A control method for oxide inclusions in ultra-low carbon steel produced by ld-rh process
A technology of ultra-low carbon steel and control method, which can be applied in the direction of improving process efficiency, manufacturing converters, etc., and can solve problems such as difficulty in determining the process effect.
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Embodiment 1
[0030]Converter blowing is completed, [C]=280ppm, [O]=650ppm, slag is blocked and tapped to ensure ladle slag thickness ≤ 50mm, lime 2.2-2.5kg / t steel is added at the beginning of tapping, and aluminum slag is added at the end of 0.8-1.0kg / t steel, ladle top slag composition before vacuum treatment (FeO wt%)+(MnO wt%)=6.7%, [(CaO wt%)+(MgO wt%)] / (Al 2 o 3 wt%)=1.72, and the slag thickness is 130mm.
[0031] In the RH furnace, vacuum decarburization treatment is carried out so that the carbon in the molten steel is below the required value of the finished product. After the vacuum decarburization is completed, Al is added to deoxidize the molten steel, followed by adding a refining agent of 0.7kg / t steel from the high-level silo. The composition of the refining agent is shown in Table 1. The molten steel is purely circulated for 2-7 minutes, the molten steel is alloyed, and the composition of the molten steel is adjusted to the specification range. The molten steel is purel...
Embodiment 2
[0034] Converter blowing is completed, [C] = 340ppm, [O] = 580ppm, slag blocking and tapping, to ensure that the ladle slag thickness is ≤ 50mm, add lime 2.3-2.7kg / t steel at the beginning of tapping, and add aluminum slag 0.9-1.2kg at the end / t steel, ladle top slag composition (FeOwt%)+(MnOwt%)=6.5% before vacuum treatment, [(CaO wt%)+(MgOwt%)] / (Al 2 o 3 wt%)=1.77, and the slag thickness is 132mm.
[0035] In the RH furnace, vacuum decarburization treatment is carried out so that the carbon in the molten steel is below the required value of the finished product. After the vacuum decarburization is completed, Al is added to deoxidize the molten steel, followed by adding a refining agent of 1.04kg / t steel from the high-level silo. The composition of the refining agent is shown in Table 1. The molten steel is purely circulated for 2-8 minutes, the molten steel is alloyed, and the composition of the molten steel is adjusted to the specification range. The molten steel purely...
Embodiment 3
[0038] Converter blowing is completed, [C] = 270ppm, [O] = 645ppm, slag is blocked and tapped to ensure ladle slag thickness ≤ 50mm, lime 2.5-3.4kg / t steel is added at the beginning of tapping, and aluminum slag is added at the end 0.7-0.9kg / t steel, ladle top slag composition (FeOwt%)+(MnOwt%)=6.2% before vacuum treatment, [(CaO wt%)+(MgOwt%)] / (Al 2 o 3 wt%)=1.82, and the slag thickness is 133mm.
[0039] In the RH furnace, vacuum decarburization treatment is carried out so that the carbon in the molten steel is below the required value of the finished product. After the vacuum decarburization is completed, Al is added to deoxidize the molten steel, followed by adding a refining agent of 0.48kg / t steel from the high-level silo. The composition of the refining agent is shown in Table 1. The molten steel is purely circulated for 3-7 minutes, the molten steel is alloyed, and the composition of the molten steel is adjusted to the specification range. The molten steel is purel...
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