Alloy ultrasonic-spraying strengthening method for roll pass surface of finishing roll of section steel and spraying material

Abstract

The invention discloses an alloy ultrasonic-spraying strengthening method for a roll pass surface of a finishing roll of section steel and a spraying material, and belongs to the technical field of material surface strengthening. Nano-scaled carbide alloy powder is selected and used in the method and includes 15-20% of nickel-aluminum powder, 50-70% of cobalt-tungsten carbide alloy powder, 10-20% of chrome-molybdenum-manganese composite powder and 5-15% of boron-tungsten composite powder. The method comprises the following steps: firstly, priming on the finishing roll of the section steel with the nickel-aluminum powder by 0.02 mm; secondly, fusing the cobalt-tungsten carbide alloy powder, the chrome-molybdenum-manganese composite powder and the boron-tungsten composite powder, and uniformly spraying a fused material to the surface of the roll, wherein the thickness of a spraying layer is 0.15-0.20 mm, a distance between a spray gun and a sprayed surface is 160-180 mm, and an included angle between the spray gun and the sprayed surface is not more than 90 degrees. The method adopts an alloy ultrasonic-spraying strengthening mode, so that the high-temperature resistance and the wear resistance of the roll pass surface are improved, the online time of the roll is prolonged, the total amount of steel is increased by more than one time, and the service life of the roll is prolonged by more than two times.

Description

Technical field [0001] The invention belongs to the technical field of material surface strengthening, and in particular relates to a supersonic spraying strengthening method for the surface alloy of a section steel finishing roll pass, and also relates to a spraying material. Background technique [0002] Roll is an important part of the rolling mill and one of the main spare parts consumed in rolling production. It plays a key role in the quality of section steel. The working conditions of the rolls are very bad, and because of the different linear speeds in the radial direction of the roll pass, relative sliding occurs between the section steel and the roll, and the phenomenon of steel rolling occurs, which increases the wear of the roll. In addition, stress is prone to appear at the transition arc of the finished roll pass. Concentrated, the rolls are locally damaged, the section steel will have surface scratches, buildups, and edge thickness differences during the rolling pr...

AI Technical Summary

Problems solved by technology

The existing problems are: 1) EDM equipment has a large investment and high maintenance costs; 2) The precision of the equipment is high and the thickness of the alloy layer is different, the wear resistance of the alloy layer is poor, the effect is not ideal, and it cannot be used in the hole At the transition arc of the profile, the stress at the arc cannot be eliminated, and the wear of the roll pass is accelerated, and the service life is short

The existing problems are: 1) The required large-scale laser equipment requires a large investment and high maintenance costs; the roll pretreatment requirements are relatively strict, the operation process is cumbersome, and the labor intensity is high; 2) The light-absorbing material has poor wear resistance, short service life, and It cannot be used at the transition arc of the pass pattern, so the stress at the arc cannot be relieved

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