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In steelmaking production, using aluminum for deoxidation can effectively reduce the oxygen content, minimize the formation of bubbles due to the carbon-oxygen reaction, and at the same time refine the grain structure of the steel, thereby improving the impact toughness of the steel, reducing cold brittleness and aging tendency. Since the specific gravity of aluminum (2.7g/cm) is much lower than that of molten steel (7.6g/cm3) and steel slag (about 3.59/cm3), and it is extremely easy to oxidize in air and steel slag. Especially when used for deoxidation in converter steelmaking, aluminum floats on the surface of the molten steel, resulting in large burning losses and low recovery rates. Therefore, in actual production, deoxidizers containing aluminum are often used for deoxidation. They have the characteristics of easily penetrating the steel slag layer, having a high melting point of about 1280℃, being difficult to melt in the steel slag layer, and being able to reach the deep layer of the molten steel for melting and deoxidation. When used for deoxidation and alloying of molten steel, its density is between that of molten steel and steel slag, which can effectively improve the utilization rate of aluminum. In addition to the low carbon content playing a good role in suppressing the carbon increase in molten steel, aluminum cakes are convenient for storage and can be added using a hopper, which not only simplifies the process of deoxidation and alloying of molten steel but also reduces the labor intensity of workers.
Metallic aluminum is a commonly used deoxidizer for molten steel in steelmaking production. Some steel mills directly use 5 - 10 kg aluminum ingots to be directly put into the ladle for deoxidation. In actual production, due to the large size and slow melting of aluminum ingots, uneven deoxidation leads to waste of raw materials and prolongs the refining time.
Adding circular aluminum cakes for deoxidation belongs to precipitation deoxidation. During precipitation deoxidation, the aluminum alloy is directly added to the molten steel to remove oxygen from the molten steel. This deoxidation method has a relatively high deoxidation efficiency, short time consumption, and less alloy consumption.
Advantages of steel-cored circular aluminum blocks/aluminum cakes for deoxidation:
1: The arc-shaped external structure improves the sliding performance between deoxidation blocks, facilitating the smooth feeding from the silo;
2: It melts quickly after being put into the molten steel, and the molten steel is uniformly deoxidized under force;
3: It is not easy to float up after sinking into the molten steel, shortening the deoxidation reaction time and improving the recovery rate of metallic aluminum. The aluminum content in steel-cored aluminum is ≥60%.
4: It is suitable for ladle refining and molten steel purification of various steels.
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