About ER 308 Tig Wire

ER 308 TIG wire is a stainless steel filler metal used in TIG welding. It is primarily used for welding similar alloys, such as 304 and 304L stainless steel. Known for its excellent corrosion resistance and high-temperature performance, it produces strong, durable welds in various applications.

ER 308 Tig Wire Chemical Compositions:

The chemical composition of ER 308 TIG wire includes:-

  • Carbon (C):08% max
  • Manganese (Mn):00-2.50%
  • Silicon (Si):30-0.65%
  • Chromium (Cr):50-21.00%
  • Nickel (Ni):00-11.00%
  • Phosphorus (P):03% max
  • Sulfur (S):03% max
  • Copper (Cu):75% max

ER 308 Tig Wire Physical Properties:

The physical properties of ER 308 TIG wire include:-

  • Density: Approximately 7.9 g/cm³. This high density is typical of stainless steel, contributing to its strength and durability.
  • Melting Point: Around 1400°C (2552°F). The high melting point ensures stability and performance in high-temperature applications.
  • Tensile Strength: Typically around 600-700 MPa. This indicates the wire’s ability to withstand high stress before breaking.
  • Yield Strength: Approximately 300 MPa. This measures the stress at which the wire begins to deform plastically.
  • Elongation: About 30-35%. This indicates the wire’s ductility, reflecting its ability to stretch without breaking.
  • Electrical Resistivity: Approximately 0.72 µΩ·m. This property affects the wire’s electrical conductivity, relevant in welding processes.
  • Thermal Conductivity: Around 16.3 W/m·K. This moderate thermal conductivity ensures efficient heat distribution during welding.

ER 308 Tig Wire Mechanical Properties:

The mechanical properties of ER 308 TIG wire include:-

  1. Tensile Strength: Typically around 600-700 MPa, indicating the wire’s ability to withstand high levels of stress before failing.
  2. Yield Strength: Approximately 300 MPa, which measures the stress at which the wire begins to deform permanently.
  3. Elongation: About 30-35%, reflecting the wire’s ductility and ability to stretch significantly before breaking.
  4. Hardness: Around 160-190 HV (Vickers Hardness), which signifies the resistance of the wire to indentation and wear.
  5. Impact Strength: Exhibits good toughness, especially at cryogenic temperatures, ensuring reliable performance in various environmental conditions.
  6. Fatigue Strength: High resistance to cyclic loading, which is crucial for applications involving repeated stress cycles.
  7. Corrosion Resistance: Excellent, especially in oxidizing environments, due to the high chromium and nickel content, making it suitable for use in harsh conditions.

ER 308 Tig Wire Applications:

ER 308 TIG wire is used in a variety of applications due to its excellent mechanical and corrosion-resistant properties. Common applications include:-

  1. Welding Austenitic Stainless Steels: Ideal for welding 304 and 304L stainless steels.
  2. Food and Beverage Industry: Used in equipment that requires hygienic and corrosion-resistant welds.
  3. Chemical Processing: Suitable for fabricating and repairing chemical tanks, pipes, and heat exchangers.
  4. Automotive Industry: Applied in the manufacture and repair of exhaust systems and other components exposed to high temperatures.
  5. Petrochemical Industry: Used for welding pipes, tanks, and pressure vessels that handle corrosive substances.
  6. Pharmaceutical Equipment: Ensures clean, non-reactive welds in equipment for drug manufacturing.
  7. Power Generation: Employed in the construction and maintenance of boilers and heat recovery systems.
  8. Architectural Applications: Used in structural components and decorative features due to its aesthetic appeal and durability.