Duplex
FERVEO DPX 2594 TIG
TIG rodCatalogue only
AWS class
ER 2594
EN ISO class
G/W 25 9 4 N L
Tensile strength (Rm)
750 MPa
Classification
| AWS class | ER 2594 |
|---|---|
| EN ISO class | G/W 25 9 4 N L |
| Material no. (W.-Nr.) | 1.4501 |
Purpose
- TIG variant of the super duplex 25Cr-9Ni-3.7Mo-N DPX 2594 wire/rod — same service for offshore and seawater applications, for root passes and precision welds.
Why it works
Same alloy as FERVEO DPX 2594 MIG, in rod form for TIG (DC-, I1 gas) — fine weld-pool control, useful for root passes where the ferrite/austenite balance of the first pass is harder to control.
Fields of application
- Super duplex steel 1.4410, 1.4515, 1.4517, 1.4573, 1.4593 and equivalents.
- Root passes and precision welds in offshore and seawater applications.
Chemical composition
| Element | Typical, % |
|---|---|
| C | 0.02 |
| N | 0.2 |
| Cr | 25 |
| Cu | 0.1 |
| Mn | 0.8 |
| Mo | 3.7 |
| Ni | 9 |
| Si | 0.5 |
Mechanical properties
| Tensile strength (Rm) | 750 MPa |
|---|---|
| Yield strength (Rp0.2) | 600 MPa |
| Elongation (A5) | 25 % |
| Impact energy (KV) | 80 J |
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 5 kg · rods 1–3 mm × 1000 mm
Cross-reference
| Replaces OK Tigrod 2509 (ESAB) | Requires WPS validation |
| Replaces Exaton 25.10.4.L (Exaton) | Requires WPS validation |
| Replaces INERTROD 25 10 4 (Oerlikon) | Requires WPS validation |
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
1.44101.45151.45171.45731.4593
Advantages
- High resistance to pitting and stress-corrosion cracking in seawater — superior to a standard duplex (2209).
- Precise weld-pool control — suited to root passes where the first pass's phase balance is critical.
- Good resistance in caustic alkalis and phosphoric acid.
Limitations
- The ferrite/austenite phase balance is more heat-input-sensitive than a standard duplex — requires stricter interpass temperature control.
- Higher risk of sigma-phase embrittlement under sustained exposure in the 300–1000°C range than a standard duplex — not suited to continuous service in that range.