Silicon iron calcium aluminum alloy in Calcium Cored Wire is suitable for the deoxidation, desulfurization and alloy fine-tuning of molten steel in extra-furnace refining. It is easy to use, economical, small in size and safe in operation.
It has the following advantages: 1. It reduces the oxygen content of molten steel and improves machinability, ductility and strength.
The most efficient way to introduce Calcium Silicon into the steel melt is by cored wire. It is convenient, safe, inexpensive and easy to use, especially for small casters. It does not cause turbulence, splashing or loss of liquid steel, which is often the case with conventional calcium powder.
Due to its low density and reactivity, pure calcium has difficulty dissolving in molten steel. It reacts rapidly with oxygen, sulfur and arsenic to form composite inclusions such as CaO, oxysulfides and CaS. These reactions increase the reactivity of the slag, causing it to clog caster nozzles and decrease slag discharge capacity.
Cored wire solves this problem by blowing calcium into the melt at high velocity. It does not require expensive refractory materials, does not pollute the environment and requires minimal auxiliary equipment. It also allows for precise control of the alloy composition. It is available in a wide range of ratios of Silicon Iron and Calcium.
Silicon iron calcium aluminum alloy in Calcium Cored Wire can be used as deoxidizer, desulfurizer and to change the shape of inclusions in molten steel, improving fluidity, machinability, impact toughness and ductility. It is also used as warming agent in converter steel workshop, inoculant for cast iron and additive in the production of ductile iron.
This kind of refining addition can be fed into the molten steel by different wire feeding methods. When the alloy is fed into the ladle by this method, it is injected in the molten steel at a lower temperature than that of the steel melt and its reaction yield is higher than that with the powder.
Moreover, when the alloy is inserted into the molten steel, it can avoid reacting with air and slag, and increase the absorption of metallurgy additions. Therefore, it can achieve a higher reaction performance and save energy. It is suitable for both eutectic and hypoeutectic steels.
The production process of Silicon iron calcium aluminum alloy in Calcium Cored Wire is simple in structure, easy in operation and low in energy consumption. It has no smoke, no temperature drop and the molten steel feeding is done smoothly, it saves refractory materials and carrier gas. It also has a good effect on deoxidation, desulfurization and alloy fine-tuning of molten steel.
In order to obtain a better arsenic removal effect, the critical calcium content was determined. It was found that the optimal oxygen and sulfur concentration value in molten steel for arsenic removal is w[O]=0.0012% and w[S]=0.0054%, respectively.
When the critical calcium content is reached, the arsenic-containing inclusions in molten steel are transformed into composite inclusions, such as Ca3As2, which usually does not appear alone. These inclusions are able to combine with alumina, calcium oxide and other inclusions in molten steel, thereby making it easier for the floating removal of arsenic-containing inclusions. In addition, these inclusions can effectively reduce the number and change the shape of the arsenic-containing inclusions.
Silicon iron calcium aluminum alloy has strong deoxidation capacity, desulfurization ability and nonmetallic inclusions flotation ability. It is widely used in the steelmaking industry as a deoxidizer, desulfurizer and inoculant for cast iron. It is a good warming agent for converter steel refining workshops. It can also be used for calcium treatment of continuous casting steel.
Cored wire is an excellent equipment for the improvement of liquid steel quality, mainly because of its effective and stable stirring effect in the molten pool. Its use can significantly reduce the energy consumption of the melting process and improve the stability of liquid steel.
However, due to the difference in the specific gravity between iron powder and solid calcium powder, a mixing unevenness is often caused during feeding, which has a negative impact on the steel quality. Cored wire with a powder-filled core can avoid this problem, which makes it a high-quality product for reducing the steel production cost.
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