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Understanding the Different Types of Coated Steel

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The most common coated steel products are metal coated steels. Their manufacture typically uses cold- rolled steel (although a small percentage is made from hot rolled coil or sheet) which is then coated with zinc or with tin. A further coating is often added to zinc-coated steel in a subsequent process step to produce colour-coated steels.

Zinc Coated Steels

There are several distinct types of zinc coating (or galvanizing). These are

  • Continuous hot dip galvanizing: in this process, a cold-rolled coil or sheet in immersed in a pot of molten zinc. A common manufacturing technique for hot dip galvanizing steel is the Sendzimir process (which uses a small quantity of aluminium in the coating). Continuous hot dip galvanizing is presently the most popular method of producing coated steels. Typical applications of these steels include construction (roofs, walls – often as sandwich panels), auto body components (exposed panels), fabrication (metal cabinet frames and walls), agriculture (outhouses, livestock buildings, silos), heating and ventilation (casings, air ducts); and it is very common for the galvanized steel to be further coated (see below) for many of these uses.

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