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| The Carburization Mechanism and Usage of Graphite Carburizing Agent |
| 2023-06-06 15:24:54 Number of visits：1752 |
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The key to synthesizing cast iron by electric furnace melting is to select and add carburetors, manganese regulating slag additives, industrial waste iron, control smelting quality, use carburetors to increase carbon content, adjust chemical composition, improve the structure and properties of cast iron, and utilize industrial waste iron at a lower price to reduce costs. In order to achieve better carbonization effect, crystal graphite carburizing agent is selected. Crystal structure graphite carburetor can mainly be used for high toughness ductile iron castings (wind power ductile iron castings), austenitic ductile iron castings, and complex gray cast iron and ductile iron diesel engines in large enterprises for cylinder and cylinder heads; The application of crystal graphite carburizing agent, scrap steel, and a large amount of recycled material is a new technology for low-cost products, high added value, and high-performance ductile iron castings.
The carburization of carburetors is achieved through the dissolution and diffusion of carbon in molten iron. When the carbon content of iron-carbon alloy is 2.1%, the graphite in the graphite carburetor can be directly dissolved in the molten iron. The direct dissolution phenomenon of non graphite carburization basically does not exist, but over time, carbon gradually diffuses and dissolves in the molten iron. The carburizing speed of graphite carburizing agents is significantly higher than that of non graphite carburizing agents. For all graphite cast irons, the graphite in the graphite carburetor can serve as both eutectic and eutectic graphite nuclei. By using carbon based carburizing agents and not using carburizing processes with different ingredient ratios, under the same chemical composition of the molten iron, the nitrogen content in the carburized cast iron continues to increase. However, boron nitride can be formed as the substrate for the crystallization core of graphite, creating a good nucleation and growth condition for graphite. Therefore, carburizing agents can improve the microstructure and properties of molten iron after solidification while increasing its carbon content.
The rate of carbon increase is the percentage of carbon increase per unit of working time. The absorption rate is the rate at which carbon in a carburetor is absorbed by molten iron. The rate of carburization in molten iron and the absorption rate of carbon in the carburizing agent are mainly influenced by the following factors.
① Type of carburizing agent;
② Carburizer particles;
③ Carburization treatment temperature;
④ Composition of molten iron;
⑤ The degree of stirring of molten iron.
The carbon increasing efficiency of graphite electrodes is relatively fast, and during electric furnace melting, the absorption rate is generally around 85%. The stronger the stirring of molten iron, the higher the decarbonization efficiency, which can reach 90% at 1450 ℃.
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