Wearable hot roll

Abstract

The invention discloses a wearable hot roll which comprises a hot roll body, wherein a water cooling layer is arranged on the internal wall of the body; and a tungsten carbide hard alloy layer coated with a nanometer ceramic coating outside is coated on the external wall of the body. According to the wearable hot roll, the tungsten carbide hard alloy layer is coated on the surface of the body, and the nanometer ceramic coating is coated outside the tungsten carbide hard alloy layer, so the wearable hot roll has the effect of heat insulating, has no falling and no burning, is waterproof and moisture-proof, and is good in effect of lubricating; the mechanical performance and the chemical performance of the hot roll are greatly improved; and meanwhile, good effect of cooling can be achieved via the water cooling layer, therefore, the longer service life can be ensured.

Description

technical field [0001] The invention relates to the field of hot rolls, in particular to a wear-resistant hot roll. Background technique [0002] The hot roll is an important part of the rolling mill, which uses the pressure generated by a pair or a set of rolls to roll the steel. However, the following problems often occur in existing hot rolls: 1. Cracks on the roll surface: cracks are divided into normal cracks and abnormal cracks. Normal cracks are also called thermal cracks, which are caused by thermal stress caused by multiple temperature cycles. Gradual cracking is a micro-surface layer phenomenon that occurs on the roll surface; abnormal cracks are thermal shock cracks caused by accidents such as slipping, sticking steel, jamming steel, stacking steel, and tailing during the rolling process. Cracks with a certain depth and elongation are formed locally on the surface; 2. Indentation: mainly refers to the indentation of foreign matter such as iron oxide scale due to ...

AI Technical Summary

Problems solved by technology

However, the following problems often occur in existing hot rolls: 1. Cracks on the roll surface: cracks are divided into normal cracks and abnormal cracks. Normal cracks are also called thermal cracks, which are caused by thermal stress caused by multiple temperature cycles. Gradual cracking is a micro-surface layer phenomenon that occurs on the roll surface; abnormal cracks are thermal shock cracks caused by accidents such as slipping, sticking steel, jamming steel, stacking steel, and tailing during the rolling process. Cracks with a certain depth and elongation are formed locally on the surface; 2. Indentation: mainly refers to the indentation of foreign matter such as iron oxide scale due to cleaning reasons during the production process, resulting in continuous or discontinuous distribution of irregular shapes on the roller surface pits, etc.; 3. Oxidation film shedding: at the beginning of rolling, after a period of hot rolling, a layer of silver-gray or light blue thinner oxide film is formed on the surface of the roll, which protects the surface of the roll and improves the surface quality of the rolled piece. Very important, due to the repeated action of the rolling force, the oxide film will produce microcracks along the carbide; when the cooling capacity of the roll is insufficient, it is difficult to form a dense oxide film on the roll surface, and even if the oxide film is formed, it will deteriorate quickly

If the rolling is unreasonable, the oxide film will be destroyed rapidly during the formation process, which will cause the oxide film to fall off, leaving defects such as meteor spots on the roll surface, resulting in an increase in the roughness of the roll surface and increased wear; 4. Sticking steel, Abnormal wear, etc.: due to abnormal rolling, the roll surface and the rolled piece are stuck together, and steel sticking occurs; the unreasonable process parameters during rolling cause excessive consumption of the same-width-kilometer roll, resulting in uneven wear of the roll surface

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