The double-layer solid cored pure calcium wire is formed by wrapping the calcium wire with the inner steel strip and biting the outer steel strip. The steel strip is thickened to make the calcium wire inserted deeper into the liquid steel.

①The metal shell of ordinary cored wire is easy to bend during adding; The double-layer solid cored calcium wire has good flexibility, tight bite, small resistance when passing through the wire feeder, stable feeding speed and accurate feeding quantity.

② The double-layer solid cored pure calcium wire can go deep into the bottom of liquid steel for complete reaction, adjust the composition of liquid steel and improve the cleanliness of liquid steel, so as to achieve the refining effect.