Hot Rolled Coil and Cold Rolled Coil: Significant Differences In Process, Performance and Application

In the steel industry, hot -rolled rolling and cold rolling rolls are two common materials. They have significant differences in production processes, performance characteristics, and application fields. This article will explore the differences between these two materials in detail to help readers better understand their respective advantages and applicable scenarios.

1. Differences in production technology

Hot -rolled rolling rolling: The production process of hot rolling roll involves heating the billet to high temperature and rolled. Specific steps include the use of cast board or first rolling plate as raw materials. After the step -type heating furnace heating, the high -pressure water is removed and entered the rolling machine. Rolling, finally through layer flow cooling and rolling machine rolls into straight hair rolls. In this process, the billet has good plasticity and ductility at high temperatures, and it is easy to rolled and formed.

Cold rolling rolling: The production of cold rolling rolls is based on hot rolling rolls, rolled at room temperature at the backcreasing temperature. Cold rolling roll is a steel zone that is directly rolled by rolling rolling at room temperature and rolled into the entire roll with a roll -up machine. Compared with the hot rolling rolling rolling roll, the cold rolling roll production process does not heal, so there are no defects such as hemp points and iron oxide skin often appeared in hot rolling.

2. Different performance characteristics

Accuracy and thickness: Due to the cold processing characteristics in the production process, the accuracy and thickness control are more accurate, and the steel rolls with thinner thickness and higher accuracy can be produced. The accuracy and thickness of the hot rolling roll are relatively low. The head and tail of the straight hair volume are often tongue and fishtails, and the thickness and width accuracy are poor.

Mechanics performance: Cold rolling rolls have higher strength, hardness and better stretching performance, and their mechanical properties are superior. Although the hot rolling roll also has high strength and toughness, its mechanical properties are relatively low compared to cold rolling volumes.

Surface quality: The surface quality of cold rolling rolls is smoother, without obvious defects, and it is easy to perform coating and coating. The surface quality of the hot rolling roll is relatively poor, and there are often defects such as wave -shaped, folding, and tower shapes.

Corrosion resistance: After the cold rolling rolling roll is low, the corrosion resistance is better. The corrosion resistance of hot rolling rolls is relatively poor, because defects such as iron oxide skin that may exist on the surface will affect its corrosion resistance.

3. Differences in the application field

(1) Cold rolling volume: Due to its superior mechanical properties and accuracy, cold rolling rolls are widely used in the fields of construction, automobiles, machinery, light industry and other fields.

1. Car manufacturing: Because of its high accuracy and high intensity, it has a wide range of applications in automobile manufacturing. It is used to manufacture key components such as car body panels, wheels and wheels to ensure the safety and comfort of the car.
2. Electric products: Cold rolling rolls are also used to manufacture key components of electrical equipment such as motors and transformers. Its good conductivity and mechanical performance can meet the high requirements of electrical equipment for materials.Precision instrument: In the field of precision instrument manufacturing, the high precision and good surface quality of cold rolling rolls make it the first choice for manufacturing precision parts and structural parts.
3. Canned food: Cold rolling rolls are also used to manufacture the bottom cover, side seal and other components of canned food. Its good corrosion resistance and sealingability can ensure the safety of food and preservation.
4. Architectural field: Although hot rolling rolls are also widely used in buildings, because of its superior surface quality and accuracy, cold rolling rolls are also used on roofs, exterior walls, doors and windows, etc. Site.

(2) Hot -rolled rolling rolls: Hot rolling rolls are mainly used to require small structural parts and mechanical parts, such as steel bars, roof panels, groove steel, steel pipes, etc.

1. The construction industry: The hot rolling rolling roll is widely used in the construction industry and used in the manufacturing of various structural parts, such as the construction of buildings, bridges, roads and other infrastructure. Its high strength and toughness make it an ideal choice for supporting structures.
2. Shipbuilding: Because hot -rolled steel rolls have a high -strength weight ratio, it is very suitable for the shipbuilding industry, which can reduce the weight of the hull and improve the efficiency of navigation.
3. Pipelines and pressure vessels: The height of the height of hot -rolled steel rolls and abrasion resistance makes it an ideal material for manufacturing pipelines and pressure vessels, which can ensure long -term stable operation in harsh environments.
4. Mechanical parts: Hot -rolled steel rolls are also used to make various mechanical parts, such as gears and bearings. Its good mechanical properties can meet the needs of various complex conditions.

Comparison summary

Accuracy and surface quality: Cold rolling rolls are better than hot rolling rolling volume in terms of accuracy and surface quality, so it is more suitable for areas with higher accuracy and appearance requirements, such as car manufacturing, electrical products and precision instruments.
Strength and toughness: The hot rolling roll is good in terms of strength and toughness. It is suitable for areas that need to withstand large loads and stress, such as buildings, shipbuilding and pipelines.
Cost: The production cost of hot rolling rolls is relatively low, so it has a competitive advantage on price -sensitive occasions. Although the cost of cold rolling volume is high, it can provide higher product quality and added value.

In summary, there are significant differences in the production process, performance characteristics, and application fields of hot rolling rolls and cold rolling rolls. When selecting and using, select and use according to specific needs and uses. For example, in the absence of high precision and high intensity, cold rolling rolls should be selected; in cases with low requirements and sensitive price, you can choose hot rolling rolls.

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