What Is A Recarburizer?

In addition to the often used name "carburizer" in the iron and steel smelting process of the metallurgical industry and the foundry industry, have people heard the name "recarburizer"? In the 1960s, the British foundry industry left crude oil refining from the residual scraps of graphite electrodes, which left no longer used residues, as well as those materials that could effectively affect the supply of foundries. Due to the scarcity of materials after the war, these materials After a certain technical treatment, it is reused, saving a lot of materials, and changing from inferior waste products to upgraded products. At that time, silicon carbide was gradually expanded from the metallurgical industry to the casting field under this historical background. SiC entered the foundry market as a recarburizer. In principle, it is understood that compared with ferrosilicon, in terms of increasing Si function, it uses the silicon element in the product itself to increase the amount of Si in the molten iron. However, because SiC also contains a lot of carbon, it can be used for the carburizing operation of electric furnace smelting at the same time. When the added amount exceeds 2%, the carbon content of the melt is increased by more than 0.5%. When silicon carbide reaches this parameter level, it is called metallurgical grade silicon carbide. It is not formulated in the UK, metallurgical grade silicon carbide is smelted from relatively pure carbon in green petroleum coke in a high temperature furnace. It is a granular material with a crystal structure inside and a size of about 20mm. Metallurgical grade silicon carbide contains about 90% SiC, free Si: 0.5%, and free C: 3%. The main components of metallurgical silicon carbide are: silicon 63% ,carbon 30%, aluminum 0.35%, sulfide 0.02%~0.04%, oxide 0.025%~0.04%.