The life of converter steel mouth is one of the indicators of the converter steelmaking technology. Frequently subjected to high temperature of molten steel and high oxidizing slag direct erosion and severe erosion, combined with good thermal shock resulting in steel mouth easily damaged. The lengths of their life directly affect the smelting cycle, the effect of steelmaking productivity and slag, thereby affecting the quality of steel. The mouth of the steel intact degrees the direct control of the converter slag, and the alloy yield and further processing (the LFV, RH, etc.) processes have a direct impact. Therefore, the converter steelworks family at home and abroad converter steel placed in very important position, and carried out research work. Kakogawa steel mills in Japan, the United States Inland Steel Corporation, the domestic Baosteel, Wuhan Iron and Steel, TISCO etc. tapping hole life have improved.

A steel mouth Material selection

Mainly by tapping hole: ① loaded molten iron to steel process, in the high temperature gas, oxidative damage; ② In the process of the steel in high-temperature steel flow, high temperature slag by wear, oxidation damage; ③ by thermal shock damage. In order to meet the needs of the steelmaking process development at home and abroad since the late 1970s, 

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