What types of steel are used in commercial steel doors?

The three most common steel types are cold rolled steel, galvannealed steel, and galvanized steel.

  1. Cold Rolled Steel (CRS) is suitable for most interior applications, is uncoated steel and requires a coat of primer.
  2. Galvannealed Steel (A) is basic steel coated with an iron-zinc alloy. 
    • It provides excellent corrosion protection when combined with a coating of quality prime paint and is adequate for most interior and exterior applications.  
    • SDI recommends use of the A Type, both A40 and A60, for primer adhesion. 
    • A60 is superior to A40 for inhibiting rust.
  3.  Galvanized Steel (G) is basic steel treated with a full zinc alloy. 
    • It provides superior rust protection but has poor adhesion properties for prime or finish paint. 
    • Even though galvanized (G90) steel is often specified for causal areas and areas of excessive corrosion, it is not recommend because of inferior primer adhesion properties, poor welding capabilities and excessive weld show.

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