Abstract: Two converter methods (dephosphorization converter + decarburized converter) were used to produce super low phosphorus steel according to the dephosphorization mechanism in the high phosphorus (0.12 %) hot metal conditions of Ansteel Bayuquan steelmaking department. The process parameters in dephosphorization converter and decarburized converter for two converter methods were researched in application process. The pre-smelting dephosphorization rate was controlled above 85 %, and the average phosphorus mass fraction was controlled in 0.018 % in dephosphorization furnace. The average phosphorus mass fraction was controlled in 0.001 2 % at smelting end-point. The average phosphorus mass fraction in the end product was controlled below 0.002 0 %. And the mass production of super low phosphorus steel under the condition of high phosphorus hot metal was realized.

Key words: super low phosphorus steel, dephosphorization, two converter method, combined blowing, converter