Production method of low-carbon low-silicon cold heading steel
A production method, a low-carbon and low-silicon technology, applied in the field of metallurgy, can solve the problems of high output products such as connecting billets, unstable control of the pouring furnace, and fluctuations in the liquid level of the crystallizer, etc., and achieve good promotion and application value and effect Stable and significant, the effect of solving liquid level fluctuations
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Embodiment 1
[0015] Embodiment 1: Production of steel type C4C~Q
[0016] The chemical composition requirements of steel grade C4C are shown in Table 1.
[0017] (1) Converter: The end point of the converter is C=0.03, 2.70 kg / t of lime is added for tapping, and 2.45 kg / t of manganese alloy is added. Add 3.0kg / t of aluminum and iron after the molten steel is discharged, and feed 1.5m / t of aluminum wire after the furnace. Outbound Al=0.025, Si=0.004.
[0018] (2) LF furnace: Lime, low-silicon and high-aluminum pre-melted slag, and aluminum shot are used for slagging, the white slag retention time is 31min, the total slag amount is 22.9kg / t steel, and the Al content in the molten steel smelting process is 0.022, 0.035, 0.038, Multiple batches of small amounts of aluminum shot 1.0kg / t steel are fed, aluminum wire is supplemented before leaving the station to molten steel Al=0.068, molten steel Si=0.027 when leaving the station, and pure calcium wire is fed 1.6m / t steel when leaving the stat...
Embodiment 2
[0022] Embodiment 2: Production of steel type XSWRCH08A~Q
[0023] The chemical composition requirements of steel grades XSWRCH08A~Q are shown in Table 1. Process steps include:
[0024] (1) Converter: The end point of the converter is C=0.05, 2.82 kg / t of lime is added for tapping, and 3.38 kg / t of manganese alloy is added. Add 2.72kg / t of aluminum and iron after the molten steel is discharged, and feed 1.5m / t of aluminum wire after the furnace. Outbound Al=0.031, Si=0.007.
[0025] (2) LF furnace: Lime, low-silicon and high-aluminum pre-melted slag and aluminum shot are used for slagging, the white slag retention time is 28min, the total slag amount is 19.2kg / t steel, and the Al content in the molten steel smelting process is 0.023, 0.029, 0.032, Multiple batches of small amounts of aluminum shot 0.9kg / t steel are fed, aluminum wire is fed to molten steel Al=0.058 before leaving the station, molten steel Si=0.036 when leaving the station, and pure calcium wire is fed 1.6m...
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