Recarburant Carbon Raiser Recarburizer GPC Supplier

Carbon raiser, also known as carbon additive or recarburizer, is a material added to molten metal to increase its carbon content. When being used in steelmaking or casting, the fixed carbon of carbon raiser can reach more than 95%. It has been widely used in various industries such as metallurgy, chemical, and power.

There are many kinds of raw materials and production processes for carbon raisers, including wood-based carbon, coal-based carbon, coke-based carbon, graphite-based carbon, with many sub-categories under each category. High quality carbon raisers generally refer to graphitized carbon additives. As the carbon atoms are arranged in a graphite-like microstructure under high temperature conditions, so it is called as graphitization. Graphitization can reduce the content of impurities in the carbon additive, increase the carbon content, and lower the sulfur content. When being used in casting, carbon raisers can significantly increase the amount of scrap steel used, reduce the amount of pig iron used, or eliminate the need for pig iron.

Carbon raisers are generally divided into carbon raisers for steelmaking and carbon raisers for casting. Some other additives also need carbon additives, such as for brake pad additives and being used as friction materials. Carbon raisers are external carbon sources for steelmaking and ironmaking. High quality carbon raisers are essential auxiliary additives for producing high quality steel.

Carbon raisers are generally divided into calcined petroleum coke (CPC), graphitized petroleum coke (GPC), calcined anthracite coal (CAC), electrically calcined anthracite, graphite electrode scraps, and graphite column carburizer. They are usually used for converter smelting or high-carbon steel smelting. The requirements for carbon raisers used in top-blown converter steelmaking are high fixed carbon content, low ash content, low volatile, low sulfur content, low phosphorus content, low nitrogen content and low other impurities. Besides, the carbon raisers also are required to be dry, clean, and in moderate particle size.

Low Ash & Sulfur: Sourced from high-quality raw materials, resulting in low ash and sulfur content.

High Fixed Carbon: Can achieve fixed carbon content above 95% in steel.

Depolarized & Partially Graphitized: The high-temperature processing results in a product with improved properties.

In the steelmaking process

Carbon raiser is usually used during the steelmaking processes in converters and electric arc furnaces. Because the carbon content of raw materials such as scrap steel and pig iron often fails to meet the requirements of the target steel type. Because the carbon content of raw materials such as scrap steel and pig iron often fails to meet the requirements of the target steel type. This ensures that low-alloy steel has sufficient carbon to guarantee strength, while high-carbon steel enhances hardness.

The requirements for carbon raiser are different depending on the type of steel. Common carbon steel is mostly treated with calcined petroleum coke as a carbon raiser. With a carbon content of 90% to 95%, this kind is cost-effective and stable. High-quality alloy steel (such as bearing steel) requires graphite-based carbon raiser. Its carbon content is over 98% and sulfur content is less than 0.05%, which can reduce the impact of impurities on toughness. At the same time, the carbon raiser can promote the flotation of non-metallic inclusions in the molten steel. This reduces pores, cracks and other defects, and improves the purity of the steel billet.

In cast iron production

Carbon raisers are essential auxiliary materials in cast iron production, because its performance is directly related to the carbon content. Under normal conditions, the carbon content of cast iron ranges from 2.11% to 6.69%. For gray cast iron, it needs to be 3.0% to 3.6%, and for ductile cast iron, it needs to be 3.6% to 3.8%.

During smelting, it can replenish the carbon lost due to the combustion of coke and the oxidation of iron materials. This ensures that the carbon content of the molten iron meets the standards. It can also control the form of carbon, which are used in the production of ductile cast iron. It can promote the carbon to precipitate as spherical graphite (instead of sheet-like), enhancing strength and toughness. This makes the cast iron have both wear resistance and ductility, and you can widely use it as key components.

In the foundry industry

To adjust the carbon equivalent of molten iron

Carbon equivalent is a key indicator for measuring the fluidity and solidification characteristics of molten iron, which is mainly used to evaluate the casting properties. If it is too high, it may cause graphite floating defects in the molten iron. While too low carbon equivalent will result in poor fluidity and cause problems such as insufficient pouring and cold shuts.

Carbon raiser can precisely supplement the carbon content, controlling the carbon equivalent of the molten iron within a reasonable range of 2.8% to 4.2%. This ensures smooth filling during casting and reduces solidification defects. In the production of gray cast iron parts, you can add an appropriate amount of calcined petroleum coke as a carbon raiser. This can raise it to 3.6% to 3.8% and then perfectly fill the cavities of complex cast parts such.

To improve the quality of castings

Carbon raiser enhances the quality of castings in multiple aspects:

Stabilize the carbon content

It ensures uniform properties such as hardness and wear resistance of the castings, thereby reducing waste caused by fluctuations in composition

Improve cutting performance

The carbon elements in high-quality carbon raiser tend to form fine and uniform graphite particles, which can "lubricate" the cutting tools. After adding it into the machine tool castings, it can reduce wear and improve processing efficiency.

Reduce defects

With the low sulfur and low nitrogen characteristics, it can reduce the occurrence of pores and shrinkage in the castings. Then it can significantly increase the product qualification rate in precision casting of automotive transmission gears and other components.

Other industrial applications

In the production of refractory materials

The carbon element content determines whether the refractory material can remain stable at temperatures above 1500℃. It can enhance its high-temperature resistance and corrosion resistance, so carbon raiser are often added when producing carbon composite refractory materials. After forming and sintering, it can enhance the thermal conductivity and oxidation resistance of the material.

After adding 5% to 10% carbon raiser to the aluminum-carbon refractory bricks, the high-temperature resistance of the material increases by more than 30%. This reduces the erosion by molten iron and slag, and prolongs the lifespan of the blast furnace. In the refractory coating of the continuous casting steel mold, adding it can reduce the adhesion to the molten steel. Thus avoiding scratches on the surface of the cast billet.

In the chemical and carbon materials fields

In the chemical industry

It can react with metal oxides at high temperatures to form compounds, which are important raw materials for abrasives and ceramic materials. For example, the carbonized silicon produced by its reaction has the high hardness and high temperature resistance. So you can use it in sandpaper, grinding wheels, and the structures of high-temperature kilns.

In the field of high-end carbon materials

High-purity carbon raiser is an important material for preparing graphene and carbon nanotubes. Because it can be reorganized into nano-carbon structures through chemical vapor deposition. With the excellent electrical conductivity and mechanical properties, you can use it in lithium battery electrodes, chip heat dissipation films, and other applications. Additionally, carbon raisers can be activated to produce porous activated carbon. And you can use it in environmental protection scenarios such as wastewater treatment and gas adsorption.

Because of its characteristics such as high carbon content, low impurities, and easy regulation, carbon raiser can help replenish carbon. It controls carbon content in industrial production and drives the innovation of high-performance materials. But as industrial upgrading progresses, the performance requirements for it increase, such as reducing carbon emissions. And in the future, its purity and applicability need to be enhanced through process innovation.

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