Double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions

Abstract

The invention provides a double-tube type electromagnetic induction RH device and method for heating molten steel and removing inclusions. The device comprises a steel ladle, a vacuum chamber, an ascending pipe, a descending pipe, an iron core and an induction coil, wherein the ascending pipe and the descending pipe are arranged at the bottom of the vacuum chamber, lower ports of the ascending pipe and the descending pipe are communicated with the steel ladle, and the iron core is of a solid structure and is arranged in the manner of surrounding the ascending pipe or the descending pipe; and parts, close to the outer side of the ascending pipe or the outer side of the descending pipe, of the iron core are wound with the coil, and the axis of the coil keeps to be perpendicular to the axis of the ascending pipe or the descending pipe. The method includes the process steps that (1) the molten steel generates circulation motion in the vacuum chamber, the ascending pipe and the descending pipe according to the airlift pump principle; (2) a forced air cooling or water cooling device is started, alternating current is led into the induction coil, and the inclusions are continuously removed; and (3) after the temperature of the molten steel rises to the temperature which is 10 DEG C to 300 DEG C higher than the liquid phase line, electrification is stopped, the forced air cooling or water cooling device is stopped, and the molten steel is led into a next working procedure.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a double-tube electromagnetic induction RH device and method for heating molten steel and removing inclusions. Background technique [0002] The large demand for steel in the market has promoted the development and improvement of ultra-low carbon steel production technology, and the most critical production process and technical points are the development and application of secondary refining technology for ultra-pure steel such as ultra-low carbon steel. Among the many existing refining technologies outside the furnace, the RH vacuum refining technology has been adopted by most steel companies in the world due to its good refining effect, short processing cycle, strong adaptability, and large processing capacity, and has become a secondary furnace refining technology. The mainstream of refining technology. [0003] The principle of the RH equipment...

AI Technical Summary

Problems solved by technology

On the one hand, the main function of traditional RH is vacuum decarburization. For inclusions, its removal rate is not particularly obvious. At the same time, in the later stage of the heating process of aluminum addition, a large amount of Al2O3 inclusions will be produced, which will affect the purity of molten steel.

On the other hand, in the early stage of RH vacuum decarburization, LF furnace and CAS-OB are used to heat molten steel, which involves many links, time-consuming and energy-consuming, and the operation process is relatively complicated.

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