Recarburizer, also know as carbon additive, carbon raiser. It is a product for increasing the carbon element (C).
During the steel making process, various factors may cause the carbon content in the molten steel to decrease. This will affect the quality of the finished steel. So, steel mills usually purchase carbon reductants to cope with the decline in carbon emissions.
There are many types of recarburizers that are common. There are artificial graphite recarburizer, petroleum coke recarburizer, calcined coal recarburizer. Let's take a look at each of these three.
Synthetic graphite recarburizer
Graphite recarburizer is is a ferroalloy product made of carbon material.
Graphite carbon raisers are divided into natural graphite recarburizers and synthetic graphite recarburizers. The best quality is the synthetic graphite recarburizer. When smelting ductile iron, it is best to choose artificial graphite. The metallurgical quality of casting is better.
Synthetic graphite recarburizer specifications
|Synthetic graphite||1 max||0.3 max||0.5 max||98%||0.05 max|
Graphite carbon additive advantages
It has the characteristics of high fixed carbon content, low ash content, low sulfur content, low volatile content and less harmful impurities. It can make carbon absorption faster, absorption rate higher, no residue, and more stable carbonization effect.
Graphite carbon raiser production process
The main raw material for synthetic graphite is powdered smoldering petroleum coke. The asphalt is used as a binder and a small amount of other auxiliary materials are added. After the various raw materials are combined, they are compression molded. It is then treated in a non-oxidizing atmosphere at 2500-3000 ° C for graphitization.
The synthetic graphite products are expensive. Most of them used in the foundry industry is chips, scrap electrodes and graphite blocks when manufacturing graphite electrodes. These materials can be recycled. And in the production process to play a role in heating up and increasing carbon. At the same time, it can greatly reduce production costs.
Petroleum coke recarburizer
Petroleum coke recarburizer is a widely used carbon riser. Its combustion temperature is 1650-1730 degrees. Therefore, many manufacturers use it as a combustion improver. It is usually replaced by coal due to its high calorific value and low volatility.
Petroleum coke carbon raiser manufacturing process
The crude oil is distilled or vacuum distilled to obtain a residual oil and petroleum pitch. It is then coked to obtain the raw petroleum coke. Raw material petroleum coke has a high content of impurities. And can not be used directly as a recarburizer. So it is calcined to obtain a petroleum coke riser.
Petroleum coke carbon additive specifications
|petroleum coke||1 max||0.3 max||1 max||98.5||0.05-0.35|
Calcined coal recarburizer
Calcined coal carbon raiser specifications
|calcined coal||1 max||4-8||1 max||85-93||0.35 max|
The above are three commonly used carbon additve products. The common particle sizes provided by wanhua are 1-3mm,5-8mm and 3-8mm respectively. Of course, carbon additive manufacturers and suppliers can be customized to meet the needs of users.
The carbon additives are used in various applications such as cast iron and cast steel. However, the most widely used one is the steelmaking industry. Therefore, steel mills have corresponding procurement plans every month.
Wanhua Metal provides various kinds of carbon raisers. And the price is favorable and the quality is good. Quote now!