In the iron and steel smelting process, due to improper ingredients or improper loading and excessive decarburization, the carbon content in steel or iron sometimes fails to meet the expected requirements, and carbon is added to steel or molten iron. The main substances commonly used for carbon addition are anthracite powder, carbon-increasing pig iron, electrode powder, petroleum coke powder, pitch coke, charcoal powder and coke powder. The requirement for recarburizer is that the higher the fixed carbon content, the better, and the lower the content of harmful impurities such as ash, volatile matter and sulfur, the better, so as not to contaminate the steel.

The smelting of castings uses high-quality recarburizer after high-temperature burning of petroleum coke with little impurities. It is also the calcined coke that I often say, which is the most important part of the carbon-increasing process. The quality of the recarburizer determines the quality of the molten iron and determines whether it can achieve good graphitization. In short, reducing the shrinkage of the molten iron recarburizer plays a pivotal role.

In the smelting of the whole scrap electric furnace, the graphitized recarburizer is preferred. After the high-temperature graphitization of the rebcarurizer, the carbon atoms can be changed from the original disordered arrangement to the sheet-like arrangement, and the flake graphite can become the best of the graphite nucleus. The core is to promote graphitization. Therefore, in pursuit of high quality requirements, we should use a high-temperature graphitized recarburizer. Because of the high temperature graphitization treatment, sulfur is reduced by the generation of S02 gas. Therefore, the graphitized rebcarburizer has a very low sulfur content, w(s) is generally less than 0.05%, and better w(s) is even less than 0.03%. At the same time, this is also an indirect indicator of whether or not high temperature graphitization and graphitization are good. If the selected recarburizer is not subjected to high temperature graphitization, the nucleation ability of graphite is greatly reduced, the graphitization ability is weakened, and even if the same amount of carbon can be achieved, the result is completely different.

The so-called rebcarurizer is to increase the carbon content in the molten iron after the addition, so the fixed carbon content of the recarburizer must not be too low, otherwise it is necessary to add more than the high-carb recarburizer to achieve a certain carbon content. The sample, which undoubtedly increases the amount of other unfavorable elements in the recarburizer, does not allow the molten iron to obtain better yields.

The low content of sulfur, nitrogen and hydrogen is the key to prevent the formation of nitrogen pores in the casting, so that the lower the nitrogen content of the recarburizer, the better. Other indicators of recarburizer, such as the lower the amount of moisture, ash, and volatile matter, the higher the fixed amount of damage, so the high fixed carbon content, the content of these harmful components must not be high. It is also important to select the appropriate recarburizer particle size for different melting methods, furnace types and size of the melting furnace. It can effectively increase the absorption rate and absorption rate of the recarburizer by the molten iron, and avoid the increase due to too small particle size. The agent is oxidized and burned. The particle size is preferably: 100 kg furnace is less than 10 mm, 500 kg furnace is less than 15 mm, 1.5 ton furnace is less than 20 mm, and 20 ton furnace is less than 30 mm. In converter smelting, when high carbon steel is used, a recarburizer containing little impurities is used.

The requirement for recarburizer for top-blown converter steelmaking is that the fixed carbon is high, the ash, volatiles and sulfur, phosphorus, nitrogen and other impurities are low, dry, clean and moderately sized. 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 when it is too thick, it floats on the surface of the molten steel and is not easily absorbed by the molten steel. For the induction furnace, the particle size is 0.2-6mm, wherein 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., and the specific need to smelt the workpiece according to the specific furnace type. The specific types and details of the specific judgment and selection.

Graphitized Petroleum Coke 0-2mm

Date: April 28, 2018

Moisture: 0.09%

Ash: 0.46%

Volatile Matter: 0.94%

Fixed Carbon: 98.51%

Sulphur: 0.08%

Foshan Yoshida main products are: Calcined Petroleum Coke (Calcined Petcoke), Foundry Carbon Additive, Graphitized Carburant, Graphited Petroleum Coke and other carbon related products. The products are sold in more than ten provinces and cities such as Guangdong, Guangxi, Fujian, Hunan, Zhejiang, Jiangsu, Anhui, Shandong and so on, and are also sold to Germany, Turkey and Iran, Russia, Indonesia, South Korea and other countries and regions.

SGS test report Low Sulphur Calcined Petroleum Coke 0-3mm

Date: January 04, 2017

Moisture: 0.2%

Ash: 0.92%

Volatile Matter: 1.13%

Fixed Carbon: 97.81%

Sulphur: 0.16%

The use of calcined petroleum coke:

1.Steel Foundry: carburant/graphite electrode/refractory material
2.Industry Field: brake pad/seal ring/friction plate/heat exchanger/lubricity
3.Battery Production: alkaline battery cathode/lithium ion battery cathode
4.Metallurgy:casting for glass production/graphite crucible/ anodes for the aluminium, titanium smelting industry
5.Others:glass sheet/pencil lead/clay bricks/conductive coating

SGS report Low Sulphur Calcined Petroleum Coke 1-3mm

Date: March 07, 2016

Moisture: 0.31%

Ash: 0.67%

Volatile Matter: 1.03%

Fixed Carbon: 98.00%

Sulphur: 0.08%

1.Steel Foundry: carburant/graphite electrode/refractory material
2.Industry Field: brake pad/seal ring/friction plate/heat exchanger/lubricity
3.Battery Production: alkaline battery cathode/lithium ion battery cathode
4.Metallurgy:casting for glass production/graphite crucible/ anodes for the aluminium, titanium smelting industry
5.Others:glass sheet/pencil lead/clay bricks/conductive coating

Low Nitrogen Calcined Petroleum Coke specification 0-3mm
Date: September 22, 2015
Moisture: 0.06%
Ash: 0.94%
Volatile Matter: 0.89%
Fixed Carbon: 98.11%
Sulphur: 0.19%
Nitrogen: 0.04%

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. 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 petcoke and other carbon additive products. Our company was founded in November 2012, with strong technical strength, advanced production equipment, senior engineers and various professional workers.

Low Nitrogen Calcined Petroleum Coke 0-2mm
Date: July 29, 2015
Moisture: 0.07%
Ash: 0.66%
Volatile Matter: 0.91%
Fixed Carbon: 98.37%
Sulphur: 0.17%
Nitrogen: 0.04%

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. 

Calcined Petroleum Coke specifications 0-1mm SGS report
Date: July 13, 2015
Moisture: 0.1%
Ash: 0.56%
Volatile Matter: 0.70%
Fixed Carbon: 98.63%
Sulphur: 0.57%

Calcined Petroleum Coke(CPC) comes from delayed petroleum coke which extracted from oil refinery. Although Calcined Petroleum Coke contains a little bit higher level of sulfur and nitrogen than pitch coke, the price advantage still makes it widely used during steel-making and founding as a kind of carbon additive/carburant.