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An improved roller cooling and roll gap lubrication device, belonging to the field of rolling mill technology, is designed to address the existing defects of uneven lubricating oil film and the tendency to mix with residual cooling water in existing devices. The device comprises upper and lower water-cutting plates located at the entrance of the roll gap, cooling headers arranged above and below the upper and lower water-cutting plates, and lubrication headers arranged at the locations of the upper and lower water-cutting plates. The improvement lies in arranging the lubrication headers above the upper water-cutting plate and below the lower water-cutting plate. This utility model enables the uneven lubricating oil sprayed onto the roller surface by the lubrication headers to be smoothed out by the upper and lower water-cutting plates, thus forming a uniform oil film. It allows the lubrication headers to be kept away from the high-temperature rolled pieces between the roll gaps, eliminating the scaling and blockage of the oil spray nozzles caused by high-temperature baking. It significantly improves the lubrication effect of the roll gap, thereby enhancing the surface quality of the rolled pieces, especially plates and strips, and extending the service life of the rollers. It is suitable for installation and use in rolling mills, especially in finishing mills for hot rolling of plates and strips.

A process and method for laser nano-ceramic alloying of the surface of a metallurgical hot rolling roller, characterized in that it comprises the following process steps: machining the roller to remove the surface fatigue layer, obtaining the desired size and shape, then grinding the side to be irradiated by laser, removing oil stains and performing appropriate cleaning; mixing nano-carbide ceramic coating uniformly with phenolic resin binder, then evenly coating the pre-treated roller surface with a pre-coating thickness of 0.01-0.05mm, followed by air drying; selecting high-power CO2.

Improved nickel-chromium-molybdenum indefinitely chill cast iron for rollers and composite rollers are related to the improvement of the material for metal processing hot rolling and cold rolling strip rollers - nickel-chromium-molybdenum indefinitely chill cast iron. Specifically, it relates to a type of nickel-chromium-molybdenum indefinitely chill cast iron for rollers with good wear resistance and thermal crack resistance, as well as long service life. Its characteristic is the addition of 0.03-0.1% boron and 0.2-1.5% niobium to the composition of the nickel-chromium-molybdenum indefinitely chill cast iron. Additionally, it also relates to composite rollers made from this material. The addition of boron and niobium significantly improves the wear resistance and thermal crack resistance of the material, overcoming the deficiencies of the raw material. The composite rollers made from this material for the working layer have a significantly longer service life than the original ones, which can increase the rolling output of the strip by more than 20%. The improvement in thermal crack resistance significantly reduces the number of downtime for roller replacement and repair, not only reducing the labor intensity of operation but also improving the operation rate of the rolling mill and increasing the rolling output per shift.