Introduction
ARK 250 is a wear-resistant, corrosion-resistant coating of high-carbon martensitic stainless steel that resists high temperature oxidation and has a high bond strength. [Patented product: Hot-sprayed wire with core-iron alloy containing rare earth elements ZL96120778.7 (The first patent for thermal spraying powder core wire in China)].
Main features
- High bonding strength
- Good wear and corrosion resistance
- The coating is suitable for cutting and grinding
Typical applications
- Boiler tubes for pulverized coal-fired boilers – High temperature erosion wear resistance, sulfur corrosion resistance
- Papermaking dryers – Good wear resistance, corrosion resistance, and no bright spots after coating grinding
- Printing rollers – Wear and corrosion-resistant coatings
- Wear-resistant treatment of part surfaces and dimensional restoration
Chemical composition of deposited metal (%)
| C | Cr | Ni | Other | Fe |
|---|---|---|---|---|
| 0.6–0.8 | 13.0–15.0 | 1.0–3.0 | <1.0 | Balance |
Mechanical properties
| Bond Strength (MPa) Acc. to ASTM C633-01 | Micro-hardness (HV 0.1) Kg/mm² |
|---|---|
| >53 (Low carbon steel substrate) | 480–520 |
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 250. |
