Stainless steels
FERVEO INX 309Mo R 16
covered electrode · stick electrodeCatalogue only
also as: covered electrode · stick electrode
AWS class
E 309LMo-16
EN ISO class
E 23 12 2 L R 32
Tensile strength (Rm)
700 MPa
Classification
| AWS class | E 309LMo-16 |
|---|---|
| EN ISO class | E 23 12 2 L R 32 |
Purpose
- Cr-Ni-Mo 23/13/2.8 rutile electrode (E 309LMo-16), for hot service and overlay/buffer layers on similar ferritic and austenitic steels.
Why it works
Adds molybdenum (2.8%) to the 309L base — raises strength for high-strength and heat-resistant steels, including high-temperature pressure vessels; the deposit keeps the 309 family's high ferrite content and good cracking resistance.
Fields of application
- High-strength unalloyed and alloyed steels, heat-resistant steels, high-temperature pressure vessels.
- Build-up or overlay, buffer layers, corrosion- and heat-resistant steels.
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) | 700 MPa |
|---|---|
| Yield strength (Rp0.2) | 530 MPa |
| Elongation (A5) | 35 % |
| Impact energy (KV) | 55 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
High strength unalloyed and alloyed steelsheat resistant steelsferritic and austenitic steelsTS EN ISO 3581-A : E 23 12 2 L R 32EN ISO 3581-A : E 23 12 2 L R 32AWS A5.4 : E 309LMo-16
Advantages
- High ferrite content — good cracking resistance.
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.