The difference between hot and cold boards! What is the difference between a cold and hot board?

The surface of the cold-rolled plate has a certain gloss, and it is relatively smooth to the touch, similar to the very common molten steel cup used to drink water, the cold-rolled plate has high hardness, and the processing is relatively difficult, but it is not easy to deform, and the strength is higher. Due to a certain degree of work hardening, the toughness of cold-rolled steel plate is low, but it can achieve a good yield ratio, which is used for cold-formed spring sheets and other parts, and because the yield point is close to the tensile strength, there is no foresight of the danger in the process of use, and accidents are prone to occur when the load exceeds the allowable load.

If the hot-rolled plate is not pickled, it is similar to the surface of many ordinary steel plates on the market, the rusted surface is red, and the non-rusted surface is purple-black (iron oxide scale). The cold-rolled plate has high hardness and is relatively difficult to process, but it is not easy to deform and has high strength. The mechanical properties of hot-rolled steel plate are far inferior to cold working, and are also inferior to forging processing, but they have better toughness and ductility.

The performance advantages of cold-rolled plate and hot-rolled plate are:

1. The accuracy is higher, and the thickness difference of cold-rolled strip does not exceed that.

2. Thinner size, cold-rolled thinnest rollable steel strip; Hot rolled is now the thinnest achievable.

3. The surface quality is superior, and the cold-rolled steel plate can even produce a mirror surface; The surface of the hot-rolled plate has defects such as iron oxide scale and pitting.

4. The cold-rolled plate can adjust its performance according to user requirements, such as tensile strength and process performance, such as stamping performance, etc.

Cold-rolled products and hot-rolled products are the difference between the previous process and the next process, hot-rolled products are the raw materials of cold-rolled products, cold-rolled will be pickled hot-rolled steel coils on the machine using a roller rolling mill, rolling are cold-worked forming, mainly the thick specifications of the hot-rolled plate rolled into a thin specification of the cold-rolled plate, usually such as the hot-rolled machine rolling can produce cold-rolled coil, the main principle is the use of extrusion principle forced deformation.

Tips: Jingrun metal materials **** production of cold rolled plate, hot rolled plate and other products, cold rolling and hot rolling are two different rolling technology, cold rolling is in the steel at room temperature for grinding, this steel hardness. Hot rolling is the steel being rolled at high temperatures.

Hot rolling is the need to heat the material during or before the rolling process, generally to heat to the recrystallization temperature, such as: more than 1000 degrees, etc.; Hot-rolled material products are basically rough, such as hot-rolled plates, the thickness is generally more than 3mm, the thinnest hot-rolled plates are basically around, hot-rolled products are often not high dimensional accuracy, and the surface quality is not too high.

Cold-rolled products are made of cold-rolled products as raw materials, generally cold-rolled sheets have high dimensional accuracy, excellent surface, good machinability, and the general thickness range is below, and the more common thickness range is, of course, there are also outside this range, but it is relatively rare.

In addition to the cold and hot plate and the smooth board, there are also trademark plates, polished plates, brushed plates, mirror plates, etc., and the differences between them are mainly as follows:

1. The difference between cold and hot plate: cold plate refers to the stainless steel plate when it is processed, and the steel plate is bent into the desired shape by the cold bending process; During the processing of hot rolled plates, the steel plate is first bent by hot bending, and then refined by cold bending technology to achieve the desired shape.

2. The difference between the smooth panel and the polished plate: the smooth panel refers to the surface of the stainless steel plate that is machined to make the surface smooth, but the polishing effect is not achieved; The polishing plate is to use a polishing machine to process the surface of the stainless steel plate, so that the surface of the surface can achieve the effect of bright high finish, and the visual effect is much better than that of the smooth panel.

3. The difference between the trademark plate and the brushed plate: the trademark plate refers to the letters and graphics engraved on the surface of the stainless steel plate, as well as the company's trademark; The brushed plate refers to the striped texture made on the surface of the stainless steel plate, so that the surface has a strong visual effect.

4. The difference between the mirror panel and the polished plate: the mirror panel refers to the special processing technology on the surface of the stainless steel plate, so that the surface of the mirror surface can achieve the effect of mirror smoothness; The polishing plate is to use a polishing machine to process the surface of the stainless steel plate, so that the surface can achieve the effect of bright and high gloss, but the finish is not higher than that of the mirror panel.

In addition to cold rolled plates, hot rolled plates and smooth plates, there are several other stainless steel plates, such as paint plates, polished plates, antibacterial plates, frosted boards, sand plates, etc. Each type of sheet has its special purpose and different properties, which determine the difference between them. The cold rolled plate has excellent corrosion resistance and can be used in the automotive, motorcycle and shipbuilding industries; Hot rolled board has good tensile strength and can be used in manufacturing industries such as aircraft, ships, automobiles, motorcycles, etc.; The light panel has an excellent appearance and can be used in furniture, kitchen utensils, household appliances, electronic products and other industries.

1. Generally speaking, after a billet is heated (that is, the kind of red and hot steel in TV), it is rolled several times, and then cut the edge and corrected into a steel plate, which is called hot rolling. Cold rolling is processed and rolled on the base of hot-rolled coils, generally speaking, it is hot-rolled--- pickled --- cold-rolled. Cold rolling is processed from hot-rolled plate at room temperature, although it will also heat up the steel plate due to rolling during the processing process, although it is still called cold rolling.

Due to the cold rolling formed by 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 those without annealing are called rolled hard coils. Rolled hard coil is generally used to make products that do not need to be bent, stretched, and rolled hard with the following thickness on both sides or four sides.

2. Hot-rolled plate is rolled above the recrystallization temperature. Cold-rolled coils are the rolling of hot-rolled coils below the recrystallization temperature. Cold-rolled plate is made of hot-rolled steel coil as raw material, after pickling to remove the oxide scale for cold continuous rolling, its finished product is rolled hard coil, due to the cold work hardening caused by continuous cold deformation, the strength and hardness of the rolled hard coil rise, and the toughness index decreases, so the stamping performance will deteriorate, and can only be used for simple deformation of parts.

Generally, cold-rolled plate is annealed continuously to restore its plastic toughness. Generally, the strength of the steel plate after cold-rolled annealing is higher than that of the original hot-rolled plate. The surface quality of cold-rolled coil is much higher than that of hot-rolled coil.

Since cold-rolled coil is made of pickled hot-rolled coil as raw material, the surface quality of cold-rolled plate is much higher than that of hot-rolled coil, and it is more suitable for steel plates with high surface quality requirements such as home appliance plates and automobile plates.

Cold-rolled plate is also called cold plate, and the main materials are Q195A-Q235A, Q195AF-Q235AF, Q295A(B)-Q345 A(B); spcc、spcd、spce、st12-15;DC01-06, the main use of cold plateCold rolled plate strip is widely used, such as automobile manufacturing, electrical products, rolling stock, aviation, Jingyou selling dense instruments, food canning, etc. Cold-rolled coil is made of hot-rolled coil as raw material, rolled at room temperature below the recrystallization temperature, including plate and coil, which can be produced by many domestic steel mills such as Baosteel, Wuhan Iron and Steel, Anshan Iron and Steel, etc. Among them, the one delivered in one sheet is called the differential grinding steel plate, also known as the box plate or flat plate; The one that is very long and delivered in coils is called steel strip, also known as coil plate.

The cold-rolled steel plate is relatively thin!

The steel plate of Reza is relatively thick!

Baosteel, Anshan Iron and Steel, Benxi Iron and Steel, Wuhan Iron and Steel, Handan Iron and Steel, Baotou Iron and Steel, Tangshan Iron and Steel, Lianyuan Iron and Steel, Jinan Iron and Steel and other cold-rolled ordinary thin steel plates: made of ordinary carbon structural steel or low-alloy structural steel cold-rolled. The surface quality of the cold-rolled plate is better.

It has good stamping performance. The requirements should be to ensure that the cold bending and cup tests are qualified, and they are often used in automotive and other industries and raw materials for plated plates.

Cold-rolled high-quality steel plate: mainly including various high-quality steel cold-rolled sheets, the most commonly used is carbon structural steel plates, especially cold-rolled sheets for deep drawing, which are cold-rolled sheets made of low-carbon high-quality steel 08al, and the steel plates are divided into three groups according to surface quality; , respectively represents a particularly high-level, high-grade, higher finishing surface, according to the drawing level is divided into ZF, HF, F grade (on behalf of the most complex, very complex, complex parts used for punching drawing), according to the thickness of the steel plate allowable deviation, and divided into A, B two levels of precision, widely used in the automobile tractor industry.

Cold-rolled steel plate, with smooth surface and excellent processing, is used in automobiles, refrigerators, washing machines and other household appliances, as well as industrial equipment and various building materials. With the development of the economy, cold-rolled steel plate has been known as a necessary material in modern society.