A method for real-time online rapid determination of molten steel carbon in converter steelmaking

Abstract

The invention relates to a real-time, online and quick measurement method of carbon content in molten steel during converter steelmaking. The method comprises the following steps: during converter steelmaking, observing flame height at a stove mouth through a steelmaking mirror, using a sample scoop to scoop out molten steel, and observing height of jumped sparks in the molten steel to sequentially judge the carbon content in the molten steel. The method provided by the invention is low in cost and high in accuracy, can realize quick detection, can achieve real-time and online measurement of the carbon content in the molten steel with the accuracy rate of more than 99%, is short in measuring time and high in accuracy as compared with a conventional instrument, avoids the problem of unsmooth production pace due to long testing time, and has a relatively high use value in aspects of improving steel grade smelting yield, prolonging service lives of a converter and an oxygen lance, improving quality stability of products, reducing consumption of steel materials and the like.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a real-time and on-line method for rapidly and accurately measuring molten steel carbon in converter steelmaking. Background technique [0002] In the process of converter steelmaking, it is necessary to quickly and accurately measure the carbon of molten steel when tapping the steel, so as to improve the steel refining rate, converter life, oxygen lance life and product quality stability, and reduce the consumption of steel materials. At present, the competition in the iron and steel industry is fierce, and the smelting of variety steel is more and more valued by various iron and steel enterprises, and the rapid and accurate determination of molten steel carbon in small-scale converter steelmaking is one of the ways to improve the level of fast-paced production and smelting of variety steel. [0003] CN101592651A (CN200910158108.2) A method for measuring the carbon content of...

AI Technical Summary

Problems solved by technology

The deficiencies of the methods for detecting molten steel carbon in the above two patent documents are: 1. They are all judgments on the current carbon content of molten steel in the electric furnace steelmaking furnace, which is not applicable to converters; 2. The detection time is long, resulting in a long smelting cycle, which is harmful to molten steel Composition, molten steel quality and ladle life have a serious impact, and at the same time have a negative impact on the tight and fast production organization and increase in production capacity; and the detection cost is high

Its shortcomings: First, the molten steel is scooped out with a sample scoop, or the steel sample taken out with a sampler may not necessarily be representative due to sampling errors or slag problems; During the process, the molten steel is poured on the steel sheet, which is quickly cooled and then sent to the laboratory for testing, or the steel sample taken by the sampler is sent to the laboratory for testing after grinding, which takes a long time and cannot be judged at any time. The third is that when the shift is handed over, the laboratory needs to standardize the steel samples, which will delay the test results of at least a few heats of steel; the fourth is that when the laboratory conducts the test, the result will also cause an error of 0.01-0.02%C; It is to use a sampler to take samples, and it will cost 0.3 yuan / t to go to the laboratory or spectrum room for testing

Based on the above reasons, the current method of detecting carbon in molten steel results in a long smelting cycle, which has a serious impact on the composition of molten steel, the quality of molten steel and the life of the ladle, and has an adverse effect on the tight and fast production organization and the increase in production capacity.

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