ER80S-B8 – wire and rod for 9Cr-1Mo steel (F9)
9Cr-1Mo filler metal for ASTM A182 F9 forgings and tubes, used in refinery furnaces and high-temperature sulfur service.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ER80S-B8 |
| Solid MIG/MAG wire (GMAW) | ER80S-B8 |
| Covered electrode (SMAW) | E8015-B8 / E8016-B8 / E8018-B8 – AWS A5.5 |
| Submerged arc wire (SAW) | EB8 + flux – AWS A5.23 |
| Designation | Value |
|---|---|
| AWS | ER80S-B8 |
| Specification | AWS A5.28/A5.28M / ASME SFA-5.28 |
| UNS | S50480 |
| Others | EN ISO 21952-A: W/G CrMo9Si*; AWS A5.28M: ER55S-B8 |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | ≤ 0.10 |
| Mn | 0.40 – 0.70 |
| Si | ≤ 0.50 |
| Cr | 8.00 – 10.50 |
| Mo | 0.80 – 1.20 |
| Ni | ≤ 0.50 |
| P | ≤ 0.025 |
| S | ≤ 0.025 |
| Cu | ≤ 0.35 |
Properties of the deposited metal
| Property | Value |
|---|---|
| Tensile strength of deposited metal | ≥ 550 MPa (AWS minimum, after PWHT) |
| Yield strength | ≥ 470 MPa (AWS minimum, after PWHT)* |
| Elongation | ≥ 17 % (AWS minimum, after PWHT)* |
Materials welded with ER80S-B8
Why the composition differs from the base metal
As with F5, the wire limits carbon to 0.10 % so that the bead, which hardens in air, does not become excessively hard. Unlike F91, there is no addition of V, Nb and N; that is why it must not be used on F91.
Welding precautions
- Preheat and interpass of about 200 to 300 °C.
- PWHT typically between 705 and 760 °C.
- Do not confuse with ER90S-B9, which is meant for F91.
- TIG with pure argon; MIG/MAG with argon and 2–5 % O2 or up to 20 % CO2*. Clean, dry wire and bevel to limit hydrogen.
Frequently asked questions
What is ER80S-B8 used for?
9Cr-1Mo filler metal for ASTM A182 F9 forgings and tubes, used in refinery furnaces and high-temperature sulfur service.
Why is the composition of ER80S-B8 different from the material it welds?
As with F5, the wire limits carbon to 0.10 % so that the bead, which hardens in air, does not become excessively hard. Unlike F91, there is no addition of V, Nb and N; that is why it must not be used on F91.
Which covered electrode corresponds to ER80S-B8?
E8015-B8 / E8016-B8 / E8018-B8 – AWS A5.5.
What precautions apply when welding with ER80S-B8?
Preheat and interpass of about 200 to 300 °C. PWHT typically between 705 and 760 °C. Do not confuse with ER90S-B9, which is meant for F91. TIG with pure argon; MIG/MAG with argon and 2–5 % O2 or up to 20 % CO2*. Clean, dry wire and bevel to limit hydrogen.
