Instruction and Application: Low-sodium type coating of high strength low alloy steel electrodes. DC reverse polarity, all-position welding can be carried out. With good ductility and toughness of deposited metal. For welded pressure vessels, bridges. Hydropower station drop tube and marine engineering, and other important structures.
Typical Chemical Composition of the all-welded metal(％)
|
C |
Si |
Mn |
S |
P |
Ni |
Mo |
Cr |
|
0.07 |
0.25 |
1.58 |
0.007 |
0.010 |
0.82 |
0.34 |
0.22 |
Mechanical properties of all-weld metal
|
Temperature |
Tensile strength Rm(MPa) |
Yield strength Rp(MPa) |
Elongation A(%) |
Impact Strength KV2(J,-30℃) |
Heat treatment |
|
Room temperature |
670 |
600 |
22 |
102,110,105 |
620℃×8h |
HD (Mercury method): ≤5.0ml/100g
Deposited metal radio-graphic testing:
According to NB / T 47013.2, the radio-graphic detecting technique should not be less than class AB and the quality grade of deposited metal should not be less than Class I.
Reference Current(DC+):
|
Sizeφ（mm) |
φ2.5 |
φ3.2 |
φ4.0 |
φ5.0 |
|
Amperage (A) |
70-100 |
90-130 |
130-180 |
180-220 |
Notice:
1.Redry the electrode at 400℃ for 1hours.
2.Multi-pass welding must clean the welding slag. Each layer is controlled below 250 ℃.
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