RH refining system and production method of ultra-low carbon steel

Abstract

The invention particularly relates to an RH refining system and production method of ultra-low carbon steel, and belongs to the technical field of steel smelting. The RH refining system comprises a refining furnace, a vacuum tank and a vacuum pipeline, wherein the refining furnace, the vacuum tank and the vacuum pipeline communicate in sequence; the vacuum pipeline is provided with a vacuum main valve and a waste gas analyzer; and the waste gas analyzer is arranged at the rear end of the vacuum main valve in the airflow direction and used for detecting the content of CO and CO2 in waste gas in the molten steel decarburization process. According to the RH refining system and production method of the ultra-low carbon steel, a detection point is transferred to the position near the vacuum main valve, the problems that the detection is delayed and disturbed by steam are solved, the carbon content in the decarburization process and in molten steel are accurately reflected in time, the decarburization operation in the RH smelting of the ultra-low carbon steel can be accurately guided, it is ensured that the carbon element in the molten steel is qualified and the decarburization time is optimal, the cost is optimal, the traditional process of controlling the decarburization time according to empirical values is replaced, the decarburization time is scientifically and effectively optimized, the smelting rate of ultra-low carbon is improved, the vacuum smelting time of the ultra-low carbon is shortened, the production cost is obviously reduced, and the production efficiency is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to an RH refining system and production method of ultra-low carbon steel. Background technique [0002] At present, the difficulty of smelting ultra-low carbon steel is the stable control of carbon elements. The decarburization time of major domestic steel mills is mainly based on the production data statistics. The carbon content at the end of decarburization meets the maximum decarburization time set by the requirements, and there is a phenomenon of time waste. There is room for shortening. Moreover, there are abnormalities in the decarburization process that cannot be effectively monitored, and there is a hidden danger of high C after decarburization. [0003] In order to effectively monitor the decarburization efficiency and the carbon element in molten steel, many steel mills also use exhaust gas analyzers to detect the CO value in the exhaust gas t...

AI Technical Summary

Problems solved by technology

[0002] At present, the difficulty of smelting ultra-low carbon steel is the stable control of carbon elements. The decarburization time of major domestic steel mills is mainly based on production data statistics. The carbon content at the end of decarburization meets the requirements. The maximum decarburization time set, there is a phenomenon of time waste, there is room for shortening

And there are abnormalities in the decarburization process that cannot be effectively monitored, and there is a hidden danger of high C after decarburization

[0003] In order to effectively monitor the decarburization efficiency and the carbon element in molten steel, many steel mills also use exhaust gas analyzers to detect the CO value in the exhaust gas to reflect the degree of decarburization , but most of the exhaust gas analyzers are installed at the end of the vacuum system, the CO value detection is seriously lagging behind and there is a large amount of steam at the end of the vacuum system, the detection accuracy of the exhaust gas analyzer is greatly reduced, so the traditional exhaust gas analyzer detection method cannot timely and accurately predict the exhaust Carbon level and carbon content in molten steel

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