We all know that the main component of recarburizer is carbon. The carbon present in the recarburizer may be amorphous or crystalline. Compared with amorphous recarburizers, the recarburization speed of crystalline recarburizers is significantly faster, and the more graphite balls, the more stable the shape of graphite.
 

According to the presence of carbon in the recarburizer, it is divided into graphite recarburizer and non-graphite recarburizer. Graphite recarburizers include waste graphite electrodes, waste broken graphite electrodes, natural graphite particles, graphite coke and the like. In addition, silicon carbide (SiC) has a hexagonal structure similar to graphite and is also listed as one of the graphite recarburizers. Pitch, calcined graphite coke, acetylene coke pellets, calcined anthracite and other waste graphite fillers.
 

Application of recarburizer

The recarburization of the recarburizer is carried out by dissolving and diffusing the carbon in the cast iron. When the carbon content of the iron-carbon alloy is 2.1%, the graphite in the graphite recarburizer can be directly dissolved in the cast iron. Direct dissolution of non-graphite recarburizers is almost non-existent, but over time, carbon will diffuse and gradually dissolve into cast iron. The recarburization rate of graphite recarburizers is significantly higher than that of non-graphite recarburizers. For all graphite castings, graphite from graphite recarburizers can be used as eutectic cores and eutectic graphite cores. The composition ratio of using carbonaceous regrind and not using regrind is different. Under the condition of the same chemical composition of cast iron, the nitrogen content in cast iron will increase after regrind, but boron nitride will be formed, which can be used as crystalline graphite core. The foundation of graphite has created good conditions for the nucleation and growth of graphite. Therefore, while increasing the carbon content of cast iron, the recarburizer can improve the structure and performance of cast iron after solidification.

The carbon increase rate is the percentage of carbon increase per unit time. The absorption rate is the ratio of the carbon in the recarburizer being absorbed by the molten iron. The recarburization rate of cast iron and the absorption rate of carbon in the recarburizer are affected by the following factors:
Recarburizer type;
Carburizer particles;
Using temperature of recarburizer;
Iron solution composition;
The degree of stirring of the iron solution.