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Damage Mechanism of Converter Lining (1)

[2020-10-10]

The damage mechanism of the converter lining is very complicated. Generally speaking, under the combined action of physical, chemical and thermal stress, the oxygen converter lining will cause mechanical wear, erosion, erosion and thermal spalling, which will eventually lead to the damage of the lining. Because the working conditions of each part of the converter lining are very different, the damage of each part of the converter lining is different.

Furnace mouth and furnace cap: Mainly affected by high-temperature furnace gas scouring, slag splashing, often accompanied by slag and metal, and mechanical impact when cleaning the attachments, so the refractory bricks in this part require high thermal shock resistance Resistance and slag resistance, resistance to scouring slag and high temperature furnace gas, and require refractory materials not easy to stick to steel and easy to clean. Magnesia carbon bricks with high high temperature and high strength are mostly used in this part.

The charging side of the furnace lining: In addition to being corroded by molten steel and slag, it is also strongly impacted by scrap steel and strongly washed by molten iron during charging, and this effect is very serious. Therefore, the masonry refractories on the charging side of the converter require high-temperature strength, good thermal shock resistance, and high slag resistance. Therefore, most of the MgO-C bricks with high corrosion resistance and high thermal shock resistance are used in this area.

The tapping side of the furnace lining: it is less affected by thermal shock, but is affected by the thermal erosion of molten steel. The refractory material of the same level as the charging side can be used, and the thickness can be slightly thinner.

The trunnion parts on both sides: In addition to being corroded by molten steel and slag during the blowing process, it is also eroded and oxidized by airflow. The surface is not covered by a slag layer. Therefore, the carbon in the lining brick is easily oxidized. It is not easy to repair, so the erosion is serious, and magnesia carbon bricks with high oxidation resistance and slightly higher carbon content should be used for masonry.

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