What is the difference between hot-dip galvanized steel coil and cold-rolled steel coil?Hot-dip galvanized steel coil is made of slab (mainly continuous casting billet) as raw material. After heating, it is made into strip steel by rough rolling mill and finishing mill. The hot steel strip from the last rolling mill of finishing rolling is cooled to a set temperature by laminar flow, and then coiled into a steel coil by a coiler.
304 Stainless Steel versus 409 Stainless Steel304 is an austenitic stainless steel high in chromium and nickel with very high corrosion resistance. It is one of the most commonly produced and used stainless steel grades. 409 is a ferritic stainless steel with less chromium and very little nickel. It less expensive to produce than 304, but also provides less corrosion resistance.