Kobatek 350
gENERAL DESCRIPTION
Kobatek 350 is a basic coated electrode used for welding martensitic and martensitic-ferritic type steels.
It exhibits high corrosion resistance to water, vapor and salt water. A preheating of 100-200°C should be applied for thick sectioned parts. Interpass temperature should be constant.
Weld beads are smooth and the slag is easy to remove.
Mechanical Properties, Typical, All Weld Metal
| Yield Strength | : | 70 – 80 | (kg/mm²) | ||
|---|---|---|---|---|---|
| Tensile Strength | : | 90 – 110 | (kg/mm²) | ||
| Elongation (L=5d) | : | 10 -15 | (%) | ||
| Hardness | : | 38 – 40 | (HRC) | ||
| Impact Value (ISO-V) |
: | 24 | (Joule) | (+20°C) |
Annealing temperature for stress relief is 550-600°C
Approvals and Certificates
Certificates
|
GOST |
Application Areas
It is particulary used for the protection of 12-15% Cr and 4% Ni containing steels against corrosion.
- Water turbines and compressors
- Pelton, Francis turbine rotors
- Kaplan turbine blades
- Valves used in gas, vapor and water pipelines operating under service temperatures up to 450°C
- Erosive and corrosive attacks caused by sea water
- Welding of X4 CrNi 13 4 and G-X5 CrNi 13 4 (1.4343) steels.
Welding Parameters / Packing and Diameter Informations
Current Type and Polarity : DC (+)
| Diameter x Length (mm) |
Current (Amper) |
Weight (kg/box) |
|---|---|---|
| 3.25 x 350 |
90 – 120 | 5 |
| 4.00 x 350 |
120 – 170 | 5 |
