Instruction and Application: Low alloy high strength steel with low hydrogen type electrode. DC reverse polarity, good all position welding process, welding good mechanical properties, good crack resistance. For welding the appropriate intensity level of pressure vessels, pressure pipelines, bridges, offshore structures, and so on.
Typical Chemical Composition of the all-welded metal(％)
|
C |
Si |
Mn |
S |
P |
Ni |
Mo |
|
0.055 |
0.28 |
1.22 |
0.008 |
0.010 |
3.55 |
0.60 |
Mechanical properties of all-weld metal
|
Temperature |
Tensile strength Rm(MPa) |
Yield strength Rp(MPa) |
Elongation A(%) |
Impact Strength KV2(J,-40℃) |
|
Room temperature |
815 |
765 |
18 |
95,110,105 |
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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