D517
Description:
D517 is a low hydrogen sodium type 2Cr13 valve welding electrodes, using DC reverse. Surfacing metal 2Cr13 martensitic high-chromium steel. Surfacing layer with air quenching characteristics, generally do not need heat treatment, hardness uniformity, annealing at 750 ~ 800 ℃ softening, when heated to 950 ~ 1000 ℃ air cooling or oil quenching can be re-hardened.
use:
For welding carbon steel or low alloy steel shaft, superheated steam valve, mixer paddle, screw conveyor blades and so on.
Deposited metal chemical composition (%)
| C | Cr | Other elements of the total |
guarantee value | ≤0.25 | 10.00 ~ 16.00 | ≤5.00 |
Example value | 0.20 | 13.40 | - |
Surfacing layer hardness:
(Air-cooled after welding) HRC ≥ 45 (softening to 500 ℃)
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 120 | 120 ~ 160 | 170 ~ 210 |
Precautions:
1. Before welding electrodes to be 300-350 ℃ baking 1h
2. Before welding the workpiece to be preheated to 300 ℃ above, such as welding after a different heat treatment can obtain the appropriate hardness.
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