UNS S32205 (2205 Duplex Stainless Steel)

Short Introduction:

  • Material grades and equivalents: UNS S32205 (2205 Duplex Stainless Steel),UNS S31803.1.4462,022Cr23Ni5Mo3N,S22053,x2crnimon22-5-3,Z3CND22-05Az,318S13,2377 is the most widely used duplex stainless steel grade. Its high chromium and molybdenum content gives the stainless steel excellent corrosion resistance. The microstructure provides resistance to stress corrosion cracking and ensures high strength.


     UNS S32205 (2205 Duplex Stainless Steel)

    Material grades and equivalents: UNS S32205 (2205 Duplex Stainless Steel),UNS S31803.1.4462,022Cr23Ni5Mo3N,S22053,x2crnimon22-5-3,Z3CND22-05Az,318S13,2377

    Special properties:

    Alloy 2205 duplex stainlesssteel plate is a 22% Chromium, 3% Molybdenum, 5-6% Nickel nitrogen alloyed duplex stainless steel plate with high general, localized and stress corrosion resistance properties in addition to high strength and excellent impact toughness.

    Alloy 2205 duplex stainlesssteel plate provides pitting and crevice corrosion resistance superior to 316L or 317L austenitic stainless steels in almost all corrosive media. It also has high corrosion and erosion fatigue properties as well as lower thermal expansion and higher thermal conductivity than austenitic.

    The yield strength is about twice that of austenitic stainless steels. This allows a designer to save weight and makes the alloy more cost competitive when compared to 316L or 317L.

    Alloy 2205 duplex stainlesssteel plate is particularly suitable for applications covering the -50°F/+600°F temperature range. Temperatures outside this range may be considered but need some restrictions, particularly for welded structures.

    2205 Duplex Stainless SteelChemical composition:










    max   0.03

    max   1

    max   2

    4.5 – 6.5

    max   0.035

    max   0.015

    21 – 23

    2.5 – 3.5

    0.1 – 0.22

    2205 Duplex Stainless Steel Mechanical Properties:

    Density, g/cm³


    Melting range, °C


    2205 Duplex StainlessSteel Physical properties:


    Tensile Strength MPa

    Yield Strength (0.2% Offset) MPa

    Elongation (%)





    2205 Duplex Stainless Steel ASTM Specifications:

    Pipe Smls

    Pipe Welded

    Tube Smls

    Tube Welded



    Flanges, Fittings & Valves








    Heat Resistance

    Although 2205 has good high temperature oxidation resistance, this grade, like other duplex stainless steels, suffers from embrittlement if held for even short times at temperatures above 300oC. If embrittled this can only be rectified by a full solution annealing treatment. 2205 is annealed at 1020-1100oC followed by rapid cooling. This treatment applies for both solution annealing and stress relieving.


    The chemical analysis of 2205 duplex stainlesssteel plate is optimized to obtain a typical 50 a/ 50 g microstructure after solution annealing treatment at 1900°/1922°F (1040°/1080°C).

    Chloride Pitting Resistance

    The pitting resistance of an austenitic stainless steel can be related directly to alloy composition, where chromium, molybdenum and nitrogen are a weight %. The Pitting Resistance Equivalent Number (PREN) uses the following formula to measure an alloy’s relative pitting resistance – the higher the number, the better the pitting resistance.

    2205 Duplex Stainless Steel Applications

    • Chemical process vessels, piping and heat exchangers

    • Pulp mill digesters, bleach washers, chip pre-steaming vessels

    • Food processing equipment

    • Oil field piping and heat exchangers

    • Flue gas desulfurization equipment

    Shanghai HY Industry Co., Ltd has international first-class material production equipment such as high temperature alloy isothermal forging production line, CONSARC vacuum melting furnace, VAR vacuum arc remelting furnace etc., with strong professional ability and highly responsible management team. We are a member of China Application of nuclear energy materials, Member of the International Council of the Aeronautical Sciences,China Electronic Materials Industry Association Magnetic Materials Branch. Years of experience in special alloy. When you have superalloy material inquiry, please contact us without hesitation. Shanghai HY Industry Co., Ltd is Corrosion & fatigue nickel alloy professional manufacturer,We will provide you with sincere and thoughtful service.

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