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Galvanized vs Galvannealed When specifying doors that are to be exposed to corrosive environments it is important to know all the options available. Steel doors offer high performance and longevity. In most applications standard cold rolled steel, coated with rust inhibiting primer, will hold up well. When extra protection is needed galvanized steel is a consideration. The steel door industry offers A40, A60 and G90 as typical options. For harsher conditions you may consider fiberglass which I will cover via a separate post. Here is a brief explanation of some of the processes and terminology to assist you in selecting the best product for your application. A60 vs G90, That is the Question The most common specified are A60 and G90. To understand the difference let’s start with ...