Flux-cored welding wire and its preparation method and application

Abstract

The invention relates to a flux-cored wire used for repairing and manufacturing bending rollers and a preparation method and application of the flux-cored wire, and belongs to the field of welding materials. According to the flux-cored wire, after bead welding is carried out on the bending rollers through the flux-cored wire, steel is not attached to the roller face in the using process, and the service life is long. The flux-cored wire comprises outer skin and a flux core and is characterized in that the outer skin is a pure nickel strap, the flux core is composed of, by weight, 13.4-44.5% of metallic aluminum, 12.6-42.2% of metallic chromium, 5-13.3% of fluorite and 0-69% of metallic nickel powder; after the flux-cored wire is used, the deposition chemical components comprise, by weight, 6-8% of Cr, 6-8% of Al, 80-86% of Ni and the balanced iron and unavoidable impurities. The preparation method of the flux-cored wire is simple, and the flux-cored wire is less in welding material consumption, low in energy consumption, less in environmental pollution and high in cost performance in use.

Description

technical field [0001] The invention relates to a flux-cored welding wire used for repairing and making bending rollers, a preparation method and application thereof, and belongs to the field of welding materials. Background technique [0002] In the production of hot-rolled strip steel, the hot coil box technology is generally used to reduce the length of the rolling line, reduce power consumption and production costs. The hot coil box is installed between the rough rolling end frame and the finishing rolling flying shear. It can coil the intermediate billet after the steel throwing in the final pass into a steel coil at high speed and coreless, and then uncoil in reverse, and send the intermediate billet to to the finishing rolling mill for rolling. In the production process, in order to speed up the production rhythm, the hot coil box generally adopts a double-station working method, that is, after the first frame of the finish rolling is bitten, the steel coil at the co...

AI Technical Summary

Problems solved by technology

Due to the particularity of the above-mentioned working conditions, the service life of the bending roll is short, usually less than 3 months in Panzhihua Iron and Steel, and the roll surface is still sticking to steel during use, which directly affects the operating efficiency of the rolling mill, the quality of the steel, and maintenance costs. , which ultimately affects the cost of hot-rolled strip

The surface hardness of the bending roller repaired by this kind of welding wire is higher than 45HRC, but there are still problems of sticking steel on the roller surface and short service life in use

[0005] Due to the above-mentioned flux-cored welding wire for repairing bending rollers, the welding wire metal is generally low-alloy steel and medium-alloy steel, and this metal does not have good high-temperature strength, high-temperature hardness, poor durability, and poor stability, so that it cannot meet the needs of bending rollers. welding job requirements

Therefore, there is an urgent need to study and design a welding material to solve the problems of steel sticking on the surface of the bending roll and short service life during use

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