Process practice of low manganese steel in converter
In view of the unstable control of low manganese steel smelting in converter under the condition that w(Mn)≥0.200％in hot metal in WISCO,based on the research results of demangaging thermodynamics and dynamics,the control idea of low manganese smelting is determined,which includes efficient demangaging of low temperature,high(FeO)content and low basicity slag in the early stage of converter blowing,weakening bottom blowing stirring in the middle and late stages of blowing,and reducing the carbon shutdown to prevent manganese recovery.By analyzing the key influencing factors of low manganese smelting in converter,it is found that the timing of converter double slag should be controlled before 25％of the smelting progress,and the temperature before slag pouring should be lower than 1 400 ℃.The bottom blowing flow in the middle and later stages of blowing should be appropriately reduced,and the end point temperature should be controlled to 1 600-1 630 ℃,and the end point w(O)≥0.07％,which is conducive to the smelting of low manganese steel.Through the process optimization and application on site,the stable production with the end point of converter w(Mn)≤0.04％and finished product w(Mn)≤0.035％has been realized.
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