Matters needing attention in the use of recarburizer for foundry

The role of the recarburizer for foundry is to increase the carbon content in castings and steel castings. The recarburizer, as the name suggests, is to increase the carbon content in the molten iron. For example, it is often used for smelting furnace materials, such as pig iron, scrap steel, recycled materials, iron and high carbon content parts, but the purchase price is higher than that of scrap steel. Therefore, increasing the supply of scrap steel, reducing the amount of pig iron, and increasing the carbon agent can reduce casting costs.

There are many kinds of recarburizers, and there are many kinds of materials that can be used as cast iron recarburizers, but the quality and price vary greatly. Under the premise of casting quality, casting aids should be correctly selected according to the characteristics and quality requirements of the company's products.

What is the role of recarburizer for foundry?

The use of recarburizers in castings can greatly increase the amount of scrap, reduce the amount of pig iron or eliminate the need for pig iron. In the feeding method of electric furnace smelting, the recarburizer should be fed into the furnace together with the scrap steel and other ingredients. A small amount can be added to the surface of the molten iron. However, a large amount of molten iron should be avoided to avoid excessive oxidation, resulting in insignificant carburizing effect and insufficient carbon content in castings. The amount of recarburizer added should be determined according to the ratio of other raw materials to the carbon content. For different types of cast iron, choose different types of recarburizers according to your needs. According to the characteristics of the recarburizer itself, the pure graphitized material containing carbon is selected to reduce the excessive impurities in the pig iron, and the choice of the recarburizer can reduce the production cost of the casting.

The addition time of the recarburizer cannot be ignored. If the carburizing agent is added too early, it will easily adhere to the bottom of the furnace, and the carburizing agent attached to the furnace wall will not easily melt into molten iron. Conversely, if the time for adding carbon is too late, the opportunity to add carbon will be lost, resulting in slower melting and heating time. This will not delay the time of chemical composition analysis and adjustment, and will cause damage due to overheating. Therefore, in the carburizing process, a small amount of metal filler is added to the carburizing agent.

In the case of a large increase in the recarburizer for foundry, combined with the hot metal overheating operation in the induction furnace, the absorption time of the recarburizer in the molten iron is 10 minutes. On the one hand, the recarburizer is fully diffused and absorbed through electromagnetic stirring, and the absorption effect is achieved. On the other hand, the nitrogen content in the recarburizer can be reduced.