Method for producing low-phosphorus steel or extremely low-phosphorus steel by using limestone slag-single slag method
A limestone and low-phosphorus steel technology, applied in the field of steelmaking, can solve the problems of excessive energy and material consumption, slow lime melting speed, and increased environmental pollution, and achieve the effects of saving resources and energy, good smelting effect, and high-efficiency dephosphorization
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Embodiment 1
[0020] 120 tons of converter, the temperature of molten iron is 1300℃, the phosphorus content is 0.20%, the carbon content is 4.1%, limestone is added in 4 batches to make slag, and the weight of each batch is 1 / 2 to 1 / 8 of the total. Operate until 5 minutes before the end point, the final slag alkalinity is controlled to 5.3, and the oxygen lance position before the end point is controlled to adjust the furnace atmosphere within 50% of the decarburization lance position. The average oxygen consumption per ton of steel is 52 cubic meters. After blowing oxygen for 17 minutes, the oxygen supply strength is 3.06 cubic meters per minute·ton steel, the end point carbon content is 0.03%, and the phosphorus content is 0.004%, reaching the level of extremely low phosphorus steel. The temperature of tapping molten steel is 1610℃.
Embodiment 2
[0022] A 60-ton converter, the molten iron temperature is 1330℃, the phosphorus content is 0.15%, the carbon content is 4.3%, limestone is added in 8 batches to make slag, and the weight of each batch is 1 / 4 to 1 / 15 of the total. Operate until 3 minutes before the end point, the final slag alkalinity is controlled to 4.6, and the oxygen lance position before the end point is controlled to adjust the furnace atmosphere within 50% of the decarburization lance position. The average oxygen consumption per ton of steel is 53 cubic meters. After blowing oxygen for 14 minutes, the oxygen supply intensity is 3.79 cubic meters per minute per ton of steel, the slag temperature measurement result is 1550 degrees, the end point carbon content is 0.02%, and the phosphorus content is 0.006%, reaching the level of low-phosphorus steel. The temperature of tapping molten steel is 1640℃.
Embodiment 3
[0024] A 30-ton converter is charged with molten iron at a temperature of 1350°C, with a phosphorus content of 0.11% and a carbon content of 4.6%. Limestone is added in 13 batches to make slag. The weight of each batch is 1 / 6 to 1 / 20 of the total. Before the end, the oxygen lance position before the end point is controlled within 50% of the decarburization lance position to adjust the furnace atmosphere. The average oxygen consumption per ton of steel is 55 cubic meters, oxygen blowing for 12 minutes, and the oxygen supply intensity is 4.58 cubic meters. / Min·ton steel, the final slag alkalinity is controlled to 3.8, the end point carbon content is 0.10%, and the phosphorus content is 0.01%, reaching the level of low-phosphorus steel. The temperature of tapping molten steel is 1670℃.
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