The main component of the calcined coke recarburizer is carbon, and its role is to increase the carbon content of ferroalloy smelting.
However, the quality of different recarburizers is not the same. The higher the carbon content, the lower the basic impurities. Another is the content of sulfur and nitrogen in the ferroalloy composition. The effect of sulfur is basically clear to many people, and it contains a certain amount in cast iron. The sulfur content can better update the physical properties of iterative castings. In recent years, the nitrogen content has also been extensively studied by everyone. Too high nitrogen content causes nitrogen pores. If the nitrogen content is too low, the hardness of the castings cannot rise.
The role of the calcined coke recarburizer is used to cast cast iron and cast steel. The castings have a requirement for carbon, so the recarburizer is used to increase the carbon content in the molten iron. Commonly used charge in smelting is pig iron, scrap steel, and reheat charge. The carbon content of pig iron is high, but the purchase price is higher than that of scrap steel. Therefore, increase the amount of scrap steel and add high-quality recarburizers, which reduces the amount of pig iron added, saves production costs, and satisfies the production cost.
But each batch of recarburizer is slightly different. Graphitized recarburizer generally refers to graphitized recarburizer. Under high temperature conditions, the arrangement of carbon atoms is in the microscopic form of graphite, so it is called graphitized recarburizer. Graphitization can reduce the content of impurities in the recarburizer, increase the carbon content of the recarburizer, and reduce the sulfur content, so the price is relatively high.
If the particle size of the recarburizer is too fine, it is easy to burn, and if it is too coarse, it will float on the surface of the molten steel and will not be easily absorbed by the molten steel. Aiming at the particle size of the induction furnace is 0.5-6mm, the particle size of steel and other ferrous metals is 1-8mm, the high-carbon steel requires low nitrogen, and the particle size is 1-5mm, etc. The specific needs are based on the specific furnace type smelting workpiece Specific judgment and selection of model and other details.