ER80S-B2 – wire and rod for 1¼Cr-½Mo steel (F11)
1¼Cr-½Mo filler metal for ASTM A182 F11 and equivalent pipes, forgings and flanges, in boilers, steam lines and refineries.
Product forms and equivalents
| Process | Classification |
|---|---|
| TIG rod (GTAW) | ER80S-B2 |
| Solid MIG/MAG wire (GMAW) | ER80S-B2 |
| Covered electrode (SMAW) | E8018-B2 – AWS A5.5 |
| Flux-cored wire (FCAW) | E81T1-B2 – AWS A5.29 |
| Submerged arc wire (SAW) | EB2 + flux – AWS A5.23 |
| Designation | Value |
|---|---|
| AWS | ER80S-B2 |
| Specification | AWS A5.28/A5.28M / ASME SFA-5.28 |
| UNS | K20900 |
| Others | EN ISO 21952-A: W/G CrMo1Si*; AWS A5.28M: ER55S-B2 |
Chemical composition (%)
| Element | wt. % |
|---|---|
| C | 0.07 – 0.12 |
| Mn | 0.40 – 0.70 |
| Si | 0.40 – 0.70 |
| Cr | 1.20 – 1.50 |
| Mo | 0.40 – 0.65 |
| Ni | ≤ 0.20 |
| 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 | ≥ 19 % (AWS minimum, after PWHT)* |
Materials welded with ER80S-B2
Dissimilar joints: Also used to join F11 to carbon steel or C-½Mo (F1), adopting the preheat of the more highly alloyed material.
Why the composition differs from the base metal
Chromium and molybdenum follow F11, but carbon is kept low and silicon and manganese are dosed to deoxidize the pool. The result, after PWHT, is equivalent creep resistance with a lower risk of cold cracking.
Welding precautions
- Preheat and interpass of about 150 to 300 °C.
- PWHT typically between 650 and 730 °C, according to the design code.
- 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-B2 used for?
1¼Cr-½Mo filler metal for ASTM A182 F11 and equivalent pipes, forgings and flanges, in boilers, steam lines and refineries.
Why is the composition of ER80S-B2 different from the material it welds?
Chromium and molybdenum follow F11, but carbon is kept low and silicon and manganese are dosed to deoxidize the pool. The result, after PWHT, is equivalent creep resistance with a lower risk of cold cracking.
Which covered electrode corresponds to ER80S-B2?
E8018-B2 – AWS A5.5.
What precautions apply when welding with ER80S-B2?
Preheat and interpass of about 150 to 300 °C. PWHT typically between 650 and 730 °C, according to the design code. 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.
