J427HIC
J427HIC is a hydrogen-resistant steel welding electrode with low-hydrogen sodium coating, which adopts DCEP method. It is permitted for all positions welding. The product presents excellent welding performance with soft arc, low spatter level and optimal bead appearance. The deposited metal has excellent plasticity, low temperature impact toughness and HIC and SSC resistance.
The product is applicable for the welding of Q235R(HIC) and 20#(HIC) hydrogen-resistant steel plates, such as crude oil distillation, coking and cracking units such as primary distillation tower, flash tower, atmospheric tower, vacuum tower, splitter tower, stabilizer tower and stripping tower.
Chemical components of deposited metal (%)
Test item |
C |
Mn |
Si |
S |
P |
Ni |
Cr |
Mo |
V |
| Example value | 0.085 | 0.83 | 0.39 | 0.004 | 0.007 | 0.020 | 0.010 | 0.010 | 0.002 |
Mechanical properties of deposited metal (620℃×1h heat treatment)
Test item |
Rm(MPa) |
ReL/Rp0.2(MPa) |
A(%) |
KV2(J) |
-30℃ | ||||
| Example value | 490 | 380 | 30 | 185 |
X-ray flaw detection requirements: Level I
Reference current (DC )
Welding electrode diameter (mm) |
Φ2.5 |
Φ3.2 |
Φ4.0 |
Φ5.0 |
| Welding current (A) | 60-100 | 80-130 | 140-180 | 170-210 |
1. Before welding, the welding electrode should be baked at 350℃ for 1 hour for ready use.
2. Impurities such as rust, oil stain and moisture must be cleared off of the work piece before welding.
3. Operating with short arc and narrow gap when welding.
2. Impurities such as rust, oil stain and moisture must be cleared off of the work piece before welding.
3. Operating with short arc and narrow gap when welding.
