Hard surfacing sintered flux and manufacturing method thereof

Abstract

The invention relates to a hard surfacing sintered flux and a manufacturing method thereof. The sintered flux comprises MgO of 30 percent to 50 precent, CaO of 2 percent to 10 percent, Al2O3 of 10 percent to 20 percent, CaF2 of 18 percent to 28 percent, SiO2 of 10 percent to 20 percent, SiC of 0 percent to 1.5 percent and other components of 0 percent to 5 percent such as ferroalloy mainly playing a role of desoxidation and the like. Material preparation, dry mixing and wet mixing by adding soluble glass into a blender are conducted until granules which have the required sizes are formed, then the granules are dried in a rotary drying way at the low temperature of 200 DEG C to 250 DEG C, and then finished products are obtained by high-temperature sintering in a rotary drying oven at the high temperature of 700 DEG C to 750 DEG C, sieving and packaging. The invention has low flux cost so as to meet the requirements of different hardness, excellent technique and good high-temperature slag detachability; the deposited metal has no gas hole, no crackle but adjustable hardness; and the high-temperature wear-resistance, oxide etch resistance and cold and thermal fatigue resistance of a hot roll are greatly improved.

Description

technical field [0001] The invention relates to a technology in the field of welding materials, more specifically to the technology of automatic submerged-arc surfacing welding sintering flux for hard-facing surfacing welding of metallurgical hot rolls, in particular to a sintering flux for hard-facing surfacing welding and a manufacturing method thereof. Background technique [0002] Hardfacing surfacing is a branch of surface engineering. It is suitable for the repair and manufacture of wear-resistant parts in metallurgy, mining, machinery, building materials and coal transportation. The so-called remanufacturing engineering is widely used. Hot rolling rolls such as continuous casting rolls and feed rolls are key components in metallurgical production. They are in contact with high-temperature slabs for a long time, and their surface temperature can reach 500°C or even 600°C. Repeated heating and cooling makes the surface of the roll very prone to thermal fatigue and crack...

AI Technical Summary

Problems solved by technology

The addition of alloying elements such as Ni, Mo, Mn, W, V, Nb and other expensive elements will undoubtedly increase the cost, and the existence of these elements will have a negative impact on the high-temperature slag removal of the flux. The high-temperature red hardness produced by W elements is also easy Induced surfacing cracks

In addition, there are almost no reports in China that can greatly adjust the hardness of the surfacing metal by adjusting the flux composition alone