Production method for producing low-carbon low-silicon and aluminum-containing steel through short process

Abstract

The invention belongs to the field of metallurgy processes and particularly relates to a p roduction method for producing low-carbon low-silicon and aluminum-containing steel through a short process. The low-carbon low-silicon and aluminum-containing steel is composed of, by weight, 0.04-0.06% of C, 0-0.03% of Si, 0.15-0.25% of Mn, 0-0.02% of P, 0-0.015% of S, 0.015%-0.050% of Als and the balance Fe and inevitable impurities. An LF link is omitted, the problem of silicon reversion caused by LF process treatment for reducing slag is solved under the condition that the purity of molten steel is not influenced, so that the target rate of Si content in the low-carbon low-silicon and aluminum-containing steel is increased, and the product yield is increased; and through CAS station strong deoxidation, the molten steel is completely deoxidized in short time, the molten steel castability is improved, sprue flocculating flow is reduced, and mass stable continuous casting production of the low-carbon low-silicon and aluminum-containing steel is achieved.

Description

technical field [0001] The invention belongs to the field of metallurgical technology, and in particular relates to a production method of short-flow low-carbon, low-silicon and aluminum-containing steel. Background technique [0002] Low-carbon, low-silicon and aluminum-containing steel requires that the weight percentage of C in the finished steel is ≤ 0.06%, and the weight percentage of Si is ≤ 0.03%. At present, according to the traditional smelting process, that is, the KR-BOF-CAS-LF-CCM process is used to produce, the Si content in the molten steel composition is difficult to control, the product yield is low, and the production cost is high. [0003] Due to the carbon in the molten steel composition, the free oxygen content in the molten steel at the end of converter smelting is relatively high. Generally, the weight percentage of oxygen in molten steel is ≥ 500ppm. During the smelting process, a large amount of Al 2 o 3 Inclusions, resulting in high content of incl...

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Problems solved by technology

[0003] Due to the carbon in the molten steel composition, the free oxygen content in the molten steel at the end of converter smelting is relatively high. Generally, the weight percentage of oxygen in molten steel is ≥ 500ppm. During the smelting process, a large amount of Al 2 o 3 Inclusions, resulting in high content of inclusions in molten steel, resulting in nozzle flocculation during the continuous casting process, resulting in the shutdown of the continuous casting machine, which seriously affects the continuity of continuous casting production