Reconditioning of continuous casting machine rollers by laser cladding

Abstract

The article presents the results of research of structures, compositions and tribological characteristics of coatings for continuous casting machine rollers. The coatings under research were obtained by methods of arc and laser cladding. The experiments were carried out on cylindrical samples of steel 20Cr13. A flux cored wire PP-Np-25Cr5VMoSi was taken as a material for cladding by the arc method. Sparingly alloyed iron-based powder Fe-Co-Cr-Mo was chosen as the material for laser cladding. The estimation of coating properties was carried out by the method of structural and phase analysis. Friction coefficients and wear rates for each cladding material were determined. The article offers an explanation of the differences in the properties of the coatings, which is based on the analysis of their formation conditions, as well as an assessment of the effectiveness of laser cladding in reconditioning of metallurgical equipment parts.