Desulfurization method of medium and low grade cold rolling non-oriented molten silicon steel
A technology of oriented silicon steel and low grade, which is applied in the field of desulfurization of cold rolled non-oriented silicon steel of medium and low grades. The effect of improving, improving quality and improving service life
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Embodiment 1
[0050] What this embodiment deals with is the molten steel of medium grade 50TW470 cold-rolled non-oriented silicon steel. The ladle capacity is 80 tons.
[0051] The weight percentage of the composition of the middle grade 50TW470 cold-rolled non-oriented silicon steel is:
[0052] C≤0.004%; Si 1.50-1.70%; Mn 0.20-0.40%; P≤0.030%; S≤0.005%; Al 0.20-0.40%; the rest is Fe and unavoidable impurities.
[0053] I Deoxidation after tapping from converter
[0054] Pour 82 tons of pretreated molten iron with S content of S=0.0024% by weight and 8 tons of steel scrap into the converter. =0.046%, the temperature is 1690°C, and the weight percentage of the composition of the molten steel reaches the following values:
[0055] C 0.046%; Si 0.01%; Mn 0.02%; P 0.007%; S 0.0065%; the rest is Fe and unavoidable impurities.
[0056] Add 200kg of lime, 100kg of pre-melted slag, and 300kg of aluminum and iron to the ladle during tapping; add 300kg of lime, 200kg of pre-melted slag, and 100k...
Embodiment 2
[0073] What this embodiment deals with is low-grade 50TW600 cold-rolled non-oriented silicon steel molten steel, with a ladle capacity of 80 tons.
[0074] The composition percentage of low-grade 50TW600 cold-rolled non-oriented silicon steel is:
[0075] C≤0.005%; Si 1.25-1.50%; Mn 0.2-0.4%; P≤0.020; S≤0.005%; Al 0.20-0.32%; the rest is Fe and unavoidable impurities.
[0076] This embodiment is the following sequential steps:
[0077] I Deoxidation after tapping from converter
[0078] Pour 82 tons of pretreated molten iron with S content of S = 0.0022% in the molten iron into the converter. %, the temperature is 1680-1700°C, and the weight percentage of the composition of molten steel reaches the following values:
[0079] C 0.03%; Si 0.01%; Mn 0.03%; P 0.011%; S 0.0052%; the rest is Fe and unavoidable impurities.
[0080] Add 200kg of lime, 100kg of pre-melted slag, and 300kg of aluminum and iron into the ladle during tapping; add 300kg of lime, 150kg of pre-melted slag...
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