D256
Description:
D256 is low hydrogen potassium type coating of high manganese steel surfacing electrode, AC and DC can be used (AC welding, no-load voltage not less than 70V), surfacing should adopt a small current, narrow welding, while red hot Immediately hammer or water quench to reduce the tendency of cracks. Surfacing metal austenitic high manganese steel, with work hardening, tough and wear-resistant characteristics.
use:
Applicable to all kinds of crusher, high manganese rail, bucket, bulldozers and other parts subject to impact and easy surfacing.
Deposited metal chemical composition (%)
| C | Mn | Si | Other elements of the total |
guarantee value | ≤1.10 | 11.00 ~ 16.00 | ≤1.30 | ≤5.00 |
Example value | 0.54 | 14.00 | 0.32 | - |
Surfacing layer hardness:
HB ≧ 170
Reference current (AC, DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 70 ~ 90 | 100 ~ 140 | 150 ~ 180 |
Precautions:
1. Before welding electrodes to be 300 ~ 350 ℃ baking 1h.
2. Surfacing has worn high manganese steel parts, prior to the fatigue layer should be eradicated or tough water treatment or chromium-manganese steel electrode (such as D277) primer.
3. When surfacing a lot of yellow smoke, should pay attention to strengthening ventilation and stand in the upper position for operation.
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