High-speed steel roll is a high-carbon high-speed steel composite roll, which has become an important part of the development of modern rolling production. After 20 years of development, it has been widely used in rolling mills all over the world. At present, cast high-speed steel rolls are not only widely used in the finishing stands of cold and hot strip steel hot rolling mills, but also in the finishing stands of wire and bar mills. Is a very good application, then, let's take a look at the advantages of high speed steel roll.

The advantages of high speed steel roll:

1. High hardness of carbide: The rollers used in the past mostly distribute Fe3C or M7C3 cocrystalline carbide on the substrate, with coarse organization and low hardness. High-speed steel rolls generally use high-C, high-V high-speed steel, but also contain more Cr, Mo, W, Nb, Co and other alloying elements. During solidification and heat treatment, these alloying elements form primary and secondary carbides. Things. High chromium cast iron roll carbide M7C3(2500Hv) and M23C6(1600Hv). In the infinite chilled cast iron roll, the carbide is Fe3C(l300Hv).

2, good thermal stability: high speed steel roll contains more W, Cr, Mo, V, Nb and other elements, good thermal stability. It is found that the hardness of ordinary roll material decreases obviously with the increase of temperature, while the high-speed steel roll still maintains 500Hv when it is 600, which will greatly improve the wear resistance of the roll. In particular, this tendency is more obvious when the Co element distributed in the matrix is added.

3. It is easy to form an oxide film during use. In the rolling process, if a continuous, dense, uniform and well-bonded oxide film is formed on the surface of the roll, it can not only reduce the friction coefficient between the roll and the rolled material, but also improve the dimensional accuracy and the surface quality of the rolled material. In the early stage of use, the ordinary roll is worn due to the lack of oxide film protection. High-speed steel rolls will quickly form oxide films during use. The appearance of the oxide film can reduce the friction between the strip steel and the roll surface, prevent the roll from sticking to the steel, and improve the life of the roll. Compared with ordinary rolls, the initial wear of high-speed steel rolls is lower, which is beneficial to improve the wear resistance of high-speed steel rolls.

4. Good hardenability: high speed steel roll has good hardenability. At room temperature, within 50mm of the working layer, the hardness drop from the roller surface to the core is less than 3HS, which can ensure that the roller has good wear resistance from outside to inside.

5. Good toughness: Compared with general infinite chilled cast iron, high chromium cast iron and semi-steel rolls, high-speed steel rolls have high basic mechanical properties, tensile strength and fracture toughness. Rouse comes in.

Good thermal cracking resistance: Due to its unique structural characteristics, high-speed steel can effectively inhibit the formation and expansion of cracks. In actual use, it is found that the thermal cracking resistance of high-speed steel rolls is indeed better than that of high-chromium cast iron rolls. Therefore, if a general production accident occurs, the impact of the accident can be eliminated by normal grinding volume or a small amount of additional grinding volume, which simplifies the processing process and saves costs.

7. Good wear resistance: Compared with semi-steel, high-chromium cast iron and high-nickel-chromium infinite chilled cast iron rolls, the rolling tonnage of high-speed steel rolls is greatly improved. The F1-F4 frame is about 10000t and the F5 frame is about 6000t, which shows that the high-speed steel roll has good wear resistance. The increase of high-speed steel roll rolling tonnage leads to a significant decrease in roll consumption. Under the same rolling conditions, the roll consumption of high-speed steel rolls is 1/5 of that of F1 stand high-chromium cast iron rolls and F2 stand high-chromium cast iron rolls. F4 stand is 1/13 of high nickel chromium infinite chilled cast iron roll, F5 stand is 1/8 of high nickel chromium infinite chilled cast iron roll.

The above is the advantages of high speed steel roll. Want to know more, welcome to contact us!