Casting technique of casting roll surface nano modification

Abstract

The invention discloses a surface nano-modification process of a cast roller, which comprises the steps of mixing Al2O3 nanoparticles and refractory aggregate by a ratio of (1 to 12): 10; grinding by a rolling mill for casting for 10 to 15 min to obtain coating nanopowder for casting; adding industrial alcohol or water to prepare casting coating 0.08 to 0.1 Kg/L; spraying or applying the coating on the cast mold surface; and filling the cast mold with molten metal to obtain the cast roller. The surface nano-modification process has the advantages that the cast roller manufactured by the process has fine surface grain structure, improved hardness (improved by 30%), reduced size of inter-crystal inclusion (reduced by one order of magnitude), and significantly improved strength, rigidity and thermal fatigue strength in comparison with a conventional process product due to the enrichment of a nano-level high-hard phase particle layer on the surface layer. The service life of the roller is improved by 60% average. Since the surface high-hard phase particles are formed before curing the roller, the surface quenching process is simpler and controllable, the subsequent thermal treatment process is simplified, and the energy consumption is lowered. Due to the high purity of nanoparticles, the secondary contamination problem of molten steel caused by alloy can be solved.

Description

technical field [0001] The invention relates to a roll casting process. Background technique [0002] The traditional composite roll production technology produces rolls with low strength, hardness, and thermal fatigue strength, and the subsequent heat treatment process is complicated and consumes a lot of energy. There is a secondary pollution problem of the alloy to the molten steel. Contents of the invention [0003] The object of the present invention is to provide a casting process for nano-modification of the surface of casting rolls. [0004] The purpose of the present invention is achieved in the following way: the AL 2 o 3 Nanomaterials and refractory aggregates are formulated according to the ratio of nanomaterials: refractory aggregates = 1 to 1.2:10, ground for 10 to 15 minutes by a roller compactor for casting, and made into nano coating powder for casting, which is blended with industrial alcohol or water to form 0.08~0.1Kg / liter of casting paint, spray o...

AI Technical Summary

Problems solved by technology

[0002] The traditional composite roll production technology produces rolls with low strength, hardness, and thermal fatigue strength, and the subsequent heat treatment process is complicated and consumes a lot of energy

There is the problem of secondary pollution of alloy to molten steel