Abstract: The process of tapping without waiting sample based on sublance technique was introduced. Based on the thermodynamic analysis, combined with large data statistical analysis, the relationship between the parameters measured by sublance and the phosphorus content in molten steel was studied. The results showed that phosphorus content increased linearly with main-blow temperature.With the increasing of main-blow carbon content, phosphorus content increased and the increase amount was not obvious when main-blow carbon mass fraction was over 0.40 %.With the increasing of end-point temperature, phosphorus content increased. With the increasing of endpoint oxygen, phosphorus content decreased and the decrease amount was not obvious when end-point oxygen mass fraction was over 500×10^-6.When end-point temperature was higher than 1 685 ℃ or end-point oxygen mass fraction was lower than 300×10^-6, phosphorus content fluctuated greatly. The process practice showed that when the main-blow temperature or carbon was high, the auxiliary blowing should be adjusted properly to avoid the end-point oxygen too low or the end-point temperature too high, which could effectively reduce the occurrence of high phosphorus and meet the requirements of dephosphorization effect of converter. This process provided an important way to shorten the smelting cycle, reduce the energy consumption of steelmaking process and refractory consumption.

Key words: sublance, dephosphorization, tapping without waiting sample, smelting cycle