ER383 – wire and rod for Alloy 28 (UNS N08028)
Super-austenitic 27Cr-31Ni-3.5Mo-1Cu filler metal, with a composition close to alloy N08028, for phosphoric and sulfuric acid equipment and well tubing with H2S.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ER383 |
| Solid MIG/MAG wire (GMAW) | ER383 |
| Covered electrode (SMAW) | E383-16/-17 – AWS A5.4 |
| Designation | Value |
|---|---|
| AWS | ER383 |
| Specification | AWS A5.9/A5.9M / ASME SFA-5.9 |
| UNS | N08028 |
| Others | EN ISO 14343-A: W/G 27 31 4 Cu L; W.Nr. 1.4563 |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.025 |
| Cr | 26.5 – 28.5 |
| Ni | 30.0 – 33.0 |
| Mo | 3.2 – 4.2 |
| Cu | 0.70 – 1.5 |
| Mn | 1.0 – 2.5 |
| Si | ≤ 0.50 |
| P | ≤ 0.02 |
| S | ≤ 0.03 |
Properties of the deposited metal
| Property | Value |
|---|---|
| Tensile strength of deposited metal | ≥ 520 MPa (AWS A5.4 minimum for E383, reference) |
| Elongation | ≥ 30 % (AWS A5.4 minimum for E383, reference) |
Materials welded with ER383
Dissimilar joints: In very aggressive chloride media, alloy N08028 is also welded with ERNiCrMo-3.
Why the composition differs from the base metal
The chemistry is almost that of the base metal, but with tighter carbon, phosphorus and silicon. As the bead is fully austenitic, those limits reduce the risk of hot cracking, and Mo is kept at the top of the range to compensate for segregation.
Welding precautions
- No preheating; interpass up to 100 °C.
- Low heat input and narrow beads.
- Pure argon for shielding and purging; pickling after welding.
Frequently asked questions
What is ER383 used for?
Super-austenitic 27Cr-31Ni-3.5Mo-1Cu filler metal, with a composition close to alloy N08028, for phosphoric and sulfuric acid equipment and well tubing with H2S.
Why is the composition of ER383 different from the material it welds?
The chemistry is almost that of the base metal, but with tighter carbon, phosphorus and silicon. As the bead is fully austenitic, those limits reduce the risk of hot cracking, and Mo is kept at the top of the range to compensate for segregation.
Which covered electrode corresponds to ER383?
E383-16/-17 – AWS A5.4.
What precautions apply when welding with ER383?
No preheating; interpass up to 100 °C. Low heat input and narrow beads. Pure argon for shielding and purging; pickling after welding.
