Composition and characteristics of steelmaking deoxidizer

There are many types of steelmaking deoxidizers. According to different steel materials, different types and different amounts of steelmaking deoxidizers can be added during steelmaking, and the quality of steel can be improved by deoxidizing the molten steel. Although there are many types of steel-making deoxidizers, most of the components in steel-making deoxidizers are those.

1. Manganese and manganese can improve the deoxidation capacity of silicon and aluminum. Manganese is an important deoxidizing element for boiling steel, because it does not inhibit the carbon-oxygen reaction, which is beneficial to obtain a good structure of the boiling steel ingot. Manganese can reduce the harm of sulfur. The manganese remaining in the steel after deoxidation and sulfur produce high-melting plastic inclusions, which reduces the tendency of steel to be hot embrittlement and reduces the harmful effects of sulfur.

2. Silicon is a commonly used deoxidizing element for killed steel. Silicon has a strong deoxidizing ability, and the oxygen content of molten steel balanced with silicon is very low. Under alkaline slag, the deoxidation ability of silicon can be fully exerted. This is because the deoxidation product of silicon is that silicon oxide can be combined with calcium oxide in the alkaline slag to form a stable element, thereby greatly reducing the activity of silicon dioxide. , Make the silicon deoxidation reaction proceed fully. However, when silicon is used alone for deoxidation, it is easy to generate solid and small-particle silicon dioxide, which is difficult to float up and be removed from the molten steel.

3. Aluminum is a strong deoxidizer. When the residual aluminum in the steel is a component, it eliminates the possibility of carbon oxide bubbles in the steel, thereby obtaining a steel ingot with a dense structure. Therefore, aluminum is often used as the final deoxidizer, and its deoxidizing ability increases with the decrease of temperature and the increase of slag basicity. Adding an appropriate amount of aluminum to the steel can form stable aluminum nitride with the nitrogen in the steel to prevent the formation of iron nitride, thereby reducing the aging tendency of the steel; in addition, deoxidizing with aluminum will generate a lot of small and highly dispersed steel in the molten steel Aluminum nitride and aluminum oxide, these fine solid particles can become the crystal grain core when molten steel is crystallized, making the crystal grain refined. In order to obtain fine-grained steel, the amount of aluminum added is usually 0.06-0.12% depending on the carbon content in the steel.

4. The affinity between calcium and oxygen is very large, and its deoxidizing ability is stronger than aluminum. Although calcium is a strong deoxidizer and desulfurizer, its solubility in molten iron is very small, only 0.15%-0.16%; and Calcium has a low density and a very low boiling point. When pure calcium is added to molten steel, it will rise rapidly and evaporate, and the utilization rate is very low. These are the common constituent elements in steel-making deoxidizers, and these elements can be combined at will to form different steel-making deoxidizers, and different steel-making deoxidizers can be added according to different steels.

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