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Petroleum coke carbon addition agent can be added in iron liquid. However, the added amount should not exceed 0.2% at the later stage to avoid graphite bulky. The choice of carburizing agents must be of good quality and low nitrogen content. If iron contains low Ti, it is impossible.
And a large amount of nitrogen will be lost, which will result in a large number of pores due to N2's unclean. Good carburizing agent containing graphite and carbon.
In 95%~98%, the content of S is below 0.5%. N content in 500~4000ppm is a carburizing agent with poor quality. In short, silicon carbide and carburizer are two kinds of non-metallic materials used in cast iron, they have advantages and disadvantages.
On the one hand, careful selection and rational use are needed to achieve the desired effect of petroleum coke carburant processed by calcination and purification of petroleum coke, the appearance of which is round or polygonal. Its characteristics are high carbon.
Low sulphur and low ash are ideal carbon-adding materials and reaction intermediates in metallurgical, chemical, mechanical and electrical industries, and are widely used.
Petroleum coke carbon increasing agent is made from petroleum coke calcined and purified, and its appearance is round or multi prism. It is characterized by high carbon, low sulfur and low ash. It is an ideal carbon-adding material and reaction intermediate in metallurgical, chemical, mechanical and electric industries, and has been widely used.
Petroleum coke carburizer is made from calcined petroleum coke. As a good carbon additive and intermediate reactor, it is used in metallurgy, chemistry, machinery, electric power and other industries. It can be applied to the steel industry. 1. effect of carburizing particle size
The carburizing process of graphitized petroleum coke carbon additive includes dissolution diffusion process and oxidation loss process. The size of the carburizing agent is different, and the rate of dissolution and diffusion and the rate of oxidation loss are different. The absorption rate of the carburizer depends on the comprehensive effect of the dissolution and diffusion rate of the carburizer and the oxidation loss rate: in general, the carburizer particles are small, the dissolution rate is fast, and the loss rate is large; the carburizer particles are large, the dissolution rate is slow, and the loss rate is small. The size of the carburizing agent is related to the diameter and capacity of the furnace. In general, the diameter and capacity of the furnace is large, the particle size of the carburizer is larger; conversely, the particle size of the carburizer is smaller. The granularity of crystalline graphite is required to be 0.5-2.5 mm for electric furnace melting below 1 t, 2.5-5 mm for crystalline graphite for 1t-3 t, 5.0-20 mm for crystalline graphite for 3t-10 T and 0.5-1 mm for crystalline graphite for coating in ladle.
2. the influence of adding amount of carburizing agent.
Under certain conditions of temperature and chemical composition, the saturation concentration of carbon in molten iron is certain. The dissolution limit of carbon in cast iron is ([C%]=1.3+0.0257T-0.31 [Si%]-0.33 [P%]-0.45 [S%]+0.028 [Mn%] (T is molten iron temperature). At a certain saturation, the more the carburizer is added, the longer the dissolution and diffusion time is required, the greater the corresponding loss, and the lower the absorption rate.
3. effect of temperature on absorbance of carburant
From the point of view of kinetics and thermodynamics, the oxidation of molten iron is related to the equilibrium temperature of C-Si-O system, that is, O in molten iron reacts with C and Si. However, the equilibrium temperature varies with the target C and Si content. When the molten iron is above the equilibrium temperature, carbon oxidation takes precedence. C and O form CO and C O2. In this way, the oxidation loss of carbon in molten iron increases. Therefore, above the equilibrium temperature, the absorbency of carburizing agent decreases; below the equilibrium temperature, the saturated solubility of carbon decreases, and the dissolution and diffusion rate of carbon decreases, resulting in a lower yield; at the equilibrium temperature, the absorbency of carburizing agent is the highest.
4. the influence of iron stirring on the absorbance of carburant
Mixing is conducive to the dissolution and diffusion of carbon, so that the carburizing agent will be burned on the surface of molten iron. The stirring time is long and the absorption rate is high before the carburizing agent is completely dissolved. Stirring can also reduce the carburizing and holding time, shorten the production cycle and avoid the burning loss of alloy elements in molten iron. However, too long stirring time not only has a great impact on the service life of the furnace, but also increases the carbon loss in molten iron after the carburizer dissolves. Therefore, suitable iron stirring time should be guaranteed to completely dissolve the carburizing agent.
5. the influence of chemical composition of iron liquid on the absorbance of carburant
When the initial carbon content in molten iron is high, the absorption rate of carburizer is slow, the absorption amount is small, the burning loss is relatively large, and the absorption rate of carburizer is low under a certain dissolution limit. When the initial carbon content of molten iron is low, the opposite is true. In addition, silicon and sulfur in molten iron hinder the absorption of carbon and reduce the absorption rate of carburant, while manganese contributes to the absorption of carbon and increases the absorption rate of carburant. As far as the extent of impact is concerned, silicon is the largest, followed by manganese, and carbon and sulfur are less affected. Therefore, the actual production process should increase manganese first, then increase carbon and then increase silicon.