Method for measuring content of dissolved elements in molten steel

Abstract

A method for measuring the content of dissolved elements in molten steel relates to the field of ferrous metallurgy chemical detection, and comprises the following steps: S1, a liquid molten steel sample to be measured is cooled to prepare a solid steel sample; S2, the solid steel sample is placed in an electrolyte for electrochemical corrosion, and the mass change delta msteel of the solid steel sample before and after electrochemical corrosion is measured; s3, non-metallic inclusions in the electrolyte after electrochemical corrosion are removed, and a to-be-detected element solution is obtained; S4, the mass mi of a dissolved element i in the to-be-detected element solution is measured; S5, the mass fraction of the dissolved element i in the liquid molten steel to be detected is obtained. The method utilizes electrochemical corrosion, filtration and other methods, elements in non-metallic inclusions in steel and dissolved elements in the steel are effectively separated, chemical analysis is conducted on the content of the dissolved elements in an electrochemical corrosion solution through ICP, and the measuring method is accurate in precision, the content of the dissolved elements in the steel can be effectively measured.

Description

technical field [0001] The invention relates to the field of iron and steel metallurgical chemical detection, in particular to a method for measuring the content of dissolved elements in molten steel. Background technique [0002] Alloy content is one of the important indicators of steel materials, which directly affects the quality of steel and product performance. Adding effective alloying elements to steel can effectively reduce the content of impurity oxygen elements in steel, modify non-metallic inclusions in steel, and improve the product performance of steel materials. Elements in steel materials include dissolved elements in molten steel and elements in non-metallic inclusions in steel, and the sum of the two is called the total element content. Among them, the content of dissolved elements can be applied to the thermodynamic prediction of the reaction between slag, steel and inclusions, and is an important parameter to realize the accurate calculation and predictio...

AI Technical Summary

Problems solved by technology

However, at present, my country can only measure and analyze the total element content in steel, and there is no effective method for measuring the content of dissolved elements in molten steel.

On the one hand, this is because the changes in the dissolved elements in the steel during the solidification and cooling process of the steel have been ignored, and a suitable cooling method has not been adopted for the sample; on the other hand, because both steel and non-metallic inclusions are easily dissolved in acid, no suitable Extraction method of dissolved elements in steel and elements in non-metallic inclusions

Previously, a patent proposed a measurement method for solid solution elements in steel by measuring the solid solution elements in a slowly cooled steel sample. However, the measurement method for solid solution elements did not take into account the slow solidification and cooling process of steel. The chemical reaction between the dissolved elements in the liquid and the non-metallic inclusions in the steel results in a change in the content of the elements remaining in the steel, which is different from the content of the dissolved elements in the initial liquid steel

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