Composition and characteristics of deoxidizer for steelmaking
2019-07-15
Believe that many steel manufacturers, or engaged in the steelmaking industry, is no stranger to deoxygenators. Know that there are many types of steel-making deoxygenators, in steelmaking can have different kinds of steel, add different kinds, different components of steel-making deoxygenator, through the deoxygenation treatment of steel liquid, improve the quality of steel.
Although there are many kinds of deoxygenators, most of the components of steel-making deoxygenators are those. 1, manganese, manganese can improve the deoxygenation capacity of silicon and aluminum. Manganese is an important deoxygenation element of boiling steel because it does not inhibit the carbon-oxygen reaction, thus facilitating the organization of good boiling steel ingots.
Manganese can reduce the harm of sulfur, after deoxygenation remains in the manganese in steel and sulfur production of high melting point of plastic inclusions, reduce the tendency of steel brittle, reduce the harmful effect of sulfur. 2, silicon is a commonly used deoxygenation element of sedative steel, silicon deoxygenation capacity is strong, and silicon balance of the oxygen content of steel liquid is very low. Under alkaline slag, the deoxygenation capacity of silicon can be fully utilized, because the deoxygenation product of silicon is silicon oxide can be combined with calcium oxide in alkaline slag into a stable element, thus greatly reducing the activity of silica, so that the silicon deoxygenation reaction is fully carried out.
However, when silicon is deoxygenated alone, it is easy to produce solid and small particles in the state of silica, it is difficult to float from the steel liquid and exclude. 3, aluminum is a strong deoxygenator, steel residual aluminum for a few fractions, it excludes the possibility of forming carbon dioxide bubbles in the steel, so as to obtain structural dense ingots. As a result, aluminum is often used as a final deoxygenator, and its deoxygenation capacity increases with the decrease of temperature and the increase of slag alkalinity. The addition of the appropriate amount of aluminum in the steel can form a stable aluminum nitride with nitrogen in the steel, preventing the formation of iron nitride, thereby reducing the aging tendency of the steel, in addition, with aluminum deoxygenation, the steel liquid will produce a lot of small and highly dispersed aluminum nitride and aluminum trioxide, these small solid particles can become the grain core of the crystallization of the steel liquid, so that the grain is refined. In order to obtain fine grain steel, aluminum is usually added to the amount of 0 depending on the carbon content in the steel. 06-0.12%. 4, calcium and oxygen affinity is very large, its deoxygenation capacity is also stronger than aluminum, calcium is a strong deoxygenation agent and desulfurization agent, but its solubility in iron water is very small, only 0. 15%-0.16%; and the density of calcium is small, the boiling point is very low, when pure calcium is added to the steel liquid, it will quickly float and evaporate, the utilization rate is very low.
Steel-making deoxygenator These are the common components of steel-making deoxygenators, and these elements can be combined at will to form different steel-making deoxygenators, according to the refining of different steel, add different steel-making deoxygenators. Of course, if you face many different steel-making deoxygenators, do not know how to choose, do not know what kind of steel-making deoxygenator meets the requirements, welcome to contact with my company, my company will be based on your requirements, to provide reliable quality, reasonable price of steel-making deoxygenator.
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