[China Aluminum Network] LF process molten steel is heated by the high temperature of the arc, the arc is a high-temperature high-speed gas jet, its impact on the molten pool and the role of oxygen stream in the LD converter impact process in essence Is similar. They all create a pit at the point of impact. The pit depth is related to the arc voltage and arc current. When the arc current is in the range of 20-85 kA, the average (pit depth/arc current) is 3 mm/kA. At present, the operating arc of the ladle furnace is between 20-28.8kA so that the depth of the impact pit is 60-90mm. When the electrode is heated, a bare steel surface will appear at the pit, and this part of the exposed molten steel has a higher temperature than other parts of the molten steel. When it is a cathode, the temperature is 2400K, and when it is an anode, it is 2600K. If it is deoxidized with Al At this temperature, the Al-O equilibrium constant value K is very large, according to the Al-O reaction:

2[Al]+3[O]=A1203(s)

The deoxidation product is generally pure A1203. The activity of Al and O is Henry's law, so the equilibrium constant can be expressed as:

K=[%Al]2[%O]2

lgK=-64900/T+20.63

In the case of 2500K, it is assumed that the acid-soluble Al in the molten steel is 0.1% and the oxygen equilibrated with it is 771×10 -4%. The amount of acid-soluble aluminum in the molten steel when entering LF is not higher than O.04%. In other words, the oxygen content is even higher with Al, which creates the conditions for the oxygen absorption of molten steel. (China Metallurgical News)

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