Refractory material for BOF steelmaking

Source: | Author:ChangXing Refractory | Published time: 1606 days ago | 1130 Views | Share:

Converter steelmaking is currently the main steelmaking method, and about 65% of the world's steel is converter steel. Our country is currently dominated by converter steel.
As far as the entire converter lining is concerned, high-temperature slag erosion is the main cause of damage to the refractory lining. The hearth is also the weak link of the converter. The parts where refractory materials are seriously damaged are: the charging side, the slag line and the trunnion.

The loading side not only receives the erosion and erosion of molten steel and slag, but also is directly impacted and eroded by scrap steel and molten iron. The combined effect of slag erosion and impact has worsened the damage to the refractory lining of this part. Generally, products with high slag resistance and high temperature strength are used, such as high-purity magnesia dolomite bricks, various high-quality magnesia bricks, and magnesia carbon bricks.

The slag line is mainly slag corrosion, which is relatively light on the tapping side, and the slag discharge side is more damaged. Therefore, refractories are required to have good slag resistance. At present, high-quality MgO-C bricks and MgO-CaO-C bricks are mostly used.

In addition to other causes of damage, the trunnion part is also affected by serious mechanical stress, and there is less slag discharge at this part, refractory materials are not protected, and the carbon-containing lining is easily oxidized. At present, more high-strength MgO-C brick are used in this part.