(1) Used as a deoxidizer and a gold alloy in the steelmaking industry. In order to obtain chemical composition of qualified steel and to ensure the quality of steel, in the final stage of steelmaking must be deoxidized, silicon and oxygen between the chemical affinity is large, so Calcium Silicon Alloy is a strong steel oxide for precipitation and diffusion deoxidation. In the steel to add a certain number of silicon, can significantly improve the strength of steel, hardness and flexibility, and thus in the smelting structural steel (silicon 0.40-1.75%), tool steel (containing SiO.30-1.8%), spring steel Containing SiO00-2-8%) and silicon steel for transformers (2.81-4.8% silicon), Calcium Silicon Alloy is also used as a gold alloy.
In addition, in the steel industry, the use of Calcium Silicon Alloy powder burning at high temperatures can release a lot of heat this feature, often used as a steel ingot heating agent to improve the quality and recovery of ingots.
(2) Used as inoculants and nodulizers in the cast iron industry. Cast iron is an important metal material in the modern industry, it is cheaper than steel, easy to melt smelting, with excellent casting performance and much better than the steel engage in seismic capacity, especially ductile iron, its mechanical properties to reach or close to the steel Mechanical behavior. The addition of a certain amount of Calcium Silicon Alloy in the cast iron can prevent the formation of carbides in the iron and promote the precipitation and spheroidization of the graphite. Thus, in the production of ductile iron, Calcium Silicon Alloy is an important inoculant (to help the precipitation of graphite) and spheroidization Agent.
(3) iron as a reducing agent. Not only the chemical affinity between silicon and oxygen is very large, and the silicon content of high silicon Calcium Silicon Alloy is very low. Therefore, high-silicon Calcium Silicon Alloy (or siliceous alloy) is ferroalloy industry in the production of low-carbon ferroalloy is more commonly used as a reducing agent.
(4) use in other respects. Milled or atomized treated Calcium Silicon Alloy powder can be used as a suspension phase in the beneficiation industry. In the electrode manufacturing industry can be used as electrode coating. High silicon Calcium Silicon Alloy in the chemical industry can be used to manufacture silicone and other products.
In these applications, the steelmaking industry, the foundry industry and the ferroalloy industry are the largest users of Calcium Silicon Alloy. They consume about 90% more Calcium Silicon Alloy. Among the various grades of Calcium Silicon Alloy, the most widely used is 75% Calcium Silicon Alloy. In the steel industry, each production of 1t steel consumption of about 3-5kg75% Calcium Silicon Alloy.
Calcium Silicon Alloy welding methods are many, various methods have their different applications. In addition to the traditional welding, resistance welding, gas welding methods, some other welding methods (such as plasma arc welding, electron beam welding, vacuum diffusion welding, etc.) can also be easily welded together aluminum.
Calcium Silicon Alloy commonly used welding method of the characteristics and scope of application in Table 1. Should be based on aluminum and Calcium Silicon Alloy grades, weldment thickness, product structure and the requirements of welding and other options.
Calcium in the Calcium Silicon Alloy in the solid solubility is very low, with aluminum to form CaAl4 compounds, calcium is Calcium Silicon Alloy superplastic elements, about 5% calcium and 5% manganese Calcium Silicon Alloy with superplasticity. Calcium and silicon form CaSi, insoluble in aluminum, due to reduced the amount of silicon solid solution, can slightly improve the conductivity of industrial pure aluminum. Calcium can improve the cutting performance of Calcium Silicon Alloy. CaSi2 can not strengthen the Calcium Silicon Alloy heat treatment. Trace calcium is good for removing hydrogen from aluminum.