Stainless steels
FERVEO INX 29-9 MIG
solid wireCatalogue only
also as: TIG rod
AWS class
ER 312
EN ISO class
G/W 29 9
Tensile strength (Rm)
740 MPa
Classification
| AWS class | ER 312 |
|---|---|
| EN ISO class | G/W 29 9 |
| Material no. (W.-Nr.) | 1.4337 |
Purpose
- High-alloy Cr-Ni 30/9 wire/rod (AWS ER312-type) — joining dissimilar steels, manganese steel, and surfacing hot-working tools.
Why it works
The combination of high chromium (30%) and moderate nickel (9%) produces an austenitic-ferritic microstructure highly tolerant of dilution, making it suited as an intermediate layer and for joining difficult steel combinations (dissimilar steels, manganese steel, cast steels), with good resistance to cavitation and thermal cracking.
Fields of application
- DIN 1.4085, 1.4762 and equivalents; joining dissimilar steel, manganese steel and cast steels; surfacing and intermediate layers on hot-working tools.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.12 |
| Cr | 30 |
| Mn | 1.8 |
| Ni | 9 |
| Si | 0.4 |
Mechanical properties
| Tensile strength (Rm) | 740 MPa |
|---|---|
| Yield strength (Rp0.2) | 560 MPa |
| Elongation (A5) | 25 % |
| Service temperature | −60 … 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 D100 / D200 / K200 / K300
Cross-reference
| Replaces MI 312 (Magmaweld) | Direct replacement |
| Replaces UTP A 651 (UTP) | 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
1.40851.4762
Advantages
- High ferrite content in the deposit: excellent resistance to hot cracking, even when diluted by difficult, dissimilar, or unknown-composition steels.
- Combines high mechanical strength with good ductility — tolerates dilution without embrittling.
- Suited as an intermediate layer and for joining austenitic manganese steel, cast steels, and hot-working tool steels.
- Stable, clean weld pool in both MIG and TIG.
Limitations
- Its versatility is for joining dissimilar or unknown-composition steels — not a general-purpose corrosion-resistant stainless (see INX 308/316).
- Risk of sigma-phase embrittlement under sustained exposure at 600–900°C — not recommended for critical structures in that service range.
- Its thermal expansion coefficient differs from carbon steel; on heavy sections or rigidly clamped parts this can add thermal stress.
- The elevated ferrite content raises the ductile-to-brittle transition temperature — not suited to cryogenic service (e.g. LNG).