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20 Ga Aluminized Steel
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20 gauge aluminized steel is a thin-gauge aluminum-silicon coated steel material widely used in light structural applications, HVAC systems, ducting, automotive components, and exhaust-related tubing. When manufactured into tube form, it is commonly referred to as aluminized steel tube or aluminized pipe.
Due to its thin wall thickness, 20 gauge aluminized steel is particularly suitable for lightweight, corrosion-resistant, and heat-resistant tubular structures.
20 Gauge Thickness Reference
The wall thickness of 20 gauge aluminized steel is generally standardized as follows:
| Gauge System | Thickness (mm) | Thickness (inch) |
|---|---|---|
| US Standard (ASTM) | 0.91 mm | 0.036 in |
| Industrial Tolerance Range | 0.85 – 0.95 mm | — |
| Typical Application Level | Thin-wall tubing | — |
This thin wall design makes it ideal for air flow systems and lightweight structural tubes.
Common Aluminized Steel Tube Sizes
20 gauge aluminized steel tubes are produced in a wide range of diameters depending on application requirements.
Standard Outer Diameter (OD) Range
| Tube Type | Outer Diameter (mm) | Typical Use |
|---|---|---|
| Small Diameter Tube | 12.7 – 25.4 mm | Sensors, small exhaust lines |
| Medium Diameter Tube | 25.4 – 63.5 mm | HVAC ducting, automotive systems |
| Large Diameter Tube | 63.5 – 152.4 mm | Industrial exhaust, ventilation systems |
Common Wall Thickness Combination
Although 20 gauge is standardized, final tube specifications may vary slightly depending on forming method and application.
| Tube Size Category | Wall Thickness | Characteristics |
|---|---|---|
| Light-duty tubes | ~0.9 mm (20 Ga) | Flexible, lightweight, easy forming |
| Reinforced tubes | 20 Ga + reinforcement | Higher durability for vibration areas |
| Custom tubes | 0.8–1.0 mm | Application-specific design |
Standard Length Specifications
Aluminized steel tubes are typically supplied in standard or customized lengths:
- 1000 mm
- 2000 mm
- 3000 mm
- 6000 mm (common industrial standard)
- Custom cut lengths available
Common Tube Shapes
20 gauge aluminized steel is not limited to round pipes; it can also be formed into various profiles:
- Round tubes (most common)
- Oval tubes (automotive exhaust systems)
- Rectangular ducts (HVAC systems)
- Custom formed profiles (industrial equipment)
Dimensional Tolerance
| Parameter | Typical Tolerance |
|---|---|
| Outer Diameter | ±0.1 – ±0.5 mm |
| Wall Thickness | ±0.05 – ±0.1 mm |
| Length | ±1 – ±5 mm |
| Ovality | Controlled within industrial standard |
Application Areas
20 gauge aluminized steel tubes are widely used in:
- Automotive exhaust systems
- HVAC air duct systems
- Industrial ventilation pipelines
- Heating equipment tubing
- Light structural exhaust piping
- Agricultural machinery ventilation components
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