Features
Suitable for all position welding, soft and stable arc, less splash,
Beautiful forming, good slag removal, less smoke, with excellent welding process performance
Low temperature impact performance
Chemical Composition
| Chemical components of deposited metal (%) (shielding gas: CO2) |
| Item | C | Mn | Si | S | P | Cr | Mo |
| Example value | 0.055 | 0.8 | 0.22 | 0.005 | 0.012 | 1.13 | 0.51 |
| Mechanical properties of deposited metal (shielding gas: CO2) |
| Item | Rm
(MPa) | ReL/Rp0.2
(MPa) | A
(%) | KV2 (J) | Heat treatment |
| 20℃ |
| Example value | 644 | 556 | 22.5 | 70 | 690×1h |
| Diameter of welding wire (mm) | φ1.2 |
| Current range | Flat welding | 120-300 |
| (A) | Upward vertical welding, overhead position welding | 120-260 |
| Vertical down welding | 200-300 |
| Horizontal position welding | 120-280 |
Application Scenarios: Meeting Critical Standards in Petrochemical and Power Plants
The metallurgical blueprint of the e81t1 b2c wire makes it a trusted asset for critical energy infrastructure. It is designed to meet strict structural compliance for industries operating under severe creep conditions:
Petrochemical Cracking Units: Perfect for welding ASTM A335 Grade P11/P12 pipes and A387 Grade 11 plates used in refinery hydrocrackers. The 1.13% Cr - 0.51% Mo alloy composition guards against high-temperature hydrogen attack (HTHA).
Power Plant Boiler Pipelines: Ideal for high-pressure steam pipelines, superheater tubes, and boiler headers operating continuously below 520℃, where maintaining long-term creep rupture strength is non-negotiable.
Chemical Machinery Fabrication: Delivers robust structural integrity for pressure vessels and heat exchangers, outperforming standard carbon steel alternatives or basic mma welding machine applications that cannot withstand elevated temperature fatigue.
Preventing Temper Embrittlement and Weld Defects in Cr-Mo Fabrication
| Potential Weld Defect | Underlying Root Cause | Industrial Engineering Solution |
| Hydrogen-Induced Cold Cracking | High hydrogen levels in the arc puddle, or insufficient preheating. | Maintain strict preheat temperatures (150℃-250℃). Keep flux-cored wires stored in a dry environment to prevent moisture absorption. |
| Temper Embrittlement | Prolonged exposure to temperatures in the 375℃ - 575 ℃ range, leading to trace element segregation. | Control the trace impurities (X-factor ≤ 15 ppm) during steel production. Follow correct PWHT (690℃ × 1h) guidelines to restore lattice ductility. |
| Slag Inclusion in Multi-Pass Runs | Improper torch travel angle or incomplete slag chipping between weld layers. | Clean each bead thoroughly using a wire wheel before the next pass. Utilize proper continuous positioning, similar to setups optimized for an automated seam welding machine. |
| Weld Porosity | Low CO_2 gas purity, erratic gas flow shielding, or drafty workshop environments. | Ensure CO_2 gas purity is ≥ 99.8%. Maintain a stable gas flow rate of 20–25 L/min and use wind screens for outdoor site welding. |
Technical FAQ Regarding AWS E81T1-B2C Gas Shielded Wire
What makes the E81T1-B2C flux-cored wire suitable for petroleum cracking equipment?
Our e81t1 b2c wire is specifically alloyed with 1.13% Cr and 0.51% Mo. This precise chemical metallurgy gives the deposited metal exceptional creep resistance and hydrogen attack resistance at high temperatures. It prevents thermal degradation and structural cracking, making it the safety standard for petroleum cracking plants and high-pressure chemical machinery operating under 520℃.
Why is Post-Weld Heat Treatment (PWHT) required for E81T1-B2C welds?
For heat-resistant alloy steels, a PWHT (typically 690℃ × 1 hour) is crucial. This heat treatment relieves the residual welding stresses locked inside the joint, tempers the heat-affected zone (HAZ), and optimizes the balance between tensile strength (644 MPa) and impact toughness (70 J), ensuring long-term structural reliability.
Can this wire be used with mixed shielding gases instead of pure CO2?
The e81t1 b2c series is primarily formulated and optimized for 100% CO_2 shielding gas to deliver deep penetration and clean slag properties. If you require specialized weather-resistant processing or mixed-gas formulations (Ar+CO_2), you may also review our top-performing resistance steel fluxed cored wire catalog.
How does this wire perform in heavy-duty automated pipeline fabrication?
Thanks to its fast-freezing slag formulation, this wire supports high-current all-position deposition. It can be easily integrated into manual torches or automated orbital welding tracks, working in perfect sync with specialized equipment like an automatic seam welding machine to accelerate thick-walled pipeline construction with zero defect rates.
