A device and method for reducing cracks at the corners of microalloyed slabs

Abstract

The invention relates to a device and a method for reducing angle cracks of a microalloyed plate blank. The device comprises a heating coil for energy conversion, and wiring columns; the heating coil is connected with a power supply through the wiring columns, is connected with an electrifying part, and is an L-shaped structure; two edges of the L-shaped structure are respectively an edge A and an edge B; the edge A and the edge B are both back-to-font structures; the heating coil is electrified to generate induction magnetic fields on the edge A and the edge B; the generated magnetic fields form induction currents in plate blank corner angles corresponding to the edge A and the edge B; the two wiring columns are both semi-cylindrical structures; and a mica piece for preventing short circuit is arranged between the two wiring columns. The device has the following advantages: the angle parts of a cast blank are inductively heated to increase the angle temperatures of the cast blank, so that the angles of the cast blank can be above a temperature upper limit of a low-temperature brittle area before straightening to prevent precipitation of various carbon nitride compounds at the angles of the cast blank, and the plasticity of the angles of the cast blank is improved to effectively prevent cracks generated at the angles of the cast blank in the straightening process.

Description

technical field [0001] The invention belongs to the technical field of continuous casting, and in particular relates to a device and a method for reducing cracks at the corners of microalloyed slabs. Background technique [0002] Cai Kaike found in the research on various defects of continuous casting slabs that cracks in slabs accounted for more than 50% of all kinds of defects. Common surface defects of slabs include corner transverse cracks, edge longitudinal cracks, transverse cracks, center longitudinal cracks, star cracks, deep vibration marks, pores, etc. Most of the slab surface defects have been effectively resolved through the adjustment of mold slag, the vibration mode, shape, cooling parameters of the mold, the optimization of the secondary cooling, and the control of the liquid level of the mold, but the transverse cracks at the corners have not been effectively resolved. In the production of micro-alloy steel, this kind of corner transverse crack defect has th...

AI Technical Summary

Problems solved by technology

[0014] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a device and method for reducing cracks at the corners of micro-alloyed slabs. The internal temperature is too low to keep it away from the low-temperature brittle zone, so that the occurrence of transverse crack defects at the corners can be reduced or eliminated during the slab stretching and straightening process, so as to reduce the processing of corner cleaning and stripping at the off-line of the slab and improve the metal yield of the slab. Yield and increase the heat delivery of the slab and the continuity of the process

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