ERNiCrMo-7 – wire and rod for Hastelloy C-4
Ni-16Cr-16Mo filler metal with titanium, for alloy C-4, chosen when the equipment spends long periods at temperatures of 650 to 1040 °C without losing corrosion resistance.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ERNiCrMo-7 |
| Solid MIG/MAG wire (GMAW) | ERNiCrMo-7 |
| Covered electrode (SMAW) | ENiCrMo-7 – AWS A5.11 |
| Designation | Value |
|---|---|
| AWS | ERNiCrMo-7 |
| Specification | AWS A5.14/A5.14M / ASME SFA-5.14 |
| UNS | N06455 |
| Others | EN ISO 18274: S Ni 6455 (NiCr16Mo16Ti); W.Nr. 2.4611* |
| Trade designation | Liga C-4 / Hastelloy C-4 (designação de material) |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.015 |
| Cr | 14.0 – 18.0 |
| Mo | 14.0 – 18.0 |
| Ti | ≤ 0.70 |
| Fe | ≤ 3.0 |
| Co | ≤ 2.0 |
| W | ≤ 0.50 |
| Ni | Balance |
| Mn | ≤ 1.0 |
| Si | ≤ 0.08 |
| Cu | ≤ 0.50 |
| P | ≤ 0.04 |
| S | ≤ 0.03 |
Properties of the deposited metal
| Property | Value |
|---|---|
| Tensile strength of deposited metal | ≥ 690 MPa (AWS A5.11 minimum for ENiCrMo-7, reference) |
| Elongation | ≥ 25 % (AWS A5.11 minimum for ENiCrMo-7, reference) |
Materials welded with ERNiCrMo-7
Why the composition differs from the base metal
It follows the chemistry of C-4, but with carbon and silicon as low as possible and no significant tungsten. The idea is the same as in the base metal: remove the elements that form carbides and intermetallic phases, so that the bead stays stable even after exposure to high temperatures.
Welding precautions
- No preheating; interpass below 100–150 °C.
- Low heat input and narrow beads.
- TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
Frequently asked questions
What is ERNiCrMo-7 used for?
Ni-16Cr-16Mo filler metal with titanium, for alloy C-4, chosen when the equipment spends long periods at temperatures of 650 to 1040 °C without losing corrosion resistance.
Why is the composition of ERNiCrMo-7 different from the material it welds?
It follows the chemistry of C-4, but with carbon and silicon as low as possible and no significant tungsten. The idea is the same as in the base metal: remove the elements that form carbides and intermetallic phases, so that the bead stays stable even after exposure to high temperatures.
Which covered electrode corresponds to ERNiCrMo-7?
ENiCrMo-7 – AWS A5.11.
What precautions apply when welding with ERNiCrMo-7?
No preheating; interpass below 100–150 °C. Low heat input and narrow beads. TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
