Carbon Additive( Carbon Raiser) is an indispensable additive in iron and steel smelting. Its use can save a lot of iron ore usage, increase the usage of scrap steel and scrap iron, reduce production costs, and save non-renewable resources. In other words, the use of carbon additive can not only increase the carbon content in the steel but also reduce the sulfur content in the steel, which is a multi-purpose additive.
Carbon additives are divided into carbon additives for steelmaking and cast iron, and some other additives are also useful for carbon additives, such as additives for brake pads, as friction materials. The carbon additive belongs to the additional raw material for steelmaking and ironmaking. A high-quality carbon additive is an indispensable auxiliary additive for the production of high-quality steel.
The carbon additive belongs to the additional raw material for steelmaking and ironmaking. High-quality carbon additive is an indispensable auxiliary additive for the production of high-quality steel. With the same chemical composition, using different smelting processes, different ingredients, and ingredient ratios, the metallurgical quality of molten iron is completely different. To obtain a good carburizing effect, the electric furnace adopts the carburizing technology, and the cupola adopts the high-temperature precision casting technology.
Three Influences of Carbon Additives on Precision Casting Products
- Under the condition of high carbon content, in order to obtain high-strength gray cast iron castings, the smelting process adopts the process of all scrap steel and carbon additives, so that the molten iron is purer and the casting materials produced have high performance.
- The molten iron carbonization technology, especially in the electric furnace smelting process, can increase the graphite nuclei and reduce the oxidation of the molten iron.
- Carbon increase is the best measure to prevent or reduce shrinkage tendency. Due to the effect of graphitization expansion in the solidification process of molten iron, good graphitization will reduce the shrinkage tendency of molten iron.
Selecting Suitable Carbon Additive can Reduce the Production Cost of Casting
The use of carbon additives in casting can greatly increase the amount of scrap steel and reduce the amount of pig iron or do not use pig iron. In the feeding method of electric furnace smelting, the carbon additive should be put in together with the charge such as scrap steel, and a small dose can be added to the surface of molten iron. However, it is necessary to avoid feeding molten iron in large quantities, so as to prevent excessive oxidation, resulting in an insignificant carbon increase effect and insufficient carbon content in castings. The amount of carbon additive added is determined according to the ratio of other raw materials and the carbon content. For different types of cast iron, choose different types of carbon additives according to your needs.
The characteristics of carbon additive itself choose pure carbon-containing graphitized substances to reduce excessive impurities in pig iron. The proper selection of carbon additives can reduce the production cost of castings.