The internal flow, free surface shape, and level fluctuation of liquid metal exposed to linear electromagnetic stirring were measured and analyzed against the background of an actual metallurgical equipment with linear electromagnetic stirring system. The desulphurization process, with or without imposition of linear electromagnetic stirring, was also studied experimentally. The changes in sulfur content of hot metal with respect to time were obtained, and the volumetric mass transfer coefficients corresponding to different stirring currents were determined. The results showed that linear electromagnetic stirring can effectively promote internal flow, effectively increase the level fluctuation, and significantly improve the kinetic condition of liquid metal. The internal flow and level fluctuation of liquid metal increase in line with the increase in electromagnetic stirring intensity. The desulphurization experiments show that linear electromagnetic stirring can significantly promote the desulphurization process of hot metal, and that the technology has wide application potential in promoting various slag metal reactions.

Effect of Linear Electromagnetic Stirring on Behavior of Liquid Metal and Rate of Slag-Metal Interfacial Reactions

L stainless steel is widely used for fashion jewelry, but it can carry a large number of bacteria and bring the risk of infection since the steel has no antimicrobial performance. In this paper, the effects of Ce on the antibacterial property, corrosion resistance and processability of 316L were studied by microscopic observation, thin- film adhering quantitative bacteriostasis, and electrochemical and mechanical tests. The results show that a trace of Ce can distribute uniformly in the matrix of 316L and slightly improve its corrosion resistance in artificial sweat. With an increase in Ce content, the Ce is prone to form clustering, which degrades the corrosion resistance and the processability. The Ce-containing 316L exhibits Hormesis effect against S. aureus. A small Ce addition stimulates the growth of S. aureus. As the Ce content increases, the modified 316L exhibits an improved antibacterial efficacy. The more Ce is added, the better antibacterial capability is achieved. Overall, if the 316L is modified with Ce alone, it is difficult to obtain the optimal combination of corrosion resistance, antibacterial performance and processability. In spite of that, 0.15 wt.%-0.20 wt.% Ce around is inferred to be the best trade-off.

Study of Ce-modified antibacterial 316L stainless steel

Static and fatigue properties of 80 mm-thick Q460GJC butt weld joint

Based on 10Cr17 stainless steel containing 0~0.1% Ce,the content of carbon,chromium and cerium of Ce-containing stainless steel were tested by means of chemical analysis.The antibacterial property and the anti-corrosion property of stainless steel against ATCC8099 were investigated using foil method.The results showed that Ce-contained steel has excellent antibacterial properties without heat treatment compared with that of Cu-contained stainless steel,and the addition of Ce makes it easier for the stainless steel to be passivated.

Study on antibacterial properties of cerium-contained 10Cr17 stainless steel

Electromagnetic stirring in ladle furnace(LF-EMS) is an important stirring means of ladle furnace refining processThe magnetic field and flow field of a 90 t LF-EMS in a specific steel-makinfg plant are studied by numerical simulation in this paperIt is found that the melt flow turns to be a large and single loop in ladle furnace under the action of the electromagnetic stirringThe distribution of velocity and turbulent kinetic energy in ladle furnace is homogeneous

Numerical simulation of magnetic field and flow field in electromagnetic stirring in ladle furnace

The 60 mm thick heavy plate of 16MnR was welded by using straight polarity direct current automatic submerged-arc welding method with suitable welding parameters(electric current is 450 A;welding speed is 140 mm/min)The microstructures of the welded joint were observed and analyzed,and the surface microhardness of the welded joint was measuredThe results showed that good appearance and uniform structure were obtained at the welded joint region,and the maximum micro-hardness was found in the welded heat affected zone;the minimum micro-hardness was on the parent materialThe quality of the welded joint could meet the requirements in use

Zhao Li-ping

Papers

Study on antibacterial properties of cerium-contained 10Cr17 stainless steel

Numerical simulation of magnetic field and flow field in electromagnetic stirring in ladle furnace

Microstructures and properties of welded joint of the extra-thick plate of 16MnR steel