When the initial carbon content in the molten iron is high, under a certain dissolution limit, the absorption speed of the recarburizer is slow, the absorption amount is small, the burning loss is relatively large, and the absorption rate of the recarburizer is low. When it is low, the situation is the opposite. In addition, silicon and sulfur in the molten iron hinder the absorption of carbon and reduce the absorption rate of the recarburizer; while the manganese element contributes to the absorption of carbon, updating the iterative recarburizer absorption rate, in terms of the degree of influence , Silicon is the largest, followed by manganese, and carbon and sulfur have less impact. Therefore, in the actual production process, manganese should be added first, then carbon, and then silicon.
However, the general recarburizer for gray casting requires a lower sulfur content. Normal sulfur below 0.5 can be used. The requirements are not so strict. Generally fixed carbon 98.5/98/90/95/92 can be used, and even some In order to save costs, the manufacturer can also use fixed carbon 85, as long as the final absorption rate can be reached.
Therefore, if the castings produced are different, the final selected recarburizer type is different, and the final use effect is also different.