Introduction
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 (%)
| C | Ni | B | Si | Other | Fe |
|---|---|---|---|---|---|
| <1.0 | <1.0 | <5.0 | <1.0 | <1.0 | Balance |
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 |
|---|---|---|
| 7.48 | <5 | 70–85 |
Recommended spraying parameters
| Diameter: in (mm) | Air pressure (MPa) | Current (A) | Voltage (V) |
|---|---|---|---|
| 1⁄16 (1.6) | 0.5–0.6 | 180–220 | 28–32 |
Diameters and packaging
| Diameter: in (mm) | Packaging: lb (kg) |
|---|---|
| 1⁄16 (1.6) | 27.5 (12.5) (Vacuum pack spool) |
Metallographic photos
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| Click here to download the datasheet for Kooben ARK 390. |
