Chemical Composition
Chemical Composition of Aluminized Steel is defined by the exact metals used.
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Aluminized steel is a carbon steel that has been hot-dip coated on both sides with aluminum-silicon alloy. This process assures a tight metallurgical bond between the steel sheet and the aluminum coating, producing a material with a unique combination of properties possessed neither by steel nor by aluminum alone. Aluminized steel shows a better behavior against corrosion and keeps the properties of the base material steel for temperature lower than 800°C (1,470 °F). For example, it is commonly used for heat exchangers in residential furnaces, commercial rooftop HVAC units, automotive mufflers, ovens, kitchen ranges, water heaters, fireplaces, barbecue burners, and baking pans.
Aluminized steel maintains its bright appearance throughout its life. It can also be in service for long periods of time at temperatures up to 900°F.
Benefits of Aluminized Steel Sheet
- Combines the strength of steel with the corrosion resistance of aluminum
- High temperature resistance
- Low coefficient of thermal expansion
- Good formability that allows rolling, bending, folding, and corrugating
Properties
Physical Properties of Aluminized Steel are defined by the exact metals used, as well as the processes used to produce the material.
About Type 1 and Type 2 Aluminized Carbon Steel
Two types of hot-dip are used (Type 1 and Type 2). The full characteristics of aluminized steel are defined by the exact metals used, as well as the processes (Type) used to produce the material.
Type 1 is hot-dip coated with a thin layer of aluminum / silicon alloy that has anywhere from 5% - 11% silicon. The silicon provides improved adhesion of the layers. Type 1 aluminized steel is designed for applications where heat resistance and corrosion resistance are needed. Physical Properties of Aluminized Steel are defined by the exact metals used, as well as the processes used to produce the material.
Type 2 is hot-dipped in commercially pure aluminum. Type 2 is designed for use where atmospheric corrosion resistance is needed.
Typical Uses
Type 1 - Hot-dip coated with a thin layer of aluminum/silicon alloy:
- Mufflers
- Furnaces
- Ovens
- Ranges
- Water Heaters
- Baking Pans
Type 2 - Hot-dip coated with commercially pure aluminum:
- Corrugated Roofing/Siding
- Grain Bins
- Drying Ovens
- Air-conditioner condenser housings
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