Abstract: Theoretical foundation of improving cleanness of steel and modifying inclusions by calcium treatment process were summarized, combined with the physical properties of calcium, evolution of calcium treating method in steel was reviewed, the advantage of wire-feeding process alone with the optimization routine of calcium cored-wire structure and core powder compositionwas emphasically analyzed ,and optimization of wire feeding process was summarized, the problems unsolved in calcium treatment together with the research fields to stabilize calcium yield and realize accurate calcium addition was put forward.

Key words: calcium treatment, wire-feeding process, cored wire, accurate calcium addition