Abstract: The floater in mould were analyzed by sampling the floater of mould and the molten steel in tundish during high silicon titanium stabilized austenitic stainless steel casting process. The results show that the inclusions in the floater of mould and tundish are both mainly pure TiN and TiN with MgO·Al₂O₃ as core. TiN inclusions are the cause of floater in mould. By combining both the experimental results and thermodynamic calculation, TiN inclusions would be formed at liquidus temperature of 1 455 ℃. As the mass fraction of nitrogen is less than 0.01 % in molten steel and the temperature in tundish is higher than 1 500 ℃,the floater cannot been found in mould.

Key words: high silicon titanium stabilized austenitic stainless steel, TiN, floater in mould, tundish