Roller and preparation method of roller

Abstract

The invention provides a roller and a preparation method of the roller. The preparation method of the roller comprises the following steps of: firstly, smelting molten iron with qualified ingredientsof the outer layer of the roller, then heating to 1500 to 1550 DEG C, keeping the temperature for 30 minutes; pre-adding a silicon-zirconium alloy and a rare earth ferrosilicon alloy at the bottom ofa ladle; when the temperature of the molten iron drops to 1390 to 1420 DEG C, discharging the molten iron from a furnace into the ladle, and slagging off after discharging from the furnace; when the temperature of the molten iron drops to 1350 plus / minus 5 DEG C, adding a ferrosilicon alloy to the molten iron, and stirring until fully melting; preparing a funnel in advance at a pouring position, and preloading ferrosilicon particles in the funnel; and when the temperature of the molten iron drops to 1330 plus / minus 5 DEG C, transferring the ladle o the pouring position for pouring, and meanwhile uniformly introducing the ferrosilicon particles into a cavity along with the poured molten iron. The preparation method of the roller can improve the uniformity of an outer layer structure of theroller, and enables a working layer of the roller to better maintain the consistency of the structures in different thickness ranges. The roller has small hardness drop, high wear resistance and strong holding capacity of roller surface precision.

Description

technical field [0001] The invention relates to the technical field of roll preparation, in particular to a roll preparation method. Simultaneously, the invention also relates to a roll manufactured by using the roll preparation method. Background technique [0002] The roll is the main working part and tool for continuous plastic deformation of the processed metal on the rolling mill. In the existing roll preparation method, when preparing the outer layer of the roll, high-nickel-chromium molten iron is used, and ferrosilicon particles are used to inoculate the molten iron once or twice when it comes out of the furnace, and the molten iron is added by adding 0.2%- Precious alloys such as 1.0% V, 0.2%-1.5% Nb or 0.2%-1.0% W can improve the structure of the outer layer of the roll, that is, the working layer. [0003] The existing roll preparation method has the following problems: [0004] 1. A large amount of precious alloy is used, the production cost is high, and the r...

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Problems solved by technology

[0004] 1. Using a large amount of precious alloys, the production cost is high and the resource consumption is large

[0005] 2. Due to the large difference in specific gravity, different alloys are prone to segregation in the working layer, which affects product quality

[0006] 3. The inoculation method and inoculant are greatly affected by the inoculation temperature and time, the inoculation effect is different, and the product quality consistency is poor

[0007] 4. When the working layer with high nickel and chromium is solidified, it is affected by the chilling effect of the mold. The structure of the working layer at different depths is quite different, and the hardness drop is large.

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