In response to the current common problems in the material of the converter skateboard, RS Refractory is based on the actual production conditions of the steel plant, and continuously optimizes the skateboard material to improve the overall performance of the skateboard such as oxidation resistance, wear resistance, thermal shock stability, and corrosion resistance. Developed magnesium-carbon, aluminum-carbon, aluminum-zirconium-carbon, aluminum-zirconium-carbon inlaid zirconium and other materials, and finally adopted aluminum-zirconium-carbon body composite zirconium inlay ring technology, which greatly improved the overall service life of the skateboard and the average life From the original 10~16 furnaces to 23~25 furnaces, the maximum life is up to 27 furnaces, which is at the leading domestic level.
Measures to improve the overall life of the tapping port During the converter tapping process, the molten steel passes through the tapping port to the ladle. The refractory material of the tapping port is gradually melted under the washing of the high-temperature flowing molten steel, making the inner hole of the tapping port appear "inverted horn" Small mouth and big mouth)” reaming. Since the tap hole is assembled by the set of bricks and the end brick (C brick) as a whole, the tap hole C brick cannot be replaced separately in actual use. After using the 90-110 furnace, even if the inner nozzle brick is replaced again , Because the tap hole C brick "expansion" is too large to ensure the safe combination area with the inner nozzle brick, there will be a very high risk of molten steel leakage at the joint surface. At this time, the entire tap hole must be replaced immediately, and the converter The other sets of bricks at the taphole of the package wall can continue to be used.
The resulting problem is that the comprehensive life of the taphole is greatly reduced, which not only increases the frequency of taphole replacement, affects the normal production organization and production capacity, but also increases the cost of using refractory materials for the taphole. The new design changes the C brick of the overall structure to a combinable structure, and adopts a replaceable body (bowl brick) that can be replaced individually in the "reaming area". The tap hole C brick with a new structure is adopted. When the tap hole C brick is "expanded" to be too large to ensure a safe combination area with the inner nozzle brick, a bowl of bricks that replace the tap hole C bricks separately are used. Ensure the safe combination area of the taphole C brick and the inner nozzle brick, and realize the continuous improvement of the taphole life, the increase rate is 20%~40%. This effectively improves the on-line service life of the tapping hole, from about 90-110 furnaces to 120-140 furnaces, and greatly improves the safety factor of steel pouring at this location.
