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316L Stainless Steel (UNS S31603)

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    • Introduction to 316L Steel (ASTM A240, ASTM A276, ISO 5832-1):

    316L stainless steel is a low-carbon version of 316 stainless steel, widely known for its excellent resistance to corrosion, particularly in chloride-rich and acidic environments. The “L” in 316L stands for “Low Carbon,” which minimizes the risk of carbide precipitation during welding, thereby improving resistance to intergranular corrosion. It is an austenitic stainless steel, meaning it has a face-centered cubic (FCC) structure, giving it superior toughness, formability, and weldability. 316L is commonly used in industries that require resistance to harsh environments, such as in the chemical, pharmaceutical, marine, and medical sectors.

    Features:

    • Excellent Corrosion Resistance: 316L offers superior resistance to pitting, crevice corrosion, and general corrosion, especially in chloride environments (e.g., seawater) and in acidic conditions (e.g., sulfuric and phosphoric acids).
    • Low Carbon Content: The low carbon content (0.03% max) reduces the potential for carbide precipitation during welding, improving its resistance to intergranular corrosion after welding.
    • Biocompatibility: 316L is widely used for medical implants and surgical instruments due to its biocompatibility, meaning it is non-reactive with body tissues and fluids.
    • Weldability: 316L can be easily welded using conventional methods, such as TIG, MIG, and laser welding, making it highly suitable for complex fabrications.
    • Non-Magnetic: 316L is non-magnetic in the annealed condition, which is useful in applications where magnetic properties would be undesirable.
    • Good Formability: The material is highly formable and can be easily shaped into various products, including pipes, plates, and medical devices.
    • Strength and Durability: 316L maintains good strength, toughness, and fatigue resistance, even at elevated temperatures.

    Specifications:

    • ASTM A240: Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for General Applications.
    • ASTM A276: Standard Specification for Stainless Steel Bars and Shapes.
    • UNS S31603: Unified Numbering System for 316L stainless steel.
    • ISO 5832-1: Material specification for metallic materials used in medical devices, ensuring 316L is suitable for biomedical applications.
    Product Specification

    Composition of 316L Stainless Steel:

    Element Percentage
    Nickel (Ni) 10.0 – 14.0%
    Chromium (Cr) 16.0 – 18.0%
    Molybdenum (Mo) 2.0 – 3.0%
    Iron (Fe) Balance
    Carbon (C) 0.03% Max
    Manganese (Mn) 2.0% Max
    Silicon (Si) 1.0% Max
    Phosphorus (P) 0.045% Max
    Sulfur (S) 0.03% Max

    Physical Properties:

    Property Value
    Density 8.0 g/cm³
    Melting Point 1375–1400°C (2500–2550°F)
    Hardness (Rockwell B) 85-95 HRB
    Tensile Strength 520 MPa (75,000 psi)
    Yield Strength 210 MPa (30,500 psi)
    Elongation 40%
    Modulus of Elasticity 200 GPa
    Thermal Conductivity 16.3 W/m·K
    Coefficient of Thermal Expansion 16.5 × 10⁻⁶ /°C