There are several types of steel doors, made with one of three types of steel; galvanized, galvannealed, or cold rolled.
Here are the differences:
Galvanized steel: In this process, carbon steel is coated with a layer of full zinc alloy, which offers good rust protection.
Galvannealed steel: This contains an iron-zinc alloy applied in a hot-dip process. It’s easy to paint these doors since they have a matte finish.
Cold rolled steel: The mill process used for cold rolled steel makes it stronger but it is better for interior steel doors.
There are also thermally broken steel doors, which use two layers of steel separated by insulation to reduce thermal conductivity, keeping your home at the perfect temperature year-round.
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