How to use recarburizer when smelting in electric furnace?
In the heat treatment industry, carbon content will have a great impact on various properties of metals.
Commonly used charge in smelting are pig iron, scrap steel and return charge. Pig iron has a high carbon content, 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, in the process of smelting metal in the electric furnace, due to inappropriate ingredients, insufficient charging and excessive smelting decarburization, sometimes the carbon content in the steel does not meet the requirements of the top stage.
At this time, it is necessary to add carbon to the molten steel, and the best way is to use a carburizer.
There are many materials that can be used as cast iron recarburizers, commonly used are artificial graphite, calcined petroleum coke, natural graphite, coke, anthracite and mixtures made of such materials.
Steel-making recarburizers can be used in different processes such as casting, cast iron, and cast steel. However, recarburizers are suitable for smelting in induction furnaces, but their specific uses vary according to process requirements.
When using recarburizer in intermediate frequency electric furnace smelting, it can be added to the middle and lower parts of the electric furnace 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, add a carburizer, and heat the molten iron, electromagnetic stirring or manual stirring to dissolve and absorb the carbon, and the recovery rate can be about 90%.
If the low temperature carburizing process is adopted, that is, only part of the charge is melted, and the molten iron temperature is low, all the carburizers are added to the molten iron at one time, and at the same time, the solid charge is pressed into the molten iron to prevent it from being exposed. molten iron surface. In this method, the carburization of molten iron can reach more than 1.0%.
The above is the knowledge about recarburizers summarized by the editor. I hope it can be helpful to you. Welcome to pay attention to us and let us provide you with more services.