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Aluminized Rectangular Pipe
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An Aluminized Rectangular Pipe is a rectangular hollow steel tube coated with an aluminum-silicon alloy through a hot-dip aluminizing process. The aluminized coating provides excellent heat resistance, oxidation resistance, and corrosion protection, making the pipe suitable for high-temperature and industrial applications.
Aluminized rectangular pipes are widely used in automotive exhaust systems, industrial ventilation ducts, structural frames, HVAC systems, furnace equipment, and heat-resistant pipeline systems. Compared with ordinary carbon steel tubing, aluminized rectangular pipes offer longer service life and improved thermal durability.
What Is an Aluminized Rectangular Pipe?
Aluminized rectangular pipe is manufactured from low-carbon steel strip or structural steel sheet, then formed into rectangular tubing and coated with an aluminum-silicon layer. The coating improves resistance to scaling, thermal fatigue, and surface corrosion.
These pipes are commonly supplied in welded hollow sections with different wall thicknesses, widths, and lengths according to industrial requirements.
Common Specifications of Aluminized Rectangular Pipe
Aluminized rectangular pipes are available in a wide range of dimensions for exhaust, structural, and ventilation applications.
| Width × Height | Wall Thickness | Common Length |
|---|---|---|
| 20 × 10 mm | 0.8–2.0 mm | 1–6 m |
| 30 × 20 mm | 1.0–2.5 mm | 1–6 m |
| 40 × 20 mm | 1.0–3.0 mm | 1–12 m |
| 40 × 30 mm | 1.2–3.0 mm | 1–12 m |
| 50 × 25 mm | 1.2–4.0 mm | 1–12 m |
| 50 × 30 mm | 1.2–4.0 mm | 1–12 m |
| 60 × 40 mm | 1.5–5.0 mm | 1–12 m |
| 80 × 40 mm | 1.5–5.0 mm | 1–12 m |
| 100 × 50 mm | 2.0–6.0 mm | 1–12 m |
| 120 × 60 mm | 2.0–6.0 mm | 1–12 m |
| 150 × 100 mm | 2.0–8.0 mm | 1–12 m |
| 200 × 100 mm | 3.0–10.0 mm | 1–12 m |
Custom sizes, laser cutting, pipe bending, punching, and welding services are also commonly available for industrial fabrication projects.
Common Grades of Aluminized Steel Pipe
| Standard | Grade | Features |
|---|---|---|
| ASTM A463 | Type 1 | Excellent heat resistance |
| EN 10346 | DX51D+AS | Good weldability |
| EN 10346 | DX52D+AS | Improved forming performance |
| EN 10346 | DX53D+AS | Deep drawing capability |
| JIS G3315 | Type 1 | High temperature durability |
| GB/T 2518 | AS Coated Steel | Oxidation resistance |
Surface Characteristics
The aluminized coating typically has a silver-gray metallic appearance with strong reflective properties. The aluminum-silicon layer protects the steel substrate from oxidation and high-temperature corrosion.
Common coating types include:
- Aluminized Type 1
- Aluminum-Silicon Coating
- Heat Resistant AS Coating
Main Advantages of Aluminized Rectangular Pipe
Excellent Heat Resistance
Aluminized steel pipes maintain stable performance under elevated temperatures and thermal cycling environments.
Strong Oxidation Resistance
The aluminum coating forms a dense oxide layer that protects the steel surface from scaling and rust.
Good Fabrication Performance
Aluminized rectangular pipes can be welded, cut, punched, bent, and fabricated into different structural and exhaust components.
Long Service Life
Compared with ordinary carbon steel tubing, aluminized rectangular pipes provide improved durability in humid and high-temperature conditions.
Common Applications
Aluminized rectangular pipes are widely used in:
- Automotive exhaust systems
- Industrial ventilation ducts
- Furnace structures
- HVAC systems
- Heat exchangers
- Chimney systems
- Agricultural drying equipment
- Structural support frames
- Thermal processing equipment
Aluminized Rectangular Pipe vs Galvanized Rectangular Pipe
| Property | Aluminized Pipe | Galvanized Pipe |
|---|---|---|
| Coating Material | Aluminum-Silicon | Zinc |
| Heat Resistance | Excellent | Moderate |
| Oxidation Resistance | Excellent | Moderate |
| Surface Finish | Silver matte finish | Bright zinc finish |
| Main Application | Exhaust and heating systems | Structural and water systems |
| Service Temperature | Higher | Lower |
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