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

A corner crack and micro-alloying technology, applied in the field of continuous casting, to achieve the effects of increasing metal yield, preventing overcooling, and improving mechanical properties

Active Publication Date: 2019-02-26
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

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Experimental program
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Effect test

Embodiment 1

[0042]When heating the low-carbon steel slab containing Nb=0.005%, N=0.0031% and microalloyed, the precipitation temperature of NbN can be calculated according to the solubility product of NbN nitride in steel at 910°C. Before straightening, a large amount of NbN is precipitated on the austenite grain boundary to increase the crack sensitivity of the slab to prevent corner cracks, and finally adjust the power of the induction heating coil to 60kW to ensure that the temperature of the corner can be raised to 950 before straightening °C is enough. Since NbN is relatively sensitive to cracks, in order to achieve a good heating effect at the deeper corners of the slab, the frequency of the power supply is adjusted to a relatively low frequency mode of 5000 Hz.

Embodiment 2

[0044] When heating the micro-alloyed low-carbon steel slab containing V=0.01%, N=0.0035%, the precipitation temperature of VN can be calculated at 772°C according to the solubility product of VN nitrides in steel, because the precipitation temperature of VN Relatively low, the power of the induction heating coil is finally adjusted to 30kW to ensure that the temperature at the corner can be raised to 800°C before straightening. Since VN is less sensitive to cracks than NbN, it can be used at relatively low power 15000Hz high frequency heating mode.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/12
CPCB22D11/1213
Inventor 李德军于赋志方恩俊许孟春刘清海金百刚张宁梅雪辉罗建华
Owner ANGANG STEEL CO LTD
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