Core wire, also known as cored wire, is a linear material used in the field of metallurgical engineering for refining outside furnaces. It is composed of cold-rolled low-carbon steel strip wrapped with iron alloy powder core material, and has a circular or rectangular cross-section. By using the wire feeding method to feed refining agents and alloying agents into the deep part of the molten steel, deoxidation, desulfurization, degassing, and inclusion denaturation treatment can be achieved, which can solve the problem of blockage in the deoxidation steel mouth of continuous casting aluminum.

This technology began in the 1970s, with Hitachi Cable Company in Japan developing circular calcium silicate core wire in 1972, France developing rectangular core wire in the 1980s, and China achieving domestic production of core wire equipment from 1987 to 1989. The core wire adopts 0.2-0.6mm cold-rolled steel strip as the sheath material, and the core material covers more than 40 types of alloy powders such as calcium, magnesium, and aluminum. After pre deformation, locking, and rolling forming by the wire wrapping machine, it undergoes rust prevention treatment and sealed packaging [3-4] . The products include seamless metal calcium cored wire, solid metal calcium cored wire, and other types.