What is the filler metal for 304L?

Why Filler Metal Selection Matters for SA 240 GR 304L

SA 240 GR 304L, known for its low carbon content (≤0.03%) and SS 304 non magnetic properties, is designed for superior weldability compared to SA 240 GR 304. The right filler metal ensures the weld matches the base metal’s corrosion resistance, mechanical properties, and SA 240 GR 304L density (8.00 g/cm³). Incorrect filler metals can lead to issues like corrosion or cracking. Gangsteel’s sa 240 gr 304l plates are optimized for welding applications.

Recommended Filler Metals for SA 240 GR 304L

The most commonly recommended filler metal for welding SA 240 GR 304L is ER308L or E308L, as specified by AWS (American Welding Society) standards. These fillers are tailored to match the chemical composition and properties of SA 240 GR 304L. Below are the details:

• ER308L (TIG/MIG Welding):
  • Composition: ~20% Cr, 10% Ni, ≤0.03% C (low carbon to prevent sensitization).
  • Use: Ideal for TIG (GTAW) and MIG (GMAW) welding of plat stainless 304 or SA 240 TP 304/304L.
  • Benefits: Maintains corrosion resistance, SS 304 non magnetic properties, and weld integrity in mild environments.
  • Applications: Food processing equipment, chemical tanks, and SA 240 GR 304 pipe.
• E308L (Stick Welding):
  • Composition: Similar to ER308L, with flux coating for SMAW (shielded metal arc welding).
  • Use: Suitable for thicker plates like plat SS 304 3mm or structural components.
  • Benefits: Easy to use in field welding, with good corrosion resistance.
• Alternative Fillers:
  • ER316L: Used when welding SA 240 GR 304L to SA 240 GR 316 for enhanced pitting resistance in chloride environments. Explore our sa 240 gr 316l.
  • ER309L: For dissimilar metal welding (e.g., 304L to carbon steel), offering higher alloy content for strength.

For detailed specs, refer to our SS 304 data sheet or sa 240 gr 304.

Why ER308L is Preferred

ER308L is the go-to filler for SA 240 GR 304L because:

• Low Carbon: Matches 304L’s ≤0.03% carbon, preventing carbide precipitation and intergranular corrosion.
• Corrosion Resistance: Aligns with 304L’s resistance to mild acids and atmospheric corrosion, unlike SA 240 GR 304H material, which requires different fillers.
• Mechanical Properties: Ensures welds meet SA 240 GR 304L’s tensile strength (≥485 MPa) and elongation (≥40%).
• Cost-Effectiveness: Competitive SS 304 plate price makes ER308L a practical choice compared to SS204 vs SS 304 fillers.

Welding Best Practices for SA 240 GR 304L

To achieve optimal welds with SA 240 GR 304L:

• Cleanliness: Remove contaminants from surfaces to avoid weld imperfections.
• Shielding Gas: Use argon or argon-helium mixes for TIG/MIG to prevent oxidation and maintain SS 304 non magnetic properties.
• Heat Control: Keep interpass temperatures below 150°C to avoid sensitization, especially for plate 2 mm SUS 304.
• Post-Weld Treatment: Passivate welds to restore corrosion resistance, particularly for SA 240 GR 304 pipe.

Gangsteel’s sa 240 gr 317l offers alternatives for harsher environments.

Comparing Filler Metals for Related Grades

• SA 240 GR 304: ER308 or E308 (higher carbon) is used, but ER308L is often preferred for dual-certified SA 240 TP 304/304L.
• SA 240 GR 316: ER316L is recommended for molybdenum content, increasing SS 304 steel price but improving pitting resistance.
• SA 240 GR 304H: ER308H or ER16-8-2 for high-temperature applications, unlike 304L’s focus on weldability.

For high-temperature needs, explore our sa 240 gr 304h.

Why Choose Gangsteel for SA 240 GR 304L?

Gangsteel supplies certified SA 240 GR 304L plates optimized for welding with ER308L filler metals. Our inventory includes custom sizes like plat SS 304 3mm and competitive SS 304 sheet price options. For welding guidance or to request a quote, visit our astm a 240 stainless plate page or email admin@gangsteel.com.