Silicon iron calcium alloy in Calcium Cored Wire can work as deoxidant and desulfurizer, change the form of inclusions, and improve steel quality. It also works as temperature-gaining agent in the converter steel making workshop and as inoculant for nodular cast iron.
It feeds calcium into the molten steel deeper and stays longer than the conventional powder, enabling higher calcium recovery. It also reduces caster nozzle clogging caused by alumina (Al2O3) inclusions.
Calcium silicon alloy is an effective deoxidizer and desulfurizer for high-quality steel, low-carbon steel, and stainless steel. It can also help control the shape, size and distribution of oxide and sulfide inclusions, improving the fluidity, processability, ductility, and impact properties of steel products.
It is used as inoculant for cast iron industry, can form fine or spherical graphite in grey cast iron and make it distribute evenly. It can also increase the silicon content and desulfurization of cast iron. It can be used as warming agent in converter steel workshop.
Compared with other methods, this method adopts plasma inductance to couple into mensuration of row impurity element, without involving separation, precipitating, filtration and washing. It can be widely applied and save cost of labor and energy. The analytical procedure is simple and convenient, and it can avoid interference element, improve analysis accuracy. The equipment is small, easy to operate, and stable. The operating time is short, and the results are precise.
This core wire can be more conveniently put metallurgical materials into the molten steel by using special equipment. It helps the steel manufacturer to fully melt and chemically reacted metallurgical additives and can avoid the reaction with air and slag, and improve the absorption rate of metallurgy additives.
It is a powerful compound deoxidizer and desulfurizer to control the size, shape and distribution of oxide and sulphide inclusion in high-quality steel. It can also change the form of non-metallic inclusions and increase fluidity, processability and ductility of steel products.
Compared to the calcium-silicon powder, this type of core wire has the advantage of a lower feeding quantity and cost. In addition, it has a high degree of arsenic removal efficiency. This is because the melted alloy has less oxygen than pure calcium. Consequently, it is easier to remove sulfide and arsenic from the molten iron. However, its content of calcium should be controlled within a certain range, because it is more likely to react with oxygen than sulfur and sulfide.
Currently, the most widely used method for integrated steel applications of metal calcium is cored wire. Cored wire is made of metal calcium powder stuffed in a cold rolled low carbon strip and then welded together by a professional cored wire machine. The cored wire is then inserted smoothly into the molten iron or molten steel through a wire feeder. It melts at an ideal depth in the molten metal and performs a physicochemical reaction, thereby increasing the yield of the added element.
The earliest methods of introducing the calcium alloy directly into the ladle or spraying it into the molten steel have become uneconomical because of their unstable treatment effect and high cost. The cored wire is a promising alternative.
Compared to the conventional calcium treated by spraying into the molten steel, the cored wire increases the reaction depth of the injected metal, reduces the splashing phenomenon, and improves the efficiency and use safety simultaneously.
Silicon iron calcium alloy is mainly used as deoxidizers and desulfurizers in steel making. It is particularly suitable as a final deoxidizer for high quality and high strength steels, which cannot tolerate the level of inclusions that remain after standard deoxidization with ferrosilicon or silico manganese. It can also be used as a temperature-gaining agent in converter steel workshops and as an inoculant or denaturant for cast iron production. It can reduce the size of sulphide inclusions and promote their random distribution, thus minimizing chain-type inclusions.
Cored wire can be inserted smoothly into molten iron or molten steel, so that it can melt at an ideal depth and initiate a physicochemical reaction with the elements being added to molten metal. The result is a more effective method of adding element to molten metal, which reduces the loss and consumption of raw materials and increases the yield. The operation process is simple, and the analysis is fast, accurate, and stable.
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