In order to improve the various properties of aluminium, various alloying elements need to be added to make alloys of different grades. At present, China basically uses alloys or pure metals to join. Some aluminium processing plants have used aluminium alloy additives instead of master alloys. It can be seen from the effect that aluminium alloy additives not only have all the advantages of master alloys, but also overcome some of the disadvantages of master alloys. Therefore, aluminium alloy additives are becoming more and more widely used.
Aluminum and aluminium alloy additives are far superior to master alloys due to their good adding mechanism, convenient use method, stable element yield and economical production methods.
To avoid excessively high smelting temperature, resulting in a reduction in the life of the smelting furnace; increase the burning loss of aluminum and alloy elements, and reduce the smelting productivity, and worsen working conditions.
What is more serious is that the composition of the master alloy is not uniform, which brings a series of difficulties to the control of the alloy element content in the future. For most civilian aluminum alloys, it is an ideal material to replace master alloys.
Aluminium and aluminium alloy additives can be added directly to the melting furnace or the holding furnace, but they must be added before refining. In order to achieve the desired absorption rate of alloying elements, other matching conditions are required. The specific description is as follows: Due to the pure metal addition mechanism, the absorption rate of alloying elements always increases with the increase of temperature.
Field experience has proved that aluminum and aluminium alloy additives are more sensitive to temperature, especially manganese additives. The temperature of the molten aluminum should be controlled at 740±10℃ and the additives should be added, otherwise the metal absorption time will be prolonged.