Method for adding spheroidizing agent of composite roll core part ball-milling cast iron

Abstract

The invention relates to a method for adding a spheroidizing agent of composite roll core part ball-milling cast iron, and belongs to the technical field of metallurgical casting. The core part ball-milling cast iron comprises the following components of, in percentage by weight 3.2%-3.8% of C, 1.8-%-2.2% of Si, less than or equal to 0.8% of Mn, less than or equal to 0.05% of P, less than or equalto 0.02% of S, 0.03%-0.06% of Mg, 0.01%-0.03% of Re, and the balance Fe; a rare earth magnesium spheroidizing agent is added in the discharging process of molten iron, the rare earth magnesium spheroidizing agent is added to the steel ladle, the content of Mg of the rare earth magnesium spheroidizing agent is 11%, and the content of the rare earth is 2%, and the adding amount of the rare earth magnesium spheroidizing agent is obtained by calculating an accounting formula related to the content of molten iron and S, the spheroidizing temperature and the discharging amount of molten iron. According to the method, the addition amount of the spheroidizing agent is determined through accurate control, the stability of residual Mg can be improved, the prepared ball-milling cast iron has high strength, and the accident resistance of the composite roller can be improved.

Description

technical field [0001] The invention relates to a method for adding a nodularizing agent to the nodular cast iron at the core of a composite roll, and belongs to the technical field of metallurgical casting. Background technique [0002] The smelting of raw molten iron, spheroidizing treatment and inoculation treatment are three key links in the manufacturing process of ductile iron. The spheroidizing inoculation effect of molten iron ultimately determines the shape of graphite precipitation, the eutectic solidification characteristics and the quality of solidified castings. At present, most foundries adopt the excessive spheroidization method according to actual production conditions to ensure the spheroidization effect of graphite in castings. However, if the spheroidization and inoculation treatment are not carried out according to the actual metallurgical state of the original molten iron, the problem is not only the increase in production costs caused by the excessive ...

AI Technical Summary

Problems solved by technology

The existing spheroidizing inoculation control method is to add spheroidizing inoculant according to the effect detection after the molten iron spheroidizing inoculation treatment or the molten iron is left to stand (when the spheroidizing is excessive, the active Mg overflows the surface of the molten iron and is consumed by spontaneous combustion, and it can also be added The former molten iron dilutes the spheroidizing elements) to achieve the purpose, but according to the actual metallurgical state of the original molten iron, the dynamic implementation of spheroidizing inoculation treatment has not been reported.