sheet, bar, tubing, pipe, flanges, fittings, wire and welding material. Other grades offered are aluminum, titanium, copper, brass, bronze and carbon steel.We serve customers of all sizes from allover the world. Supplying, processing and custom fabricating specialty metals for various industries including mining, chemical process, oil & gas, power generation, pulp and paper, petrochemical and more.In addition, we offer extensive processing capabilitites (saw, plasma, waterjet, laser, shear, oxyacetylene) to meet your custom cut needs.Our well-established and trusted relationships with the mill depots guarantee an uninterrupted supply to you of virtually any kind of metal products. Mega Mex is looking forward to providing you with your specialty metal needs!