Characteristics of cold rolled steel sheet-Process principle of cold rolled steel plate

Comparison of cold rolled steel sheet and hot rolled steel sheet

Time：2021-09-13 Source：Wuxi Hongwang Hits：232

Hot rolled plate and cold rolled plate

1. The cold plate is processed by cold rolling, and the surface has no oxide skin, and the quality is good. The hot plate is processed by hot rolling, and the surface has oxide scale, and the thickness of the plate is lower.
2. The hot-rolled sheet has poor toughness and surface smoothness, and the price is lower, while the cold-rolled sheet has good stretchability and toughness, but the price is more expensive.
3. Rolling is divided into cold rolling and hot rolling, with the recrystallization temperature as the distinguishing point.
4. Cold rolling: cold rolling is generally used to produce strips, and its rolling speed is relatively high; hot rolling: the temperature of hot rolling is similar to that of forging.
5. The surface of the non-plated hot-rolled board is dark brown, and the surface of the non-plated cold-rolled board is gray. After electroplating, it can be distinguished from the smoothness of the surface. The smoothness of the cold-rolled board is higher than that of the hot-rolled board.
6.Hot-rolled sheet has relatively low strength and poor surface quality (oxidation\low finish), but good plasticity, generally medium-thick plate, cold-rolled sheet: high strength\high hardness, high surface finish, generally thin sheet, can be As a stamping board.
7. Hot-rolled steel plates are divided into thick plates (thickness greater than 4mm) and thin plates (thickness 0.35~4mm); cold-rolled steel plates only have thin plates (thickness 0.2-4mm).

cold rolled steel sheet

Hot rolled coil and cold rolled coil

Cold-rolled coils are made of hot-rolled steel coils, which are pickled to remove oxide scale and then cold rolled. The finished product is hard-rolled coils. The strength and hardness of the hard-rolled coils increase due to cold work hardening caused by continuous cold deformation. , Tough plastic index declines, so the stamping performance will deteriorate, can only be used for simple deformed parts. Cold rolling is processed from hot-rolled sheets at room temperature. Although the rolling process will heat up the steel plate, it is still called cold rolling. Because the hot rolling is cold rolled after continuous cold deformation, the mechanical properties are relatively poor and the hardness is too high. It must be annealed to restore its mechanical properties, and the ones that are not annealed are called rolled hard coils. Rolled hard coils are generally used to make products that do not need to be bent or stretched.

Hot-rolled coils are made of slabs (mainly continuous casting billets) as raw materials. After heating, they are made into strip steel by the rough rolling mill and the 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 strip coil by a coiler, and the cooled steel strip coil. Due to the high strength, good toughness, easy processing and good weldability and other excellent properties of hot-rolled steel products, Beibei is widely used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, and pressure vessels.

Hongwang Investment Group is an enterprise specializing in the production of stainless steel cold-rolled coils and stainless steel surface finishing products. The company is equipped with five-stand 18 continuous rolling mill, three-stand 18 continuous rolling mill continuous annealing and pickling line, 850 six-stand 6 continuous rolling mill and other advanced equipment, and 1450mm hot and cold annealing and pickling line, four continuous rolling mill and 20-roller Rolling mills, etc. The core products are 200, 300, 400 series stainless steel cold-rolled coils, whole coils and plate surface finishing products. The products are widely used in tableware, kitchen utensils, medical equipment, household appliances, auto parts, architectural decoration and other fields. The products are popular at home and abroad with excellent product quality and good reputation. Look forward to working with you!

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