rp 750 graphite electrode

The use process of rp 750 graphite electrode in electric arc furnace steelmaking

Scrap steel is the main raw material for electric arc furnace steelmaking. The quality of scrap steel directly affects the quality, cost and productivity of rp 750 graphite electrode. Therefore, there are several requirements for scrap steel:

(1) The surface of the scrap steel should be clean and less rusty, because the sediment and other impurities in the scrap steel will reduce the conductivity of the charge, extend the melting time, and affect the effect of dephosphorization and furnace erosion during the oxidation period. Lining. When the scrap steel is severely corroded or contaminated by oil, the rp 750 graphite electrode joint will reduce the yield strength of steel and alloying elements, and increase the hydrogen content in the steel.

(2) Non-ferrous metals such as lead, tin, arsenic, zinc, copper, etc. shall not be mixed into scrap steel. Lead has high density, low melting point, and is insoluble in molten steel. It is easy to deposit in the cracks at the bottom of the furnace, causing a steel breakout accident. Tin, arsenic, and copper can easily cause hot embrittlement of steel.

(3) In order to ensure safe production, sealed containers, flammable, explosive, and toxic substances are not allowed to be mixed into scrap steel.

(4) The chemical composition of scrap steel should be clear, and the content of sulfur and phosphorus should not be too high.

(5) The shape and size of scrap steel should not be too large (the cross-sectional area should not exceed 150 mm*150 mm, and the maximum length should not exceed 350 mm). In electric arc furnace steelmaking, pig iron is generally used to increase the carbon content of the charge. The carbon content of the charge is generally less than 30% of the carbon content of the charge.