Nowadays, more and more scrap is required to be added in the bath of the converter accompanied by the increasing requirements on the environment and increasing volume of available scrap in China. Consequently, the melting rate of the scrap would be significant if a large amount of scrap is added into the bath for the steelmaking process. The carbon content, temperature, and flow of the bath are the main factors that influence the scrap melting process in a bath of hot metal. The current study mainly focused on the effects of bath flow on the melting behavior based on a scrap melting process performed in the experiment in which the scrap melting behavior in a bath was investigated. Specifically, the effects of nature convection and driven convection on the meting process were investigated by applying a mathematical model. The results found that nature convection was formed in the vicinity of the melting interface when a scrap bar was immersed in the melting bath of hot metal. As a result, the heat transfer between bath and scrap can be enhanced by the flow at the melting interface. Also, the hot metal with high carbon content was driven to the melting interface. In turn, the melting rate was accelerated. The intensity of nature convection decreased when the initial temperature of the scrap was increased. The melting rate was remarkably increased when the driven convection was introduced to the bath. Compared to the initial temperature of 25℃ with a melting rate of 107 mm3/s, the melting rate was only 50 mm3/s when the initial temperature of scrap was 1000℃ at 5 s. In addition, when the melting was performed at 15 s, the rest volume of the scrap with the nature convection was 1054 mm3, which was 2.3 times for driven convection with the driven flow velocity of 0.15 m/s. Also, the melting rate of the scrap with the driven flow velocity of 0.15 m/s was about 1.8 times that of the nature convection at 10 s.