Converters are a type of commonly used steelmaking furnace. They are generally tiltable cylindrical oxygen-blowing steelmaking containers. The furnace body is cylindrical, mounted on a horizontal axis frame, and can be rotated for steelmaking. Since the working conditions of various parts of the converter vary greatly, the damage to each lining is different. Therefore, magnesium carbon bricks with good high temperature resistance, strong slag resistance, good thermal shock resistance, and low high temperature creep are a perfect match for converters. The most commonly used refractory bricks in various parts of the converter are magnesium carbon bricks. Let's take a look at which parts of the converter lining need magnesium carbon bricks.
*Furnace mouth and furnace cap
The refractory bricks used in this part are required to have high thermal shock resistance and slag resistance, and can effectively resist the scouring from high temperature furnace gas and the splashing of the furnace. Therefore, magnesium carbon bricks with high temperature resistance and high strength are mainly used.
*Charging side of the lining
The charging side of the converter requires that the refractory bricks have high high temperature strength, good thermal shock resistance, and high slag resistance. Therefore, the magnesia carbon bricks with high corrosion resistance and high thermal shock resistance are mostly used in this area.
*The trunnions on both sides
In addition to being eroded by molten steel and slag during the blowing process, they are also eroded and oxidized by airflow. There is no slag layer covering the surface, so the carbon in the lining bricks is easily oxidized. In addition, it is not easy to repair after damage, and the erosion is serious. Magnesia carbon bricks with high oxidation resistance and high carbon content should be used for masonry.
*Slag line area
Since this area has been in contact with slag for a long time, it is a serious area eroded by slag. In addition, the other effects suffered by the converter belly during the blowing process, so this area is severely eroded. Therefore, refractory bricks with high corrosion resistance should be selected.
*Molten pool part
Although it is eroded by molten steel during the blowing process, the damage is less severe than other parts, and the slag splashing operation of the converter often causes the bottom of the converter to rise, so ordinary magnesia carbon bricks can be used for the molten pool part of the converter.
*Furnace hearth and furnace bottom
These parts are violently eroded by molten steel during blowing, but the damage rate is lower than other parts, and magnesia carbon bricks with low carbon content can be selected.
*Steel outlet part
The steel outlet is eroded and eroded by high-temperature molten steel and slag, as well as the influence of rapid temperature changes, and the damage is more serious. Therefore, magnesia carbon bricks with good erosion resistance and high oxidation resistance should be built. Generally, integral magnesia carbon bricks or combined magnesia carbon bricks are used, and they need to be repaired or replaced after a certain number of uses.
HOME