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Surface treatment method of continuous casting blank

A technology of surface treatment and continuous casting billet, applied in the field of surface treatment of continuous casting billet, can solve the problems of uneven cooling, uncontrollable cooling speed of billet surface, and billet bending, and achieve the effect of low energy consumption production

Inactive Publication Date: 2019-07-02
北京勤泽鸿翔冶金科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The online water cooling of continuous casting slabs plays a significant role in improving the surface quality of slabs, but there is an unavoidable problem when water is used as a cooling medium, that is, the boiling point of water is only 100°C. During the process of spraying and soaking, There will undoubtedly be a film boiling stage, resulting in uncontrollable cooling rate on the surface of the slab, and often uneven cooling, resulting in bending of the slab after on-line quenching of the continuous casting slab. For this reason, it is necessary to increase the pressure of water spray or strengthen the water tank In addition, the water-cooled quenching process is a process of chilling the surface of the slab, and its cooling intensity is often difficult to control. Many high-end automotive plates and cold heading steels have not been able to achieve hot delivery so far. The reason is that although AlN precipitation is controlled, quenching cracks are introduced

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Effect test

Embodiment 1

[0057] The method of the present invention is used in the production of high-end automotive panels in slab continuous casting workshops, including a cooling process with the following steps:

[0058] (1) After flame cutting and cut-to-length cutting of the continuous casting slab, the cut continuous casting slab is transported to the molten salt tank for quenching to realize rapid cooling of the continuous casting slab surface. Among them, the temperature at which the continuous casting slab enters the molten salt tank is 1050°C, the temperature of the molten salt is 560°C, and the viscosity of the molten salt is 3.7cp. The molten salt is a mixed molten salt of carbonate, wherein the mass ratio of potassium carbonate, sodium carbonate and lithium carbonate is 1:1:1. The residence time of the continuous casting slab in the molten salt tank, that is, the surface quenching time is 10 minutes.

[0059] (2) After the quenched continuous casting slab is exported to the molten salt ...

Embodiment 2

[0067] The method of the present invention is used in the production of high-end cold heading steel in the continuous casting billet workshop, including the cooling process with the following steps:

[0068](1) After flame cutting and cut-to-length cutting of the continuous casting billet, the cut continuous casting billet is transported to the molten salt tank for quenching to realize rapid cooling of the continuous casting billet surface. Among them, the size of the billet is 160×160mm, the temperature of the continuous casting billet entering the molten salt tank is 900°C, the temperature of the molten salt is 450°C, and the viscosity of the molten salt is 1.5cp. The molten salt is a mixed molten salt of nitrate, wherein the mass ratio of sodium nitrate, potassium nitrate and calcium nitrate is 4:3:1. The residence time of the continuous casting billet in the molten salt tank, that is, the surface quenching time is 3 minutes.

[0069] (2) After the quenched continuous cast...

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Abstract

The invention provides a surface treatment method of a continuous casting blank. The surface treatment method comprises the cooling process provided with the following steps that: (1) after flame cutting and sizing cutting are conducted on the continuous casting blank, the cut continuous casting blank is sent to a molten salt trough to be quenched, and quick cooling of the surface of the continuous casting blank is achieved; and (2) after the quenched continuous casting blank is transferred out of the molten salt trough, residual salt on the surface is cleaned, and cooling of the continuous casting blank is completed. The problem of surface cracks of the continuous casting blank can be solved through the surface treatment method, and meanwhile the stability of the technology can also be guaranteed to the maximum extent. In addition, according to the preferred scheme of the surface treatment method of the continuous casting blank, waste heat can be further recycled while surface quenching is conducted on the continuous casting blank.

Description

technical field [0001] The invention relates to the technical field of metal material processing, in particular to a surface treatment method for continuous casting slabs. Background technique [0002] How to improve the internal quality of steel-making continuous casting slabs is an eternal topic in the development of steel mills, especially the micro-cracks on the surface and subcutaneous of continuous casting slabs are directly inherited to rolled products. For automobile plates, pipeline steels, cold heading steels, and gear steels As well as low-carbon micro-alloy steel and other steel types mainly composed of Al-deoxidized steel, the surface micro-cracks of continuous casting slabs have always troubled the surface control of rolled products in rolling mills. In order to save energy, reduce consumption and shorten the production cycle, most iron and steel enterprises adopt continuous casting slab hot delivery method for surface treatment. However, a large number of pro...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/607C21D9/00F22B1/02F22B1/04F27D17/00
CPCC21D1/18C21D1/607C21D9/0081F22B1/028F22B1/04F27D17/004F27D2017/007Y02P10/25
Inventor 任冬冬孙佳杜少欣佟秀俊佟春梅
Owner 北京勤泽鸿翔冶金科技有限公司
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