Stainless steels
FERVEO INX 254 TIG
TIG rodCatalogue only
also as: solid wire
AWS class
~254SMO
EN ISO class
EN: X1 CrNiMoCuN20-18-7 .
Classification
| AWS class | ~254SMO |
|---|---|
| EN ISO class | EN: X1 CrNiMoCuN20-18-7 . |
| Material no. (W.-Nr.) | 1.4547 |
Purpose
- Super-austenitic Cr-Ni-Mo-N 20/18/6 solid TIG rod, high molybdenum and nitrogen — very high resistance to pitting, crevice corrosion and stress corrosion, designed for seawater service.
Why it works
The high molybdenum content (6.3%) directly drives superior resistance to pitting and crevice corrosion in halide-containing media (seawater); added nitrogen also raises mechanical strength above most standard austenitic grades. The manufacturer itself notes that, due to its stable austenitic structure, it can be somewhat more sensitive to hot cracking — recommends using the lowest heat input possible.
Fields of application
- DIN 1.4547 (254 SMO-type super-austenitic stainless steel); chemical industry; seawater desalination plants.
Chemical composition
| Element | Typical, % |
|---|---|
| C | ≤ 0.02 |
| N | 0.2 |
| Cr | 19.9 |
| Cu | 0.6 |
| Mn | 0.7 |
| Mo | 6.3 |
| Ni | 17.9 |
| Si | 0.5 |
Mechanical properties
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 · TIG cold wire D100
Base metals
Alloy 254
Advantages
- Very high pitting and crevice corrosion resistance in seawater.
- Higher mechanical strength than most standard austenitic grades, thanks to nitrogen.
- Good stress-corrosion resistance.
Limitations
- Stable austenitic structure with some hot-cracking sensitivity — use the lowest heat input possible.