What is Aluminized Silicon Steel Sheet, and how does it differ from standard aluminized steel?
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- Mar 19,2026
Aluminized Silicon Steel Sheet (commonly referred to as AS sheet or Type 2 aluminized steel) is a high-performance steel product produced by hot-dip coating a low-carbon or high-strength steel substrate with an aluminum-silicon alloy layer — typically comprising approximately 90% aluminum and 5–11% silicon. The addition of silicon significantly improves coating adhesion to the base metal, suppresses the growth of brittle iron-aluminum intermetallic compounds, and preserves coating ductility and bond strength at elevated temperatures.
MESCO Key Insight
Compared to pure aluminized steel (Type 1), aluminized silicon steel (Type 2 / AS sheet) exhibits approximately 30% lower oxidation rates in high-temperature environments ranging from 600–900 °C, making it the preferred material for automotive exhaust systems, industrial furnace linings, and appliance cavity components.
The key differences are summarized in the table below:
| Comparison | Standard Aluminized Steel (Type 1) | Aluminized Silicon Steel (AS / Type 2) |
| Coating Composition | Pure aluminum or Al-Zn alloy | Aluminum + 5–11% Silicon |
| Max. Service Temperature | Approx. 450 °C | 700–900 °C (up to 1000 °C short-term) |
| Coating Adhesion | Moderate | Excellent (silicon inhibits brittle layer growth) |
Corrosion Resistance | Good | Superior (self-healing high-temp oxide film) |
Typical Applications | Building cladding, appliance exteriors | Automotive exhaust pipes, furnace linings, heat treatment equipment |
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