Method for improving inner quality of continuous casting billet with thick and large section
A technology of internal quality and continuous casting slabs, which is applied in the field of slab manufacturing, can solve the problems of macro segregation defects of thick and large section continuous casting slabs, the inability to realize axial gravity feeding of slabs, and the difficulty of completely eliminating shrinkage cavity and porosity defects To achieve the effect of reducing porosity and segregation defects, reducing shrinkage porosity defects, shortening precipitation and aggregation time
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Embodiment 1
[0063] In this embodiment, the method involved in the present invention is used to produce a continuous casting slab with a section size of 320×350 mm, and the material of the continuous casting slab is Q345. The molten steel is smelted in a converter, then refined in an LF refining furnace, and then transferred to a VD vacuum degassing furnace for deoxidation and degassing, and a Si-Ca alloy is used for final deoxidation. In this embodiment, the amount of residual aluminum in the molten metal is 0.018wt%, and the gas and impurity elements are: T[O]=10ppm, [S]=0.008wt%, [P]=0.009wt%.
[0064] The micro-zone oscillation technology is used in the mold, the number of probes is 2, the diameter of the probe is Φ80mm, the probe is inserted 120mm below the metal liquid level of the mold, the vibration frequency is 50HZ, and the amplitude is 4mm. The molten steel is poured into the tundish at 1570°C (the superheat is 60°C). During continuous casting and casting, the temperature of mo...
Embodiment 2
[0067] In this embodiment, the method involved in the present invention is used to produce thick and large-section vertical continuous casting round billets, the material of which is 20CrNi2Mo, and the diameter is Φ900mm. The molten steel is smelted in an electric arc furnace, refined in an LF refining furnace, and then transferred to a VD vacuum degassing furnace for deoxidation and degassing, and Ca is used for final deoxidation. In this embodiment, the amount of residual aluminum in the molten metal is 0.020wt%, and the gas and impurity elements are: T[O]=12ppm, [S]=0.009wt%, [P]=0.008wt%.
[0068] The micro-zone oscillation technology is used in the tundish and crystallizer. The number of probes in the tundish is 3, and the number of probes in the mold is 2. The diameter of the probe is Φ120mm. The probe is inserted 150mm below the metal liquid surface, the vibration frequency is 30HZ, and the amplitude is 6mm. The molten steel is poured into the tundish at 1580°C (the sup...
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