High-speed steel roll is a hot-rolled material with rapid development and wide application in recent years. Its composition is more complex alloy steel. Can harden. The working layer is made of high carbon steel, and the roller core is made of ductile iron, graphite steel or forged steel. The two different materials are compounded by centrifugal casting or CPC process. The matrix structure is generally tempered martensite bainite carbide, and the carbide is distributed in the matrix in a highly dispersed form, so it has high wear resistance and toughness, which makes turning difficult. So, let's take a look at the characteristics and use of high-speed steel rolls.

High speed steel roll features:

Good thermal stability, good hardenability, high carbide hardness, easy to form oxide film, thermal cracking resistance and good wear resistance, the requirements for cooling water is far lower than that of cemented carbide. Requirements, its single groove rolling capacity can reach 45 times the cast iron roll. It is beneficial to the negative tolerance control of the rolled material and improve the surface quality of the rolled material. It is mainly aimed at the application of online bar products and finished front frames, as well as the development of new material coils for slitting and rolling pre-cutting and slitting passes. The hardness can reach HSD78-90, high wear resistance, good impact resistance and good thermal fatigue resistance. With the popularity of high-speed steel roll online bar mill, R & D manufacturers quickly spread out. However, the alloy elements added by various manufacturers in the casting process of high-speed steel rolls are not the same. Therefore, in terms of processing and use, cutting is difficult. The degree and effect of online use are not exactly the same, generally containing tungsten, molybdenum, chromium, vanadium, niobium and other carbide forming elements.

high speed steel roll use process:

During the use of high-speed steel rolls, the cooling of the roll body requires the use of clean low-temperature water to ensure water pressure and water volume. In this way, the roller body is thermally cracked due to overheating, and the expansion of the thermal crack leads to the peeling of the roller body, while reducing the structural phase change of the roller body caused by the excessive temperature of the roller body. The ideal cooling system should have multiple nozzles arranged in a ring around the groove to ensure continuous and sufficient water flow to the rolling groove. Generally, the water temperature is not more than 40, the water pressure is controlled to 0.4 MPa0.6MPa, and the water volume of a single cylinder is not less than 300L/min500L/min, ensuring that 70% and 80% of the water volume is on the outlet side. The water flow should be aligned with the roller groove to avoid scattering. In addition, high speed steel rolls are highly sensitive to hot cracking. Before the roll comes into contact with red steel, it is necessary to open the cooling water in advance to cool the rolling groove.

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