Burning type oxidation-proof guard circle for pouring molten steel and preparation method thereof

Abstract

The invention discloses a combustion type anti-oxidation protective ring used for casting liquid steel as well as a preparation method thereof. The protective ring is a ring made of combustible material, and the ring is infiltrated with combustible organics. The ring is braided by dry rice straw. The best combustible organics is paraffin. The preparation method of the protective ring comprises two main steps: the preparation of the ring and waxing. When in use, the protective ring is positioned above a central casting pipe and aligned with a ladle nozzle. The ring is combusted under the high temperature of the liquid steel when steel stream flows through the ring. Oxygen near the steel stream is consumed by combustion, therefore, oxygen partial pressure can be lowed effectively, and the infiltration and dissolution of oxygen in the air into the liquid steel to the utmost extent is reduced.

Description

Technical field: [0001] The invention relates to a process device for improving pouring quality during molten steel pouring, which belongs to the field of metal smelting, in particular to a combustion-type anti-oxidation protective ring, and also provides a preparation method for the protective ring. Background technique: [0002] With the advancement of steelmaking technology, the record of low impurity content in molten steel has been refreshed again and again, and molten steel has become cleaner and cleaner. The primary inclusions produced by the deoxidation reaction in the steelmaking process have been controlled at a very low level, which is the result of the application of secondary refining technology. Then people began to turn their attention to the secondary oxidation prevention of molten steel. The secondary oxidation of molten steel means that when the deoxidized molten steel comes into contact with the atmosphere, slag, refractory materials, etc., it reacts to f...

AI Technical Summary

Problems solved by technology

Chinese patent 200620128477.9 (disclosure date: December 5, 2007) discloses an "argon seal protection pouring sealing ring". Or reduce the secondary oxidation of molten steel with oxygen and nitrogen in the atmosphere during the pouring process, and improve the product qualification rate. Compared with vacuum equipment, the investment of this patented product is small, but the structure is still relatively complicated, and argon gas input is also required. , the molten steel splashed at high temperature may cause the vent holes to be blocked

However, considering factors such as cost and operation, many domestic iron and steel enterprises are still open when pouring steel ingots, which has become a bottleneck restricting the further improvement of steel quality

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