Melting method of ultra-low sulfur low nitrogen steel

摘要

To provide a process for melting an extremely low sulfur and nitrogen steel having a sulfur concentration of 5 ppm or less and a nitrogen concentration of 30 ppm or less.SOLUTION: The melting process for extremely low sulfur and low nitrogen steel includes a ladle refining process for performing desulfurization treatment by using a ladle refining furnace 5. The aluminum concentration in molten steel 2 is set to 0.020 mass% or more and 0.080 mass% or less at the start of refining treatment of the ladle refining process, and the ladle refining process is carried out by using the molten steel 2.SELECTED DRAWING: Figure 1