In the heat treatment industry, carbon content will have a great impact on various properties of metals.
The furnace materials commonly used in smelting are pig iron, scrap steel and recycled materials. The carbon content of pig iron is high, but the purchase price is also relatively high. Therefore, the most commonly used material for smelting is scrap steel, which can reduce the cost of castings.
If scrap steel is used as raw material, the carbon content in steel may not meet the requirements of the top period due to improper batching, insufficient charging, excessive decarburization in smelting and other reasons in the process of smelting metal in electric furnace.
At this time, it is necessary to add carbon to the molten steel, and the best way is to use a carburetor.
There are many materials that can be used as carburizing agent for cast iron, such as artificial graphite, calcined petroleum coke, natural graphite, coke, anthracite and mixtures made of such materials.
Steelmaking carburizing agent can be used for casting, cast iron, cast steel and other different processes, but the carburizing agent is suitable for smelting in induction furnace, but the specific use varies according to the process requirements.
Carburizing agent is used in medium frequency electric furnace smelting, which can be added into the lower part of the electric furnace with materials according to the ratio or carbon equivalent requirements, and the recovery rate can reach more than 95%;
If the carbon content of molten iron is insufficient to adjust the carbon content, first clean the slag in the furnace, and then add a carburetor. The carbon is dissolved and absorbed by heating the molten iron, electromagnetic stirring or manual stirring, and the recovery rate can be about 90%.
If the low temperature carburizing process is adopted, that is, the furnace charge only melts a part, and the molten iron temperature is low, all the carburizing agents are added into the molten iron at one time, and the solid furnace charge is used to press it into the molten iron to prevent it from exposing the surface of the molten iron. This method can increase the carbon content of molten iron by more than 1.0%.
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