Medium-frequency induction furnace

Abstract

The invention discloses a medium-frequency induction furnace which comprises a furnace shell, a furnace bottom and a furnace lining. The furnace bottom and the furnace lining are arranged inside the furnace shell. An induction ring is arranged on the outer wall of the furnace lining. A magnet yoke is arranged on the top of the induction ring. The furnace lining is made of aluminum-magnesium spinel materials. An air brick and a bottom leaky pipe are arranged at the bottom end of the furnace lining. A sealing ring is arranged at the upper end of the furnace lining. The sealing ring is composed of a heat insulation ring, a water-cooling ring and a metal sealing ring. The water-cooling ring and the metal sealing ring are both arranged inside the heat insulation ring. The water-cooling ring is located at the upper portion of the metal sealing ring. The heat insulation ring is made of electric fused white corundum materials. A vacuum cover is arranged at the upper portion of the sealing ring. The vacuum cover is connected with a vacuum pump. According to the medium-frequency induction furnace, vacuumization can be achieved, bottom argon blowing and stirring can also be achieved, the inner wall of the circumference of the upper portion of the furnace lining can be sealed through the sealing ring arranged at the upper portion of the furnace lining, the sealing performance of the medium-frequency induction furnace is enhanced, and therefore during the vacuumization, the vacuum degree can reach about 30KPa.

Description

technical field [0001] The invention relates to an intermediate frequency induction furnace. Background technique [0002] At present, the most advanced stainless steel refining and metallurgical technology at home and abroad is AOD-VCR, which can not only save a lot of argon and deoxidizing reducing agent, reduce the cost by ≥ 20%, but also refine ultra-pure stainless steel that cannot be produced by ordinary AOD methods. That is, C+N≤0.01%. Its core technology is to carry out 20-30KPa vacuum + bottom blowing argon stirring treatment on oxygen-rich stainless steel liquid with carbon content ≤0.10%, Si and Mn≤0.20%. Relying on dissolved oxygen and combined oxygen in slag to further decarburize, at the same time, the temperature of the molten pool drops by 50-70 °C. Practice has proved that by reducing the temperature of the molten pool, the service capacity of the furnace lining can be increased by 30%. However, due to the poor sealing effect of the upper part of the lining...

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Problems solved by technology

[0003] The object of the present invention is to address the above problems and provide an intermediate frequency induction furnace to solve the problems of poor sealing effect of the furnace mouth and strong magnetic induction of the existing intermediate frequency induction furnace, resulting in poor vacuuming effect and overall serviceability of the intermediate frequency induction furnace bad question

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