The consumption mechanism of graphite electrodesGraphite electrode is used as a conductive material in electric arc furnace smelting, and its consumption is pr
The consumption mechanism of graphite electrodes
Graphite electrode is used as a conductive material in electric arc furnace smelting, and its consumption is proportional to the consumption of electrical work. Modern electric arc furnace steelmaking uses electric energy and chemical energy as thermal energy to achieve the purpose of four removal (P, C, O, S), two removal (gas, impurities), and two adjustment (temperature, composition) in the steelmaking process. The performance of the graphite electrode is mainly reflected in its applicability and consumption, and the consumption of the electrode is directly related to its own quality. The consumption of graphite electrodes in electric arc furnace smelting is mainly composed of the following parts.
1. Consumption of the end of the graphite electrode and the outer surface in the electric furnace
The arc generated by the graphite electrode in the electric arc furnace is divided into long, medium and short arcs, and the melting of the charge and the temperature rise depend on the arc power. The arc length is directly proportional to the secondary voltage, and 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 adopted, which puts forward higher requirements on the oxidation resistance and thermal shock resistance of the graphite electrode. The end consumption of graphite electrodes in smelting includes the sublimation generated in the high temperature of the arc, and the chemical reaction generated in contact with molten steel and steel slag. The oxidation loss of graphite electrode accounts for about 2/3 of the total consumption. The oxidation loss is the product of unit oxidation rate and area and is directly proportional to time. The longer the heating time in smelting, the greater the consumption, so install it on the electric arc furnace electrode. Water-cooled sprinkler system is very necessary. In normal smelting, the carbon content of the graphite electrode entering the molten steel is generally about 0.01%, and it is normal for the end consumption switch to be non-cone-shaped.
shengmiao
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
shengmiao
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
shengmiao
In continuous casting, low corrosion resistance often occurs, which directly leads to uneven composition and will eventually affect the smelting quality. In or