Why are recarburizers essential in steel smelting

In the smelting process, due to improper ingredients or charging and excessive decarburization and other reasons, sometimes the carbon content in the steel does not meet the requirements of the peak period, and then carbon should be added to the molten steel. Commonly used recarburizers are recarburized pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder.

When smelting medium and high-carbon steel grades in a converter, petroleum coke with few impurities is used as a recarburizer. The requirements for the recarburizer for top-blowing converter steelmaking are high fixed carbon, low ash, volatile, and sulfur, phosphorus, nitrogen and other impurities, dry, clean, and moderate particle size. For casting, cast iron, cast steel, and castings, there is a requirement for carbon. Then the recarburizer, as the name implies, is to increase the carbon content in the molten iron. For example, the commonly used furnace materials in smelting are pig iron, scrap steel, and recycled materials. The carbon content of pig iron is high, but the purchase price is higher than that of scrap steel. Therefore, increasing the amount of scrap steel, reducing the amount of pig iron, and adding recarburizer can play a role in reducing the cost of castings.