Types of Steel and Cores

When you are in the market for steel doors, take the time to conduct research and educate yourself on the options. Not all steel doors and cores are created equal. It is widely accepted that steel is a superior building material known for durability, security, and safety features. Determining the correct type of steel door and core for your needs is necessary to utilize your resources appropriately.

types of steel

The three most commonly used types of steel for doors are cold rolled steel, galvannealed steel, and galvanized steel. For interior purposes, cold rolled steel doors are often used and require a coating of primer since it is uncoated steel. Galvannealed steel is coated with iron-zinc alloy and provides the greatest protection against corrosion when you add a coat of primer. This is suitable for both interior and exterior purposes. Galvanized steel is coated with full zinc alloy to provide the ultimate protection against rust and corrosion. The full zinc coating makes it difficult to prime and paint the door. This should be factored into the decision making process when considering the appropriate type of steel door.


Once you determine the appropriate type of steel door, the next step is to select the right type of core. The characteristic of steel doors that may be most unfamiliar is located within the door itself at its core. The core of a steel door is essential to function, performance, and longevity of the door. While most doors appear similar on the exterior surface, the inner core is the differentiating factor of consideration when making a purchase.


Core types have specific features and functions that separate steel doors from one another. The most common types of cores for steel doors include honeycomb, polystyrene, polyurethane, steel stiffened, and temperature rise. The type of core used within the door is critical to prevent wasted time, money, and resources.


Honeycomb cores are hexagon shaped cells treated to be resistant to insect intrusion and decay while providing sound buffering properties and insulation. A honeycomb core within the steel door is suitable for interior or exterior use.


Polystyrene cores are slabs that are most well known for insulation performance. The polystyrene core can withstand significant temperature differences between each side of the door. The extreme temperature differences and sustainability may cause problems if customized paint is applied. There is a risk of melting the core that needs to be considered with caution.

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