ER308L
Low-carbon austenitic stainless steel welding wire — the standard filler for joining 304 and 304L stainless steels. The L (low carbon ≤0.03%) prevents sensitization and intergranular corrosion in the heat-affected zone. Used for TIG (GTAW) and MIG (GMAW) with pure argon or Ar/CO2 shielding. Produces fully austenitic-ferritic weld metal with 5-15 FN (Ferrite Number) for crack resistance. Used for food processing equipment, chemical tanks, pharmaceutical vessels, and architectural stainless fabrication.
Chemical composition comparison (wt%)
Side-by-side: ER308L (AWS) (AWS A5.9) vs ASTM
| Element | ER308L (AWS) | ASTM | Overlap |
|---|---|---|---|
| C | ≤ 0.03% | — | — |
| Si | 0.3–0.65% | — | — |
| Mn | 1–2.5% | — | — |
| P | ≤ 0.03% | — | — |
| S | ≤ 0.03% | — | — |
| Cr | 19.5–22% | — | — |
| Mo | ≤ 0.75% | — | — |
| Ni | 9–11% | — | — |
| Cu | ≤ 0.75% | — | — |
Mechanical properties
As-Welded
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ≥ 520 | MPa |
| Yield Strength | ≥ 320 | MPa |
| Elongation | ≥ 35 | % |
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