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