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Stainless Steel - Grade 2205/1.4462

Description

Duplex Stainless Steel 2205/1.4462, also known as UNS S32205, is a nitrogen-enhanced duplex stainless steel characterized by its unique microstructure, which consists of approximately 40-50% ferrite and the remainder as austenite. This combination provides excellent mechanical properties and corrosion resistance, making it suitable for various demanding applications.

Chemical Composition

Element Composition (%)
Chromium (Cr) 21.0 - 23.0
Nickel (Ni) 4.5 - 6.5
Molybdenum (Mo) 2.5 - 3.5
Carbon (C) ≤ 0.030
Nitrogen (N) 0.08 - 0.20
Manganese (Mn) ≤ 2.0
Silicon (Si) ≤ 1.0
Phosphorus (P) ≤ 0.030
Sulfur (S) ≤ 0.020
Iron (Fe) Balance

Mechanical Properties

Duplex 2205 exhibits superior mechanical properties compared to standard austenitic stainless steels:

  • Ultimate Tensile Strength: Minimum 95 ksi
  • Yield Strength (0.2% offset): Minimum 65 ksi
  • Hardness: Maximum 31 Rockwell C

    • Thermal & Physical Properties

  • Density: Approximately 7.8 g/cm³
  • Melting Point: 1400 - 1450 °C
  • Thermal Conductivity: 16.2 W/m•K
  • Specific Heat: 500 J/kg•K

    • Other Designations

    Duplex 2205 is recognized by several designations, including:

  • UNS: S31803
  • UNS : S32205
  • ASTM: A240
  • EN: 1.4462
  • DIN W.Nr : 1.4462

    • Fabrication and Heat Treatment

    Duplex 2205 can be fabricated using standard techniques, including welding, machining, and forming. It is weldable with appropriate filler materials (e.g., ER2209). Heat treatment is not typically required for this grade, but if necessary, it should be performed at temperatures below 300 °C to avoid embrittlement.

    Applications

    Duplex 2205 is widely used in various industries due to its excellent corrosion resistance and mechanical strength. Common applications include:

  • Chemical processing equipment (vessels, piping, heat exchangers)
  • Oil and gas industry (piping, tubing)
  • Marine environments (cargo tanks, offshore platforms)
  • Pulp and paper manufacturing (digesters, bleaching equipment)
  • Food processing equipment

    • Supplied Forms

    Duplex 2205 is available in several forms, including:

  • Sheets
  • Plates
  • Bars
  • Tubes (welded and seamless)
  • Fittings (elbows, tees, flanges, etc.)

    • Features

  • High resistance to chloride stress corrosion cracking
  • Excellent pitting and crevice corrosion resistance
  • Good weldability and workability
  • High strength, approximately double that of standard austenitic stainless steels

    • This datasheet provides a comprehensive overview of Duplex Stainless Steel 2205, highlighting its properties and applications in various industries.

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