Glossary of CR, GLM, GA, GI, PO Steel Coils
Cold Rolled Steel(CR): Flat rolled steel products for which the final required thickness has been obtained by rolling base hot rolled pickled substrate at room temperature. This is accomplished by passing the steel through work rolls under tremendous pressure which tightens thickness tolerances, improves shape and surface quality. The initial product comin g through the work rolls is called Cold Rolled Full Hard and from there the coils will need to be Annealed in order to become fully processed Cold Rolled Steel. Galvalume (GLM): Sheet steel is coated with aluminum-zinc alloy using the continuous hot-dipped process similar to the process used to make galvanized steel. The nominal coating composition is 55% aluminum and 45% zinc. Galvalume has superior corrosion resistance which is achieved by the intricate microscopic formation of zinc-rich and aluminum-rich zones within the coating. The aluminum provides long-term durability and zinc the corrosion protection. Galvalume...
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