Before the 1950s, in the cast iron industry, the traditional cold wind cupola has always had an absolute advantage. Since the 1960s, the number of factories using induction furnaces in the cast iron industry has increased. In particular, there have been major improvements in the power supply of induction furnaces since the 1990s. The number of electric furnaces used in cast iron plants has increased rapidly. Because the working environment is better when the electric furnace is used, the composition of the iron liquid is easier to control accurately, and the electric furnace equipment and the used refractory materials are improved. In the developed countries, the use of the electric furnace as the smelting equipment is quite common, and it was once thought that the cupola was a cupola. Will gradually be eliminated and replaced by electric furnace. At the same time, the cupola has also undergone many major improvements and developments. Since the 1990s, the environmental protection regulations of various industrial countries have strict requirements on the emission of exhaust gas residues. Many people in the foundry industry believe that this will give electric furnaces a greater advantage over cupola furnaces because the melting of electric furnaces is cleaner. However, the actual situation is not necessarily the case.
In recent years, the cupola from the cupola has been used to blow dust from the cupola dust and even powdery garbage. In addition to cupolas and electric furnaces, there are also other melting equipments for the production of cast irons. The uniform distribution of carbides in the matrix is ​​an important factor in controlling the wear rate. If the toughness of the matrix is ​​poor, the carbides will lose their support and cause a fracture under the action of the shear stress. At the same time, the wear of the high-chromium cast iron will also occur. main reason. Therefore, it is required that the high-chromium cast iron must be further heat treated so that the amount of retained austenite in the as-cast microstructure can be further reduced, so that the matrix structure has both high hardness and certain toughness. High-chromium iron castings should be adjusted according to the carbon and chromium content in the control of carbon and chromium content. This is a prerequisite for ensuring the improvement of impact wear resistance of high-chromium cast iron. For castings with high requirements for impact toughness, the lower limit controls the carbon content, and for high wear resistance, the upper limit controls the carbon content.
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