Improved composite high chromium steel roller and preparation process thereof
A high-chromium steel and roll technology, which is applied in the field of composite high-chromium steel rolls and the preparation of excellent metallurgical bonding, can solve the problems of reduced surface quality of rolled strips, reduced overall wear resistance of rolls, poor fatigue strength performance, etc. , to achieve the effect of reducing the amount of single grinding, prolonging the service life and high fatigue resistance
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Embodiment 1
[0014] Example 1: According to the composition of the high chromium steel working layer, the proportioned scrap steel and high chromium steel are returned to be smelted in an intermediate frequency furnace. After the melting, the chemical composition of the raw molten steel is analyzed, and then the corresponding alloy material is mixed to obtain the composition (Wt%): C1.63%, Si0.65%, Mn0.60%, Ni0.75%, Cr11%, Mo2.5%, V0.35%, N0.12%, B0.002%, Al0 .15%, P0.02%, S0.013%, the rest is molten steel in the working layer of iron and impurities. Vertical centrifugal casting composite roll, the working layer is poured when the molten steel of the working layer is 1455℃, when the interface temperature is 1270℃, when the temperature of the ductile iron is 1285℃, the 50mm ductile iron middle layer is poured. After the middle layer is partially solidified, The ductile iron core layer is poured at a temperature of 1304°C to obtain a composite roll. The hardness of the working layer of the roll ...
Embodiment 2
[0015] Embodiment 2: As in embodiment 1, the composition of the working layer of the roll is (Wt%): C1.68%, Si0.7%, Mn0.65%, Ni0.83%, Cr11.5%, Mo2.6%, V0 .4%, N0.14%, B0.0028%, Al0.17%, P0.0025%, S0.013%, the rest is molten steel in the working layer of iron and impurities. Vertical centrifugal casting composite roll, the working layer is poured when the molten steel of the working layer is 1450℃, when the interface temperature is 1268℃, when the temperature of the ductile iron is 1290℃, the 50mm ductile iron middle layer is poured. After the middle layer is partially solidified, When the temperature is 1310°C, the nodular iron core layer is poured to obtain a composite roll. The hardness of the working layer of the roll obtained by the heat treatment is 82HSD, and the hardness drop is less than 3HSD. After the rolling test, the overall service life of the roll is more than doubled.
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