Sep 11, 2026
What Is ER80S-B2 Welding Wire? AWS Classification, Applications and Selection
Learn what ER80S-B2 welding wire is, its AWS A5.28 classification, P11 applications, welding processes and key selection considerations.
Choosing the right welding wire for P11 and other Cr-Mo steels can be challenging. Many buyers compare ER80S-B2 with standard carbon steel wires such as ER70S-6, but the two are designed for different material systems.
So, what is ER80S-B2 welding wire, and when should you use it?
What Is ER80S-B2 Welding Wire?
ER80S-B2 is a low-alloy solid welding wire classified under AWS A5.28. It is designed for welding 1.25Cr-0.5Mo chromium-molybdenum steels.
The addition of chromium and molybdenum helps provide suitable weld-metal properties for high-temperature and pressure-service applications.
ER80S-B2 is commonly used for:
- P11 / P12 Cr-Mo steel
- T11 / T12 boiler tubes
- A387 Grade 11 / 12 steel
- High-temperature piping
- Boilers and heat exchangers
- Power plant equipment
- Petrochemical equipment
What Does ER80S-B2 Mean?
The AWS classification provides useful information about the welding wire:
Classification | Meaning |
ER | Electrode or Rod |
80 | Minimum tensile strength level of 80 ksi |
S | Solid wire |
B2 | 1.25Cr-0.5Mo alloy system |
The B2 designation is important because it identifies the Cr-Mo alloy system of the filler metal.
Why Is ER80S-B2 Used for P11 Steel?
One of the most common applications for ER80S-B2 is P11 steel welding.
P11 is a 1.25Cr-0.5Mo alloy steel designed for elevated-temperature service. Using a compatible Cr-Mo filler metal helps maintain appropriate weld-metal chemistry and performance.
This is why ER80S-B2 is commonly selected for P11/P12-type materials, subject to the applicable code and qualified WPS/PQR.
A common procurement mistake is choosing a welding wire based only on price or tensile strength.
For critical Cr-Mo applications, chemical compatibility matters as much as mechanical strength.
Where Is ER80S-B2 Welding Wire Used?
ER80S-B2 is widely associated with industrial applications where heat and pressure are important.
Typical applications include:
Power Generation
Boiler tubes, steam piping and high-temperature components.
Petrochemical Industry
Process piping, pressure equipment and refinery systems.
Pressure Equipment
Heat exchangers, boilers and other Cr-Mo steel components.
Maintenance & Repair
Repair welding of compatible P11/P12 and related Cr-Mo materials.
ER80S-B2 vs ER70S-6: Can They Be Substituted?
This is a common question from welding consumable buyers.
ER70S-6 is a carbon-steel solid wire, while ER80S-B2 is a Cr-Mo low-alloy welding wire.
Therefore, ER70S-6 should not automatically be used as a replacement for ER80S-B2 when welding P11 or other Cr-Mo steels.
The correct filler metal should be selected according to:
- Base-metal grade
- Chemical composition
- Welding process
- Service temperature
- Applicable code
- Qualified WPS/PQR
For industrial projects, using the correct AWS classification is generally more important than simply finding the lowest-cost wire.
What Welding Processes Use ER80S-B2?
ER80S-B2 is commonly used with:
- GTAW / TIG
- GMAW / MIG
The wire is available in different diameters depending on the welding process, joint design and project requirements.
For SMAW applications, a compatible Cr-Mo coated electrode such as E8018-B2 may be specified instead.
What Should Buyers Check Before Purchasing ER80S-B2?
If you are sourcing ER80S-B2 welding wire, don't check the classification alone.
Ask the supplier for:
- AWS classification
- Chemical composition
- Mechanical properties
- TDS
- MTC / CoA
- Batch traceability
- Wire diameter
- Spool and packaging information
- OEM options
- Sample availability
For Cr-Mo welding, consistent chemistry and reliable documentation are particularly important for industrial projects.
Why Choose GD WELD ER80S-B2 Welding Wire?
GD WELD specializes in special AWS-standard welding consumables for industrial applications.
Our ER80S-B2 welding wire is designed for applications involving P11/P12 and compatible 1.25Cr-0.5Mo steels.
GD WELD supports international buyers with:
- Stable product quality
- Technical documentation
- Batch traceability
- Export packaging
- OEM supply
- Sample support
For distributors, importers and industrial project buyers, the goal is simple: the right welding consumable for the right material and application.
Frequently Asked Questions
What is ER80S-B2 welding wire?
ER80S-B2 is an AWS A5.28 low-alloy solid welding wire for 1.25Cr-0.5Mo Cr-Mo steels and related applications.
What steel is ER80S-B2 used for?
It is commonly used for P11, P12, T11, T12 and A387 Grade 11/12 materials, subject to the qualified welding procedure.
Is ER80S-B2 suitable for P11 steel?
Yes. ER80S-B2 is a commonly selected filler metal for P11 steel welding because both belong to the 1.25Cr-0.5Mo material system.
What is the difference between ER80S-B2 and ER80S-B6?
ER80S-B2 is associated with 1.25Cr-0.5Mo, while ER80S-B6 is associated with 5Cr-0.5Mo. They are designed for different Cr-Mo steel systems and should not be treated as interchangeable.
Conclusion
ER80S-B2 is an AWS A5.28 low-alloy solid welding wire for 1.25Cr-0.5Mo Cr-Mo steels.
Its main applications include P11/P12 steel, boiler tubes, high-temperature piping, pressure equipment, power plants and petrochemical systems.
When selecting ER80S-B2, focus on base-metal compatibility, AWS classification, welding process, documentation and the qualified WPS/PQR rather than price alone.
If you are looking for a reliable ER80S-B2 welding wire supplier, GD WELD can provide product specifications, technical documents, OEM supply and samples.
