Abstract: This paper introduces the material selection and preparation process of melt pump bearing bush of the extrusion granulator and conducts a comprehensive analysis and testing of the homemade bearing bush. 0Cr13Ni4Mo was selected as the matrix for the melt pump bearing bush of the extrusion granulator, and Stellite 6B alloy was clad on the inner wall and end face of the bearing bush by laser melting. Comparative analysis and test results show that the performance and parameters (e.g. composition, hardness, metallurgical organization, physical analysis of the coating, macroscopic profile, etc.) of the homemade bearing bush is close to that of the imported one, which indicates that the product preparation technology has made a breakthrough, and the imported bearing bush can be completely replaced by homemade one. This has filled the gap domestically in this field.

Key words: extrusion granulator, melt pump, bearing bush, laser cladding