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Graphite steel rolls are composed mainly of pearlite with spherical graphite and some carbide. Graphite steel rolls are stronger than cast iron rolls and harder than other steel rolls. The feature of graphite rolls that is better resistance to fire crack and scale adhesion.
Enhanced ICDP roll are developed based on ICDP rolls. The microstructure consists of a bainitic / martensitic matrix with Fe3C and MC carbides homogeneously distributed and a certain amount of free graphite fine and also well distributed in the matrix.The rolls are double tempered to avoid retained Austenite and to obtain the right hardness level and the optimum residual stress level.
The carbon content of alloy cast steel rolls is lower than other cast rolls, included adamite rolls, HCr steel rolls and graphite steel rolls, so it exhibit excellent toughness. The alloy cast steel rolls are made by high quality melted steel with arc furnace and refiner with advanced casting and heat treatment procedure, the rolls also have good wear resistance, and fire crack resistance.
Enhanced High Chromium Iron Roll is widely used in early finishing stands of hot strip mills, skin pass stands and in finishing stands of small section mills. The high Cr content of the shell material and the absence of free graphite characterize these grades. Different types of carbides with high hardness and a tempered martensitic microstructure guarantee an excellent wear resistance. All high chromium rolls are high temperature heat treated and tempered to obtain optimal properties, Enhanced HiCr rolls are alloyed additionally with W, V and Nb to increase the hardness of eutectic carbides, hence increasing the performance of the rolls significantly, so they will get better performance on these stands.
High chromium steel Roll is similar to high Cr cast iron roll with lower carbon content of 1.0-1.8%.The lower carbon grades are true steel with no eutectic carbides and higher carbon grades have some eutectic carbides.Hi Chromium steel rolls are used in roughing stands of HSMs, Steckle Mills and some early finishing stands of Hot Strip Mills.Enhanced High Chromium Steel Rolls are alloyed with Nb, V and W to improve the wear resistance performance.
HSS Rolls,high speed steel rolls are manufactured with vertical centrifugal casting process, the core material is nodular for excellent toughness, the shell material is HSS with high hardness and excellent wear resistance at high temperature.The shell manufactured with high alloy content and special heat treatment process, the microstructure is martensite and bainite with plenty of carbides such as MC, M2C and M6C distributed amog the matrix. There is almost no hardness drop in the shell until the temperature exceeds 550°C. The wear resistance is about 3-5 times of AIC rolls and HCr iron rolls.
The composition and subsequent heat treatment ensure the hardness of the working layer will reach to 80/85 hsc with uniform hardness throughout the working layer.
Recommended Applications
-Work rolls for finishing stands of hot strip mills.
-Rolls for universal section mills.
-Rolls for Intermediate stands, prefinishing stands, finishing stands of bar mills.
-Rolls and rings for prefinishing stands and finishing stands of high speed wire rod mills.
-Rings for KOCKS mills.
-Rings for seamless steel pipe mills.