Explanation
non-alloy steel cast directly into steel ingots without silicon or aluminum deoxidation and without sedation treatment. When rimmed steel solidifies, the residual oxygen in steel water and the carbon melted in the steel water form CO gas, which escapes. In addition, the water solubility of oxygen in solid steel is much lower than that in liquid steel, so that the liquid steel will boil in the ingot mold.
Classification
Metals -> Steels -> Non-alloy steels