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Aluminized Metal
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Aluminized metal refers to steel coated with an aluminum–silicon alloy (Al-Si). This type of steel, also called aluminized steel Type 1, combines the strength of steel with heat resistance, oxidation protection, and moderate corrosion resistance, making it ideal for automotive, industrial, and heating applications.
1. Common Aluminized Steel Grades
| Grade | Coating Type | Key Properties | Typical Applications |
|---|---|---|---|
| ASTM A463 T1 | Al-Si Alloy (Type 1) | High heat resistance (650–800°C), oxidation-resistant, moderate ductility | Automotive exhausts, furnace panels, industrial ovens |
| T1 20 | Al-Si Alloy | Good tensile strength, moderate elongation, heat-resistant | Automotive mufflers, catalytic converter covers |
| T1 40 | Al-Si Alloy | Higher thickness, increased mechanical strength, excellent heat tolerance | Industrial burners, high-temperature ducts |
Note: Al-Si coating content typically ranges 5–11% Si with the remainder aluminum.
2. Chemical Composition
| Element | Typical Range (%) | Notes |
|---|---|---|
| Carbon (C) | ≤ 0.15 | Low carbon ensures ductility and formability |
| Manganese (Mn) | 0.30–0.60 | Improves tensile strength and toughness |
| Phosphorus (P) | ≤ 0.035 | Reduces brittleness |
| Sulfur (S) | ≤ 0.035 | Minimizes surface defects |
| Silicon (Si) | 5–11 | Part of the aluminum–silicon coating for heat resistance |
| Aluminum (Al) | 89–95 | Forms protective metallurgical bond with steel |
3. Mechanical Properties
| Property | Typical Value | Notes |
|---|---|---|
| Yield Strength | 170–280 MPa | Depends on base steel thickness |
| Tensile Strength | 300–400 MPa | Adequate for stamping, forming, and structural applications |
| Elongation | 25–35% | Supports bending, deep drawing, and roll forming |
| Hardness | 60–80 HRB | Surface hardness influenced by coating thickness |
| Coating Adhesion | Excellent | Prevents peeling or flaking under heat exposure |
4. Applications of Aluminized (Al-Si) Steel
Aluminized metal is preferred where heat resistance and oxidation protection are essential:
Automotive Industry: Exhaust systems, mufflers, catalytic converter covers, heat shields
Industrial Heating Equipment: Furnace panels, oven linings, industrial burners, heat exchangers
Electromechanical Devices: Components exposed to high temperatures
Commercial and Industrial Ovens: Baking and heating equipment requiring long-term thermal stability
5. Advantages of Aluminized Metal
High heat and oxidation resistance – withstands temperatures up to 800°C
Moderate corrosion resistance – suitable for indoor or mildly corrosive environments
Strong steel core – maintains structural integrity while coated
Formable and weldable – suitable for pipes, sheets, and complex components
Durable and long-lasting – extends service life in harsh thermal conditions
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