Recarburizer definition and meaning from manufacturer

Recarburizer is currently widely used in a variety of industries, but its definitions is generally inaccurate. If you want a specific and correct understanding of what recarburizers is, it is better to be explained by the recarburizers manufacturers.

What is a recarburizer?

The recarburizer is a metallurgical material rich in carbon elements, used for the adjustment of carbon elements in the metallurgical process. According to the different production processes, it can be roughly divided into coal recarburizers, petroleum coke recarburizers, and graphite recarburizers. The raw materials used to produce the recarburizer are petroleum coke, coal, graphite powder, etc., which are made by electric furnace smelting, calcinations, graphitization and other processes

Coal recarburizer

The raw material of coal recarburizer is high-quality anthracite. Through high-temperature calcination and electric furnace smelting, so that the sulfur, nitrogen and other elements are reduced. Coal recarburizer has the advantages of high carbon content and economical benefits. It is currently a common recarburizer product in steel mills and foundries.

Petroleum coke recarburizer

The raw materials of petroleum coke recarburizer are pitch coke, petroleum coke, etc., which have the advantages of high ignition point, good insulation performance, high carbon content, low sulfur and low nitrogen, and are widely used in casting processes.

Graphite recarburizer

It is formed by pressing graphite powder, and the appearance is cylindrical. The graphitized recarburizer after high temperature graphitization has the advantages of good absorption, high carbon content, less impurities, low sulfur and nitrogen, and in the production of some high-quality castings can significantly improve the casting quality and reduce the chilling tendency.

Application of recarburizer in casting

In the casting process, a large amount of pig iron needs to be added to supplement the carbon element, resulting in higher casting costs. After the use of recarburizers, the amount of pig iron used is greatly reduced, even without the use of pig iron. Because the price of recarburizer is lower than that of pig iron, it effectively reduces the cost of casting. At present, recarburizers are mainly used in the production process of gray cast iron and graphite cast iron in the foundry field. Different types of recarburizers are put into the molten iron to achieve different effects. For example, graphitization recarburization is added during the production of graphite cast iron, it can effectively improve the nucleation ability of graphite, improve the distribution of graphite from A to B, and greatly improve the quality of graphite cast iron.

How to use recarburizer

At present, the popular method of using recarburizer is generally electric furnace for smelting, but some manufacturers use cupola for smelting.

When using recarburizer in an electric furnace, the recarburizer should be put into it along with scrap steel and other charge. Small doses can be added to the surface of the molten iron, but it is necessary to avoid large batches of charging into the molten iron to prevent excessive oxidation and the carbon effect is not obvious and the carbon content of the casting is not enough.

The recarburizer is added to the furnace when charging, and the recarburizer is mixed with the charge, placed on the bottom and middle of the induction furnace, and added to the furnace along with the metal charge when charging. Because of the long acting time, the recarburization efficiency is much higher than that when molten iron is added during iron tapping, and the recarburization efficiency is higher. Choose a recarburizer with high carbon content and low content of other components such as impurities. If other content is higher, such as higher ash content, it will inhibit the recarburization effect and increase time and labor costs. If the nitrogen content is relatively high, it will make the casting nitrogen porosity, affect the casting performance.

Absorption rate of recarburizer

Different production processes have a great influence on the absorption rate of recarburizers. Generally, the absorption rate of the recarburizer after the graphitization high-temperature calcination process is better. When using a recarburizer, the amount and temperature of the recarburizer should be strictly controlled. The length of time determines the absorption rate and utilization rate of the recarburizer. If necessary, the molten iron can be stirred to increase the absorption rate of the recarburizer.