Ruhrstahl Heraeus 공정에서 아르곤 유량 및 진공 시간이 다른 TMCP강의 개재물 분포 및 기계적 특성

Abstract

In this study, TMCP steel was continuously cast (CC) by varying the argon gas flow rate and vacuum time in the Ruhrstahl Heraeus (RH) refining process. Using the RH and the CC specimens, the distribution of the inclusions and the mechanical properties were evaluated. In the RH and the CC specimens, a lot of oxides and Al-O type inclusions were observed. The average Vickers hardness of the RH and the CC specimens did not show a constant, but showed dispersion in a certain range. In the shape and scale parameters of Vickers hardness of the RH and CC specimens, the CC specimen with an argon gas flow rate of 160Nm3 and a vacuum time of 12 minutes was the best. Mechanical properties (tensile strength, yield strength and elongation) were consistent with the Weibull probability distribution analysis results. The impact resistance was the best for CC specimens with an argon flow rate of 140 Nm3 and a vacuum time of 12 minutes. Although the inclusions and mechanical properties of the RH and CC specimens were evaluated according to the argon gas flow rate and vacuum time, these values were no significant difference.