About ER 309L Sub Arc Wire

ER 309L Sub Arc Wire is a low-carbon stainless steel welding wire used in submerged arc welding (SAW). It offers excellent corrosion resistance and is ideal for welding similar or dissimilar metals, particularly stainless to mild steel, and for overlay applications, reducing carbide precipitation and intergranular corrosion.

ER 309L Sub Arc Wire Chemical Compositions:

ER 309L Sub Arc Wire typically has the following chemical composition:

  • Carbon (C): 0.03% max
  • Manganese (Mn): 1.0-2.5%
  • Silicon (Si): 0.30-0.65%
  • Phosphorus (P): 0.03% max
  • Sulphur (S): 0.03% max
  • Chromium (Cr): 23.0-25.0%
  • Nickel (Ni): 12.0-14.0%
  • Molybdenum (Mo): 0.75% max

These elements provide excellent corrosion resistance and reduce carbide precipitation.

ER 309L Sub Arc Wire Physical Properties:

ER 309L Sub Arc Wire exhibits the following physical properties:

  1. Density: Typically around 7.9 g/cm³, similar to other stainless steels.
  2. Melting Point: Approximately 1350-1400°C (2460-2550°F), ensuring stability during welding.
  3. Tensile Strength: Generally 550-650 MPa, offering good strength for welding applications.
  4. Yield Strength: Typically 275-400 MPa, indicating its ability to withstand deformation under load.
  5. Elongation: Around 35-45%, showing its ductility, allowing for deformation before fracture.
  6. Electrical Resistivity: Approximately 0.74 µΩ·m, important for electrical conductivity in welding processes.
  7. Thermal Conductivity: About 15 W/m·K, ensuring efficient heat transfer during welding, aiding in uniform melting and fusion.

These properties make ER 309L Sub Arc Wire suitable for a wide range of welding applications, especially where corrosion resistance, strength, and ductility are essential.

ER 309L Sub Arc Wire Mechanical Properties:

ER 309L Sub Arc Wire typically exhibits the following mechanical properties:

  1. Tensile Strength: Generally around 550-650 MPa, providing good strength for welded joints.
  2. Yield Strength: Typically 275-400 MPa, indicating the point at which permanent deformation begins.
  3. Elongation: Approximately 35-45%, demonstrating its ductility and ability to deform before fracturing.
  4. Hardness: Varies depending on welding parameters, typically within 160-190 HB (Brinell hardness).
  5. Impact Toughness: Usually good, with impact strength typically above 27 J at -20°C.
  6. Modulus of Elasticity: Approximately 200 GPa, indicating its ability to return to its original shape after deformation.
  7. Reduction of Area: Typically around 45-60%, representing the extent of localized deformation before fracture.

These mechanical properties ensure that ER 309L Sub Arc Wire produces welds with adequate strength, ductility, and toughness, making it suitable for various welding applications.

ER 309L Sub Arc Wire Applications:

ER 309L Sub Arc Wire finds applications in diverse industries including:

  1. Chemical Processing: Fabrication of reactors, vessels, and piping.
  2. Petrochemical: Construction and maintenance of refineries and petrochemical plants.
  3. Food and Beverage: Welding equipment for sanitary processing.
  4. Power Generation: Welding components for boilers, turbines, and heat exchangers.
  5. Marine: Welding marine equipment and structures exposed to harsh environments.
  6. Construction: Joining stainless to carbon steel in structural elements.
  7. Automotive: Welding exhaust systems and components requiring corrosion resistance.