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High-efficiency carbon-reinforcing agent refers to a high-carbon low-sulfur recarburizer, which is actually a graphitic recarburizer of petroleum coke. The recarburizer of petroleum coke is mainly divided into three categories: calcined coke after calcination, and high temperature. Calcined graphitized petroleum coke, the third is semi-graphitized petroleum coke, the degree of calcination is between the two, and the price is also different depending on the degree of calcination.

Foshan Yoshida semi-graphitized petroleum coke recarburizer indicators are as follows:
Moisture (Mad) /% ≤0.5 GB/T211-2007
Ash (A)/% ≤0.8 GB/T212-2008
Volatile matter (V) /% ≤ 0.8 GB/T212-2008
Fixed carbon (FC) /% ≥ 98 indirect carbonization method GB/T212-2008
Nitrogen (N) /% ≤ 0.2 Oxygen and nitrogen analyzer GB/T214-2007
Sulfur (SI) /% ≤0.3 sulfur analyzer GB/T30733-2014
Particle size Remarks: 0-1mm 0-2mm 0-3mm 0.5-2mm 2-8mm 8-30mm (produced according to customer requirements)

Foshan Yoshida Graphitized Petroleum Coke Recarburizer Index is as follows:
Moisture (Mad) /% ≤0.5 GB/T211-2007
Ash (A)/% ≤0.8 GB/T212-2008
Volatile matter (V) /% ≤ 0.8 GB/T212-2008
Fixed carbon (FC) /% ≥98.5 Indirect carbonization method GB/T212-2008
Nitrogen (N) /% ≤0.03 Oxygen and nitrogen analyzer GB/T214-2007
Sulfur (SI) /% ≤0.05 sulfur analyzer GB/T30733-2014
Particle size Remarks: 0-2mm 1-5mm 8-30mm (produced according to customer requirements)

These are indicators and particle sizes for regular production and supply. The price of recarburizers also varies according to the market. Therefore, if you want to know the latest high-efficiency recarburizer prices, please contact us!

Zhaoqing Gaoyao District Hardware Machinery Parts Factory. The factory is located in Zhaoqing City, Gaoyao District, Lingnan City, Lingnan City, more than 20 kilometers away from Zhaoqing City, adjacent to Gaoming District of Foshan City. The transportation is convenient and the geographical position is very superior. We are willing to cooperate with colleagues from all walks of life to seek common development and continue to provide the best products and services for new and old customers. Our main production, processing and sales: pig iron casting HT150-HT350, ductile iron QT500-QT700. The products use clay sand, resin sand, and medium frequency induction furnace furnace casting process. Use pre-furnace carbon-silicon analytical instruments to ensure product quality. With the principle of multi-variety management and the principle of small profits but quick turnover, the company has won the trust of customers. The factory always pursues the enterprise tenet of “Honesty, Truth, Service, and Satisfaction”, and fully follows the needs of customers and continuously carries out product innovation and service improvement.

The Casting Workshop of Guangzhou Diesel Engine Co., Ltd. is the strongest casting production base in South China and has passed ISO certification. Pingyuan County Hengming Automobile Chassis Manufacturing Co., Ltd. is a famous trademark enterprise in Guangdong Province and has passed ISO quality system certification.is the result of a strong alliance. On the basis of the integration of the original technology and management, the company has increased its investment in production equipment. The company's main production equipment: 5 tons, 20 tons of resin sand production line, 1.5 tons, 10 tons of medium frequency melting furnace each 2 Taiwan, 7 tons, 12 tons of each holding furnace, large shot blasting equipment, large annealing, normal furnace. The inspection equipment includes: pre-furnace carbon silicon analyzer, thermometer, electronic scale, sand analysis equipment, physical and chemical analysis equipment, metallography, and spectral analysis. The company mainly produces cast iron parts, including ductile iron, vermicular cast iron, alloy cast iron and ordinary gray cast iron. The industries involved include: large and medium-sized diesel engine castings, engineering machinery, hydraulic machinery, food machinery, machine tools, mold wind castings, etc., can be supplied according to customer requirements, rough and fine casting.

Production and manufacturing of machine tool castings, with advanced technology and experience, has won the trust and support of our customers. I have always used gray iron casting for machine tool castings. Why do I choose this material? What are the advantages?
Machine tool castings using gray iron casting materials:
1. Due to the large size of machine tool castings, the length can reach several meters; the quality can reach more than 10t, and the wall thickness is 15~30mm. The requirements are: good precision stability and shock absorption, high modulus of elasticity, suitable compressive strength, moderate hardness and excellent wear resistance;
2, the process requires good casting performance, has high resistance to deformation, and is easy to cut, and requires lower production costs, such as melting with a cupola, using a smaller amount of alloying elements.
3. China's gray iron casting machine tool castings generally use HT250 and HT300 to inoculate iron castings as materials. In order to improve the service life of the machine tool, various alloy cast irons such as P-Cu-Ti cast iron, Cr-Mo-Cu cast iron and V-Ti cast iron are widely used.
4, gray iron casting machine tool casting process is more durable, casting performance is better, not only practical, the price is relatively more affordable, so our company has continued to use gray iron casting castings.
In addition to machine tool castings, gray cast iron is also commonly used as casting material for various basic platforms. The main products are cast iron platform plate, test platform, iron floor, coordinate measuring platform, T-slot assembly platform, inspection and marking platform, T-slot ground rail. , machine tool castings, etc. These cast iron platform products are widely used in machinery manufacturing, aerospace, automotive manufacturing, high-speed rail, wind power, electric motors, engine manufacturing and so on.

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The recarburizers based on petroleum coke mainly include carbon 98 calcined petroleum coke recarburizer and carbon 99.5 graphitized petroleum coke recarburizer. The price difference between the two recarburizers is relatively large, and some customers need a compromise choice. There is a semi-graphite recarburizer. Different recarburizers vary in price depending on the carbon and sulfur content. Customers in need can contact the latest recarburizer prices.

Foshan Jitian Foundry Materials Co., Ltd. also supplies the above three kinds of recarburizers. The specific indicators are as follows:

Carbon 98 calcined petroleum coke recarburizer:
Fixed carbon ≥98 Indirect carbonization method Q/HSLHHZSH 1001-2017
True density / g / cm3 ≥ 2.03 YS / T 587.9
Powder resistivity / uΩ. m ≤600 YS/T 587.6
Ash/%(m/m) ≤0.28 YS/T 587.1
Sulfur content /% (m / m) ≤ 0.7 GB / T 214
Moisture (customer requirements) /% (m / m) ≤ 0.5 YS / T 587.2
Particle size Remarks: 0-1mm 0-2mm 1-3mm 1-5mm 8-30mm (produced according to customer requirements)
         
Carbon 99.5 Graphitized Petcoke Recarburizer:
Moisture (Mad) /% ≤0.5 GB/T211-2007
Ash (A)/% ≤0.8 GB/T212-2008
Volatile matter (V) /% ≤ 0.8 GB/T212-2008
Fixed carbon (FC) /% ≥98.5 Indirect carbonization method GB/T212-2008
Nitrogen (N) /% ≤0.03 Oxygen and nitrogen analyzer GB/T214-2007
Sulfur (SI) /% ≤0.05 sulfur analyzer GB/T30733-2014
Particle size Remarks: 0-2mm 1-5mm 8-30mm (produced according to customer requirements)
              
Carbonized semi-graphitized Petcoke carbonizer:
Moisture (Mad) /% ≤0.5 GB/T211-2007
Ash (A)/% ≤0.8 GB/T212-2008
Volatile matter (V) /% ≤ 0.8 GB/T212-2008
Fixed carbon (FC) /% ≥ 98 indirect carbonization method GB/T212-2008
Nitrogen (N) /% ≤ 0.2 Oxygen and nitrogen analyzer GB/T214-2007
Sulfur (SI) /% ≤0.3 sulfur analyzer GB/T30733-2014
Particle size Remarks: 0-1mm 0-2mm 0-3mm 0.5-2mm 2-8mm 8-30mm (produced according to customer requirements)

The predecessor of Foshan Chanshan Foundry Co., Ltd. is Foshan Foundry with a history of nearly 50 years. Up to now, our company has a complete range of casting processes including resin sand, dry sand, tidal sand, synthetic sand, water glass sand and gypsum sand, and a group of more advanced casting production and testing equipment and a The experienced team of design, management and production is very adaptable. The product range includes: HT150~HT300 gray cast iron parts; QT400~QT700 ductile iron parts; special alloy castings; copper and aluminum alloy castings and various handicraft castings with different materials; BS standard series ductile iron pipe fittings; Rod type elastic gate valve; pneumatic rotary riveting machine series; various light and heavy security anti-theft manhole covers. The products are mainly exported and exported to Europe, America, Australia, Japan, Hong Kong, Taiwan and Southeast Asia. On the basis of new planning and expansion of production sites, and the introduction of a large number of advanced equipment, the annual production capacity of various grades of gray cast iron parts, ductile iron parts, copper and aluminum castings exceeds 10,000 tons.

Foshan Jinda Technology Co., Ltd., formerly known as Foshan Nanhai Jinda Precision Casting Co., Ltd., founded in 1995, is located in the Pearl River Delta, with convenient communication and transportation. The company is specialized in stainless steel, alloy steel and carbon steel. The main investment in precision casting and machining as one of the enterprises. The introduction of a full range of automated and semi-automated production equipment and the entire line of silica sol process production, to meet higher dimensional accuracy and surface quality requirements. We have a complete production line, including mold making, investment casting, machining and product assembly to meet the requirements of customer finished products. The products are mainly exported to Europe, America, Japan, Singapore, etc., and have established long-term friendly cooperative relations with customers.

Foshan Nanhai District Dali Xiebian Yongsheng Hardware Foundry is located in Dali Town, Nanhai, Foshan, the hometown of non-ferrous metals in China. It started in 1986 and started from the traditional hand-made copper processing. It has been more than 20 years old. The company has been engaged in the foundry of copper and aluminum for many years. It is a professional design and manufacturing enterprise for gravity casting and copper-aluminum casting. Our factory has many years of experience in aluminum die-casting and gravity casting. It is equipped with advanced casting, heat treatment and machining equipment. It adopts advanced technology and complete testing methods. It has a high-quality technical and management team and a perfect quality assurance system. . Mainly used in aluminum alloy sand casting, gravity casting, pressure casting, low pressure casting, precision casting and other casting processes, products related to mechanical parts, construction hardware, auto parts, pneumatic components, press parts, household items, public space leisure facilities and other related fields . Our factory can also produce and supply castings or finished products of various materials and models according to customer requirements, and produce heat-resistant alloy steel and wear-resistant alloy steel of various material specifications, high temperature, high pressure, high chromium high nickel alloy steel, special Steel casting and other products. Other customized products include: high temperature resistant castings, centrifugal casting tubes, precision castings, industrial furnaces, heat treatment furnace castings, heat resistant castings, wear resistant steel castings, stainless steel fittings, hardware tools, auto parts, marine and building structural parts, etc. .

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20181028 This week, China's carbon-reducing agent market was stable, and the low-grade recarburizer market was affected by the weak downstream trend. The price was difficult to break through, and the inventory of individual enterprises was high. The medium and high grade recarburizers were raised by the price of raw petroleum coke. Impact, corporate cost pressures increase, but limited by downstream acceptance, the price increase process is more difficult to promote, some companies raise prices, mainstream prices rose. Near the heating season, local production restrictions policies are clear, Jiangsu, Hebei, Tianjin and other places have been introduced one after another, production enterprises may be limited or not, and downstream operations have been maintained at low levels.

General calcined coal recarburizer:
This week, the mainstream price of China's general calcined recarburizer market is stable, and the market is generally trading. Downstream enterprises are affected by many factors such as environmental protection and market. The general conditions of operation are relatively stable, the demand side is relatively stable, the downstream receiving mentality is weak, the market price is stable, and there is a downward intention. Production: Ningxia area in the main producing area is currently in normal production, enterprises have more inventory, environmental inspection and acceptance work is in progress, subject to environmental protection strict inspection of the heating season, heavy pollution weather control, market start-up may be limited, stimulating prices. The production of enterprises in North China is normal, but the reaction starts low, the market is generally trading, and the enterprises have inventory.

Downstream: Domestic construction steel prices have risen slightly this week. Weekly inventory decreased significantly, and the steel billet pulled up, and the supply and demand pattern still supported the market. It is learned from the market that the market price has basically maintained an upward trend in the first three days of this week. However, as the snails fell, the trading volume began to fall, and the market mentality returned to the sidelines. "Silver 10" has been more than half. So far, the work before the heating season has not yet fully started, and the market is still based on shock operation. Considering comprehensively, it is expected that the short-term building materials market will rise slightly, within the range of 50 yuan.

Calcined coke recarburizer:
This week, the mainstream price of China's calcined coke market is stable, the price of raw materials is rising, and the production cost of enterprises is high. However, in view of the environmental impact of downstream enterprises, the low starting price, the demand for carbon-reducing agents is relatively stable, and the market is generally trading, but it is subject to cost pressure. Driven, individual companies offer up. Medium-high sulfur calcined coke: This week, the market for high-sulfur calcination coke was stable, and the market price of calcined coke in the market with a sulfur content of 1.5% was increased recently. In terms of production, this week's calcined coke enterprises started to fluctuate less, and most of them are under normal production.

Graphitized petroleum coke recarburizer:
This week, the market price of China's graphitized petroleum coke recarburizer increased. Mainly due to the rising price of raw material petroleum coke, the price is high, and the pressure on the production cost of recarburizer is increasing. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate declined. The enterprises in Jiangsu, Tianjin and Inner Mongolia started to work stably, but the heating season policy was released one after another, and the market heating season may be limited. In addition, the graphitization enterprises of anode materials in the market started to work one after another, and the output was released. Graphitization and recarburizers are highly concentrated in Inner Mongolia. Enterprises in Jiangsu Province have normal production, good shipments and smooth exports.

Forecast: The market for low-grade recarburizers is temporarily stable, and the market needs to consume inventory. Enterprises mainly rely on the implementation of fixed orders. The medium and high grade recarburizer market enterprises may start to work or will be limited. In addition, the raw material prices are high. Even if the downstream acceptance is weak, the cost pressure will push the market price to rise.

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Graphitized Petroleum Coke Recarburizer 2-8mm SGS Test Report Fixed Carbon 98.67 Sulfur 0.02 Nitrogen 0.03
Date: September 13, 2018

Moisture: 0.16 %
Ash: 0.14 %
Volatile matter: 1.03 %
Fixed carbon: 98.67%
Total sulfur: 0.02 %
Nitrogen: 0.03 %

High-efficiency graphite recarburizer produced by Foshan Yoshida Foundry Materials Co., Ltd. has high carbon content, low sulfur content, bright color, light specific gravity, uniform particle size and uniformity, small ash content, and can be added at the bottom of the furnace or added with the charge. Easy to melt and easy to absorb, and does not produce floating impurities, the unit cost of carbon is lower. Applicable to large, medium and small cupolas and electric furnaces, widely used in scrap iron making, ductile iron casting, steel making and other industries. The particle size of Foshan Jitian graphitized recarburizer is 1-5mm, 8-30mm, sulfur 0.05;

Published in 2018

20181019 This week, the mainstream price of China's Recarburizer market is stable, the low-grade Recarburizer market is generally trading, the company's inventory is high, and the medium and high Recarburizer market is better. The heating season is just around the corner, the downstream steel mill's production restriction policy is clear, the company's operating rate is low, and the receiving sentiment is relatively dull. The Rebondurizer market price is generally stable and the possibility of deposit and loss is high. The prices of raw materials in the medium and high-grade Recarburizer market were generally raised after the holiday, and the cost pressure of production enterprises increased. However, due to the limited acceptance of the downstream market, the company's quotation has not been raised.

At present, the main materials of Recarburizer are coal and petroleum coke. The petroleum coke is divided into ordinary calcined Recarburizer and graphitized Recarburizer because of the degree of calcination. After years of tempering in the market, the petroleum coke Recarburizer has gradually replaced the market position of coal-based Recarburizer, and the shipment volume is relatively high.

Calcined Recarburizer:
This week, the mainstream price of China's general calcined Recarburizer market remained stable, and the overall market shipments were generally due to the general consumption of downstream steel mills, and the demand was relatively light. Most of the recalcinated Recarburizer manufacturers are electric calcined anthracite enterprises, self-produced screening, and the environmental protection facilities of the local enterprises in the main producing area are undergoing the inspection and acceptance of environmental protection facilities. If the enterprises fail to meet the standards or restrict production, the market starts will be limited. The production of enterprises in North China is normal, but the reaction starts low, the market is generally trading, and the enterprises have inventory.

Downstream: China's construction steel prices are trading strongly this week. Recently, in the environmentally-friendly production and the leading regions, the stock market digested and enlarged, coupled with the decrease in the shipments of the leading steel mills, the stronger willingness to price, and the support of the construction steel market continued to rise. It is understood that the Ministry of Housing and Urban-Rural Development said that all localities should take effective measures to speed up the progress of construction, increase the construction of supporting infrastructure for sheds, and the terminal demand is still acceptable. However, as the price gradually increases, the terminal transaction will gradually decrease, and the market risk preference will be lower. The high price of the willingness to accept is relatively limited, which is not conducive to the sharp rise in prices. Coupled with the recent snail and steel billet red and green intertwined, resulting in a turbulent mentality in the building materials market, traders are cautious, and the atmosphere is strong. Market outlook: It is expected that the short-term building materials market will fluctuate and strengthen, with a range of 50 yuan/ton.

Calcined Petroleum Coke recarburizer:
This week, the price of China's calcined coke Recarburizer is stable, the raw material price is high, and the production cost of the enterprise is high. However, in view of the environmental impact of the downstream enterprises, the low-level operation, the demand for Recarburizer is relatively stable, the market is generally trading, the late heating season is coming, the calcined coke Prices may fluctuate due to limited production, etc., affecting Recarburizer shipments, or will benefit other quality Recarburizer.

Medium and high sulfur calcined coke: This week, the medium and high sulfur calcined coke market was generally trading, the shipment was stable, the market was slightly weak, and the price of the coke was not adjusted. In terms of production, the production load of Zhaoxing carbon is increasing, and individual enterprises in Shandong Guangrao are not expected to reduce production. It is understood that the impact of this winter's limited production policy on calcined coke enterprises will be less than expected. A new carbon-fired enterprise in Shandong is expected to ignite four new calciners at the end of this month, and the monthly output is expected to increase by about 20,000 tons. There is no inventory backlog, and there is no pressure on the trading market of calcined coke. However, at the same time, after the production load of the enterprise is increased, coupled with the recent poor performance of the aluminum market, the price of domestic medium and high sulfur calcined coke at the end of the month is still at a downward risk, and the estimated range is about 50 yuan/ton. .

Graphitized petroleum coke Recarburizer:
This week, the price of China's graphitized petroleum coke Recarburizer is stable. The price of raw material petroleum coke is stable and the price is high. The pressure on the production cost of Recarburizer is increasing. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate fell. In addition, the graphitization enterprises of anode materials in the market will start construction in the second half of the year, and the output will be released. Enterprises in Jiangsu Province have normal production, good shipments and smooth exports.

Late prediction: The general market for recarburization of Recarburizer is currently trading, and the stock of enterprises is higher, but the price of raw materials for electric calcination may be lower due to limited production, which stimulates the price of Recarburizer; the price of calcined coke and graphitized Recarburizer is driven by cost. The pressure is increasing, and the price push is stronger.

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Name: Recarburizer / Carbon Additive

Type:
(1) Graphitized petroleum coke (high carbon & low S 0.05%)

(2) Semi Graphitized petroleum coke (high carbon & medium S 0.3%)

Fixed Carbon(%):98.5
Sulphur(%):0.05
Nitrogen(%):0.03
Ash (%):0.8
Moisture (%):0.5
Volatile Matter (%) :0.8
We manufacture different size, like 0-1mm 1-5mm, 8-30mm

And we also supply the semi graphitizec petroleum coke with the specifications as below:

Fixed Carbon(%):98
Sulphur(%):0.3
Nitrogen(%):0.2
Ash (%):0.8
Moisture (%):0.5
Volatile Matter (%) :0.8 

Size: 0-1mm, 05-1mm, 0-3mm, 1-3mm
the different with the graphitized petroleum coke is the fixed carbon, sulphur and nitrogen.

Acting as the inoculant and carburizer, it's widely used in the special steel smelting and precision casting process, especially meeting the requirement of high quality product and strict control of sulfur content in the ductile iron and grey iron casting industry.

Foshan Yoshida Casting Material Co.,Ltd. manufacture the Graphitized Petroleum Coke with the specifications as below:

Fixed Carbon(%):98.5
Sulphur(%):0.05
Nitrogen(%):0.03
Ash (%):0.8
Moisture (%):0.5
Volatile Matter (%) :0.8
We manufacture different size, like 1-5mm, 8-30mm

And we also supply the semi graphitizec petroleum coke with the specifications as below:

Fixed Carbon(%):98
Sulphur(%):0.3
Nitrogen(%):0.2
Ash (%):0.8
Moisture (%):0.5
Volatile Matter (%) :0.8
the different with the graphitized petroleum coke is the fixed carbon, sulphur and nitrogen.

The graphitized recarburizer is a graphitized petroleum coke, which processes the petroleum coke into a graphite by high temperature. This process is the energization of the petroleum coke and then the high temperature of 3000 degrees, so that the carbon molecular form of the petroleum coke is changed from an irregular arrangement. In a manner of evenly arranging the hexagonal squares, other impurities in the petroleum coke are also volatilized through this process, thereby obtaining graphitized petroleum coke having higher carbon purity and lower sulfur, and the petroleum coke can be better decomposed in the molten iron. in.

What is carbon additive? Carbon additive is a carbon or petroleum coke follow-up product of black or gray particles (or blocks) with high carbon content. The material is mainly coal and petroleum coke. The petroleum coke is divided into general calcined petroleum coke. (calcined coke or calcined coke) and graphitized petroleum coke. The carbon additive is used to reduce the oxygen content in the molten iron mainly during metal smelting and improve the mechanical properties of the casting. In the new synthetic cast iron smelting process, the amount of scrap steel used is greatly increased. By adding a carbon additive to adjust the carbon content of the molten iron, the production cost is greatly reduced while ensuring the quality of the molten iron.

Types of carbon additive

According to the existence form of carbon atoms, carbon additive can be divided into graphitized carbon additive and non-graphitized carbon additive. Graphitized carbon additive mainly includes graphitized petroleum coke and graphite electrode. Graphitized petroleum coke carbon additive is the most widely used in the foundry industry. The production process is to convert the raw material petroleum coke in a graphitization furnace through a high temperature of 2200-2600 °C, so that the carbon crystallization of the petroleum coke amorphous layer structure is transformed into The high-temperature heat treatment process of the three-dimensional ordered graphite crystal, that is, through the graphitization process, reaches the graphitization state. The non-graphitized carbon additive mainly includes: calcined petroleum coke, coal carbon additive, etc., calcined petroleum coke refers to petroleum coke heated at 1200-1500 ° C high temperature, the treatment temperature is low, and the crystal structure has not changed. Due to the high ash content and volatile matter, coal-based carbon additive is rarely used in electric arc furnace smelting. The indicators for measuring the quality of carbon additives are fixed carbon content, sulfur, volatile matter, ash, nitrogen content and water. After high temperature graphitization, the graphitized carbon additive has a much lower sulfur and nitrogen content than the non-graphitized carbon additive.

Carbon additive index: fixed carbon, ash, volatile matter

The fixed carbon of carbon additive is different from the carbon content. The fixed carbon value is calculated based on the moisture, volatile matter, ash and sulfur content of the sample, and the carbon content can be directly detected by the instrument. The fixed carbon content is high and the ash content is low, so the carbonization effect is better. The high ash content in the carbon additive generates a large amount of soot and slag during the smelting process, increases energy consumption, and increases the labor intensity of the slag.

Carbon additive index: sulfur

The sulfur content of ordinary calcined coke has a relatively high grade, generally less than 3% of sulfur to 0.1%, and the sulfur content of graphitized carbon additive is generally less than 0.05%. In ordinary cast iron, sulfur element has stable cementite and prevents the expansion of graphitization. In the production of ductile iron and vermicular graphite iron, a graphitized carbon additive with low sulfur content should be used. If the sulfur content is too high, the ball will be affected. The effect is to consume more spheroidizing agent and increase the production cost; the calcined petroleum coke carbon additive is used in the production of some gray iron castings because of the lower calcination temperature and higher sulfur content, generally less than 1%.

Carbon additive index: nitrogen content

Nitrogen content is an important indicator of the quality of carbon additive. In general, when the foundry purchases the carbon additive, the first is to pay attention to the price of the carbon additive; the second is the fixed carbon, sulfur, ash, volatile matter, and moisture content in the carbon additive, and less attention is paid to the nitrogen content. Ordinary calcined petroleum coke carbon additive, the calcination temperature is low, and the nitrogen and sulfur contents are high. When producing gray iron castings, the scrap steel itself will bring in a part of nitrogen. If the scrap is added in a large proportion, the amount of carbon additive will increase accordingly. If ordinary carbon calcined carbon additive with high nitrogen content is used, the molten iron is used in molten iron. The nitrogen content will increase significantly. Excessive dissolved nitrogen in the molten iron hinders graphitization, increases the stability of the carbide, promotes the formation of D-type graphite, improves the hardness, and deteriorates the processing properties of the casting.

For gray cast iron, the proper amount of nitrogen can shorten the length of the graphite sheet, increase the degree of bending, passivate the end, reduce the aspect ratio, stabilize the pearlite of the matrix, refine the grain structure and improve the tensile strength of the casting. And the role of hardness. According to the data, when the iron is N>0.012%, there is a possibility of nitrogen hole defects in the casting. Nitrogen pores are commonly found in the interior, surface or near surface of castings. They are round, rectangular and irregular in shape and are one of the common defects in casting production. The graphitized carbon additive is subjected to high-temperature desulfurization and denitrification treatment, and the content of nitrogen and sulfur is very low. The content of molten iron in the molten iron using graphitized carbon additive is generally low.

Factors affecting the absorption rate of carbon additive: The factors affecting the absorption rate of carbon additive are mainly the way of adding carbon additive, the chemical composition of molten iron, the temperature of molten iron, and the particle size of carbon additive.

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The recarburizer is mainly a calcined coal recarburizer, a calcined coke recarburizer and a graphitized petroleum coke recarburizer.
(2018.09.21) This week, the domestic carbon refining agent market started to be stable, with good trading, and the prices of all grades were stable. Due to the influence of many factors such as environmental protection and trade wars, the downstream steel mills are affected by many factors such as environmental protection and trade warfare. In general, the shipment of recarburizers is limited. In addition, while the enterprises are in environmental protection, the production is basically stable and there are some stocks. The price factor is small. The overall performance of the post-calcined coke recarburizer market was stable. The company said that although the price is high, the supply and demand side is relatively balanced, and the company is steadily moving forward; the graphitization and recarburizer market has raised the price of individual enterprises, the market is well shipped, and the production situation of the enterprise is relatively high. stable.

General calcined coal recarburizer
This week, the mainstream price of China's general calcined recarburizer market remained stable. The enterprises in Ningxia, the main producing area, started low, and the market supply was relatively stable. The 60th anniversary of the establishment of the autonomous region was a celebration of local transportation. The production in the North China market is stable and the environmental protection pressure is still relatively large. Downstream steel mills are affected by environmental protection, limited start-ups, relatively stable demand, and bearish prices for recarburizers.

The calcined coal recarburizer has a close relationship with the steel market. This week, domestic steel prices have been adjusted and operated steadily. The misunderstanding of the environmental protection policy has been revised. The Sino-US trade war has intensified. The NDRC has indicated that it will increase the infrastructure to fill the shortcomings. Zhenzhen expects long-term demand. In the short-term, the downstream demand performance is acceptable, the inventory is low, and the cost end support is strong. It is expected that the short-term domestic steel market will be consolidating.

Calcined coke recarburizer
This week, the mainstream price of China's calcined coke market remained stable, and the company started to recover more than before, mainly supported by the price of raw material petroleum coke, and the cost pressure was reduced. However, in view of the high price in the downstream market, the price intention is weak, the production enterprises are still shipping, and the price of the carbonizer has not yet fully fluctuated. In terms of petroleum coke, the petroleum coke index of Sinopec's refinery is basically stable, the shipment performance is acceptable, and there is no new change in the device dynamics. As the Mid-Autumn Festival and the National Day are approaching, the refinery's willingness to trade will increase, while the downstream enterprises will purchase more on demand. It is expected that the price of petroleum coke will remain stable in the short term. In addition, due to the upcoming winter heating season in Xinjiang, the downstream enterprises will increase their enthusiasm for receiving goods. Therefore, the petroleum coke in the northwest region is relatively better.

Raw materials: medium and high sulfur calcined coke: This week, the domestic medium and high sulfur calcined coke market was stable, and the coke price was unchanged from last week. This week, environmental protection has not affected the production of calcined enterprises in various regions. It is understood that at present, most of the calcined coke production enterprises are mainly engaged in the implementation of pre-contracts. For the time being, most of them have no inventory pressure. Recently, the downstream part of the contract has begun to reduce prices, and the price of petroleum coke still has downside risks.

Graphitized petroleum coke recarburizer
This week, the market price of China's graphitized petroleum coke recarburizer was stable, the price of raw material petroleum coke fell, and the cost pressure slowed down. Among them, the production of individual enterprises in Henan and Xinjiang was suspended due to environmental protection, and the operating rate fell. In addition, the graphitization enterprises of anode materials in the market will start construction in the second half of the year, and the output will be released. Graphitization and recarburizers are highly concentrated in Inner Mongolia. Enterprises in Jiangsu Province have normal production, good shipments and smooth exports.

Forecast of the market outlook: the price of raw material per-calcined coal will rebound in September due to the limited price of environmental protection acceptance enterprises, and the price of general calcined carbonizer will develop in a stable-up mode. Among them, the price of calcined coke and graphitized recarburizer is driven by cost, and the price may rise.

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In the process of iron and steel smelting, if the carbon content in the molten iron is not improved well, it will affect the quality of the steel and increase the cost of smelting and casting. In order to ensure the quality of steel casting, the quality of smelting can be improved by increasing the amount of smelted pig iron, but the raw iron of pig iron is relatively high. When using a recarburizer, it is not necessary to put too much pig iron. It is possible to increase the carbon content in the molten iron.

At present, there are many materials for cast iron recarburizers on the market. In general, coal quality recarburizers, petroleum coke recarburizers, calcined petroleum cokes, graphitized petroleum coke recarburizers and artificial graphite can be used as cast iron smelting. Recarburizer used. Although these products can be used as recarburizers, you must choose the right recarburizer when you buy them. If the quality of the products to be cast is high, you need to choose artificial graphitized petroleum coke recarburizer.

If the quality of the smelting metal is not high, you can choose a lower cost recarburizer. For example, in converter smelting, when high carbon steel is used, you can use petroleum coke with a lot of impurities as a recarburizer. However, the requirements for the recarburizer for the top-blown converter steelmaking are higher than the carbon of the fixed furnace recarburizer. The ash, volatiles, sulfur, phosphorus, nitrogen and other impurities are also required to be high in content, and are required to be dry, clean, and granular. Moderately, it is necessary to choose a calcined coke recarburizer and a graphitized recarburizer.

Among them, the most used mainstream carbonizers specifications are: fixed carbon C ≥ 98%, volatile matter ≤ 1.0%, sulfur content ≤ 1%, moisture ≤ 0.5%, particle size is more than 1-5mm, this recarburizer The indicator shows the calcined petroleum coke recarburizer, which is calcined petroleum coke. In the past, in the domestic smelting industry, relatively low-end non-graphitizing recarburizers were generally used. With the improvement of product quality and upgrading, more and more enterprises using graphitized petroleum coke in China will increase carbonization of graphitized petroleum coke. The indicators of the agent are: fixed carbon C ≥ 98.5%, volatile matter ≤ 0.5%, sulfur content ≤ 0.1%, moisture ≤ 0.5%, particle size between 0-5mm.

Different types of recarburizers are used differently. In the process of selecting a recarburizing agent for steel making, the particle size should be moderate, the particle size is too fine to be easily burned, and when it is too coarse to be added, it floats on the surface of the molten steel and is not easily absorbed by the molten steel. With the development of the market, the quality requirements of steelmaking refining agents are getting higher and higher, especially the conversion from coal quality carbonizers to calcined petroleum coke recarburizers, or graphitized petroleum coke recarburizers. .

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