Hydrogen Content Control and Improvement of Central Carbon Segregation of Slab

The change of hydrogen content during steelmaking process was investigated firstly. It was found that hydrogen content in liquid steel is rapidly increased in LF process. In the slab, the negative carbon segregation region and positive segregation in the center are observed simultaneously. By using simplified diffusion equation, the element diffusion model was built for 12-slab stack cooling process. The surface temperature of each slab was measured at different stack cooling time. Applying the measured temperature to the model, carbon and hydrogen diffusion results were calculated. Using these results, it can be concluded that slab stack cooling can promote the diffusion of hydrogen, but weakly affect central carbon segregation. Increasing the temperature and holding time of reheating, central carbon segregation can be improved a great deal.