The medium frequency furnace is used to produce cast iron rolls of various purposes and materials, and the core is made of nodular cast iron. However, due to the particularity of the smelting process of the medium frequency furnace, it is difficult to deoxidize, dephosphorize and degasify. There are problems in the molten metal mixed with impurities in the charge, oxides generated by the oxidation of metal elements, eroded furnace lining materials, chemical composition control, temperature control, poor spheroidization inoculation, etc. there are surface pinholes and pores, slag inclusions, poor spheroidization, uneven composition, uneven hardness, shrinkage and porosity Low strength of roll neck and common quality defects.
The high-speed development of modern rolling technology requires high strength and wear resistance of rolls, high steel throughput, etc. it is necessary to improve the smelting process and improve the quality of rolls to meet the requirements of users.
Through the analysis of various factors affecting the quality of nodular cast iron roll, the optimization is carried out from the aspects of chemical composition design, temperature control, batching, spheroidizing treatment, inoculation treatment and process control. The quality of the core of the produced nodular cast iron roll has been improved, and the properties of the roll have been greatly improved, which solves the contradiction between the continuously improved rolling working conditions on the rolling site and the insufficient performance of the roll.