ERNiCrMo-3 – wire and rod for Inconel 625 and corrosion-resistant alloys
Ni-22Cr-9Mo-3.5Nb filler metal, one of the most versatile on the market: it welds alloy 625, 6 % Mo super-austenitics, Alloy 825, 9 % Ni steel and dissimilar joints in general.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ERNiCrMo-3 |
| Solid MIG/MAG wire (GMAW) | ERNiCrMo-3 |
| Covered electrode (SMAW) | ENiCrMo-3 – AWS A5.11 |
| Flux-cored wire (FCAW) | ENiCrMo3T1-1/-4 – AWS A5.34 |
| Submerged arc wire (SAW) | ERNiCrMo-3 + flux |
| Designation | Value |
|---|---|
| AWS | ERNiCrMo-3 |
| Specification | AWS A5.14/A5.14M / ASME SFA-5.14 |
| UNS | N06625 |
| Others | EN ISO 18274: S Ni 6625 (NiCr22Mo9Nb); W.Nr. 2.4831 |
| Trade designation | Liga 625 / Inconel 625 (designação de material) |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.10 |
| Cr | 20.0 – 23.0 |
| Mo | 8.0 – 10.0 |
| Nb + Ta | 3.15 – 4.15 |
| Fe | ≤ 5.0 |
| Ni | ≥ 58.0 |
| Mn | ≤ 0.50 |
| Si | ≤ 0.50 |
| Al | ≤ 0.40 |
| Ti | ≤ 0.40 |
| Cu | ≤ 0.50 |
| P | ≤ 0.02 |
| S | ≤ 0.015 |
Properties of the deposited metal
| Property | Value |
|---|---|
| Tensile strength of deposited metal | ≥ 760 MPa (AWS A5.11 minimum for ENiCrMo-3, reference) |
| Elongation | ≥ 30 % (AWS A5.11 minimum for ENiCrMo-3, reference) |
Materials welded with ERNiCrMo-3
- Inconel 625 / Alloy 625
- 254 SMO / F44
- Incoloy 825
- ASTM A522 Type I
- 904L stainless steel
- Alloy 28
- Alloy 20 (Carpenter 20)
Dissimilar joints: Widely used in joints of carbon or Cr-Mo steel with stainless, of stainless with nickel alloys, in cladding of carbon steel and on super-austenitics and super duplex when a bead nobler than the base metal is required.
Why the composition differs from the base metal
To weld 6 % Mo super-austenitics (such as 254) and Alloy 825, a filler metal much more highly alloyed than the plate is used. Molybdenum segregates in the bead and would leave depleted zones; starting from 9 % Mo in a nickel matrix, the bead is at least as pitting resistant as the base metal. On 9 % Ni steel, the choice is due to cryogenic toughness and a thermal expansion close to that of steel.
Welding precautions
- No preheating for nickel alloys and stainless; maximum interpass around 150 °C.
- The nickel alloy pool is viscous and penetrates little: use a wider bevel, a smaller root face and place the wire at the edge of the pool.
- TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead.
- On 9 % Ni steel, control the residual magnetism of the part (arc blow) and keep the heat input low.
Frequently asked questions
What is ERNiCrMo-3 used for?
Ni-22Cr-9Mo-3.5Nb filler metal, one of the most versatile on the market: it welds alloy 625, 6 % Mo super-austenitics, Alloy 825, 9 % Ni steel and dissimilar joints in general.
Why is the composition of ERNiCrMo-3 different from the material it welds?
To weld 6 % Mo super-austenitics (such as 254) and Alloy 825, a filler metal much more highly alloyed than the plate is used. Molybdenum segregates in the bead and would leave depleted zones; starting from 9 % Mo in a nickel matrix, the bead is at least as pitting resistant as the base metal. On 9 % Ni steel, the choice is due to cryogenic toughness and a thermal expansion close to that of steel.
Which covered electrode corresponds to ERNiCrMo-3?
ENiCrMo-3 – AWS A5.11.
What precautions apply when welding with ERNiCrMo-3?
No preheating for nickel alloys and stainless; maximum interpass around 150 °C. The nickel alloy pool is viscous and penetrates little: use a wider bevel, a smaller root face and place the wire at the edge of the pool. TIG with pure argon or argon-helium; argon root purge. Rigorous cleaning: oil, paint and markers contaminate the nickel alloy with sulfur and lead. On 9 % Ni steel, control the residual magnetism of the part (arc blow) and keep the heat input low.
