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High-efficiency RH decarburization method

A high-efficiency, decarburization technology, applied in the field of steelmaking, can solve the problem of low RH decarburization efficiency, and achieve the effect of improving decarburization efficiency, reducing costs, and increasing decarburization rate

Active Publication Date: 2021-09-14
BEIJING SHOUGANG CO LTD
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Problems solved by technology

[0003] In order to solve the technical problem of low RH decarburization efficiency, the present invention provides a high-efficiency RH decarburization method. Compared with the existing RH decarburization process, this method can effectively shorten the RH refining vacuum cycle, improve efficiency, reduce cost purpose

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Embodiment

[0068] A high-efficiency RH decarburization method in this embodiment comprises the following steps:

[0069] (1) In the early stage of RH decarburization, when the gas pressure in the vacuum chamber is measured to be ≤3.9KPa, the height of the liquid steel level in the vacuum chamber is controlled at 50-150mm, and argon gas with a flow rate of 2000NL / min is blown in to carry out the decarburization reaction , and the duration is 9 minutes.

[0070] (2) When the mass fraction of carbon in the molten steel drops to 100ppm, raise the molten steel level in the vacuum chamber to 400mm, and mix oxygen into the argon gas, and continue the reaction for 5 minutes;

[0071] In the mixed gas composed of argon and oxygen, the volume fraction of the oxygen is 5-50%, and the flow rate of the mixed gas is 2400-3200 NL / min.

[0072] (3) and / or: carbonic acid substances are blown into the molten steel through the circulation holes of the dipping tube, and the carbonic acid substances include...

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Abstract

The invention provides a high-efficiency RH decarburization method, which belongs to the technical field of steelmaking. The high-efficiency RH decarburization method comprises the following steps that the liquid level height of molten steel in a vacuum chamber is controlled to be 50-150mm in the early stage of RH decarburization, and RH circulating gas is blown to carry out decarburization reaction; when the mass fraction of carbon in the molten steel is reduced to 50-100 ppm, the liquid level height of the molten steel in the vacuum chamber is increased; oxygen is mixed into RH circulating gas and / or carbonic acid substances are blown into the molten steel; and after the mass fraction of the carbon in the molten steel is reduced to a target value, the RH decarburization is finished. Compared with an existing RH decarburization process, the method can effectively shorten an RH refining vacuum period, and purposes of improving efficiency and reducing cost are achieved.

Description

technical field [0001] The invention belongs to the technical field of steelmaking, and in particular relates to a high-efficiency RH decarburization method. Background technique [0002] With the development of the steel industry, efficiency has become more and more important, and the long vacuum cycle for producing ultra-low carbon steel is an important factor restricting the further shortening of the refining cycle. Various companies use different technological measures to increase the RH decarburization rate, thereby shortening the vacuum cycle. At present, the main focus is to change the shape and inner diameter of the RH refining dip tube, and change the cycle gas to CO 2 , Increase the vacuum decarburization rate by increasing the side blowing at the bottom of the vacuum chamber, the bottom blowing of the ladle, etc., but these methods have a limited effect on improving the decarburization rate of RH, and it is difficult to meet the needs of efficient decarburization...

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Application Information

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IPC IPC(8): C21C7/068C21C7/10
CPCC21C7/068C21C7/10Y02P10/20
Inventor 孙亮毕泽阳刘风刚刘珍童冀建立杨晓艳李锐
Owner BEIJING SHOUGANG CO LTD
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