A kind of coke obtained by delayed coking of residual oil. The essence is a partially graphitized carbon form. It is black in color and porous, in the form of stacked granules, and cannot be melted. The elemental composition is mainly carbon, occasionally containing a small amount of hydrogen, nitrogen, sulfur, oxygen and some metal elements, and sometimes with moisture. Widely used in metallurgy, chemical industry and other industries as electrodes or raw materials for the production of chemical products.

Here are many kinds of raw materials for the addition of carbon, the production process is also different, there are wood carbon, coal carbon, coke, graphite and so on, which under the various categories and a lot of small species. High-quality carbon agent generally refers to the graphitization of the carbon agent in the high temperature conditions, the arrangement of carbon atoms in the micro-morphology of graphite, so called the graphitization.Graphitization can reduce the amount of impurities in the carbon agent, increase the carbon content of the carbon agent, reduce the sulfur content.

The use of carbonizers in the casting can significantly increase the amount of scrap steel, reduce the amount of pig iron or no use pig iron. Electric furnace smelting of the feeding method, the carbon agent should be with the scrap and other materials together to put in place to prevent excessive oxidation, making the effect of carbon agent is not obvious and cast carbon content is not enough. The amount of carbon agent added, according to the ratio of other raw materials and carbon content to be set. Different types of cast iron according to the need to choose different types of carbon agent.The characteristics of the carbon agent itself choose pure carbon-containing graphitizing substances, reduce excess impurities in pig iron, the choice of carbon agent can reduce the cost of casting production.