Stainless steels
FERVEO INX 312
covered electrode · stick electrodeCatalogue only
also as: solid wireTIG rod
AWS class
~E 312-16
EN ISO class
E 29 9 R 12
Tensile strength (Rm)
700–830 MPa
Classification
| AWS class | ~E 312-16 |
|---|---|
| EN ISO class | E 29 9 R 12 |
Purpose
- High-strength Cr-Ni 30/10.5 rutile electrode (~E 312-16) — built for joint welding and repair between dissimilar steels, including sprocket and wheel-shaft repair.
Why it works
The high chromium content (30%) compared with the rest of the stainless family gives a high-strength ferritic-austenitic deposit especially tolerant of dilution when welding onto steel of unknown composition — hence its typical use in repair work.
Fields of application
- Joint welding of tool steels and dissimilar steels.
- Repair welding of sprockets and wheel shafts.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.12 |
| Cr | 30 |
| Mn | 0.8 |
| Ni | 10.5 |
| Si | 1 |
Mechanical properties
| Tensile strength (Rm) | 700–830 MPa |
|---|---|
| Yield strength (Rp0.2) | 490 MPa |
| Elongation (A5) | 20 % |
| Impact energy (KV) | 24 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 | 50–80 A | |
| 3.2 mm | 300 mm | 80–110 A | |
| 3.2 mm | 350 mm | 80–110 A | |
| 4 mm | 350 mm | 110–160 A |
Cross-reference
| Replaces EutecTrode E312-17 (Castolin) | Direct replacement |
| Replaces OK 68.81 (ESAB) | Direct replacement |
| Replaces Limarosta 312 (Lincoln) | Direct replacement |
| Replaces EI 312 (Magmaweld) | Direct replacement |
| Replaces AS P-312 (Askaynak) | Direct replacement |
| Replaces NIC 312 (Nicrotec) | Direct replacement |
| Replaces SUPRANOX RS 312 (Oerlikon) | Direct replacement |
| Replaces WA TETRA V 312-E (Welding Alloys) | 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
- High ferrite content in the deposit: good resistance to hot cracking when welding onto unknown-composition or highly dissimilar steels.
- Deposit resistant to corrosion, cracking, and rust.
- High mechanical strength, well above a conventional austenitic stainless.
- Rutile coating: easy arc handling — a good choice for field repair work.
Limitations
- Its versatility is for joining and repairing dissimilar or unknown-composition steels — not a general-purpose corrosion-resistant stainless.
- Risk of sigma-phase embrittlement under sustained exposure in the 600–900°C range — not recommended for critical structures in that range.
- The high ferrite content limits low-temperature toughness — not an electrode intended for cryogenic service.
- Its thermal expansion coefficient differs from carbon steel; on heavy sections or rigidly clamped parts this can add thermal stress.