Ladle furnace (LF) refining technology
A process, converter blowing technology, applied in the field of LF furnace refining process, to achieve the effect of reducing consumption, saving costs, and less chemical input
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Embodiment 1
[0029] Embodiment 1: as figure 1 As shown, a LF furnace refining process includes the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.04%, S: 0.009%;
[0030] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1520°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 100L / min, and the pressure of argon gas is 0.3MPa;
[0031] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;
[0032] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argo...
Embodiment 2
[0037] Embodiment 2: A LF furnace refining process, comprising the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.041%, S: 0.0095%;
[0038] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1530°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 125L / min, and the pressure of argon gas is 0.35MPa;
[0039] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;
[0040] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argon pressure to 0.3MP...
Embodiment 3
[0045] Embodiment 3: a LF furnace refining process, comprising the following steps: the initial carbon and sulfur content of molten steel entering the LF furnace is C: 0.04%, S: 0.0088%;
[0046] Step 1: Put the molten steel qualified by converter blowing into the LF furnace, the temperature of the molten steel is controlled at 1540°C, the composition of the molten steel is C0.37-0.42%, Si0.10-0.17%, Mn0.5-0.6%, P≤0.025 %, T[O]≤30ppm, argon gas is blown at the bottom of the LF furnace when tapping, the flow rate of argon gas is 150L / min, and the pressure of argon gas is 0.4MPa;
[0047] Step 2, power transmission and heating, the current is 25000A, the heating slagging time is 10min, the argon flow rate is 250L / min, the argon pressure is 0.3MPa during the slagging process, temperature measurement and sampling;
[0048] Step 3, adjust the current to 30000A, add lime in 2-3 batches, the amount of lime added is 500kg, adjust the argon flow rate to 50L / min, argon pressure to 0.3MP...
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