Stainless steels
FERVEO INX 309Mo R 17
covered electrode · stick electrodeCatalogue only
also as: covered electrode · stick electrode
AWS class
E 309LMo-17
EN ISO class
E 23 12 2 L R 32
Tensile strength (Rm)
620–750 MPa
Classification
| AWS class | E 309LMo-17 |
|---|---|
| EN ISO class | E 23 12 2 L R 32 |
Purpose
- Same Cr-Ni-Mo 23/13/2.8 class as INX 309Mo R 16, -17 coating variant — buffer layer and dissimilar-steel joining with higher hot strength.
Why it works
Same core as INX 309Mo R 16; the added molybdenum gives higher hot strength than the 309L family, with the same buffer-layer role and joining of stainless to mild or low-alloy steel.
Fields of application
- Joining corrosion-resistant stainless steel to mild or low-alloy steel, dissimilar steels, clad steels.
- Buffer layer before cladding with any stainless electrode.
Chemical composition
| Element | Typical, % |
|---|---|
| C | ≤ 0.03 |
| Cr | 23 |
| Mn | 0.8 |
| Mo | 2.8 |
| Ni | 13 |
| Si | 0.7 |
Mechanical properties
| Tensile strength (Rm) | 620–750 MPa |
|---|---|
| Yield strength (Rp0.2) | 490 MPa |
| Elongation (A5) | 30 % |
| Impact energy (KV) | 47 J (20 °C) |
Process
| Polarity | DC+/AC |
|---|---|
| Positions | PAflatPBhorizontal-verticalPChorizontalPDhorizontal-overheadPEoverheadPFvertical-up |
| Re-drying | 120–200 °C / ≥2 h |
Sizes and part numbers
| Ø | Length | Current | Request |
|---|---|---|---|
| 2.5 mm | 250 mm | 60–90 A | |
| 3.2 mm | 350 mm | 80–120 A | |
| 4 mm | 350 mm | 100–160 A |
Cross-reference
| Replaces OK 67.70 (ESAB) | Direct replacement |
| Replaces Arosta 309Mo (Lincoln) | Direct replacement |
| Replaces EI 309MoL (Magmaweld) | Direct replacement |
| Replaces SUPRANOX RS 309LMo (Oerlikon) | Direct replacement |
| Replaces 24/12Mo (Selectarc) | 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.
Base metals
Uses in high strength unalloyed and heat-treatable steelsferritic / austenitic steelsaustenitic Mn steels.
Advantages
- High ferrite content — good cracking resistance with problematic steels.
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.