A Ferro Calcium Cored Wire is composed of three concentric cylinder layers - calcium, steel, and paper. The steel is then coated with paper. The surface temperature of the cored wire increases from 50deg C to over 1400deg C within 0.15 seconds, as shown in FIG. 8. The graph shows the temperature increase during free travel. During this time, the wire is melting due to the high exchange coefficient, which is greater than 1.3.
This wire can be used for secondary treatment of steel, including powder injection, CAS, ladle arc furnace, and vacuum processes. The primary applications of a cored wire are in the desulfurization, production of GS cast iron, and inoculation of molding cast iron. Its high melting point is one of its benefits. Its high melting point and even temperature stability make it suitable for a wide range of metal alloys, including stainless steel.
The oxidation and incorporation of calcium in steel determine the amount of calcium recovered from a cored wire. In most cases, the majority of calcium added by a cored wire is lost by oxidation and evaporation in the steel, slag, and refractories. The proper purging of oxidation inclusions can improve the amount of calcium recovered. It can also be adjusted to achieve the desired transformation rate.
While it is difficult to determine the exact percentage of calcium, it has been demonstrated that when a wire with a calcium core is immersed in a gray cast iron, it will melt at around 1200deg C. However, a cored wire with a 75% ferrosilicon content is immersed in 1400deg C. The reduction of temperature reduces the risk of the wire flexion during the bath.
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