Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device

Abstract

The invention discloses a low-energy-consumption electromagnetic stirring method for continuous casting. The hot top composite novel low-energy-consumption electromagnetic stirring technique is used. A hot top is arranged in a crystallizer, a steady magnetic field with no energy consumption and low energy consumption is exerted on the periphery simultaneously, an electrode bar is inserted in a tundish, a roller electrode is arranged at the solidifying tail end of a continuous casting billet, and therefore alternating current can be exerted on all non-solidification metal melts between the crystallizer and the solidifying tail end. The alternating current and an additional steady magnetic field are acted with each other so as to enable all the non-solidification metal melts in the whole continuous casting billet in a continuous casting process to generate electromagnetic stirring force for driving the continuous casting melts to rotate clockwise and counterclockwise, thereby stirring non-solidification structures, smashing dendrites of solidification front edges of the melts, refining the solidification structures, reducing segregation and cracks. The invention further provides a metal continuous casting device which can be applied to a continuous casting process of various molten metals prone in segregation and draw an alloy continuous casting billet with refined solidification structure, small segregation and no crack.

Description

technical field [0001] The present invention relates to a continuous casting process and device, in particular to a device for refining the solidification structure of continuous casting slabs, reducing or inhibiting component segregation, preventing continuous casting slab thermal cracking, preparing high-performance continuous casting slabs and reducing energy consumption Continuous casting process and equipment under the action of external field. Background technique [0002] In the continuous casting process of metals and alloys, especially in the continuous casting process of large-size alloy billets, due to the limitation of the heat transfer process of continuous casting, the billets often form thick columnar crystals or dendrites, which segregate low-melting point alloy elements Between the dendrites, due to solidification and shrinkage, severe positive or negative segregation is formed, which may lead to hot cracking of the continuous casting slab and scrap it, and ...

AI Technical Summary

Problems solved by technology

The biggest problem with these methods is that the alternating magnetic field must pass through mold materials with good thermal and electrical conductivity, such as copper, stainless steel, graphite, aluminum and their alloys, which will consume a lot of electric energy, even for the second Cold electromagnetic stirring and terminal electromagnetic stirring, although the alternating magnetic field does not need to penetrate the mold material, but it also needs to consume a lot of electric energy to penetrate into the molten steel area inside the solidified billet, currently used for continuous casting electromagnetic stirring The power supply ranges from tens of kilowatts to hundreds of kilowatts, and the electromagnetic stirring power actually used in metal and alloy liquids is less than 20% or even lower of the total power consumption, which not only increases production costs, but also The efficiency of electromagnetic stirring is greatly reduced. Therefore, it is urgent to develop new electromagnetic stirring methods and devices with higher efficiency and lower energy consumption.

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