Laser cladding treatment process for heating furnace hearth roll collar surface

Abstract

The invention relates to a laser cladding treatment process for a heating furnace hearth roll collar surface. The process comprises the steps of: cleaning a heating furnace hearth roll collar surface; conveying Co based alloy powder by a coaxial or paraxial powder feeding mode, selecting a carbon dioxide laser to rapidly scan the cleaned roll collar surface by means of narrowband or broadband scanning so as to realize alloying treatment of the heating furnace hearth roll collar surface, thus obtaining an alloying layer; and conducting crack and flaw detection and judging whether crack is produced. The process provided by the invention reinforces the hearth roll collar surface, improves the service life of the roll collar, basically solves the problem of nodulation on the roll collar surface, saves the roll changing time and maintenance time, improves the heating furnace work efficiency, and reduces the production cost.

Description

technical field

[0001] The invention relates to the field of surface strengthening technology of a bottom roller ring of a heating furnace, in particular to a laser cladding treatment process for the ring surface of a bottom roller of a heating furnace. 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, an...