Supreme Steels

  • +91-9167212826
Twitter Linkedin Youtube
logo
Menu

Alloy 254 SMO

Home / Alloy 254 SMO

Products

  • Special Steels Division

  • Wire Division

    • Alloy 254 SMO - High-Performance Super Austenitic Stainless Steel

    Alloy 254 SMO is a super-austenitic stainless steel known for its exceptional resistance to pitting, crevice corrosion, and general corrosion in aggressive environments. It is a high-chromium, molybdenum, and nitrogen-containing alloy, designed to perform well in highly corrosive applications, particularly in marine and chemical environments. The alloy is particularly resistant to chloride-induced corrosion, making it a suitable material for applications in seawater and other aggressive media. Due to its high strength and excellent weldability, Alloy 254 SMO is often used in industries like chemical processing, offshore, power generation, and desalination plants.

    Features of Alloy 254 SMO:

    • Excellent Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and general corrosion, especially in chloride-rich environments (such as seawater).
    • High Molybdenum Content: The addition of molybdenum improves the alloy's resistance to pitting and crevice corrosion, making it ideal for chemical processing and marine applications.
    • Superior Resistance to Stress Corrosion Cracking (SCC): The alloy provides excellent resistance to SCC, especially in chloride-containing environments, making it highly reliable in offshore and subsea applications.
    • High Strength: Alloy 254 SMO offers high tensile and yield strength, ensuring durability and performance even under stress.
    • Good Weldability: Alloy 254 SMO can be welded with conventional welding methods (TIG, MIG, etc.), ensuring ease of fabrication.
    • Non-Magnetic: The alloy is non-magnetic in its annealed state, which can be an important feature for certain applications requiring minimal magnetic permeability.
    • Good Mechanical Properties: The alloy provides high toughness and ductility at both ambient and elevated temperatures, making it suitable for demanding industrial environments.
    • Enhanced Formability: 254 SMO has excellent formability, allowing it to be used in a variety of applications that require complex shapes and configurations.

    Specifications:

    • ASTM A240 (Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications)
    • UNS S31254 (Unified Numbering System designation for Alloy 254 SMO)
    • EN 1.4547
    • ASME SA240
    • ISO 683-13
    • BS 316S50
    These standards confirm Alloy 254 SMO’s suitability for a variety of industries, including chemical, marine, oil & gas, and power generation.
    Product Specification

    Composition of Alloy 254 SMO:

    Element Percentage
    Nickel (Ni) 18.0-20.0%
    Chromium (Cr) 19.5-20.5%
    Molybdenum (Mo) 6.0-6.5%
    Iron (Fe) Balance (remaining)
    Copper (Cu) 0.50% Max
    Carbon (C) 0.02% Max
    Manganese (Mn) 1.5% Max
    Silicon (Si) 0.8% Max
    Sulfur (S) 0.02% Max
    Phosphorus (P) 0.03% Max
    Nitrogen (N) 0.1-0.2%

    Physical Properties:

    Property Value
    Density 8.0 g/cm³
    Melting Point 1350-1400°C (2462-2552°F)
    Hardness (BHN) 230-270 BHN
    Tensile Strength 650 MPa (95,000 psi)
    Yield Strength 290 MPa (42,000 psi)
    Elongation 35%
    Modulus of Elasticity 200 GPa
    Thermal Conductivity 15.0 W/m·K
    Coefficient of Thermal Expansion 16.5 x 10^-6 /°C