What materials are mainly included in the recarburizer
In the process of steelmaking, suitable and appropriate amount of recarburizer can be added to achieve a good recarburization effect and improve the quality of steel. After recent years of development, there are many types of recarburizers on the market, and suitable recarburizers can be used according to the production of different steels. Although the recarburizers can be divided into different types, most of the recarburizing materials contained therein include artificial graphite, calcined petroleum coke, natural graphite, coke, anthracite, etc.
Artificial graphite. The main raw material for manufacturing artificial graphite is powdered calcined petroleum coke, in which pitch is added as a binder, and a small amount of other auxiliary materials are added. After the various raw materials are matched, they are pressed into shape, and then processed in a non-oxidizing atmosphere at 2500-3000°C to make them graphitized. After high temperature treatment, the ash, sulfur, and gas content are greatly reduced.
Petroleum coke is currently a widely used recarburizer. Petroleum coke is a by-product of refining crude oil. Residual oil and petroleum pitch obtained by crude oil distillation under pressure or vacuum can be used as raw materials for making petroleum coke. After coking, raw petroleum coke can be obtained. The production of raw petroleum coke is less than 5% of the crude oil used. The annual production of raw petroleum coke in the United States is about 30 million tons. The raw petroleum coke has a high impurity content and cannot be used directly as a recarburizer. It must be calcined first.
Natural graphite can be divided into flake graphite and microcrystalline graphite. Microcrystalline graphite has a high ash content and is generally not used as a recarburizer for cast iron. There are many varieties of flake graphite: high-carbon flake graphite needs to be extracted by chemical methods, or heated to a high temperature to decompose and volatilize the oxides in it. This kind of flake graphite is not produced and expensive, and is generally not used as a recarburizer; low-carbon flakes The ash content in graphite is high, so it is not suitable to be used as a recarburizer; medium carbon graphite is mainly used as a recarburizer, but the amount is not large.
Recarburizer is one of our company's main products. We can recommend and provide suitable and practical recarburizers according to customer requirements. At the same time, based on years of understanding of recarburizers, we can introduce recarburizers in detail to users and provide more information about recarburizers.
