The Peroxidation of molten steel at the end of the converter will not only lead to the decrease of alloy yield and the increase of smelting cost， but also lead to the increase of deoxidation products and the poor cleanliness of molten steel. Therefore， it is always the key point of process control to avoid the peroxide of molten steel at the end of converter. Aiming at the problem of terminal peroxide of 100 t converter in a domestic factory， this study finds that the average scrap ratio of this factory is up to 26%， the average terminal C content is only 0.055%， and the average terminal temperature is 1 605 ℃. Without considering the heat balance in the furnace， the adoption of high scrap steel batching resulted in insufficient heat in the furnace， which forced the supplementary blowing to raise the temperature， resulting in a low hit rate of the terminal carbon and temperature， and then lead to the problem of molten steel peroxidation. Therefore， from the perspective of optimizing the burden design， this study establishes the calculation model of the maximum scrap ratio based on the raw material conditions of the plant. In the actual production， the raw material conditions are comprehensively considered to add scrap， which reduces the number of heats requiring supplementary blowing for temperature rise. After the application of the model， the end point temperature of converter increases by 10 ℃， the end point carbon content increases by 0.036%， and the oxygen content of molten steel decreases by 206.3×10

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. The data shows that the effect of cost reduction and quality improvement is significant