For cast steel or foundry industry of electric furnace smelting, the use of low sulfur, low nitrogen, high absorption rate carburizer is the core of carburizing technology.
Graphitized petroleum coke recarburizer is the main production areas of Liaoning, Tianjin, Shandong and so on.
Liaohe oilfield is the producing area of low sulfur crude oil in the world, and graphitized petroleum coke has the lowest sulfur and nitrogen content.
The porosity of recarburizer also plays an important role in the effect of recarburizer and the absorption rate of recarburizer.
Through the production process, the pores of the oil coke recarburizer are all opened, so that the specific surface area of the recarburizer is maximized, the product has super permeability, can be quickly dissolved in molten steel, so as to maximize the absorption rate and carburizing efficiency.
According to different uses of recarburizer, different raw materials, there are many kinds of raw materials and different production processes, such as wood carbon, coal carbon, coke, graphite, etc., which have many small kinds, a wide variety.
High quality carburizing agent generally refers to graphitization carburizing agent.
The arrangement of carbon atoms at high temperature is arranged in the microscopic form of graphite, so it is called graphitization.
Graphitization can reduce the content of impurities in carburizing agent, increase the carbon content of carburizing agent, reduce sulfur content.
The use of carburizing agents in castings can greatly increase the amount of scrap, reduce the amount of pig iron or do not use pig iron.
In electric furnace smelting of feeding way, should join carburizer and scrap steel and other ingredients, and can choose small doses are added to the surface of molten iron, but should avoid a large number of feed into the molten iron, in order to prevent excessive oxidation, carbon content of castings, casting carbon content is not obvious, according to the ratio of other raw material and carbon content to determine the amount of recarburizer.
Different types of cast iron, according to the need to choose different types of recarburizer.
The characteristics of recarburizer itself is the choice of pure graphitized materials containing carbon, in order to reduce excessive impurities in pig iron, the appropriate choice of recarburizer can reduce the production cost of castings.
Carburizing agent is suitable for induction furnace smelting, but its specific use varies according to technological requirements.
The carburizing agent used in medium frequency electric furnace smelting can be added to the middle and lower part of electric furnace according to the ratio or carbon equivalent requirements, and the recovery rate can reach more than 95%.
If the amount of carbon is not enough to adjust the carbon content, first clean the slag in the furnace, and then add carburizer, by heating molten iron, electromagnetic stirring or artificial stirring to dissolve and absorb carbon, the recovery rate can reach about 90%.
If the low temperature recarburizer process is used, that is, the charge only melts part of the molten iron, and the molten iron temperature is low, all the recarburizer will be added to the molten iron at the same time, while the solid charge will be pressed into the molten iron, to prevent its exposure to the surface of the molten iron.
By this method, the carburization of molten iron can reach more than 1.0%.
Petroleum coke recarburizer can be used for casting gray cast iron.
The composition is generally carbon: 96-99%;
S0.3-0.7%.
Mainly used in steelmaking, gray cast iron, brake pads, cored wire, etc.
Henan Liugong Graphite Co., Ltd., calcined petroleum coke recarburizer graphitization recarburizer manufacturer, to introduce you calcined petroleum coke is calcined petroleum coke recarburizer, the purpose is mainly to remove impurities, and calcined petroleum coke recarburizer graphitization into graphitization recarburizer, to remove sulfur, water and volatients.
Post time: May-14-2021