Stainless steels
FERVEO INX 29-9 TIG
TIG rodCatalogue only
also as: solid wire
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
- TIG variant of the Cr-Ni 30/9 INX 29-9 wire/rod — same service for joining dissimilar steels, manganese steel and tool surfacing.
Why it works
Same alloy as INX 29-9 MIG, in rod form for TIG (DC-, I1 gas) — fine weld-pool control for root passes and critical transitions.
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 | I1 |
Sizes and part numbers
| Ø | Request |
|---|---|
| 1 mm | |
| 1.6 mm | |
| 2.4 mm | |
| 3.2 mm |
Supply programme
boxes 10 kg
Cross-reference
| Replaces TI 312 (Magmaweld) | Direct replacement |
| Replaces NIC 312 (Nicrotec) | 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.
- Precise weld-pool control for root passes and critical transitions.
Limitations
- Its versatility is for joining dissimilar or unknown-composition steels — not a general-purpose corrosion-resistant stainless.
- 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.