D547
Description:
D547 is a low hydrogen sodium type coating, alloy steel core CrNiSi-type valve surfacing electrode, the use of DC reverse. Surfacing metal relies on silicon for strengthening, to obtain a certain ferrite austenite, so that it has good resistance to scratches, corrosion, oxidation and other properties.
use:
For the welding of work below 570 ℃ high pressure boiler plant valve sealing surface and other sealing parts.
Deposited metal chemical composition (%)
| C | Mn | Si | Cr | Ni | S | P |
guarantee value | ≤0.18 | 0.60 ~ 2.00 | 4.80 ~ 6.40 | 15.00 ~ 18.00 | 7.00 ~ 9.00 | ≤0.030 | ≤0.040 |
Example value | 0.070 | 1.60 | 5.40 | 17.00 | 8.50 | 0.004 | 0.022 |
Surfacing layer hardness:
HB 270 ~ 320
Reference current (DC + )
Electrode diameter (mm) | φ3.2 | φ4.0 | φ5.0 |
Welding current (A) | 80 ~ 120 | 120 ~ 160 | 160 ~ 200 |
Precautions:
1. Before welding electrodes to be 300 ~ 350 ℃ baking 1h.
2 surfacing General steel, small pieces of blank, without preheating, surfacing large parts or other steel can be preheated temperature, surfacing layer 3 to 4 is appropriate (hardness, chemical composition and stability).
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