About ER 309 Mig Wire

ER 309 MIG wire is a solid stainless steel filler metal designed for welding dissimilar alloys, including austenitic stainless steels to carbon or low-alloy steels. It provides excellent strength, corrosion resistance, and crack resistance, making it suitable for various industrial applications requiring robust welds.

ER 309 Mig Wire Chemical Compositions:

The chemical composition of ER 309 MIG wire includes:

  • Carbon (C): 0.08% max
  • Silicon (Si): 0.30-0.65%
  • Manganese (Mn): 1.0-2.5%
  • Phosphorus (P): 0.03% max
  • Sulphur (S): 0.03% max
  • Chromium (Cr): 22.0-25.0%
  • Nickel (Ni): 12.0-14.0%

These elements contribute to its weldability and corrosion resistance, essential for various welding applications.

ER 309 Mig Wire Physical Properties:

  • Density: Typically around 7.9 g/cm³, providing insight into mass per unit volume.
  • Melting Point: Approximately 1400-1450°C (2552-2642°F), indicating solid to liquid transition temperature.
  • Electrical Conductivity: High, facilitating efficient welding processes.
  • Thermal Conductivity: Moderate, ensuring effective heat transfer during welding.
  • Ductility: Exhibits good ductility, allowing for flexibility in welding applications.
  • Magnetic Properties: Typically non-magnetic in the annealed condition, minimizing interference.
  • Corrosion Resistance: Offers excellent resistance to corrosion, maintaining weld integrity in various environments.

ER 309 Mig Wire Mechanical Properties:

  • Tensile Strength: Typically ranging from 620 to 720 MPa, indicating maximum load capacity before breaking.
  • Yield Strength: Typically around 380 to 420 MPa, representing the stress level for permanent deformation onset.
  • Elongation: Typically 35% to 45%, demonstrating the ability to stretch without breaking.
  • Hardness: Varies depending on welding conditions and heat treatment.
  • Impact Toughness: Reflects the ability to absorb energy during impact without fracturing.
  • Fatigue Strength: Indicates resistance to failure under repeated loading.
  • Microstructure: Typically austenitic, contributing to corrosion resistance and mechanical properties.

ER 309 Mig Wire Applications:

  • Dissimilar Metal Welding: Used for welding stainless steel to carbon or low-alloy steels in various industries.
  • Chemical Processing: Ideal for fabricating equipment and pipelines requiring corrosion resistance.
  • Power Generation: Applied in welding components for power plants, ensuring strength and corrosion resistance.
  • Petrochemical Industry: Utilized for welding equipment in harsh environments requiring corrosion resistance.
  • Pressure Vessels: Used in the fabrication of pressure vessels requiring high strength and corrosion resistance.
  • Heat Exchangers: Applied in welding components for heat exchangers due to its corrosion resistance and thermal conductivity.
  • Maintenance and Repair: Suitable for repairing stainless steel equipment and machinery across different sectors.