carbon additive 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.