Simulation of Inclusion Removal Behavior of High Al Molten Steel Fed with Composite-Cored Wire

In order to solve the problems of low metal yield and insufficient modification of inclusions in high Al steel with traditional feeding calcium wire technology, feeding composite calcium aluminate-cored wire into molten steel was proposed in this study, and the melting behavior of composite-cored wires with different diameters in molten steel were found with the numerical simulation and water model test methods, as well as the effect on the flow field of molten steel and the removal ratio of inclusions with feeding-cored wires. The numerical simulation results of the cored wire melting showed that the composite-cored wire with a cored powder diameter of 11 mm and a casing thickness of 1.07 mm satisfied the ideal condition of feeding speed of 2 to 4 m/s. The water model experiment results of feeding composite-cored wire showed that when the feeding depth was 100 to 300 mm, the increase rates of inclusion removal ratio of ≤ 50, 50 to 100, and 100 to 150 μm were 3.29, 2.71, and 2.56 pct, respectively. When the feeding depth was 100 mm from the bottom of the ladle, the ≤ 50, 50 to 100, and 100 to 150 μm inclusions removal rate increased by 4.58, 3.01, and 2.42 pct for increasing each 50 μm in the size of the composite-cored powder.