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Method for measuring content of dissolved elements in molten steel

A technology of element content and measurement method, applied in the preparation of test samples, thermal excitation analysis, material excitation analysis, etc., can solve the problems of unconsidered, different, element content change, etc., to achieve accurate accuracy, prevent loss, and effectively measure Effect

Active Publication Date: 2021-07-30
UNIV OF SCI & TECH BEIJING +2
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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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  • Method for measuring content of dissolved elements in molten steel

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Embodiment

[0043]Embodiment: (steel sample chemical composition (mass percentage): C 0.998%, Si 0.201%, Mn 0.359% Cr1.44%, S 0.003%, Al 0.0149%, T.Mg 0.0003%, T.Ca 0.0011%, T.O 0.0008%, the rest is Fe, of which the dissolved calcium content is 0.00015%, T.Mg, T.Ca, T.O represent the total magnesium, total calcium and total oxygen content in the steel respectively)

[0044] Such as figure 1 As shown, after sampling molten steel at 1600°C, it was rapidly cooled to room temperature at a rate of 50°C / min, and the steel sample was processed into a round bar with a diameter of 11mm and a height of 110mm, and weighed; with 250ml triethanolamine, glycerol, The methanol solution of tetramethylammonium chloride and acetylacetone is an electrochemical corrosion solution, wherein the mass percentage of triethanolamine is 3%, the mass percentage of glycerin is 3%, and the mass percentage of tetramethylammonium chloride The mass percentage of acetylacetone is 1%; the dissolved calcium in the weighed ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N21/73
CPCG01N1/28G01N21/73Y02P10/20
Inventor 任英张立峰杨文刘建勋陈列董贵文熊洪进王瑞王强任强段豪剑高小勇
Owner UNIV OF SCI & TECH BEIJING
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