Control of Surface Longitudinal Cracks During the Steel Continuous Casting

The surface longitudinal cracksSurface longitudinal cracks have been one of the most serious defectsDefects in the cast products. In this study, the surface longitudinal cracksSurface longitudinal cracks are mainly attributed to poor lubrication for mold fluxMold flux by crackCrack, heat transferHeat transfer of mold, and properties of mold fluxMold flux analysis. Comparing with the primary mold fluxMold flux (PMF), the properties of optimized mold fluxMold flux (PMF) had some changes: (1) the melting temperatureTemperature of the optimized mold fluxMold flux was decreased from 1174 to 1142 °C; (2) the wetting angle was increased from 38.64° to 49.96°, which decreased the interfacial wettabilityWettability; (3) the viscosity (1300 °C) was decreased from 0.684 to 0.398 Pa s, which had a better lubrication effect; (4) the proportion of crystalline layer increased from 62.87 to 70.99%, which increased the crystallization rate; (5) the response temperatureTemperature decreased from 389 to 356 °C, which resulted in better heat control. The optimized mold fluxMold flux (OMF) and primary mold fluxMold flux (PMF) were used to simulate continuous castingContinuous casting processProcess, the optimized mold fluxMold flux shows excellent performance for the quality of the shellShell.