Hot rolled coil is produced via continuous casting process of slabs. It is used as base material for cold rolled coil and coated coil, but it could also be used in industrial applications such as steel tubes, construction, shipbuilding, gas containers, pressure vessels and energy pipelines.
Cold rolled coils receives an additional treatment after it has been hot rolled, pickled and oiled. The coils moves into a series of rollers to lower its thicknesses and to have uniform surface smoothness. The process is done at room temperature. Cold rolled coils can then be further annealed to soften the steel. These characteristics, depending on the end-use, change with the intensity of the annealing.
After Passing cold rolled coil through a melted zinc bath, in order to coat the steel with a thin layer of zinc to provide corrosion resistance, is called hot dip galvanizing.It has many applications in construction/building, roofing, automotive parts, sections, profiled sheets, etc…
Pre-painted steel is a Galvanized steel with a number of paint layers and treatments in a carefully controlled environment in a continuous coil coating line.Pre-painting coating can also be done on electrogalvanized coils and cold rolled coils depending on the requirement of end-use and application of the steel.