The carbon content of hot-rolled steel sheets can be slightly higher than that of cold-rolled steel sheets. The density is the same when the composition is not much different. However, if the composition is very different, such as stainless steel, the density of cold-rolled and hot-rolled steel plates is about 7.9g/cm3. The specifics depend on the composition. The hot-rolled steel plate is only more ductile, and the steel is also subjected to pressure.

Hot-rolled steel plates are divided into structural steel, low-carbon steel, and welded bottle steel. Then, you can find the steel you need according to various steel materials, and check the density and composition of specific steel materials.

The hot-rolled steel plate has low hardness, easy processing and good ductility.

Cold-rolled sheet has high hardness and is relatively difficult to process, but it is not easy to deform and has high strength.

The strength of hot-rolled steel plate is relatively low, and the surface quality is poor (with oxidationlow finish), but the plasticity is good, generally medium and thick plate, cold-rolled plate: high strength, high hardness, high surface finish, generally thin plate, can be used as stamping Use board.

The production process of hot-rolled steel plate and cold-rolled steel plate is different. Hot-rolled steel sheets are rolled at high temperatures, and cold-rolled steel sheets are rolled at room temperature. Generally speaking, cold-rolled steel sheets have better strength, and hot-rolled steel sheets have better ductility. The general thickness of cold rolling is relatively small, and the thickness of hot rolling can be larger. The surface quality, appearance, and dimensional accuracy of cold-rolled steel sheets are superior to those of hot-rolled sheets, and the thickness of the products can be rolled down to about 0.18mm, so they are more popular. For product acceptance, you can ask professionals to carry out.

The mechanical properties of hot-rolled steel sheets are far inferior to those of cold-worked and forged, but they have better toughness and ductility.

Due to a certain degree of work hardening, the cold-rolled steel plate has low toughness, but it can achieve a better yield ratio, and is used to cold-bend parts such as spring sheets. At the same time, because the yield point is closer to the tensile strength, there is no risk of danger during use. Predictability, prone to accidents when the load exceeds the allowable load.

1) The cold plate is processed by cold rolling, the surface is free of scale, and the quality is good. The hot-rolled steel plate is processed by hot-rolling, and the surface has oxide scales, and the thickness of the plate has a difference.

2) The hot-rolled steel plate has poor toughness and surface smoothness, and the price is relatively low, while the cold-rolled steel plate has good ductility and toughness, but is more expensive.

3) Rolling is divided into cold-rolled and hot-rolled steel plates, 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 rolled steel plate: hot rolling temperature and forging temperature

5) The surface of the hot-rolled steel plate without electroplating is dark brown, and the surface of the cold-rolled steel plate without electroplating is gray. After electroplating, it can be distinguished from the smoothness of the surface. The smoothness of the cold-rolled steel plate is higher than that of the hot-rolled steel plate.