Electromagnetic brake (EMBr) affects the flow field in mold during the slab continuous casting process. Flow control mold II (FC Mold II) has been developed to resolve the defects of the third generation (flow control mold) of EMBr which the braking effect on meniscus is too strong to make the surface flow excessively stabilize and it would be prone to freezing and related defects. To gain a fundamental understanding of FC Mold II, a mercury physical model was developed to investigate the influence of the magnetic field intensity match on metal flow in FC Mold II based on the 1350 mm×230 mm slab continuous casting process in a factory. The flow regime and velocity distribution in mold were measured by ultrasound Doppler velocimeter (UDV) with the maximum magnetic field intensity of the upper pair of magnetic poles B 1 =0.18, 0.36 and 0.50 T respectively and the maximum magnetic field intensity of the down pair of magnetic poles B 2 =0.50 T, while the mold casting speed is 0.41, 0.52 and 0.82 m/min respectively corresponding to the practical casting speed 1.00, 1.30 and 2.00 m/min respectively. The influences of the magnetic field intensity match on the flow discharged from the nozzle, the flow near the meniscus and the washing intensity to the mold narrow wall were analyzed and studied. The results showed that, when the magnetic field intensity match of the upper and the lower pair of magnetic poles B 1 /B 2 ≤ 1, with the continuous casting speed increasing, the value of B 1 /B 2 should increase in order to get an ideal braking effect. The value of B 1 /B 2 should be 0.36, 0.72 and 1.00 respectively when the model casting speed is 0.41, 0.52 and 0.82 m/min respectively. The increasing of the intensity of the magnetic field reduces the £flow passage¥effect caused by EMBr, and is conducive to the formation of the plug flow under the electromagnetic braking region.
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