Tapping Deoxidation Process of Semi-steel under High-draw Carbon Condition

Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to an output steel deoxidizing process under the semisteel catching carbon practice condition. The process includes the steps that when the percentage mass content of carbon in molten steel at the end point of a converter is larger than or equal to 0.10% and smaller than 0.20%, carburant is added for preliminary deoxidization when steel is output by one third; a deoxidizing agent is added for thorough deoxidization on a blowing-argon-behind-converter platform after steel is completely output; when the percentage mass content of carbon in molten steel at the end point of the converter is larger than or equal to 0.20%, the output steel is not deoxidized, the deoxidizing agent is directly added for oxygen determination on the blowing-argon-behind-converter platform, the deoxidizing agent is added according to the oxygen determination value, and argon is blown to ladle bottoms when and after steel is output. By means of the process, deoxidization material consumption can be lowered, production cost can be reduced, and meanwhile the nitrogen increase volume in the steel output process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a semi-steel-making converter tapping deoxidation process. Background technique [0002] The study found that the control of the end point carbon in iron and steel smelting is closely related to the consumption of steel materials and alloy materials. There are two methods for the end point control of converter steelmaking. Carburizing agent is added to carburize molten steel. The carburization method can ensure a lower phosphorus content in the final molten steel, but the slag is highly oxidizable and corrodes the furnace lining, and the oxygen activity of the molten steel is high. Increasing the amount of deoxidizer also reduces the alloy yield, and a large amount of carburization is added to the ladle after tapping The composition fluctuates greatly; another method is the high-drawing carbon blowing method. The so-called "high-drawing carbon method" means that t...

AI Technical Summary

Problems solved by technology

However, the article does not involve the specific deoxidation process of converter smelting high carbon steel

[0005] At present, due to the low carbon content (3.4%-4.0%) in the semi-steel obtained by desulfurization and vanadium extraction in most steelmaking enterprises, the content of silicon and manganese in the semi-steel is traces of heat-generating slag elements, and the semi-steel smelting Most of the time slagging is made by adding acidic slagging materials, so that the heat source in the smelting process is seriously insufficient, and only through semi-steel heat compensation to achieve high-drawing carbon tapping, which increases the cost

Moreover, nitrogen entering the steel during the steelmaking process will become a harmful element in most cases. High nitrogen content in the steel will reduce the formability, welding performance, high temperature toughness and plasticity of the steel, and at the same time increase the aging and cold brittleness of the steel. In addition, nitrogen It will also cause cracking of the billet