Method capable of improving quality of large-section peritectic steel continuous casting billet
A continuous casting billet and large-section technology, applied in the field of metallurgy, can solve the problems of affecting the mechanical properties of the finished steel plate, slowing down the growth of the billet shell, and high surface temperature of the billet shell, so as to reduce the content of inclusions and reduce the surface cracks of the billet. , the effect of high melting rate
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Embodiment 1
[0053] In this embodiment, the continuous casting slab of large-section cladding steel has a cross-sectional size of 330×2400 mm, and the material of the slab is Q345R.
[0054] The production method of the continuous casting slab of large-section cladding steel in this embodiment is as follows:
[0055] The molten steel is smelted in a converter, refined in an LF furnace, and then transferred to a VD furnace for vacuum deoxidation and degassing. After the vacuum is completed, 2.0kg / t of steel is fed into the calcium wire for final deoxidation and inclusion denaturation treatment, and softening before casting. Blow for 10 minutes, T[Ca] / [Al]s is 0.11, which promotes the floating of inclusions. The aluminum content in molten steel is 0.025%, the gas and impurity element content is: T[N]: 40ppm, T[O]: 15ppm, T[H]: 1.5ppm, T[S]: 0.003%, T[P] : 0.005%.
[0056] The molten steel is cast into the tundish at 1575°C, and the superheat of the tundish is 55°C. During continuous casti...
Embodiment 2
[0063] In this embodiment, the continuous casting slab of large-section cladding steel has a section size of 300×2400mm, and the material of the slab is Q690D.
[0064] The production method of the continuous casting slab of large-section cladding steel in this embodiment is as follows:
[0065] The molten steel is smelted in a converter, refined in an LF furnace, and then transferred to a VD furnace for vacuum deoxidation and degassing. After the vacuum is completed, 2.2kg / t of calcium wire is fed into the steel for final deoxidation and inclusion denaturation treatment, and softening before casting. After blowing for 11 minutes, T[Ca] / [Al]s is 0.13, which promotes the floating of inclusions. The aluminum content in molten steel is 0.030%, the gas and impurity element content is: T[N]: 40ppm, T[O]: 20ppm, T[H]: 1.5ppm, T[S]: 0.004%, T[P] : 0.004%.
[0066] The molten steel is cast into the tundish at 1570°C, and the superheat of the tundish is 50°C. During continuous casti...
Embodiment 3
[0073] In this embodiment, the continuous casting slab of large-section cladding steel has a section size of 330×2100mm, and the material of the slab is AB / EQ70.
[0074] The production method of the continuous casting slab of large-section cladding steel in this embodiment is as follows:
[0075] The molten steel is smelted in a converter, refined in an LF furnace, and then transferred to a VD furnace for vacuum deoxidation and degassing. After the vacuum is completed, 2.5kg / t of calcium wire is fed into the steel for final deoxidation and inclusion denaturation, and softening before casting. After blowing for 11 minutes, T[Ca] / [Al]s is 0.12, which promotes the floating of inclusions. The aluminum content in molten steel is 0.033%, the gas and impurity element content is: T[N]: 35ppm, T[O]: 15ppm, T[H]: 1.5ppm, T[S]: 0.002%, T[P] : 0.005%.
[0076] The molten steel is cast into the tundish at 1580°C, and the superheat of the tundish is 60°C. During continuous casting and c...
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