Process for removing non-metallic inclusions in molten steel
A technology of non-metallic inclusions and molten steel, applied in the process of removing inclusions in molten steel, and the process of removing non-metallic inclusions in molten steel, can solve the problem of rapid diffusion of Ca in the feed steel, which cannot be realized The inclusions are fully floating, the continuous casting stopper is severely eroded, etc., and the process is easy to control, less investment, and the total amount is reduced.
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Embodiment 1
[0033] The specific implementation process is to produce 10 furnaces in a single casting time, and adopt the process route of "converter-LF refining-continuous casting" to produce high-grade hot-rolled steel.
[0034] 300 tons of top-bottom double-blowing converter steelmaking, the actual control data of ladle bottom-blowing argon gas agitation after tapping is shown in Table 1; then the secondary refining treatment in LF furnace is carried out, and the components included in the ladle top slag after refining are shown in Table 2 Show. At the end of refining, soft blowing is performed once, and after soft blowing, silicon-calcium wire with a diameter of Φ13mm is fed. After the wire is fed, soft blowing is performed for the second time, and full protection casting is carried out after soft blowing. The specific process parameters of two soft blowing and wire feeding are shown in Table 3. See Table 4 and Table 5 for the actual control of molten steel composition during the two ...
Embodiment 2
[0048] 11 furnaces of hot-rolled steel grades are produced in a single cast, and high-grade hot-rolled steel grades are produced using the 'converter-RH refining-continuous casting' process route.
[0049] The top slag is modified during the tapping process of the 300-ton top-bottom double-blowing converter. The ingredients included are shown in Table 7. At the end of refining, soft blowing is performed once, and after soft blowing, silicon-calcium wire with a diameter of Φ13mm is fed. After the wire is fed, soft blowing is performed for the second time, and full protection casting is carried out after soft blowing. The specific process parameters of the two soft blowing and wire feeding are shown in Table 8. See Table 9 and Table 10 for the actual control of molten steel composition during the two soft blowing and silicon-calcium wire feeding processes.
[0050] Table 6 Ladle stirring after tapping
[0051]
[0052] Table 7 Final composition of ladle top slag
[0053] ...
Embodiment 3
[0062] 12 furnaces of hot-rolled steel are produced in a single cast, and high-grade hot-rolled steel is produced using the process route of 'converter-LF refining-RH refining-continuous casting'.
[0063] 300 tons of top-bottom double-blowing converter steelmaking, the actual control data of ladle bottom-blowing argon gas stirring after tapping is shown in Table 11, and then the LF furnace refining treatment is carried out, and then the RH vacuum refining treatment is carried out. After refining, the ladle top slag includes The composition is shown in Table 12. After the RH breaks the vacuum, it starts to perform a soft blowing. After the soft blowing, feed the silicon-calcium wire with a diameter of Φ13mm. After feeding the wire, perform a second soft blowing. After the soft blowing, perform full protection casting. The specific process parameters of the two soft blowing and wire feeding are shown in Table 13. See Table 14 and Table 15 for the actual control of molten steel...
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