Molten steel composition sensor and its application progress 1. Introduction Using computer control algorithms to optimize industrial processes requires real-time process parameters. The degree to which a process is optimized depends on the quantity and quality of process information, so the development of advanced sensors can improve the control level of the process. The most important parameter in the steelmaking process is the chemical composition of the molten metal. Molten steel in contact with the atmosphere will increase the content of oxygen, nitrogen, hydrogen and other elements in it; sometimes some elements will reduce their content in steel when they interact with refractory materials or the atmosphere, which will affect the quality of steel. If the real-time information of the chemical composition of the molten steel is known, the steelmaking process can be actively controlled. For this reason, people have developed various sensors for the determination of the chemical composition of molten steel. The dissolved gases oxygen, nitrogen and hydrogen in steel are important factors affecting the quality of steel. In recent years, the joint control of oxygen, nitrogen and hydrogen in steel has become increasingly important. Problems such as pinholes and bubble hydrogen-induced cracking are not entirely caused by one gas. The most effective method is to detect the concentration of these gases in steel during the process. Silicon and sulfur are the elements of the \"three removals\" of molten iron pretreatment. With the increase in the proportion of molten iron pretreatment in my country, the control of the molten iron pretreatment process has become more and more urgent. This article introduces the latest progress in online detection technology for these five elements.
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