Continuous casting system and process producing large-specification elliptical billets

Abstract

The invention relates to a continuous casting system producing large-specification elliptical billets. The continuous casting system comprises a tundish, a crystallizer, an aftercooling area and a straightening mechanism, a continuous temperature measuring device matched with an inductive heating device is arranged in the tundish, an electromagnetic stirring device stirring molten steel is arranged in the crystallizer, the aftercooling area comprises an arc-shaped guide section and atomizing water nozzles arranged on two sides of the arc-shaped guide section, the straightening mechanism comprises a plurality of straighteners capable of continuously straightening the elliptical billets, and the straighteners are distributed along the progressing direction of the elliptical billets on a declining curve, and a cutting machine, a burial pit and a shot blasting machine are sequentially arranged at the tail end of the straighteners. The invention further provides a continuous casting process on the basis of the continuous casting system. The continuous casting process has the advantages of short procedures and low cost, the elliptical billets have excellent surface quality, macro quality of the cross section reaches the primary standard of the country, and yield of the elliptical billets is up to 96% which is at least 10% higher than a die casting process.

Description

technical field [0001] The invention relates to a continuous casting system and a continuous casting process for producing elliptical blanks, in particular to a continuous casting system for producing extra-large-sized ultra-high alloy elliptical blanks and a continuous casting process based on the continuous casting system. Background technique [0002] The current world economic situation is complex and changeable, and the iron and steel industry is facing the dual pressure of high raw material costs and overcapacity, and is gradually entering the era of meager profits. Improving product quality and establishing a brand image are conducive to improving the market competitiveness of enterprises. For the manufacture of thick plates, continuous casting elliptical billets are used instead of slabs for rolling thick plates. By increasing the rolling compression ratio, the interior of thick plates can be improved. quality. The oversized elliptical billet is used as a special-sh...

AI Technical Summary

Problems solved by technology

However, the fly in the ointment is that this system is only suitable for manufacturing billets with a diameter of 388-450mm, and its performance cannot be guaranteed for elliptical billets with larger diameters.

[0004] In addition, the existing round billet continuous casting system still has the following main problems in the process of producing round billets: In the step of heating molten steel by the tundish, due to the lack of effective control means, the minimum superheat of molten steel can only be stably controlled at 20~ 30°C, but can not achieve low superheat pouring

In addition, when the existing continuous casting system produces large-sized round billets of φ600mm, the problem of crusting and solidification of molten steel on the surface of the crystallizer will appear to varying degrees during pouring, which brings many difficulties to normal pouring, especially in the production of larger billets. When the specification is elliptical, the crusting and solidification of molten steel on the surface of the crystallizer may lead to the paralysis of the entire production line

In addition, since the soft reduction technology for elliptical billets has not yet been developed, the large shrinkage produced by extra-large elliptical billets during pouring and solidification will not be able to make up for it, which will inevitably cause serious segregation and porosity in the center of the billet, which also limits the use of Important reasons for the existing round billet continuous casting system to produce larger diameter round billets

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