Sulfur contained in hot metal is an undesirable element because it causes hot brittleness in steel and adversely affects the rollability and weldability. Therefore, prior to the liquid steel production process, the desulfurization process in hot metal is carried out by Co-Injection (Granular Magnesium) method. For the fastest desulfurization process, it uses GRANULAR MAGNESIUM as main a desulfurization element.