Precautions for anti-seepage purging plug

Out-of-furnace refining has become an important part of the modern steelmaking process, and argon blowing at the bottom of the ladle is an important part of out-of-furnace refining. The ladle purging plug are the key components to complete this process, and steelmaking manufacturers pay special attention to it. A good breathable brick should have the characteristics of long service life, good bottom blowing effect, no (less) purging, safety and reliability. Today's purging plug mainly include slit type and anti-seepage type. The width and distribution pattern of the slits of the slit-type purging plug must be reasonably planned based on the steel ladle capacity, smelting steel type and required air permeability, so the production process is more complicated; the anti-seepage purging plug are controlled by the particle size ratio of the ingredients. To produce many irregularly distributed through pores, the production process is relatively simple.

Anti-seepage purging plug adopt a structure that combines a breathable inner core with fine high-strength materials: the working range of the brick core is part of an anti-seepage design, and the installation equipment adopts a slit design. When a slit gas channel is observed, it means that it is breathable. The remaining brick height is insufficient and purging plug need to be replaced.

During the transportation and installation of purging plug, it is necessary to ensure that the threads of the tail steel pipe are not damaged to avoid loose pipe connections and air leakage, which will affect the argon blowing flow rate and blowing rate; ensure that dust and debris are not entered into the tail steel pipes; ensure that the purging plug The working surface should not be covered by fire clay or other materials to avoid failure of bottom blowing. During installation or use, ensure that the pipe connections are tight and air-tight, otherwise the argon gas pressure will be insufficient, affecting the stirring effect and resulting in a decrease in the blow-through rate.

When the alloy is added too early when tapping the converter, and the molten steel level in the ladle is too low, the melting point of the low and highly permeable alloy will easily lead to poor air permeability of the brick core. In addition, adding alloy too early will result in a lower temperature at the bottom of the ladle; if the argon blowing operation is not standardized and the argon gas is not turned on in time for stirring after tapping, it will easily lead to difficulty in blowing in the early stage of refining.

Severe crusting at the bottom of the ladle, a large number of online ladle turnovers, timely dumping of slag after steel pouring, failure to purge the purging plug during hot repairs, long thermal shutdown time of the ladle, and lower tapping temperature of the molten steel can easily lead to the appearance of the brick core. There is residual molten steel and steel slag, and the surface is easy to crust and affects the ventilation function.