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The service life of blast furnace (BF) is largely determined by the erosion of carbon brick,1,2) the erosion is inevitable due to the direct contact between carbon-undersaturated molten pig iron and carbon brick.3,4) The erosion rate is affected by temperature, element content, the flow of molten pig iron et al.,5) to reduce the erosion rate of carbon brick has become the primary target to prolong the service life of BF. Sulfur is a harmful element in molten pig iron.6) It is not economical to conduct a deep desulphurization in BF although the desulphurization (working) conditions of BF becomes better.7–9) With the development of desulphurization in pretreatment of molten pig iron, sulfur in molten pig iron can be removed to less than 0.01% in a short time due to good thermodynamic and kinetic conditions for desulphurization. It has become a trend of most BFs to rely on external desulphurization to reduce cost.10–14) Therefore, sulfur content in molten pig iron is gradually improved, and the erosion rate of carbon brick in hearth is affected by this change. On the other hand, raw materials containing titania charged in BF is an effective measure to protect the hearth at the end of the service.15–18) The titania in iron ore is reduced to form titanium and the titanium is dissolved into molten Effects of Sulfur and Titanium Interaction in Molten Pig Iron on Erosion of Carbon Brick