Carburizer is an auxiliary material used in the process of steel smelting and casting, mainly used to make up for the carbon content burned during the steel smelting process. Carburizer helps achieve the expected carbon content by increasing the carbon content in molten iron or steel, thereby improving the mechanical properties and quality of castings.
Definition and Uses
Carburizer refers to the process in which the carbon element in the molten iron is lost due to factors such as long smelting time, insulation time, and overheating time, which increases the amount of carbon element melting loss in the molten iron and reduces the carbon content. In order to make up for this part of the burned carbon content, it is necessary to add carbon-containing substances, which is the carburizer.
The use of carburizer can not only make up for the carbon content, but also improve the nucleation ability of molten iron and refine the grains, thereby improving the tensile strength, hardness, wear resistance and fatigue limit of the castings.
Types and Compositions
Carburizers can be divided into the following categories according to the production raw materials:
Wood carbon: obtained by high-temperature treatment of wood.
Coal-based carbon: including common calcined coal recarburizer, asphalt coke recarburizer, metallurgical coke recarburizer, etc.
Coke: such as petroleum coke recarburizer, calcined petroleum coke recarburizer, etc.
Graphite: including artificial graphite recarburizer, natural graphite recarburizer, composite graphite recarburizer, etc.
High-quality recarburizer usually refers to a graphitized recarburizer. Under high temperature conditions, the arrangement of carbon atoms in this recarburizer is in the microscopic form of graphite, which can reduce the impurity content, increase the carbon content, and reduce the sulfur content.
Application scenarios and effects Carburizers are used in casting to significantly increase the amount of scrap steel, reduce the amount of pig iron or eliminate pig iron, thereby reducing the production cost of castings.
In addition, recarburizers can also improve the distribution of carbon and alloying elements in cast metals, make castings dense and uniform, and eliminate segregation during casting