ARK 399 arc spray coating is an Fe-Cr-B alloy. It has excellent bond strength and it has high resistance against high temperature oxidation erosion wear due to its unique microstructure. Also, good corrosion resistance is among its features.

Main features

  • High temperature oxidation erosion wear resistance
  • High hardness and high wear resistance
  • High bond strength, no primer. A 2 mm thick coating can be prepared
  • Excellent corrosion resistance
  • Cost-effective

Typical applications

  • It is used for the spraying of CFBs and pulverized coal boilers
  • Fan blades
  • Steel converter hoods and flue ducts
  • Oil drilling equipment
  • Replacement of hard chrome plating

Chemical composition of deposited metal (%)


Mechanical properties

Bond Strength (MPa)
Acc. to ASTM C633-01
Micro-hardness (HV 0.1) Kg/mm²
55–57 (Low carbon steel substrate)916–1296

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 99 microstructure
Spray coating cross-section microstructure. Left: 100x, right: 200x
ARK 99 XRD results
XRD results
Click here to download the datasheet for Kooben ARK 399.