About ER 307si Tig Wire

ER 307Si TIG wire is a high-silicon austenitic stainless steel filler metal designed for welding in dissimilar stainless steel applications. It provides excellent corrosion resistance, improved mechanical properties, and superior weldability. Ideal for welding stainless steels to carbon steels, and for joining difficult-to-weld alloys.

ER 307Si Tig Wire Chemical Compositions:

The typical chemical composition of ER 307Si TIG wire is as follows:

  • Carbon (C):12% max
  • Silicon (Si):90-1.50%
  • Manganese (Mn):00-7.00%
  • Nickel (Ni):50-10.50%
  • Chromium (Cr):50-20.50%
  • Phosphorus (P):03% max
  • Sulfur (S):03% max
  • Copper (Cu):75% max

These elements provide a balance of strength, ductility, and corrosion resistance, making ER 307Si suitable for demanding welding applications.

ER 307Si Tig Wire Physical Properties:


  • Approximately 7.9 g/cm³
  • Ensures solid and robust weld joints

Melting Point:

  • Around 1400°C (2550°F)
  • Suitable for high-temperature applications

Tensile Strength:

  • Typically 600-700 MPa
  • Provides strong and durable welds

Yield Strength:

  • Approximately 400-450 MPa
  • Offers excellent resistance to deformation under stress


  • About 35-40%
  • Allows for flexibility and reduces the risk of cracking

Thermal Conductivity:

  • 15 W/m·K
  • Ensures efficient heat transfer during welding

Electrical Resistivity:

  • 75 µΩ·m
  • Indicates moderate electrical resistance

These properties make ER 307Si TIG wire an ideal choice for demanding welding tasks, balancing strength, flexibility, and resistance to high temperatures.

ER 307Si Tig Wire Mechanical Properties:

Tensile Strength:

  • Ranges from 600 to 700 MPa
  • Ensures strong and durable welds capable of withstanding high stress.

Yield Strength:

  • Typically between 400 and 450 MPa
  • Offers excellent resistance to permanent deformation under load.


  • Around 35% to 40%
  • Provides flexibility and ductility, reducing the risk of weld cracking.


  • Approximately 200 HB (Brinell Hardness)
  • Indicates a good balance between hardness and toughness.

These mechanical properties make ER 307Si TIG wire suitable for applications requiring robust, flexible, and reliable welds.

ER 307Si TIG Wire Application:

Dissimilar Metal Welding:

  • Ideal for welding austenitic stainless steels to carbon steels.
  • Ensures strong, corrosion-resistant joints between different metal types.

High-Manganese Steels:

  • Suitable for joining high-manganese steels.
  • Provides excellent mechanical properties and durability.

Cryogenic Applications:

  • Effective in low-temperature environments.
  • Maintains toughness and resistance to cracking at sub-zero temperatures.

Corrosion-Resistant Overlays:

  • Used for creating overlays on carbon steel surfaces.
  • Enhances the surface’s resistance to corrosion and wear.

General Maintenance and Repair:

  • Versatile for repairing machinery and equipment.
  • Adapts well to various welding conditions and materials.

These applications highlight ER 307Si TIG wire’s versatility, making it a valuable choice for numerous industrial and maintenance tasks.