Steelmaking recarburizer for casting, cast iron, cast steel, cast will have a requirement for carbon, then recarburizer just as its name implies is to increase the carbon content in liquid iron, and, for example, commonly used in smelting furnace charge for pig iron, scrap steel, back to the furnace charge, iron carbon content is high, but relatively scrap purchase price is higher section, so adding scrap supply, reduce the quantity of pig iron, add recarburizer, can have certain effect to reduce the casting cost.
Below by yu da energy conservation for you to introduce.
In the process of smelting, the carbon content of steel does not meet the requirements of the top period due to improper mixing or charging and excessive decarbonization, etc. At this time, carbon is added to the steel solution.
Common carbon - increasing agents are carbon - increasing pig iron, electrode powder, petroleum coke powder, charcoal powder and coke powder.In converter smelting, high - carbon steel, the use of oil coke containing few impurities as a carbonizing agent.
The requirements for the top blown converter steelmaking use of the carburizer are high fixed carbon, low ash, volatile and sulfur, phosphorus, nitrogen and other impurities, and dry, clean, moderate particle size.
Recarburizer is suitable for smelting in induction furnace, but its application is different according to the technical requirements.
(1) in the smelting process of medium-frequency electric furnace, the use of carbon intensifier can be added to the lower part of the furnace with the material in accordance with the requirements of proportion or carbon equivalent, and the recovery rate can reach more than 95%;
(2) if the lack of carbon adjustment, the first dozen net furnace slag, plus carburant, by raising the temperature of molten iron, or artificial electromagnetic stirring to dissolve carbon absorption, the recovery rate is around 90%, if the low-temperature carbonization process, the melt furnace charge only part of the molten iron liquid under the condition of low temperature, all recarburizer one-time in liquid iron, at the same time with solid charge to press it into the liquid iron don't let it show liquid iron surface.
This method can increase the carbon content of iron liquid by more than 1.0%.
Graphitized Petroleum Coke 0.2-2mm carbon additive
Date: July 02, 2018
Volatile Matter: 0.93%
Fixed Carbon: 98.90%
Calcined petroleum coke is a kind of petrochemical product, whose raw materials is green petroleum coke.
It is widely used to produce graphite electrode, graphite blocks, brakes pads and other carbon products.
It’s also be used as carbon additive in some steel and aluminum plants.
Graphitized Petroleum Coke 1-5mm carbon additive
Date: June 29, 2018
Volatile Matter: 0.99%
Fixed Carbon: 98.32%
The main application of calcined petroleum coke is in the production of anodes for the Aluminum Smelting process. 70 - 80% of calcined petroleum coke is for the Aluminum Industry. The reason for use in the Aluminum Industry is for conductivity.
Another use for calcined petroleum coke is TiO2 production which accounts for about 15% of the CPC consumption. The reason for use in TiO2 is for its oxidizing effect.
Graphitized Petroleum Coke 1-5mm carbon additive
Date: June 11, 2018
Volatile Matter: 0.53%
Fixed Carbon: 98.97%
Calcined petroleum coke is a high purity carbon material produced by heating green petroleum coke to drive off moisture, volatile matter, and impurities and to increase its electrical conductivity, which is used to improve the carbon content in steel-making and ductile iron foundry. It is widely used to produce graphite electrode, graphite blocks, brakes pads and other carbon products. it can also be used as carbon additive in some steel and aluminum plants, another, it is used in refractory, insulation, filler,etc. We can supply different grades of Calcined Petroleum coke.
In recent years, more and more factories use the induction electric furnace for cast iron, but usually only the metal material can not keep the carbon content in iron, so that's why it need the recarburizer. For the induction electric furnace, special the intermediate frequency furnace, adding the carbon material is important link for smelting.
1. Shoul choose the carbon additive(calcined petroleum coke) with low nitrogen
The usual nitrogen content in cast iron liquid is below 100 ppm. If the nitrogen content exceeds this concentration (150-200 ppm or higher), it is easy to cause cracks, shrinkage or loose defects in the casting, and thick-walled castings are more likely to occur. This is caused by an increase in the amount of recarburizer added when the proportion of scrap steel increases. Coke-based recarburants, especially bitumen coke, contain large amounts of nitrogen. The graphite graphite has a nitrogen mass fraction of 0.1% or less or a very small amount, and the pitch pyrolysis mass fraction is about 0.6%. If 2% of the recarburizer with a mass fraction of 0.6% nitrogen is added, this increases the nitrogen content by 120 ppm. A large amount of nitrogen is not only liable to cause casting defects, but also nitrogen can promote pearlite compaction, ferrite hardening, and strongly increase strength.
2. Ways to adding the recarburizer
The stirring of molten iron can promote carbon addition. Therefore, the medium frequency induction electric furnace with weak stirring force is much more difficult to increase carbon than the power frequency induction electric furnace with strong stirring power. Therefore, the medium frequency induction electric furnace has the carbonization speed and the melting rate of the metal charge The possibility.
Even in a power-frequency induction furnace with high stirring power, the carbon-increasing operation cannot be ignored. This is because, from the schematic diagram of the induction furnace melting, there is a stirring iron flow separated vertically in the induction furnace, and there is a dead angle near the furnace wall at the boundary. The graphite cluster which stays on the furnace wall and adheres cannot be melted into the molten iron without excessive temperature rise and long-term iron liquid heat preservation. Excessive heating of the molten iron and long-term heat preservation will increase the degree of supercooling of the molten iron and increase the tendency of the cast iron to become white. In addition, for medium frequency induction furnaces that generate a strong induced current near the furnace wall, if molten iron is drilled between the graphite clusters attached to the furnace wall, the drilled metal is melted during the next furnace smelting, resulting in erosion. And damage the furnace wall. Therefore, in the case where the proportion of scrap steel is high and the amount of recarburizing agent is added, it is necessary to pay more attention to the addition of the recarburizing agent.
The addition time of the recarburizer cannot be ignored. If the addition time of the recarburizing agent is too early, it is easy to adhere to the vicinity of the bottom of the furnace, and the recarburizing agent adhering to the furnace wall is not easily melted into the molten iron. On the contrary, if the joining time is too late, the timing of carbon increase will be lost, causing the smelting and heating time to be slow. This not only delays the time of chemical composition analysis and adjustment, but also may cause harm due to excessive temperature rise. Therefore, the recarburizing agent is preferably added little by little during the process of adding the metal charge.
The so-called recarburizer is to increase the content of carbon in the molten iron after it is added. Therefore, the fixed carbon content of the recarburizer must not be too low. Otherwise, to reach a certain carbon content, it is necessary to add a high carbon content. With more samples of recarburizer, this undoubtedly increases the amount of other unfavorable elements in the recarburizer, so that the ferrofluid can not obtain a better return.
Low levels of sulfur, nitrogen, and hydrogen are key to preventing the production of nitrogen holes in castings. This requires that the nitrogen content of the recharging agent be as low as possible. The other indicators of recarburizers, such as moisture, ash, and volatiles, the higher the amount of fixed breakage, so the high fixed carbon content of these harmful ingredients must not be high. For different smelting methods, furnace types, and sizes of smelting furnaces, it is also important to select an appropriate particle size of the carbon reductant, which can effectively increase the absorption rate and absorption rate of the recarburizer by the molten iron and avoid excessively small particles. Caused by oxidative damage to the breaker. The particle size is preferably: 100 kg furnace less than 10 mm, 500 kg furnace less than 15 mm, 1.5 tons furnace less than 20 mm, 20 tons furnace less than 30 mm. In the smelting of converters, when high-carbon steels are used, recarburizers containing little impurities are used.
The requirement for the recarburizer for top-blowing converter steelmaking is that the fixed carbon should be high, the content of ash, volatile matter and sulfur, phosphorus, nitrogen and other impurities should be low, and it should be dry, clean, and the grain size should be moderate. Its fixed carbon C> 97%, volatile matter <1.0%, S <0.5%, moisture <0.5%, particle size in l-5mm. The particle size is too fine to be easily burned, and it is too thick to float on the surface of the molten steel and is not easily absorbed by molten steel. The particle size of the induction furnace is 0.2-6mm, in which the steel and other ferrous metals have a particle size of 1.4-9.5mm, the high carbon steel requires low nitrogen, the particle size is 0.5-5mm, etc. The concrete need to be based on the specific furnace type smelting workpiece The details of the types and so on are specifically judged and selected.
Abstract: carbon additive, as its name implies, is used to increase the carbon content of iron melting or steelmaking. If it is formed by graphite powder, which can greatly increase the amount of scrap steel, reduce pig iron or do not use pig iron. Carbon additive can reduce casting cost to a certain extent.
The classification of carbon additive for casting can be divided into several different categories according to different classification criteria and standards.
1. According to casting purpose, it is divided into: nodular iron carbon additive, gray iron carbon additive, cast steel carbon additive, special carbon additive:
1.1 ball iron carburizing agent generally uses graphitized high carbon and low sulfur products, the basic requirements are: C>98.5, S<0.05; its main material is graphite fossil oil coke, graphite electrode and so on. It also has the highest absorption rate and fastest absorption time in carburizing agents.
1.2 the main technical index of gray iron carburizing agent and nodular iron carburizing agent is the control of sulfur. The general requirement is S<0.5, and C content can be selected according to the cost control requirements 98.5 95 93 90. The absorption rate of this kind of carburizing agent is about 85%. Its main material is non graphite fossil oil coke, calcined coal and so on.
1.3 cast steel type of carburizing agent is more complex. In general, large steel mills choose a variety of carburizing agents according to different kinds of steel, but the general material is calcined coal, or Shi Moqiu, and it is also useful for natural graphite. The content varies from 75-99.
1.4 special carburizing agents are mainly used for brake block manufacturing, core wire manufacturing, and 0-0.5 or 0.5-1MM granularity.
Carbon Additive 0-3mm
Date: March 16,2018
Volatile Matter: 0.67%
Fixed Carbon: 98.70%
|Graphited Calcined Petroleum Coke 0-2mm||
Calcined petroleum coke is a high purity carbon material produced by heating green petroleum coke to drive off moisture, volatile matter, and impurities and to increase its electrical conductivity, which is used to improve the carbon content in steel-making and ductile iron foundry. It is widely used to produce graphite electrode, graphite blocks, brakes pads and other carbon products. it can also be used as carbon additive in some steel and aluminum plants, another, it is used in refractory, insulation, filler,etc. We can supply different grades of Graphited Calcined Petroleum coke.
Foshan Yoshida Casting Material Co., Ltd. is a carbon material comprehensive industrial company integrating R & D, production and sales, and the main products are calcined petroleum coke, graphited calcined petroleum coke and other carbon additive products.
Afterwards, through crushing, screening and classification, we supply our users with the different particle size as the customers' request like 0-1mm, 1-3mm, 1-5mm, 8-30mm and more, alos the specifications.
Thank you for your patient reading! We welcome your inquiry.
In order to serve you best and save your time, sending specifications technical data of the goods you are looking for is warmly welcomed. ( fixed carbon, sulphur, ash, etc)
Contact: Owen Zhang
Mobile： +86 182 1805 1155
Wechat: 182 1805 1155
Whatsapp: +86 182 1805 1155
Add: Room 329,Zinji City building, Xiaxi, Guicheng, Nanhai, Foshan, Guangdong, China
Calcined Petroleum Cokes packing with:
1.Small bag:25kg kraft bag or PP bag.
2.Big bag: 1000kg Jumboo bag
3.According to customer's requirements
Name: Owen Zhang
Mobile： 0086-182 1805 1155
Wechat: 182 1805 1155
Whatsapp: 0086-182 1805 1155
Add: Foshan, Guangdong, China