![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
[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)
Freezer Cold Storage Room,Cold Storage Room,Freezer Storage Room,Portable Cold Room
LONG TERM ELEC. CO., LTD , https://www.longterm-hvac.com