Abstract:Oxygen content of gear steel was decreased and the cleanliness improved by optimizing and controlling EAF smelting, refining and continuous casting process, and adopting a series of technical measures with increasing hot metal charging rate, pre-deoxidation and protection casting and so on in Special Steel Plant of Laiwu Iron & Steel Co.Ltd. The results showed that the oxygen content of 20CrMnTiH and its affiliated steel grade was decreased from 25ppm to 20ppm after optimization, and the lowest was 13ppm.