Hot rolled plate VS cold rolled plate

Hot rolling and cold rolling are both steel plate or profile forming processes, and they have a great influence on the structure and properties of steel. The rolling of steel is mainly hot rolling, and cold rolling is usually only used to produce small-size steel and thin-plate precision steel. Today we have a closer look at what is hot rolling? What is cold rolling?

Hot rolled plate
Hot rolled coils are made of slabs (mainly continuous casting slabs) as raw materials, and after heating, they are made into strip steel by rough rolling units and finishing rolling units. The hot steel strip from a rolling mill of the finishing mill is cooled to the set temperature by laminar flow, and then rolled into a steel strip coil by the coiler, and the cooled steel strip coil. According to the different needs of users, after processing through different finishing lines (leveling, straightening, cross-cutting or slitting, inspection, weighing, packaging and marking, etc.), it becomes steel plate, flat coil and slitting steel strip products.

With the increasing maturity of hot-rolling dimensional accuracy, shape, surface quality and other new control technologies and the continuous emergence of new products, hot-rolled steel plate and strip products have been more and more widely used and have become stronger and stronger in the market. Competitiveness.

Cold rolled plate
Cold rolling is made of hot-rolled coils as raw materials, which are rolled at room temperature below the recrystallization temperature. Cold-rolled steel sheets are steel sheets produced through the cold rolling process, referred to as cold plates. The thickness of the cold-rolled sheet is generally between 0.1 and 8.0mm. The thickness of the cold-rolled sheet produced by most factories is less than 4.5mm. The thickness and width of the cold-rolled sheet are determined according to the equipment capacity and market demand of each plant.

The difference between hot rolled plate and cold rolled plate

Since cold rolled plates are rolled at room temperature, no oxide scales are produced. Therefore, the cold rolled plate has good surface quality and high dimensional accuracy. Combined with annealing treatment, its mechanical properties and process performance are superior to hot rolled thin steel plates in many fields. In particular, the field of home appliance manufacturing has gradually replaced hot-rolled thin steel plates with it.

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