Metal-cored wires offer higher travel speeds and deposition rates than solid wire. They are well suited for applications that require a high amount of out-of-position welding and for jobs prone to burn-through.
Alloy cored wire is used for the purification of liquid steel in primary and secondary metallurgy. It helps reduce the quantity of precious elements added and saves costs of refining.
Unlike calcium iron wire and calcium silicon wire which use powder as core material, this new production method uses a cold rolling low-carbon steel strip to wrap pure solid calcium metal granules to form a high density, solid core. This eliminates the problems of unevenness and hollowness of the core, resulting in a stable operation during the wire feeding process.
The high purity of the calcium cored wire ensures that no oxygen or sulphur is introduced into the molten steel during the casting process, and the inclusion morphology of the liquid steel can be controlled as well. This greatly improves the aluminum killed molten steel continuous casting process, and reduces the risk of nozzle blockage. The high purity also reduces the cost of reducing agents used in the process.
Ca has low density, melting and boiling points. Consequently, the solubility of Ca in steel is very low. Hence, the addition of metal calcium through cored wire is an effective way to add it to the molten steel. During this process the contact between Ca and the liquid steel is intimate allowing efficient removal of O, S from the melt.
In the case of Al killed molten steel, calcium treatment reduces the volume fraction of oxide and sulphide inclusions through deoxidation and desulphurization and gives composition control (Fig. 3.1). Furthermore, it also modifies the shape of sulphide stringers into globular form, which eliminates directional anisotropy and improves the fatigue resistance in the final product. It further helps to prevent nozzle clogging in the continuous casting of liquid steel.
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Incorporating calcium metal into molten steel improves the quality of finished product by deoxidizing and desulfurizing, and giving shape control to nonmetallic inclusions in the steel. In the aluminum killed-steel continuous casting process, it also reduces the tendency for clogging of nozzles. This new production method is more environmentally friendly than conventional calcium treatment.
The use of pure calcium cored wire allows the efficient introduction of calcium into molten steel. It reduces caster nozzle clogging by modifying inclusions and improves deoxidation and desulfurization efficiency. It also increases the amount of sulfides (CaSi2) formed, which helps eliminate toxic gases and reduces refractory damage.
The inner sheath is made of pure calcium metal, and the outer layer is a cold rolled low carbon steel strip. This combination ensures that the purity of the core is maintained and the alloy composition can be precisely controlled.
The resulting electrode has excellent all-position welding process performance, beautiful bead formation, and stable arc. It is especially useful for welding high strength, toughness, and crack resistance steels. In addition, the pure calcium core reduces the consumption of expensive and energy-consuming refractory materials.
A calcium metal core wire is a special kind of alloy wire. It is coated with steel strip on the surface and filled with pure calcium or calcium iron granules inside. It is used to treat molten steel during tapping, EAF and BOF melting process, as well as desoxidizing, desulphurising and alloying agent. It also solves the problem of nozzle blockage in continuous casting process.
It reduces the oxidation burning loss rate and improves the absorption efficiency of calcium metal in the molten steel, thus saving energy. It can effectively reduce the consumption of solid calcium pure wire and save cost. It is also a good choice for metallurgical companies with low aluminum content, oxygen content and inclusions. It can effectively increase the production yield and quality of the steel product.
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