Hot rolling roller for rolling nonferrous metal, and manufacturing method thereof

Abstract

The present invention discloses a hot rolling roller for rolling a nonferrous metal, and a manufacturing method thereof. Chemical components of the roller comprise, by weight, 0.50-0.80% of C, 0.30-1.20% of Si, 0.20-1.00% of Mn, less than or equal to 0.025% of P, less than or equal to 0.020% of S, 4.50-6.00% of Cr, 0.20-0.80% of Ni, 0.20-1.00% of Mo, 0.10-0.50% of V, and the balance of Fe and unavoidable impurities. The manufacturing method of the roller comprises the following process steps: a, refining a steel ingot; b, forging a roller blank; c, carrying out quenching and tempering, and carrying out mechanical processing; d, carrying out a quenching heat treatment; and e, carrying out a tempering treatment. The hot rolling roller has characteristics of high wear resistance, good thermal cracking resistance and good electrochemical corrosion resistance, and a service life of the hot rolling roller can be increased by more than 50% compared with the ordinary Cr3 roller.

Description

technical field [0001] The invention relates to a roll and a manufacturing method thereof, in particular to a hot rolling roll for rolling nonferrous metals and a manufacturing method thereof. Background technique [0002] The roll is an important part of the rolling mill in the rolling mill and an important consumable part that determines the efficiency of the rolling mill and the quality of the rolled product. The rolls use the pressure generated by a pair or a group of rolls to roll the rolled piece, so that the rolled piece produces plastic deformation and obtains an ideal design shape. Therefore, the quality of the roll is directly related to the surface quality of the rolled product and the rolled steel. machine productivity. It is mainly subjected to dynamic and static loads, wear and temperature changes during rolling. [0003] According to different working conditions, rolls are usually divided into cold rolls and hot rolls. Among them, hot rolling rolls are usua...

AI Technical Summary

Problems solved by technology

At present, the main material of domestic hot rolls used for rolling non-ferrous metals is Cr3 series materials. However, hot rolls of this type of material can no longer meet market demand and high-quality product surface requirements. The reasons include the following:

[0005] (1) The rolls made of Cr3 series materials have poor wear resistance and short roll changing cycle; according to statistics, such non-ferrous metal hot rolls may fail after continuous rolling of about 600 tons of metal rods. The production efficiency of the rolling equipment increases the labor intensity of the workers, and makes the production cost of the product remain high; at the same time, due to the wear of the roll, the ability to maintain the roll shape is poor, and the dimensional accuracy and shape of the rolled plate are difficult to guarantee. , product quality declines;

[0006] (2) During the rolling process, since the roll is a steel material, the electrode potential of the non-ferrous metal material is different, so the processing system composed of the roll, non-ferrous metal and rolling lubricant becomes a chemical primary battery system. During the manufacturing process, the rolls are simultaneously subjected to electrochemical corrosion under rolling stress conditions and stress fatigue under corrosive conditions. Thermal cracks are prone to appear on the surface of the roll body, and the grinding amount of the off-machine is large, which further aggravates the wear of the rolls and shortens the length of the rolls. life;

[0007] (3) After thermal cracks appear on the surface of the roll, it is easy to be printed on the non-ferrous metal sheet during rolling, resulting in poor quality of the rolled metal sheet surface, and even a large amount of waste products