ARK 390 arc spray coating is iron-based with a high-boron structure. It also has high bond strength plus high hardness and wear resistance because its hard phase is formed from FeB.

Main features

  • High chromium content
  • High temperature oxidation resistant
  • Good erosion wear resistance
  • Good thermal shock resistance
  • The oxide content in the coating is low

Typical applications

  • Boiler tubes for pulverized coal-fired boilers and waste incinerators against high temperature oxidation, hot corrosion and erosion wear
  • Steel converter, hoods and flue ducts.

Chemical composition of deposited metal (%)


Mechanical properties

Bond Strength (MPa)
Acc. to ASTM C633-01
Micro-hardness (HV 0.1, kg/mm²)
50–52 (Low carbon steel substrate)560–730

Coating properties

Density (g/cm³)% Prosity% Deposition efficiency

Recommended spraying parameters

Diameter: in (mm)Air pressure (MPa)Current (A)Voltage (V)
116 (1.6)0.5–0.6180–22028–32

Diameters and packaging

Diameter: in (mm)Packaging: lb (kg)
116 (1.6)27.5 (12.5) (Vacuum pack spool)

Metallographic photos

ARK 90 microstructure
Spray coating cross-section microstructure. Left: 200x, right: 500x
Click here to download the datasheet for Kooben ARK 390.