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The basic characteristics and process of centrifugal roll

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The basic characteristics and process of centrifugal roll

  • Time of issue:2022-09-22 15:35

The basic characteristics and process of centrifugal roll

  • Time of issue:2022-09-22 15:35
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   The basic characteristics of centrifugal rolls are:

  Carbide has high hardness; good thermal stability; excellent strength and toughness; good hardenability; strong ability to form oxide film; good thermal cracking resistance; good wear resistance. The main features of the centrifugal roll composition are: high carbon content and vanadium content to obtain more high-hardness MC carbides and improve the wear resistance of the roll. High chromium content and a certain amount of M7C3 carbide in the roll can improve the roughness of the roll surface and reduce the rolling force.  

  In addition, the niobium content of the centrifugal roll is less than 5%, which is beneficial to reduce the segregation caused by the large difference in the density of alloying elements and carbides in high-speed steel.  

  The manufacturing process of the centrifugal roll is as follows:

  Forged HSS Rolls, Cast HSS Rolls, Spray Deposition Modeling (Osprey) HSS Rolls and Hot Isostatic Pressed (HIP) HSS Rolls. Among them, centrifugal casting (CF), continuous casting (CPC), electroslag remelting (ESR) and liquid metal electroslag welding (ESLLM) can be used to cast high-speed steel rolls.  

  The research progress of centrifugal roll heat treatment includes the following aspects:

  The impact of quenching on the microstructure and properties of high-speed steel rolls to accurately formulate the heat treatment process for high-speed steel rolls. The analysis of the continuous cooling curve after austenitizing at 1050°C shows that the bainite temperature of the high-speed steel roll is lower than 400°C, and the bainite cooling rate is lower than 10°C/s. When the cooling rate of the high-speed steel roll exceeds 10°C/s, a quenched martensite matrix with high hardness can be obtained. Austenitizing holding time has certain influence on the microstructure and properties of high-speed steel rolls. Quenching time affects the microstructure of high-speed steel rolls. After austenitizing for 2 hours, the carbides in the high-speed steel roll structure are mainly M7C3, and after holding for 4 hours, the carbides are mainly M7C3. After 6 hours of heat preservation, the carbides are mainly MC type.  

  Austenitizing holding time also affects the wear resistance of centrifugal rolls . When the austenitizing holding time is 2h, the high-speed steel has poor wear resistance and severe carbide peeling. When the holding time is extended to 4h, the high-speed steel roll wears evenly, and only a small amount of coarse M2C carbides peel off. When the holding time is extended to 6h, M7C3 carbides disappear, high hardness MC carbides increase, and things fall without carbonization. High-speed steel rolls have better wear resistance.  

  Reasonable control of tempering temperature In actual use, the tempering hardness of high-speed steel rolls is not very good. Effect of tempering temperature on hardness, wear resistance and surface roughness of high-speed steel rolls containing 2.0%C, 5.0%V, 3.0%Mo, 1.5%W, 6.5%Cr and 1.0%Ni. After tempering at 50°C, the hardness reaches a high value, and after tempering at 540°C, the hardness gradually decreases. In addition, when tempered at 540°C, the high-speed steel rolls wear less and have better wear resistance. As the tempering temperature increases, the grinding loss increases and the wear resistance decreases.

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