Effect of the Multi-Electromagnetic Fields on the Solidification Process of the Continuous Casting Hollow Billet

Abstract

In order to optimize the process parameters of continuous casting hollow billet with multi-electromagnetic fields, the solidification process of the continuous casting hollow billet was studied by the numerical simulation method, the results show that: 1) when only solenoid coil is imposed on outside of the outer-mold, it generates a lot of joule heat near the outer-side surface of hollow billet and leads to the uneven thickness of the solidified shell which is easily cause the crack defect. 2) when only traveling stirring electromagnetic field is imposed in the inside of the inner-mold, it can homogenize the temperature distribution of the molten metal and decrease the sump height, but it can also result in the uneven thickness of the solidified shell because of the nonuniform flow of molten metal. 3) when the above two kinds of electromagnetic field are applied simultaneously, the multi-electromagnetic fields can improve the homogeneous thickness of the solidified shell and decrease the sump height which is better for the high casting velocity and hollow billet quality.