Metal & Flux Cored Wire
E81T1-B2 Flux Cored Welding Wire
E81T1-B2 is a low-alloy Cr-Mo flux cored welding wire for all-position FCAW of 1.25Cr-0.5Mo steels. Under AWS A5.29, it is commonly classified as E81T1-B2C or E81T1-B2M, depending on the shielding gas. It is designed for P11/P12 welding, Cr-Mo pipe fabrication, boilers, pressure vessels and petrochemical equipment requiring controlled welding and PWHT.
E81T1-B2 Cr-Mo Flux Cored Welding Wire
E81T1-B2 is a gas-shielded FCAW wire for welding 1.25Cr-0.5Mo low-alloy steel. It is commonly selected as a P11 Cr-Mo welding wire for pipe, pressure equipment and high-temperature service.
The continuous-wire process provides higher productivity than manual stick welding while maintaining a Cr-Mo weld-metal chemistry suitable for qualified industrial welding procedures.
E81T1-B2C vs E81T1-B2M
Both classifications belong to the E81T1-B2 family. The main difference is the shielding gas:
Classification | Shielding Gas |
|---|---|
E81T1-B2C | 100% CO₂ |
E81T1-B2M | Ar/CO₂ mixed gas |
The exact shielding-gas composition and welding parameters should follow the manufacturer's technical data and qualified WPS.
Base Materials & Applications
E81T1-B2 is commonly used for:
- ASTM A335 P11/P12 pipe
- ASTM A387 Grade 11 Cr-Mo steel
- ASTM A213 T11/T12 tubing
- 1.25Cr-0.5Mo steel components
- Cr-Mo process piping
- Boiler and steam piping
- Pressure vessels
- Heat exchangers
- Power-generation equipment
- Petrochemical and oil & gas equipment
For P11 steel welding, preheat, interpass temperature and PWHT should be established according to the applicable code and qualified welding procedure.
International Classification
- AWS A5.29: E81T1-B2C / E81T1-B2M
- ASME SFA-5.29: E81T1-B2C / E81T1-B2M
- Process: FCAW-G
- Polarity: DC+
Typical Weld Metal Chemical Composition
The following values represent AWS classification/reference limits rather than a guaranteed GD WELD product analysis.
Element | AWS Reference (%) |
|---|---|
C | 0.05–0.12 |
Mn | ≤1.25 |
Si | ≤0.80 |
P | ≤0.030 |
S | ≤0.030 |
Cr | 1.00–1.50 |
Mo | 0.40–0.65 |
Actual weld-metal chemistry can vary according to shielding gas, manufacturer, welding procedure and production batch.
Mechanical Properties After PWHT
AWS Classification Requirements
Property | Requirement |
|---|---|
Yield Strength | ≥470 MPa |
Tensile Strength | 550–690 MPa |
Elongation | ≥19% |
Commercial products may show higher typical values depending on shielding gas and PWHT condition. Actual mechanical properties should be confirmed by the manufacturer's test certificate.
Typical FCAW Welding Parameters
Welding parameters vary with wire diameter, shielding gas, welding position and manufacturer.
For 1.2 mm wire, a typical commercial range with Ar/CO₂ shielding gas is approximately:
- Current: 160–260 A
- Voltage: 24–30 V
- Polarity: DC+
- Shielding Gas: Ar/CO₂ mixed gas
With 100% CO₂, voltage and other parameters may require adjustment according to the manufacturer's datasheet.
Supply from GD WELD
GD WELD supplies E81T1-B2 flux cored welding wire for P11/P12 Cr-Mo piping, pressure equipment, power generation and petrochemical applications.
For quotation, specify:
- E81T1-B2C or E81T1-B2M
- Wire diameter
- Shielding gas
- Quantity
- Base material
- Applicable standard or project specification
Tags
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