About ER 309 Sub Arc Wire

ER 309 Sub Arc Wire is a stainless steel welding wire used primarily for submerged arc welding (SAW) applications. It is ideal for welding similar or dissimilar metals, especially stainless to mild steel, offering excellent corrosion resistance and high-temperature strength, making it suitable for a variety of industrial applications.

ER 309 Sub Arc Wire Chemical Compositions:

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

  • Carbon (C): 0.08% max
  • Manganese (Mn): 2.0% max
  • Silicon (Si): 1.0% max
  • Phosphorus (P): 0.03% max
  • Sulfur (S): 0.03% max
  • Chromium (Cr): 22.0-24.0%
  • Nickel (Ni): 12.0-14.0%
  • Molybdenum (Mo): 0.75% max

These elements contribute to its excellent corrosion resistance and strength.

ER 309 Sub Arc Wire Physical Properties:

ER 309 Sub Arc Wire has the following physical properties:

  1. Density: Approximately 7.9 g/cm³
  2. Melting Point: Around 1350-1400°C (2460-2550°F)
  3. Tensile Strength: Typically about 600-700 MPa
  4. Yield Strength: Approximately 300-450 MPa
  5. Elongation: Around 35-45%
  6. Electrical Resistivity: Approximately 0.74 µΩ·m
  7. Thermal Conductivity: About 15 W/m·K

These properties make ER 309 Sub Arc Wire suitable for demanding welding applications requiring high strength and resistance to heat and corrosion.

ER 309 Sub Arc Wire Mechanical Properties:

ER 309 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: Generally good impact resistance, allowing it to withstand sudden loading or shock without fracturing.
  6. Fatigue Strength: Exhibits a high resistance to fatigue failure, making it suitable for cyclically loaded applications.
  7. Ductility: Demonstrates good ductility, enabling it to deform without fracturing under tensile stress, which is crucial for forming and shaping processes.

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

ER 309 Sub Arc Wire Applications:

ER 309 Sub Arc Wire is used in various industrial applications, including:

  1. Dissimilar Metal Welding: Joining stainless steel to mild or low-alloy steels.
  2. Overlay Welding: Creating a corrosion-resistant layer on carbon steel or low-alloy steel surfaces.
  3. Fabrication of Chemical Processing Equipment: Suitable for constructing tanks, pipes, and reactors.
  4. Petrochemical Industry: Used in the production and maintenance of refineries and petrochemical plants.
  5. Power Generation: Welding components exposed to high temperatures and harsh environments.
  6. Food Processing Equipment: Ensuring corrosion-resistant welds in sanitary environments.
  7. Marine Applications: Welding parts exposed to saltwater and harsh marine conditions.