High-Speed Steel Rolling Mill Roll Features, the characteristics of high-speed steel rolling mill rolls are mainly reflected in the following seven aspects:

1) Carburide hardness is high. The previous rolling mill rolls commonly used Fe3C or M7C3 eutectic carbides on their matrix, with coarse structure and lower hardness. High-speed steel rolling mill rolls generally employ high-C, high-V high-speed steel, and also contain a significant amount of alloy elements such as Cr, Mo, W, Nb, and Co. During the solidification and heat treatment process, these alloy elements form primary and secondary carbides. The carbides in high-chromium cast iron rolling mill rolls are M7C3 (2500 Hv) and M23C6 (1600 Hv). In the case of infinitely cold-hardened cast iron rolling mill rolls, the carbides are Fe3C (1300 Hv). The high-speed steel rolling mill rolls are primarily composed of MC (3000 Hv), M7C3 (2500 Hv), and M6C (2000 Hv), which can replace general rolling mill rolls to enhance wear resistance. Additionally, with an increase in V content, the skeletal M6C carbides in the high-speed steel structure transform into granular VC carbides.

2) Excellent thermal stability. High-speed steel rolling rolls contain a higher proportion of elements such as W, Cr, Mo, V, and Nb, which offer good thermal stability. Research has found that the hardness of ordinary rolling roll materials decreases significantly with increasing temperature, whereas high-speed steel rolling rolls maintain a hardness of 500 Hv at 600°C, which will undoubtedly greatly enhance the wear resistance of the rolls. Particularly when cobalt (Co) elements are added to the matrix structure, this trend becomes even more pronounced.

3) The use of medium can easily form an oxide film. During the rolling process, if a continuous, dense, uniform, and adhesive oxide film forms on the roller surface, it can not only reduce the friction coefficient between the roller and the rolled material but also improve the dimensional accuracy and surface quality of the rolled material. Initially, due to the lack of an oxide film for protection, the wear on conventional rollers is significant. High-speed steel rollers can quickly form an oxide film during use, and the presence of the oxide film can reduce friction between the strip and the roller surface, prevent sticking of the roller, and extend the roller's lifespan. Compared to conventional rollers, high-speed steel rollers have lower initial wear, which is highly beneficial for improving the wear resistance of high-speed steel rollers.

4) Excellent Quenching Penetration. High-speed steel rolling rolls feature excellent quenching penetration, ensuring that within a 50mm working layer at room temperature, the hardness decrease from the roll surface to the core is less than 3HS. This guarantees superior wear resistance throughout the entire roll from the outside to the inside.

5) Excellent toughness. The high-speed steel rolling mill rolls exhibit superior basic mechanical properties, including tensile strength and fracture toughness, when compared to general chilled iron, high-chromium cast iron, and semi-steel rolling rolls. Their values are superior to those of high-chromium cast iron and chilled iron rolling rolls, and are comparable to those of semi-steel rolling rolls.

6) Excellent resistance to thermal cracking. High-speed steel, due to its unique organizational characteristics, effectively inhibits the formation and expansion of cracks. In actual use, it has been found that high-speed steel rolls indeed possess better resistance to thermal cracking than high-chromium cast iron rolls. Therefore, in the event of general production accidents, the impact of the accident can be eliminated through normal grinding quantities or by adding a very small amount of grinding, simplifying the process and also saving costs.

7) Excellent wear resistance. Compared to semi-steel, high-chromium cast iron, and high-nickel-chromium infinite cold-hard cast iron rolls, high-speed steel rolls significantly increase tonnage, reaching about 10,000t for F1-F4 stands and approximately 6,000t for F5 stands, demonstrating the superior wear resistance of high-speed steel rolls. The increased tonnage of high-speed steel rolls leads to a marked reduction in roll consumption. Under the same rolling conditions, the roll consumption of high-speed steel rolls is 1/5 that of high-chromium cast iron rolls on the F1 stand, 1/7 on the F2 stand, 1/13 on the F4 stand, and 1/8 on the F5 stand compared to high-nickel-chromium infinite cold-hard cast iron rolls.

High-speed steel rolling mill manufacturing technology primarily involves techniques such as forging, casting, spray forming, and hot isostatic pressing. The promotion and use of forged high-speed steel rolling mills has progressed slowly; currently, the more common methods for manufacturing high-speed steel rolling mills in industrial production include centrifugal casting, continuous pouring outer layer forming, electroslag remelting, and liquid metal electroslag welding.