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Ultra-low carbon steel is required for high-performance steel products. Nowadays, the demand of progress in the both of amount and quality is strongly required. At a steelmaking shop, the vacuum degassing process is used as a ladle refining process, e.g., RH and tank degasser. In such processes, the decarburization rate of the vacuum degassing treatment, according to the decreasing carbon content, decreases because of the setting down of the CO boil formation. Kraus1) studied the critical condition of CO bubble formation theoretically, and, in addition, several experimental studies were reported.2–5) Their results showed the supersaturation of CO partial pressure during CO bubble formation, and its value was reported as 1–16 (kPa). Therefore, it is common practice to perform the decarburization under the low CO partial pressure condition. Sain et al.6) showed the inhibiting effect of the solute sulfur adsorption on the carbon removal reaction. Further, Harashima et al.7,8) reported that the decarburization reacEffect of the Chromium Content and Argon Bubbling in the Carbon Removal Rate from Low Carbon Liquid Steel under Reduced Pressure Condition