Process for manufacturing novel hearth roll collar with laser clad composite coating

Abstract

The invention provides a process for manufacturing a novel hearth roll collar with a laser cladcomposite coating. The process comprises the following steps: (1) casting a roll collar by adopting a horizontal centrifugal casting method; (2) finishing the surface to be reinforced of the roll collar; (3) pretreating the surface of the roll collar of the hearth roll of a heating furnace; (4) selecting nickel-based alloy powder as a base coat of the roll collar surface; (5) cladding the base alloy by utilizing high-power CO2 laser complete equipment; (6) coating the roll collar surface with a layer of high temperature resistance alloy powder serving as a high temperature resistance alloy coating; (7) cladding the high temperature resistance alloy coating by utilizing the high power CO2 laser complete equipment; (8) detecting the performance of the composite coating; (9) machining the roll collar surface to a required size. According to the novel high temperature resistance abrasion-resistance hearth roll collar provided by the invention, the roll collar surface is reinforced, the service life of the roll collar can be greatly prolonged, the problem of nodules on the roll collar surface can be basically solved, the roll replacing and maintaining time can be saved, the operation efficiency of the heating furnace can be improved, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of product manufacturing, and in particular relates to a manufacturing process of a furnace bottom roll ring with a novel laser cladding composite coating. Background technique [0002] The hearth roller is a key component in the conveying process of various heat treatment parts in the metallurgical industry. It is widely used in various heat treatment furnaces, including continuous annealing furnaces, heating furnaces, heat treatment normalization furnaces, etc. The hearth roller of the heating furnace plays the role of conveying the billet, and in order to ensure that the billet does not have quality problems in the subsequent rolling process, it is very important to prevent the formation of nodules on the surface of the steel rod when the steel rod is in contact with the steel plate at high temperature. Heating furnace hearth roll rings are now commonly made of Co50 alloy, and this material is the top material in t...

AI Technical Summary

Problems solved by technology

At present, there are also attempts to spray oxide ceramics on the surface of the hearth roller, such as the zirconia-yttria system and the alumina-chromia system. These ceramic coatings have a strong anti-nodulation effect at high temperatures, but at high temperatures Instable, even chemical reaction with the elements precipitated on the surface of the steel plate