D557
Description:
D557 is a low hydrogen sodium type CrNiSi valve welding electrodes, surfacing metal relying on a large number of silicon to strengthen the austenite + ferrite organization, with the aging time, the hardness and scratch resistance further The improvement of surfacing metal has good corrosion resistance, oxidation resistance and corrosion resistance, the use of DC reverse.
use:
For working temperature below 600 ℃ high pressure valve sealing surface surfacing.
Deposited metal chemical composition (%)
| C | Mn | Si | Cr | Ni | S | P |
guarantee value | ≤0.20 | 2.00 ~ 3.00 | 5.00 ~ 7.00 | 18.00 ~ 20.00 | 7.00 ~ 10.00 | ≤0.030 | ≤0.040 |
Surfacing layer hardness:
HRC ≥37
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 120 | 120 ~ 160 | 160 ~ 200 |
Precautions:
1. The electrode before welding shall be baked at 300-350 ℃ for 1h
. 2. Due to the high hardness of the deposited metal, the preheating temperature is 300-450 ℃, surfacing when possible to use short arc, small current.
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