Generally, if the foundry uses a 750 kg furnace, it should generally choose some medium-temperature Graphite recarburizer. This recarburizer can be melted without a special high furnace temperature, and the final absorption rate is also very acceptable. Generally, the medium temperature Graphite carbon agent refers to the sulfur below 0.3, the fixed carbon is generally above 98, and the particle size is generally 1-5mm or 1-3mm. This kind of recarburizer is most suitable for 750 kg furnaces in foundries. Carbon agent too.
When the initial carbon content of the molten iron is high, the absorption rate of the recarburizer will be slower under a certain solubility limit, the absorption amount is small, the combustion loss is greater, and the absorption rate of the recarburizer is low. When the initial carbon content of the molten iron is low, the situation is reversed. In addition, the silicon and sulfur in the molten iron hinder the absorption of carbon and reduce the absorption rate of the recarburizer; the manganese element helps the absorption of carbon and improves the absorption rate of the recarburizer. In terms of the degree of influence, silicon is the largest, manganese is the second, and carbon and sulfur are less. Therefore, in the actual production process, manganese should be added first, then carbon, and then silicon.