Designing the future of steel ladle refractories

Source: | Author:ChangXing Refractory | Published time: 1599 days ago | 1007 Views | Share:

In short, the ladle is a container that can store and transport molten steel during the smelting process. Nowadays, due to the rapid development of the manufacturing industry, the manufacture of some important equipment and instruments requires the continuous improvement of the quality of steel. This requires improving the purity of steel, removing inclusions in molten steel, and strictly controlling the composition of some harmful elements in molten steel. The refining process in the ladle can meet these requirements, so the refining process in the ladle has become a way to improve the quality of steel. The ladle has changed from a simple molten steel container to a multi-element container with smelting function. The structural composition of the ladle is mainly composed of three parts: the outer shell, the inner lining and the mainstream control mechanism.

The ladle shell is welded by the boiler steel plate. The thickness of the steel plate on the wall and bottom of the barrel is between 14-30mm and 24-40mm. In order to ensure the smooth removal of baking moisture, a small hole of 8-10mm is drilled in the ladle shell.

The inner lining of the ladle is mainly composed of three parts, The first part is the working layer. The working layer is in direct contact with molten steel and steel slag during ladle smelting. It is eroded by molten steel and steel slag, and is susceptible to large temperature differences. Therefore, the refractory materials used in the working layer are often damaged seriously and require regular inspection and testing replace;

The second part is the permanent layer with a thickness of about 30-60mm. The permanent layer is inside the working layer. The permanent layer plays the role of the main skeleton of the ladle. It plays a vital role in preventing the leakage of molten steel and maintaining the safe operation of the ladle. The life span is related to the quality of this layer. This layer is generally built with clay and high-alumina bricks, usually in a comprehensive way.

The third is the insulation layer. The insulation layer is the outermost layer of the inner lining, which is close to the steel plate and has a thickness of about 11-15mm. Steel energy consumption. The opening of the sliding nozzle of the ladle is used to control the flow rate of molten steel and the height of the liquid level of the tundish.

The sliding nozzle consists of upper nozzle, upper slide, a lower nozzle and a lower slide. During operation, the movement of the lower sliding plate can be used to control the coincidence of the upper and lower injection holes of section a to control the size of the flow. There are two adjustment methods, namely hydraulic and manual. Because the sliding nozzle has to withstand the erosion of high-temperature steel slag, the static pressure of the molten steel, and the effects of rapid cooling and rapid heating, the refractory materials are required to be resistant to high temperature, erosion, rapid cooling and rapid heating, and good slag resistance, and have sufficient high temperature strength.