The solute redistribution in directional melting process is theoretically s
tudied. Based on quantitative evaluations, uniform solute distribution in l
iquid and a quasi-steady solute distribution in solid are supposed. The dis
cussion on the solute balance comes to a simple model for the solute redist
ribution in directional melting process. As an example, the variation of li
quid composition during melting process of carbon steel is quantitatively e
valuated using the model. Results show that the melting of an alloy starts
at solidus temperature, but approaches the liquidus temperature after a ver
y short transient process.