Vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase vanadium content

The invention relates to a vanadium oxide core-spun yarn for smelting vanadium microalloyed steel to increase the vanadium content, belongs to high-strength low-alloy steel, and particularly relates to a vanadium-content-increasing additive for external vanadium microalloyed steel refining. The vanadium oxide core-spun yarn comprises a yarn core and an outer cover, wherein the outer cover is tightly clad on the yarn core. The vanadium oxide core-spun yarn is characterized in that the yarn core is formed by fully mixing 60-75% of powdered vanadium oxide V2O5, 39-24% of a powdered reducing agent (aluminum powder), and the balance being impuritiesby weight percentage; the outer cover is a low-carbon steel strip, and the thickness is 0.32-0.45mm; the core-spun yarn is circular strip-shaped, and the diameter is phi 9-13mm; the weight ratio of the yarn core and the outer cover per meter is 1.16-1.22. The vanadium oxide core-spun yarn is prepared according to the steps of powder preparation, drying, batching, powder