Metal & Flux Cored Wire
E91T1-B3 Flux Cored Welding Wire
E91T1-B3 is a Cr-Mo flux cored welding wire for 2.25Cr-1Mo heat-resistant steels used in high-temperature and pressure service. Classified under AWS A5.29 / ASME SFA-5.29, it is commonly used for P22 pipe, Grade 22 pressure-vessel steel, boiler piping and petrochemical equipment. E91T1-B3 is available as E91T1-B3C and E91T1-B3M for different shielding-gas requirements.
E91T1-B3 for P22 Welding
The main application of E91T1-B3 is welding 2.25% Cr-1% Mo steel, making it a suitable FCAW option for P22/T22 and related Cr-Mo materials.
Typical applications include:
- ASTM A335 P22 pipe
- ASTM A213 T22 tube
- ASTM A387 Grade 22 plate
- ASTM A182 F22 components
- Boiler and steam piping
- Pressure vessels
- Petrochemical and refinery equipment
- Heat exchangers
- High-temperature Cr-Mo steel fabrication and repair
The weld deposit is designed around the Cr-Mo chemistry used for elevated-temperature service.
E91T1-B3C or E91T1-B3M?
The C and M suffixes identify the shielding-gas option.
Classification | Shielding Gas |
|---|---|
E91T1-B3C | 100% COâ‚‚ |
E91T1-B3M | Ar/COâ‚‚ mixed gas |
Published products commonly specify 100% COâ‚‚ for B3C and Ar/COâ‚‚ mixtures for B3M. The exact gas ratio should follow the manufacturer's TDS and qualified WPS.
Welding Process & Classification
- AWS A5.29: E91T1-B3C / E91T1-B3M
- ASME SFA-5.29: E91T1-B3C / E91T1-B3M
- Process: FCAW-G
- Polarity: DC+
- Typical Diameters: 1.2, 1.4 and 1.6 mm
- Welding Position: All-position products are available
E91T1-B3 is a rutile flux cored wire designed for single- and multi-pass welding. Published product data highlights stable arc performance, low spatter and easy slag removal.
Weld Metal Chemistry
AWS classification reference limits:
Element | Reference (%) |
|---|---|
C | 0.05–0.12 |
Mn | ≤1.25 |
Si | ≤0.80 |
P | ≤0.030 |
S | ≤0.030 |
Cr | 2.00–2.50 |
Mo | 0.90–1.20 |
Typical deposited weld metal is close to 2.25% Cr and 1.0% Mo. Actual chemistry depends on the wire manufacturer, shielding gas and welding conditions.
Mechanical Properties
The AWS classification requires approximately:
Property | Requirement |
|---|---|
Yield Strength | ≥540 MPa |
Tensile Strength | 620–760 MPa |
Elongation | ≥17% |
Typical commercial results can exceed these minimum requirements. For example, published data for E91T1-B3 shows tensile strength around 705–726 MPa and elongation around 18–20% after stress relief/PWHT.
Welding Parameters
Typical current ranges for commercial E91T1-B3 wire are:
Wire Diameter | Current Range |
|---|---|
1.2 mm | 120–300 A |
1.4 mm | 200–350 A |
1.6 mm | 200–400 A |
These are reference ranges rather than universal settings. Actual current, voltage, wire feed speed and shielding-gas flow should follow the product TDS and qualified WPS.
P22 Preheat and PWHT
For P22 and other 2.25Cr-1Mo steels, welding procedure control is important for high-temperature and pressure applications.
Preheat, interpass temperature and PWHT should be established according to the base material, thickness, applicable construction code and qualified WPS.
Published E91T1-B3 product data commonly uses PWHT around 690°C, while preheat requirements vary by manufacturer and welding procedure.
Supply from GD WELD
GD WELD supplies E91T1-B3 flux cored welding wire for P22, 2.25Cr-1Mo steel, boiler, pressure vessel, petrochemical and high-temperature piping applications.
For quotation, specify:
- E91T1-B3C or E91T1-B3M
- Wire diameter
- Quantity
- Base material
- Shielding gas
- Applicable standard
- Certification and packaging requirements
Tags
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