Heat Resistant & Cr-Mo
ER80S-B6 for P5 & T5
ER80S-B6 welding wire is an AWS A5.28 low-alloy Cr-Mo solid welding wire for P5, T5 and other compatible 5Cr-0.5Mo steels used in high-temperature and corrosion-resistant applications. ER80S-B6 is a 5Cr-0.5Mo low-alloy welding wire designed for compatible P5 and T5 steels. It is commonly used for high-temperature piping, refinery equipment, pressure vessels, heat exchangers, petrochemical equipment and other demanding industrial applications.
ER80S-B6 Welding Wire
ER80S-B6 is an AWS A5.28 low-alloy solid welding wire for compatible 5Cr-0.5Mo steels such as P5 and T5.
It belongs to the 5Cr-0.5Mo Cr-Mo welding consumable family and is used where compatible weld-metal chemistry and elevated-temperature performance are required.
ER80S-B6 is particularly relevant to P5 welding wire, T5 welding wire, refinery piping, petrochemical equipment and other compatible Cr-Mo applications.
Depending on product form and qualified welding procedure, ER80S-B6 can be supplied for GMAW/MIG and GTAW/TIG applications.
ER80S-B6 at a Glance
Item | Details |
|---|---|
AWS Classification | ER80S-B6 |
Specification | AWS A5.28 / ASME SFA-5.28 |
Alloy System | 5Cr-0.5Mo |
Strength Class | ER80 |
Typical Base Materials | P5, T5 and compatible 5Cr-0.5Mo steels |
Welding Processes | GMAW/MIG, GTAW/TIG |
Typical Applications | Refinery, petrochemical, high-temperature piping and process equipment |
Product Form | Solid wire / TIG rod |
Documentation | TDS, MTC/CoA and project documentation as required |
5Cr-0.5Mo: The Material System Behind B6
The defining feature of ER80S-B6 is its 5Cr-0.5Mo weld-metal chemistry.
This places B6 between lower-chromium and higher-chromium Cr-Mo consumable systems commonly used for heat-resistant steels.
Typical associated materials include:
- ASTM A335 P5
- ASTM A213 T5
- ASTM A182 F5
- ASTM A387 Grade 5
- ASTM A234 WP5
- Other compatible 5Cr-0.5Mo steels
The correct filler metal should be selected according to the base material, qualified WPS/PQR and applicable construction code.
ER80S-B6 Chemical Composition
ER80S-B6 is based on a controlled 5Cr-0.5Mo alloy system.
Typical classification chemistry includes:
Element | Typical Classification Requirement, wt.% |
|---|---|
C | ≤0.10 |
Mn | 0.40–0.70 |
Si | ≤0.50 |
Cr | 4.50–6.00 |
Mo | 0.45–0.65 |
Ni | ≤0.60 |
Cu | ≤0.35 |
P | ≤0.020 |
S | ≤0.010 |
These values describe classification limits and should not be treated as the exact chemistry of every production batch.
For purchasing, verify actual chemistry against the supplied TDS and MTC/CoA.
Mechanical Properties
ER80S-B6 belongs to the ER80 strength classification.
For product qualification and purchasing, distinguish between:
AWS classification requirements
and
actual product test results.
Typical minimum strength levels associated with the classification include an ER80-class tensile strength of approximately 550 MPa / 80 ksi.
Actual yield strength, tensile strength, elongation and any impact-test results depend on the applicable testing condition, welding procedure and PWHT.
For a project-specific order, the current product TDS, MTC/CoA and qualified WPS/PQR should be used to verify the required mechanical properties.
P5 and T5: Where B6 Fits
ER80S-B6 is primarily associated with the 5Cr-0.5Mo material family.
P5 Welding Wire
P5 welding wire is one of the main purchasing applications for ER80S-B6.
P5 is a 5Cr-0.5Mo low-alloy steel used in elevated-temperature equipment such as:
- Refinery piping
- Process piping
- Heat exchangers
- Furnace components
- Pressure equipment
- High-temperature process systems
T5 Welding Wire
T5 welding wire is another important application.
T5 materials are encountered in heat-transfer and elevated-temperature equipment, including suitable:
- Boiler components
- Tubes
- Heat-transfer equipment
- Process systems
- Industrial thermal equipment
Final filler-metal selection should always follow the applicable material specification and qualified welding procedure.
Why Use ER80S-B6 for P5?
The key reason is material-system compatibility.
ER80S-B6 combines:
5Cr + 0.5Mo + ER80-class weld-metal strength
This makes it a relevant consumable for compatible P5/T5 Cr-Mo steels where controlled weld-metal chemistry is required.
The selection should not be based only on tensile strength or chromium content.
Consider:
Base Material + Weld-Metal Chemistry + Welding Procedure + PWHT + Service Conditions
This is particularly important when comparing B6 with B2, B3 or B8.
ER80S-B6 in Refinery and Process Equipment
B6 is strongly associated with applications where 5Cr-0.5Mo steels are used in elevated-temperature environments.
Typical application areas include:
Refinery
- Process piping
- High-temperature piping
- Furnace components
- Heat exchangers
- Pressure equipment
Petrochemical
- Process units
- High-temperature piping
- Heat-transfer equipment
- Pressure-containing components
Chemical and Industrial Processing
- Process piping
- High-temperature equipment
- Compatible Cr-Mo components
- Thermal-process equipment
Application suitability depends on the actual base material, service conditions and qualified welding procedure.
Welding Processes for ER80S-B6
GMAW / MIG
ER80S-B6 can be supplied as solid wire for GMAW/MIG applications.
The welding procedure may control:
- Wire diameter
- Shielding gas
- Current
- Voltage
- Wire-feed speed
- Travel speed
- Heat input
Actual parameters should be established by the qualified WPS.
GTAW / TIG
ER80S-B6 can also be supplied as TIG filler rod.
GTAW may be selected for applications requiring:
- Controlled root welding
- Precision deposition
- Pipe welding
- Critical joints
- Controlled heat input
Shielding gas and purge requirements should follow the qualified welding procedure.
P5 Welding Procedure and Thermal Control
For P5 and T5 Cr-Mo steels, welding procedure control is an important part of joint quality.
Depending on material thickness, joint design, welding process and applicable code, the WPS may establish requirements for:
Preheat → Interpass Temperature → Heat Input → Cooling → PWHT
There is no universal preheat or PWHT schedule that should be copied from a generic product page.
The applicable temperatures, holding times and cooling requirements should be taken from the approved WPS/PQR, material specification and construction code.
B6 in the Cr-Mo Consumable Selection Map
For customers choosing among common Cr-Mo welding wires, the base material provides a useful starting point:
Base Material | Commonly Associated Wire |
|---|---|
P11 / T11 | ER80S-B2 |
P22 / T22 | ER90S-B3 |
P5 / T5 | ER80S-B6 |
P9 / T9 | ER80S-B8 |
P91 / T91 | ER90S-B91 |
P92 / T92 | ER90S-B92 |
This is a material-selection guide, not a universal substitution rule. The qualified WPS/PQR and applicable code remain controlling.
ER80S-B6 vs ER80S-B2
Both are ER80-class Cr-Mo consumables, but they serve different alloy systems.
| ER80S-B6 | ER80S-B2 |
|---|---|---|
Alloy System | 5Cr-0.5Mo | 1.25Cr-0.5Mo |
Typical Steel | P5 / T5 | P11 / T11 |
Strength Class | ER80 | ER80 |
Chromium | ~5% | ~1.25% |
Molybdenum | ~0.5% | ~0.5% |
Typical Applications | Refinery / process equipment | Boiler / piping |
P5/T5 → B6
P11/T11 → B2
ER80S-B6 vs ER90S-B3
The major difference is the Cr-Mo material system.
| ER80S-B6 | ER90S-B3 |
|---|---|---|
Alloy System | 5Cr-0.5Mo | 2.25Cr-1Mo |
Typical Steel | P5 / T5 | P22 / T22 |
Strength Class | ER80 | ER90 |
Chromium | ~5% | ~2.25% |
Molybdenum | ~0.5% | ~1% |
Typical Applications | Refinery / process equipment | Boiler / refinery / power |
P5/T5 → B6
P22/T22 → B3
ER80S-B6 vs ER80S-B8
B6 and B8 are both ER80-class Cr-Mo wires, but their chromium and molybdenum systems are different.
| ER80S-B6 | ER80S-B8 |
|---|---|---|
Alloy System | 5Cr-0.5Mo | 9Cr-1Mo |
Typical Steel | P5 / T5 | P9 / T9 |
Strength Class | ER80 | ER80 |
Chromium | ~5% | ~9% |
Molybdenum | ~0.5% | ~1% |
Typical Role | 5Cr-0.5Mo applications | 9Cr-1Mo applications |
P5/T5 → B6
P9/T9 → B8
ER80S-B6 vs ER90S-B91
These two classifications belong to substantially different material systems.
| ER80S-B6 | ER90S-B91 |
|---|---|---|
Typical Steel | P5 / T5 | P91 / T91 |
Alloy System | 5Cr-0.5Mo | Modified 9Cr-1Mo-V-Nb |
Strength Class | ER80 | ER90 |
Typical Service | High-temperature | High-temperature / creep-resistant |
Typical Applications | Refinery / process equipment | Grade 91 power-generation applications |
P5/T5 ≠ P91/T91
Do not select B6 for a P91 application simply because both are used at elevated temperature.
ER80S-B6 vs ER90S-B92
| ER80S-B6 | ER90S-B92 |
|---|---|---|
Typical Steel | P5 / T5 | P92 / T92 |
Alloy System | 5Cr-0.5Mo | Modified 9Cr-W-Mo-V-Nb |
Strength Class | ER80 | ER90 |
Typical Service | High-temperature | High-temperature / creep-resistant |
Typical Role | 5Cr-0.5Mo applications | Grade 92 applications |
P5/T5 → B6
P92/T92 → B92
What About ER90S-B9 and B91?
B6 should not be grouped with Grade 91 consumables simply because both may be used in high-temperature service.
For Grade 91 materials such as P91/T91, the relevant consumable system is based on the modified 9Cr alloy family.
P5/T5 → ER80S-B6
P91/T91 → Grade 91 consumable system
For older specifications referring to ER90S-B9, verify the required designation against the current project specification and applicable AWS classification.
Diameter and Product Forms
ER80S-B6 can be supplied in different diameters and forms according to welding process and customer requirements.
Possible formats include:
- GMAW/MIG spools
- GTAW/TIG rods
- Different wire diameters
- Standard industrial packaging
- Customized packaging where available
For quotation, provide:
Diameter + Welding Process + Product Form + Packaging + Quantity
Available sizes and packaging should be confirmed against the current supply program.
Technical Documentation
For industrial ER80S-B6 projects, buyers may require:
TDS · MTC/CoA · Chemical Composition · Mechanical Properties · Impact Data Where Applicable · Certificate of Conformity · Packaging Information
For refinery, petrochemical, pressure-equipment and high-temperature projects, confirm certification requirements before ordering.
ER80S-B6 Selection Checklist
Before ordering, confirm:
Base Material
P5, T5, F5 or another compatible 5Cr-0.5Mo grade?
Classification
Does the WPS specify ER80S-B6?
Welding Process
GMAW/MIG or GTAW/TIG?
Diameter
What wire or rod diameter is required?
Service Conditions
What temperature, pressure and operating environment apply?
PWHT
What post-weld heat-treatment requirements apply?
Mechanical Requirements
Are tensile, impact or hardness requirements specified?
Documentation
Is MTC/CoA or project-specific certification required?
Packaging
Spool, TIG rod or another product format?
Frequently Asked Questions
What is ER80S-B6 welding wire?
ER80S-B6 is an AWS A5.28 low-alloy Cr-Mo welding wire associated with the 5Cr-0.5Mo material system.
What is ER80S-B6 used for?
It is commonly associated with P5/T5 welding applications in refinery, petrochemical, process piping, heat exchangers, pressure equipment and other elevated-temperature systems.
Is ER80S-B6 suitable for P5 steel?
ER80S-B6 is associated with compatible P5 applications. Final selection should follow the qualified WPS/PQR and applicable code.
Is ER80S-B6 suitable for T5 steel?
Yes, it is associated with compatible T5 applications, subject to the applicable welding procedure and project requirements.
What is the difference between ER80S-B6 and ER80S-B2?
B6 is associated with 5Cr-0.5Mo / P5-T5, while B2 is associated with 1.25Cr-0.5Mo / P11-T11.
What is the difference between ER80S-B6 and ER90S-B3?
B6 is associated with 5Cr-0.5Mo / P5-T5, while B3 is associated with 2.25Cr-1Mo / P22-T22.
What is the difference between ER80S-B6 and ER80S-B8?
B6 is associated with 5Cr-0.5Mo / P5-T5, while B8 is associated with 9Cr-1Mo / P9-T9.
Can ER80S-B6 be used for P22?
Do not assume substitution. P22 requires the appropriate 2.25Cr-1Mo consumable system and qualified welding procedure.
Can ER80S-B6 be used for P91?
Do not assume substitution. P91 requires the appropriate Grade 91 consumable system and qualified welding procedure.
Does ER80S-B6 require PWHT?
PWHT requirements depend on the base material, thickness, welding procedure and applicable code. Follow the approved WPS/PQR.
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