What is the role of recarburizer for foundry

The use of recarburizers cannot compensate for the loss of carbon combustion during the steel smelting process. The carbon content of specific steel grades can also be used for post-furnace adjustment. The recarburizer is an important raw material for smelting molten iron in an induction furnace, and its quality and use directly affect the state of the molten iron.

The carbon content in the ladle can be adjusted by adding a specific brand of recarburizer to the ladle after slag removal and degassing, so as to achieve the purpose of one package with multiple numbers. The materials used in the carburetor mainly include graphite, graphite-like, electric block, coke, silicon carbide and other materials. Commonly used electric blocks and silicon carbide recarburizers have the advantages of high carbon content and strong oxidation resistance, but the production process is complicated and the cost is high; using coke powder and graphite as recarburizing materials, the production cost is lower than that of electric blocks, but the ash content With high sulfur content and low carbon content, the carbon increase effect is not good.

The selection of recarburizer for foundry should strictly control the quality. Recarburization belongs to the addition of recarburizing raw materials for steelmaking and ironmaking. It can prolong the service life of the furnace wall, reduce the amount of slag, make the slag removal operation simple, and reduce the cost of molten iron. High-quality recarburizer is an auxiliary additive for the production of high-quality steel.

Index of recarburizer for foundry: fixed carbon: 91-95%, sulfur content: 0.08-0.1%;

Granularity of casting recarburizer: 1-5 mm.

The role of recarburizer for foundry;

1. Recarburizer is a high-quality silicon source and carbon source.

(1) The deoxidizing effect is strong, which can reduce the addition of spheroidizing agent.

(2) The recarburizer can prevent the precipitation of carbides and is beneficial to increase the ferrite content.

(3) The use of recarburizer can increase the spheroidization rate of ductile iron.

2. The use of recarburizer can extend the life of the furnace wall by 30%

3. The amount of slag is reduced, and the slag removal operation is simple.

4. Rusty scraps and alloys can be used to reduce the cost of molten iron.

5. After use, the white mouth can be reduced, the cutting performance can be obviously improved, and the mechanical performance can be improved.

6. Increase fluidity, stabilize the composition of molten iron and prevent segregation.

7. Reduce the sensitivity of wall thickness. The structure is compact and the cutting surface is smooth.

8. Like ferrosilicon, there is no need to worry about the content of aluminum in the molten iron.

9. Don't worry about the increase of sulfur in the molten iron during use.

The use of recarburizers in casting can greatly increase the consumption of scrap steel, reduce the consumption of pig iron or eliminate the need for pig iron. The characteristic of the recarburizer itself is to select pure graphitized carbonaceous materials to reduce excessive impurities in the pig iron. Proper selection of the recarburizer can reduce the production cost of castings.