Method For Melting Steel

摘要

A method for melting steel in an electric arc furnace (EAF). A hot heel is provided in the EAF. Metal scrap is loaded into the EAF. The metal scrap is melted in the EAF. The mass of the hot heel in relation to the mass of the metal scrap that is initially beyond the surface of the hot heel is a certain minimum. This minimum is 0.75 times the relation between the heat required to melt the metal scrap beyond the surface of the hot heel and the heat that can be taken from the hot heel without it being solidified when a theoretical heat balance calculation is applied as defined in a formula.

主权项

1. A method for melting steel in an electric arc furnace (EAF) including the steps of
providing a hot heel in the EAF, loading metal scrap into the EAF, and melting the metal scrap in the EAF,characterized in that the mass of the hot heel provided is according to the formula:mh=R(Tm-Ts)×Cps(Th-Tm)×Cpl+Qmswhere mh is the mass of the hot heel provided, ms the mass of the initially loaded scrap that is beyond the surface of the hot heel, Tm is the melting temperature of the scrap, Ts is the temperature of the scrap at loading thereof, Th is the temperature of the hot heel at the loading of the scrap, Cps is the specific heat capacity of the scrap, Cpl is the specific heat capacity of the hot heel, Q is the specific melt heat for the scrap and R is a coefficient that is at least 0.75, and in that electromagnet stirring (EMS) is applied to the process, wherein the mass of the hot heel provided is calculated through a process and control device based on stored and measured values for the parameters in the formula.