Hss rolls materials and characteristics

Keyword：Rol baja kecepatan tinggi, Hss roll material, Hss rolls characteristics

The material of high-speed steel rolls should have the characteristics of high hardness, high wear resistance, high heat resistance, good thermal conductivity and uniform hardness and structure. Under normal rolling conditions, the service life of high-speed steel rolls is more than three times that of alloy cast iron rolls. During the manufacturing process, appropriate materials and manufacturing processes should be selected based on specific product requirements and process conditions to ensure the performance and quality of the rolls.

The material of Rol HSS should have the following characteristics:

1. High hardness: High-speed steel rolls need to have high hardness to ensure accurate control of metal deformation and processing accuracy during the rolling process. Generally, the hardness of the roll is required to be in the range of HRC (Rockwell hardness) 60 to 65.

2. High wear resistance: Since high-speed steel rolls need to be used for a long time, they need to have high wear resistance to resist metal friction and wear. Wear resistance can be improved by adding materials such as cemented carbide and carbide.

3. High heat resistance: During the rolling process, the roll will be affected by high temperature and high-speed friction, so it needs to have high heat resistance to maintain its hardness and wear resistance. Heat resistance can be improved by selecting heat-resistant alloys and adding heat-resistant elements.

4. Good thermal conductivity: The roll needs to have good thermal conductivity to transfer heat to the metal to ensure the stability of the rolling process and the quality of metal processing.

5. Uniform hardness and structure: High-speed steel rolls need to have uniform hardness and structure to avoid local deformation and stress concentration during the rolling process and ensure rolling accuracy and product quality.

To sum up, the material of high-speed steel rolls should have the characteristics of high hardness, high wear resistance, high heat resistance, good thermal conductivity and uniform hardness and structure. Under normal rolling conditions, the service life of high-speed steel rolls is more than three times that of alloy cast iron rolls. During the manufacturing process, appropriate materials and manufacturing processes should be selected based on specific product requirements and process conditions to ensure the performance and quality of the rolls.

Characteristics of rol baja kecepatan tinggi:

1. High-speed steel rolls have high carbon content and high alloying elements such as vanadium, chromium, tungsten, molybdenum, and niobium. Therefore, the types of carbides in the roll structure are mainly MC type and M2C type, and the carbide hardness High and good wear resistance.

2. High-speed steel rolls have good thermal stability. At the rolling temperature, the roll surface has high hardness and good wear resistance.

3. High-speed steel rolls have good hardenability, and the hardness almost does not drop from the surface of the roll body to the inside of the working layer, thus ensuring that the rolls have equally good wear resistance from the outside to the inside.

4. During the use of the roll, under good cooling conditions, a thin and dense oxide film is formed on the surface of the roll body. This uniform, thin and dense oxide film exists for a long time without falling off, which improves the wear resistance of the high-speed steel roll. Significantly increased. ​

5. The formation of oxide film on the roll surface of high-speed steel rolls during rolling reduces the friction between the rolling material and the roll surface. Therefore, it is easy to cause slipping during the rolling process, making the adjustment of the rolling mill more difficult. ​

6. The high-speed steel material has a large expansion coefficient and good thermal conductivity, which can easily cause roll shape changes during rolling and affect the accuracy of the rolled material. Therefore, when high-speed steel rolls are used in plate and strip mills, not only the design of the cooling system must be changed, but also the design of the roll shape must be changed. ​

7. Since the core of the high-speed steel roll is made of alloy ductile iron, graphite steel or forged steel, the roll neck has high strength. ​

Since high-speed steel materials have good wear resistance and poor accident resistance, the use effect of high-speed steel rolls not only depends on the quality of the high-speed steel rolls themselves, but more importantly, depends on the use conditions and maintenance of the rolls.