Production control method for ultra-low limit sulfur in low-carbon low-phosphorus clean steel
A production control method and a technology for cleaning steel, which are applied in the field of metallurgical steelmaking, can solve the problems of secondary oxidation control of molten steel with unfavorable cleanliness of molten steel, increase in process energy consumption and smelting cost, and high process temperature loss, and achieve stable carbon pulling effect, The effect of avoiding the phosphorus return of molten steel and low production cost
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Embodiment 1
[0033] The production control method of ultra-low limit sulfur in low-carbon, low-phosphorus clean steel of this embodiment comprises the following steps:
[0034] Step 1: Pre-desulfurization of molten iron by online mixing and injection, testing of molten iron in converter loading: [S] 0.0011%, temperature 1350°C;
[0035] The second step: enter the converter smelting, carry out a slag pouring after 18 minutes of converter smelting, measure the temperature at 1480°C, and pour out 60% of the amount, and then carry out supplementary slag making in the converter, and the amount of high-quality lime added is 36kg·t -1 , lightly burned dolomite according to 12kg·t -1 ;At the end of converter smelting, bottom blowing argon gas is used to strengthen the stirring function, the time is 190s, and the stirring intensity is 0.052Nm 3 ·t -1 min -1 ;Converter end point test: [C]0.025%, [S]0.0067%, [P]0.0074%, temperature 1690°C, the thickness of the slag layer under the converter is about...
Embodiment 2
[0040] The production control method of ultra-low limit sulfur in low-carbon, low-phosphorus clean steel of this embodiment comprises the following steps:
[0041] Step 1: Pre-desulfurization of molten iron by online mixing and injection, testing of molten iron in converter loading: [S] 0.0008%, temperature 1370°C;
[0042] The second step: enter the converter smelting, carry out slag pouring once after 20 minutes of converter smelting, measure the temperature at 1520°C, and pour out 55% of the amount, and then carry out supplementary slag making in the converter, adding 33kg·t of high-quality lime -1 , lightly burnt dolomite according to 10kg·t -1 Adding, the bottom blowing argon gas is used to strengthen the stirring function at the end of converter smelting, the time is 195s, and the stirring intensity is 0.058Nm 3 ·t -1 min -1 ;Converter end point test: [C]0.022%, [S]0.0061%, [P]0.0069%, temperature 1689°C, the thickness of the slag layer under the converter is about 30...
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