A wear-resistant particle-wear flux-cored welding wire for coal grinding rollers and its preparation method

Abstract

The invention provides a flux-cored wire resistant to abrasive wear for a coal grinding roller. The flux-cored wire comprises flux-cored powder and a sheath. The particle size of the flux-cored powderis 180-200 meshes, and the flux-cored powder comprises, by mass, 3%-12% of ferro-boron, 12%-26% of hafnium metal powder, 0.5%-8% of titanium dioxide, 1%-12% of ferro-molybdenum, 1%-10% of nickel powder, 1%-5% of silicon powder, 1%-6% of manganese powder, 0.2%-3% of copper powder, 0.1%-5% of rare earth additives and the balance iron powder. The hardness of a sample obtained by surfacing with the wire provided by the invention is higher, and the wire is resistant to the abrasive wear; the relative wear resistance is 2-3 times the relative wear resistance of white cast iron KmTBCr26 materials, and the flux-cored wire is especially applicable for surfacing of the coal grinding roller, such as raw and clinker grinding mills of a cement plant, and grinding roller sleeves and lining plates of coal grinding machines, and existing ceramic products can be replaced completely.

Description

technical field [0001] The invention belongs to the field of welding materials, and in particular relates to a wear-resistant flux-cored welding wire for coal grinding rollers and a preparation method thereof. Background technique [0002] The grinding roller is the most important part of the mill. The quality directly affects the grinding effect of the equipment. The hardness, wear resistance and surface processing requirements are the most important quality indicators of the grinding roller. Grinding rollers with unqualified hardness and wear resistance cannot be made into high-quality grinding rollers by cutting. When the mill is working, the grinding rollers not only have to bear the wear of abrasive materials such as gravel and sand, but also bear a certain impact load. Therefore, the grinding rollers must have high wear resistance, hardness and certain impact toughness. After a certain period of service, the grinding rollers will be severely worn and cannot work norma...

AI Technical Summary

Problems solved by technology

[0004] CN105312795A discloses a high-niobium and high-chromium alloy cast iron self-shielding flux-cored welding wire for grinding roller surfacing welding and a preparation method thereof. The welding wire is composed of a ferritic stainless steel strip and wrapped powder, and the powder composition includes high-carbon ferrochrome, ferroniobium, Graphite, ferrosilicon, electrolytic manganese metal, medium carbon ferroboron, aluminum-magnesium alloy, cryolite, fluorite, lithium carbonate, zircon sand, potassium titanate, sodium titanate and iron powder, the preparation method is to add the powder after pretreatment In the U-shaped groove, four times of continuous drawing and diameter reduction are carried out after the opening to obtain a flux-cored welding wire. The flux-cored welding wire provided by the invention has stable hardness of the deposited metal in the surfacing layer, less welding spatter, and good resistance to high stress wear. The advantages of particle wear resistance are suitable for surfacing repair and remanufacturing of cement grinding rollers. However, the invention provides many types of formula raw materials, and the preparation in the early stage is more complicated

The welding wire provided by the invention is low in cost, high in hardness and good in wear resistance, but excessive high carbon ferrochrome content will have a bad influence on the welding performance

[0005] To sum up, there is still a lack of a flux-cored wire specially used for coal grinding rollers with excellent welding performance, which can significantly improve the wear resistance of cladding metal and high welding efficiency.

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