Surface Alloy Supersonic Spraying Strengthening Method and Spraying Material of Finished Steel Roll Pass

Abstract

The invention discloses a surface alloy supersonic spraying strengthening method and a spraying material of a profile steel finish roll pass, belonging to the technical field of material surface strengthening. The method selects nano-scale carbide alloy powder, of which: 15-20% of nickel-aluminum powder, 50-70% of cobalt-tungsten carbide alloy powder, 10-20% of chromium-molybdenum-manganese composite powder, and 5-15% of boron-tungsten composite powder. Use nickel-aluminum powder to make a base of 0.02mm on the profile steel finish roll, and then melt cobalt-tungsten carbide powder, chromium-molybdenum-manganese composite powder and boron-tungsten composite powder and spray evenly on the surface of the roll. The thickness of the sprayed layer is 0.15-0.20mm. The distance between the spray gun and the sprayed surface is 160-180mm, and the angle between the spray gun and the sprayed surface is ≤90°. The method adopts alloy supersonic spraying to strengthen, the surface of the roll pass can resist high temperature and wear resistance, the online time of the roll is prolonged, the amount of passing steel is increased by more than 1 times, and the life of the roll is extended by more than 2 times.

Description

technical field [0001] The invention belongs to the technical field of material surface strengthening, and in particular relates to a method for supersonic spraying and strengthening of surface alloys on the pass surface of section steel finishing rolls, and also relates to a spraying material. Background technique [0002] The roll is an important part of the rolling mill and one of the main consumable spare parts in the rolling production, which plays a key role in the quality of the section steel. The working conditions of the rolls are very harsh, and due to the different linear speeds in the radial direction of the roll pass, relative sliding occurs between the profiled steel and the rolls, and steel rubbing occurs, which aggravates the wear of the rolls, and the transition arc of the finished roll pass is prone to stress Concentration, local damage to the rolls, surface scratches, buildup, and edge thickness differences in the section steel during the rolling productio...

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