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Ferroalloys are necessary raw materials in the steel making process,1–4) which are used for deoxidation and alloying. Therefore, the cost of ferroalloys in the steel making is significant. During smelting of interstitial free (IF) steel, a certain amount of ferrotitanium is used as titanium resource. Titanium element can combine with carbon atom, which is beneficial for improving plasticity and excellent drawability of IF steel. In general, in the refining of IF steel, ferrotitanium is added into molten steel in RH de-gasser 3–5 minutes after final deoxidation. The yield of ferrotitanium decreases inevitably because of oxidation and physical loss in the addition process. In Shougang Jingtang United Iron and Steel about 0.69 kg titanium is needed per ton IF steel, which is equivalent to 1 kg Fe-70%Ti alloy. However, price of ferrotitanium is high. So, if the yield of ferrotitanium increases further, a large amount of cost could be saved. In recent years, usage of all kinds of ferroalloys in the steel making has been receiving more and more attentions.5–11) Zhu et al.2) proposed deoxidation mechanism of Al-killed in the industrial refining based on the measured and calculated oxygen activities in Al-killed bulk steel. In order to add nitrogen into normal steel and stainless steel, Gaye et al.12) investigated nitrogen alloying of carbon or stainless steels by bottom nitrogen gas injection in convertEffect of Size of Ferrotitanium on the Melting Behavior and the Yield in the Refining of Interstitial Free Steel by RH De-gasser