D277
Description:
D277 is a low-hydrogen type coating of high chromium manganese steel corrosion resistant surfacing electrode, D277 DC reverse. Weld metal can work harden, full of toughness, cavitation erosion, and has good crack resistance.
use:
Suitable for surfacing welding turbine damage by cavitation of parts, such as water turbine blades leaves, but also for high wear resistance and toughness of high manganese steel surfacing, such as railway turnouts, screw conveyor, bulldozers Blade, grab, broken blade and so on.
Deposited metal chemical composition (%)
| C | Mn | Si | Cr | Ni | Mo | Other elements of the total |
guarantee value | ≤0.80 | 11.00 ~ 18.00 | ≤1.30 | 13.00 ~ 17.00 | ≤2.00 | ≤2.00 | ≤4.00 |
Example value | 0.38 | 12.65 | 0.45 | 14.20 | 0.050 | 0.065 | - |
Surfacing layer hardness:
HB ≧ 210
Reference current (AC, DC + )
Electrode diameter (mm) | φ2.5 | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 60 ~ 80 | 90 ~ 130 | 130 ~ 170 | 170 ~ 220 |
Precautions:
1. Before surfacing, the electrode must be baked at 300 ~ 350 ℃ for 1h.
2. When surfacing a lot of yellow smoke, should pay attention to strengthening the ventilation and stand in the upper position for operation.
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