About ER 309LSi Sub Arc Wire

ER 309LSi Sub Arc Wire is a stainless steel welding wire with added silicon for improved fluidity and weld bead appearance. It offers high corrosion resistance and is suitable for welding dissimilar metals like stainless steel to mild steel, commonly used in fabrication and structural applications.

ER 309LSi Sub Arc Wire Chemical Compositions:

ER 309LSi Sub Arc Wire typically contains the following chemical compositions:

  • Carbon (C): 0.03% max
  • Manganese (Mn): 1.0-2.5%
  • Silicon (Si): 0.65-1.00%
  • Phosphorus (P): 0.03% max
  • Sulphur (S): 0.03% max
  • Chromium (Cr): 22.0-25.0%
  • Nickel (Ni): 12.0-14.0%
  • Molybdenum (Mo): 0.75% max

The addition of silicon enhances fluidity during welding and improves weld bead appearance.

ER 309LSi Sub Arc Wire Physical Properties:

ER 309LSi Sub Arc Wire possesses the following physical properties:

  1. Density: Approximately 7.9 g/cm³, similar to other stainless steel alloys.
  2. Melting Point: Typically between 1350-1400°C (2460-2550°F), ensuring stability during welding.
  3. Electrical Resistivity: Around 0.74 µΩ·m, facilitating efficient electrical conductivity during welding.
  4. Thermal Conductivity: About 15 W/m·K, aiding in heat dissipation and maintaining uniform weld temperatures.
  5. Coefficient of Thermal Expansion: Moderate, ensuring minimal distortion and stress in welded components.
  6. Magnetic Properties: Generally non-magnetic in the annealed condition, suitable for applications requiring non-magnetic properties.
  7. Corrosion Resistance: High resistance to corrosion, suitable for use in aggressive environments such as chemical processing or marine applications.

These properties collectively make ER 309LSi Sub Arc Wire well-suited for various welding applications requiring high-quality, corrosion-resistant welds with excellent appearance.

ER 309LSi Sub Arc Wire Mechanical Properties:

ER 309LSi Sub Arc Wire exhibits the following mechanical properties:

  1. Tensile Strength: Typically between 600-700 MPa, providing excellent strength for welded joints.
  2. Yield Strength: Generally ranging from 300-450 MPa, indicating the stress level at which the material begins to deform plastically.
  3. Elongation: Typically around 35-45%, indicating the extent to which the material can stretch before failure.
  4. Hardness: Often in the range of 170-200 HB (Brinell hardness), reflecting its resistance to indentation or penetration.
  5. Impact Toughness: Good impact resistance, enabling it to withstand sudden loading or shock without fracturing.
  6. Fatigue Strength: Exhibits a high resistance to fatigue failure, suitable for cyclically loaded applications.
  7. Ductility: Demonstrates good ductility, enabling it to deform without fracturing under tensile stress, crucial for forming and shaping processes.

These mechanical properties ensure ER 309LSi Sub Arc Wire delivers reliable performance in various welding operations.

ER 309LSi Sub Arc Wire Applications:

ER 309LSi Sub Arc Wire finds applications in various industries, including:

  1. Petrochemical: Welding of stainless steel components in chemical processing plants.
  2. Food Processing: Fabrication of equipment and machinery for food and beverage production.
  3. Pharmaceutical: Welding of stainless steel vessels and piping in pharmaceutical manufacturing.
  4. Automotive: Welding of exhaust systems and components requiring corrosion resistance.
  5. Aerospace: Fabrication of components for aircraft and spacecraft.
  6. Power Generation: Welding of boiler tubes, turbines, and heat exchangers in power plants.
  7. Construction: Fabrication of architectural structures, bridges, and other infrastructure requiring corrosion-resistant welds.

These applications benefit from ER 309LSi Sub Arc Wire’s high corrosion resistance and versatility in welding dissimilar metals.