Recarburizer

High carbon, low sulfur, low nitrogen,high graphitization degree,high carbon recovery (92% ~ 98%),with stable effect on improving the carbon content.

There are many kinds of raw materials for carburizers, andthe production processes are also different, including woody carbon, coal carbon, coke, graphite, etc., among which there are many small types under various classifications. High- quality recarburizers generally refer to graphitized recarburizers. Under high temperature conditions, the arrangement of carbon atoms is in the microscopic form of graphite, so it is called graphitization.

Graphitized Petroleum coke is mainly used for metallurgy & foundry, it can improve the carbon content in steel-melting and casting, Also it can increase the quantity of scrap steel andreduce the quantity of pig iron, or use no scrap iron at all. It’s also can be used for brake pedal and friction material.

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Model:
90,92,95,98
Brand:
FEIYUE

Product Description

Carbon Raiser (also known as Carbon Additive) refers to a carbon-containing material added during the smelting of steel and iron to compensate for carbon loss. During the melting process, factors such as extended smelting time, holding duration, and prolonged overheating can lead to a decrease in carbon content. As a result, the actual carbon level may fall below the target refining specification. The addition of a carbon raiser helps achieve the desired carbon content.

High-quality carbon raiser is an essential auxiliary material for producing high-grade steel and iron castings. Hongshun also supplies other ferroalloy products including silicon metal, ferrosilicon, and silicon slag for steelmaking and various industrial applications.

Specification of carbon raiser

Model Item	C(min) (%)	S(max) (%)	Ash(max) (%)	Volatile Matter(max) (%)	Moisture(max) (%)
GPC	98%	0.05	0.3	0.5	1
CPC	98.5%	0.05-0.35	0.3	1	1
CAC	85-93	0.35	4-8	1	1
Size: 1-3mm, 3-5mm, 5-8mm Packing: 5kg bag or one-ton jumbo bag packing as per customer requirement.

Applications of carbon raiser

Carbon raiser is primarily used in electric arc furnace (EAF) steelmaking and ductile iron foundries. It effectively increases carbon content, allows for a higher proportion of scrap steel usage, and reduces or even eliminates the need for pig iron. Replacing traditional recarburizers helps lower steelmaking costs. It is also used in metallurgy, glass manufacturing, casting, graphite crucible production, and the smelting of non-ferrous metals such as aluminum and titanium.

Feeding Method of carbon raiser

In EAF steelmaking, the carbon raiser should be charged together with scrap steel and other raw materials. Small amounts can be added to the surface of molten iron. However, adding large quantities all at once should be avoided to prevent excessive oxidation, poor carbon recovery, and insufficient final carbon content. The amount of carbon raiser added depends on the charge composition and target carbon level. Different types of cast iron may require different kinds of carbon additives.

Using high-purity graphitized carbon raiser helps minimize the introduction of impurities into the molten iron. Selecting the appropriate type of carbon additive can also help reduce overall production costs.

Types of Carbon Additives

Common types of carbon raiser include:

Calcined Petroleum Coke (CPC)
Graphite Petroleum Coke (GPC)
Calcined Anthracite Coal (CAC)
Electrically Calcined Anthracite
Natural Graphite

Below are introductions to the most widely used varieties:

CAC: Calcined Anthracite Coal
Produced from anthracite coal that has been heat-treated at around 1300°C to reduce volatile content and increase fixed carbon.

CPC: Calcined Petroleum Coke
This is one of the most suitable carbon additives for steelmaking. Raw petroleum coke contains high levels of impurities and cannot be used directly. After calcination at 1200–1400°C, moisture, volatiles, and other impurities are largely removed, resulting in a material with a carbon content of up to 98.5%. The resulting particles are irregular in shape, have a metallic luster, and contain visible pores. The quality of CPC heavily depends on its sulfur content, which directly affects steel quality.

GPC: Graphite Petroleum Coke
This material is also produced from raw (green) petroleum coke, but calcined at much higher temperatures (up to 3000°C), resulting in a highly graphitized product. It features very low sulfur, nitrogen, and phosphorus contents, and is especially suitable for ductile iron production due to its fast absorption, high carbon yield, and low sulfur content.

Benefits of Using Carbon Additives

The use of carbon additives offers three major advantages in the production of precision castings:

Production of High-Strength Cast Iron with High Carbon Content
By using a charge composed entirely of scrap steel along with carbon additives, the resulting molten iron achieves higher purity. This process supports the production of high-performance cast iron with improved mechanical properties, even at elevated carbon levels.
Enhanced Graphite Nucleation and Reduced Oxidation
The recarburization process—particularly in electric furnace melting—not only increases the carbon content but also promotes the formation of graphite nuclei. This improves the microstructure of the metal while simultaneously reducing oxidation of the molten iron.
Reduction or Prevention of Shrinkage Defects
The addition of carbon additives is one of the most effective methods to minimize shrinkage porosity in castings. This is due to the graphitization expansion that occurs during solidification, which compensates for volume contraction and results in denser, more dimensionally stable castings.