Instruction and Application: Low - hydrogen sodium - type drug - coated low-temperature steel electrode.- 75 ℃ with good impact toughness.DC reverse, all-position welding.Used for welding - 75 ℃ low temperature steel structure, such as ASME SA 203 Gr. B (09 MnNiDR), etc.
Typical Chemical Composition of the all-weld metal(％)
|
C |
Si |
Mn |
S |
P |
Ni |
|
0.04 |
0.18 |
0.50 |
0.004 |
0.010 |
2.54 |
Mechanical properties of all-weld metal
|
Temperature |
Tensile strength Rm(MPa) |
Yield strength Rp(MPa) |
Elongation A(%) |
Impact Strength KV2(J,-75℃) |
Heat treatment |
|
Room temperature |
540 |
440 |
25 |
152,165,170 |
590℃×5h |
*In practice, the heat treatment system shall be formulated separately by the supply and demand parties or by the conditions of the working conditions (such as the thickness of the specimen).
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+):
|
Electrodes size（mm) |
φ2.5 |
φ3.2 |
φ4.0 |
φ5.0 |
|
Welding current(A) |
70~100 |
90~130 |
130~180 |
180~220 |
Notice：
1. Redry the electrode at 380 ℃ for 1hours.
2. Interpass temperature should be controlled to below200°C.
3. Operate with short arc and narrow bead welding method.
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