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The raw material of hot roll is slab (mainly is the continuous casting billet). After the heating by the roughing and finishing mill group, it finally becomes the strip steel. The hot steel strip which from the last rolling mill of the finish rolling through the laminar flow cooling system set to the suitable temperature, then rewinded into coil become the cold stainless steel coil.Depending on the different needs of users, the cold stainless steel coil be shaped into steel plate, leveling roll and longitudinal cutting steel belt products through different finishing production lines (flattening, straightening, transverse or longitudinal cut, inspection, weighing, packaging and marks, etc.) . Simply, a piece of steel billet after heating (there are the burning red hot steel bloom on TV) through rolling, then cutting, straightening become steel plate. This called hot rolled. Cold rolled: Its raw materials is hot rolled steel coil. Removing its oxide skin through the pickling then after tandem cold rolling mill, the final product is rolling hard roll. Due to the continuous cold deformation, the strength and plastic index of rolling hard roll is decline. Hardness and toughness is the opposite. So stamping performance will worsen, cold rolled coil can only be used to make simple deformed parts.

Rolling hard roll can be used as raw material of the hot galvanizing plant. Because hot dip galvanizing line all has annealed wire. The weight of rolling hard roll is in commonly 6 ~ 13.5 tons per coil. The pickled hot-rolled coil is continuous rolled at normal temperature. Inside diameter is 610 mm.

Features: Because there is no annealing treatment, its hardness is very high (HRB more than 90), mechanical processing performance is poor. It can only carry on the simple aeolotropic bending processing which is less than 90 degree (perpendicular to the winding direction).

Simply, cold rolled is in the based on processing hot rolled plate. Generally speaking, this is such a process, hot rolled - pickling - cold rolled.

Cold-rolled is processed by hot-rolled coil at normal temperature. Although the process of rolling also making steel heating up, it still called cold-rolled.

The mechanical property of cold-rolled which is processed by continuous deformation is poor and its hardness is too high. So it only can restore its mechanical properties by annealing. If it hasn’t anneal, it just called rolling hard roll. Rolling hard roll is generally used to make the product which are without bending or stretching.

1. The cold-rolled coil is processed by hot-rolled coil at normal temperature.

2. Simply, a piece of steel billet after heating (there are the burning red hot steel bloom on TV) through rolling, then cutting, straightening become steel plate.

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The difference of hot-rolled and cold- rolled