As the electromagnetic stirring (M-EMS) to produce liquid core within the mold rotation, improve heat transfer rate inside the crystal, but also have some other beneficial effects.
(1) liquid-core sports uniform temperature of the liquid steel, reducing the temperature gradient, and helping to eliminate overheating and improve the uniformity of solidification solidified shell;
(2) near the solid-liquid interface movement, so that a large number of unstable solidification front dendrite crystals were transferred into liquid steel in part by remolding, part of the formation of equated growth of the core so that the slab of the equated zone to expand and improve center segregation and center porosity;
(3) The electromagnetic force can be enhanced mold the up stream will flow into the upper high-temperature steel, so that the meniscus of the initial solidification shell shortened, so that shallow oscillation marks; up stream causing the mold of "hot top" conditions, but also help protect the residue melting and lubrication, to prevent surface cracks;
(4) Mixing can keep the slag in the surface area and clean up large inclusions, into the slag, thereby to obtain a clean surface.
Magnetic stirrer in the current low frequency magnetic field penetration depth, light penetration depth at higher frequencies, the mixing intensity increases as the coil current is increased. Only in the low superheat pouring, mixing only with good results, or equated zone within the slab is difficult to expand the center to improve the poor segregation.



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