- Description
Description
Type 2 Aluminized Steel Pipe: Pure Aluminum Coating for Maximum Atmospheric Corrosion Resistance
Type 2 aluminized steel pipe uses a near-pure aluminum coating (typically ≥99% Al) applied through a hot-dip process. Unlike Al-Si Type 1 coatings designed for high-temperature performance, Type 2 is optimized for atmospheric corrosion resistance and long-term outdoor durability.
It is widely used in construction, infrastructure, and outdoor engineering where exposure to rain, humidity, salt spray, and industrial pollution is continuous but operating temperature is relatively low.
1. Type 2 Coating Composition
| Component | Content | Function |
|---|---|---|
| Aluminum (Al) | ≥99% | Forms dense, self-healing Al₂O₃ protective oxide layer |
| Minor impurities | <1% | Trace elements depending on production process |
| Intermetallic layer | Thin Fe-Al interface | Ensures bonding between steel substrate and coating |
The coating relies on a stable oxide film (Al₂O₃) that naturally regenerates when damaged, providing long-term atmospheric protection.
2. Type 2 vs Type 1 Key Difference
| Feature | Type 2 (Pure Al) | Type 1 (Al-Si) |
|---|---|---|
| Main purpose | Atmospheric corrosion resistance | High-temperature performance |
| Coating composition | ≥99% Aluminum | Al-10%Si alloy |
| Temperature resistance | Moderate (~up to 300°C) | High (~up to 800°C) |
| Best use environment | Outdoor exposure | Thermal systems / exhaust |
3. Atmospheric Corrosion Performance
| Environment | Performance of Type 2 |
|---|---|
| Urban atmosphere | Excellent long-term durability |
| Industrial pollution | Strong resistance to acidic gases and moisture |
| Marine (salt spray) | Good protection with stable oxide regeneration |
| UV exposure / weathering | No coating degradation under sunlight exposure |
Type 2 coating performs particularly well in humid, rainy, and corrosive outdoor environments.
4. Mechanical & Fabrication Characteristics
| Property | Behavior |
|---|---|
| Formability | Good bending and rolling performance |
| Weldability | Requires coating control at weld zone |
| Surface durability | High resistance to scratching and oxidation |
| Maintenance | Low maintenance due to self-healing oxide film |
5. Typical Applications of Type 2 Pipe
| Industry | Application |
|---|---|
| Construction | Roof structures, curtain wall supports |
| Infrastructure | Highway guardrails, bridge components |
| HVAC / Ventilation | Outdoor air ducts and exhaust systems |
| Public Facilities | Stadium structures, outdoor frameworks |
6. Why Type 2 Performs Better Outdoors
| Mechanism | Result |
|---|---|
| Al₂O₃ oxide formation | Dense barrier blocks oxygen and moisture |
| Self-healing behavior | Minor scratches re-oxidize automatically |
| Stable aluminum matrix | Long-term structural integrity in outdoor exposure |
7. Why Buyers Choose Teda Ganghua
At Teda Ganghua, we supply Type 2 aluminized steel pipes with controlled pure-aluminum coating thickness, stable adhesion performance, and consistent corrosion resistance for global infrastructure and outdoor engineering projects.
We support OEM cutting, custom lengths, and export packaging for construction and industrial buyers worldwide.
Explore our aluminized steel tube products here:
Aluminized Steel Tube Products
Conclusion
Type 2 aluminized steel pipe is the ideal solution for long-term outdoor corrosion resistance. With its pure aluminum coating and self-healing oxide layer, it delivers superior durability in atmospheric environments, making it a preferred choice for infrastructure and construction applications.
