Consumption of graphite electrode end and outer surface in electric furnaceThe arc produced by the graphite electrode in the electric arc furnace is divided int
Consumption of graphite electrode end and outer surface in electric furnace
The arc produced by the graphite electrode in the electric arc furnace is divided into long, medium and short arcs. The melting of the charge and the temperature rise depend on the arc power. The arc length is proportional to the secondary voltage, and is inversely proportional to the secondary current and the heating rate. In order to increase the smelting speed and greatly shorten the smelting time, the high chemical energy operation of forced oxygen blowing is used, which places higher requirements on the oxidation resistance and thermal shock resistance of graphite electrodes. The end consumption of graphite electrodes during smelting includes-sublimation generated in the high temperature of the arc, and chemical reactions in contact with molten steel and steel slag. The oxidation loss of the graphite electrode accounts for about 2/3 of the total consumption. Its oxidation loss is the product of the unit oxidation rate and area and has a proportional relationship with time. The longer the heating time in smelting, the greater the consumption. Therefore, it is installed on the arc furnace electrode. Water-cooled spray systems are necessary. In normal smelting, the carbon content of the graphite electrodeentering the molten steel is generally about 0.01%, and it is normal for the end consumption switch to be non-conical.
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Harm of too high temperature: when molten steel out of cooper mold, the billet shell is thin and easy to break out; The accelerated erosion of refractory can ea
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1. The barrier function (mainly completed by the liquid slag layer) isolates the contact between air and molten steel, blocks the secondary oxidation of molten
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In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or