Stainless steels
FERVEO INX 309LMo MIG
solid wireCatalogue only
also as: TIG rod
AWS class
ER 309LMo
EN ISO class
G/W 23 12 2 L
Hardness
210 HB
Classification
| AWS class | ER 309LMo |
|---|---|
| EN ISO class | G/W 23 12 2 L |
| Material no. (W.-Nr.) | 1.4459 |
Purpose
- Low-carbon Cr-Ni-Mo 22/14/2.6 solid wire, for joining unalloyed/low-alloy steel to corrosion-resistant stainless steel.
Why it works
Adds molybdenum (2.6%) to the 309LSi base — same intermediate-layer and dissimilar-steel joining role, with higher corrosion resistance than the Mo-free variant.
Fields of application
- Joining unalloyed or low-alloy steel to corrosion-resistant stainless steel.
- Intermediate layers in dissimilar-steel joining.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.02 |
| Cr | 22 |
| Mn | 1.5 |
| Mo | 2.6 |
| Ni | 14 |
| Si | 0.35 |
Mechanical properties
| Tensile strength (Rm) | 600 MPa |
|---|---|
| Yield strength (Rp0.2) | 480 MPa |
| Elongation (A5) | 30 % |
| Impact energy (KV) | 65 J |
| Hardness | 210 HB |
| Service temperature | −10 … 300 °C |
Process
| Polarity | DC+ |
|---|---|
| Shielding gas | M12,M13 |
Sizes and part numbers
| Ø | Request |
|---|---|
| 0.8 mm | |
| 1 mm | |
| 1.2 mm | |
| 1.6 mm |
Supply programme
spools C300 / D100 / D200 / K200 / K300
Cross-reference
| Replaces INERTFIL 309LMo (Oerlikon) | Direct replacement |
Equivalence refers to the classification (AWS / EN ISO), not to product identity. In applications with a qualified procedure (WPS), validate the substitution before use.
Advantages
- Additional molybdenum (2.6%) — higher corrosion resistance than INX 309LSi.
- Weldable in MIG/MAG and also in TIG.
Limitations
- High ferrite content in the deposit: risk of sigma-phase embrittlement under sustained exposure at 600–900°C — not recommended for critical structures in that range.