Calcium, derived from calcium-silicon flux-cored wires, is a widely used powder material for cores. Although it is a strong deoxidizer, it has a relatively low specific gravity and a relatively low melting point, and it is prone to bubble formation at high temperatures. Therefore, if only calcium metal is used as the flux-cored layer of the flux-cored wire, the flux-cored wire will start to burn, as soon as it is fed into the refining furnace, it will start to burn. If the flux-cored wire does not fall below the middle of the molten steel, the desired cleaning effect cannot be achieved.
Even if measures such as the use of high-temperature resistant sheath material and the rapid introduction of the wire are used, it is not possible to completely prevent it from burning. At the same time, the combustion of the powder layer of the core under such operating conditions will not achieve the desired cleaning effect, and will also lead to the waste of a more expensive calcium resource.