What is a recarburizer? In order to achieve a specific carbon content in the casting and smelting process, the recarburizer added to the molten metal is collectively referred to as a recarburizer. Carburizer is a very common product in the foundry industry and has always been welcomed by the industry.
1. Introduction of carburizer
There are many kinds of carburizers, including coal, natural graphite, artificial graphite, coke and other carbonaceous materials. The physical indicators of carburizers are mainly melting point, melting rate and chemical indicators. The chemical indicators are mainly carbon content, sulfur content, nitrogen content, and water content. Sulfur and hydrogen are harmful elements. Within a certain range, nitrogen is a suitable element. In the production of synthetic cast iron, better quality carburization The agent refers to the graphitized recarburizer, because under high temperature conditions, the carbon atoms are arranged in the microscopic form of graphite, so it is called graphitization. Graphitization can reduce the content of impurities in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content. Carburizers can greatly increase the amount of scrap steel used in casting, and realize the use of less or no pig iron.
2. The role of carburizing agent
Carburizer is an important raw material for melting molten iron in an induction furnace, and its quality and usage directly affect the quality of molten iron. Castings have certain requirements for carbon, so carburizers are used to increase the carbon content in molten iron. For example, pig iron, scrap steel, and recycled materials are commonly used in smelting. Although the carbon content of pig iron is high, the cost is relatively low. It is higher for scrap steel, so the use of carburizer can increase the amount of scrap steel and reduce the amount of pig iron, so as to reduce the cost of castings.
3. Characteristics of carburizer
Graphite recarburizer has the characteristics of high carbon (≥98%), low sulfur (≤0.05%), low N (≤600PPm), and high-temperature fusibility. For the purpose of increasing the tensile strength and reducing the cost, the tensile strength of the casting can be increased by 20—50Mpa.
After the above introduction, I believe that everyone should understand what is a carburant. The use of carburizer in castings can effectively reduce production costs, and can also improve the smelting quality of castings. It is an indispensable one in the cast iron smelting industry. Additives, and the high-temperature graphitized recarburizer has the characteristics of fast absorption, high carbon, low sulfur, and high absorption rate.