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Slab surface quenching system and process based on horizontal section of continuous casting machine

A surface quenching and continuous casting machine technology, applied in the field of metallurgy, can solve the problems such as the inability to reheat the surface layer of the slab, the inability to achieve high plastic transformation of the microstructure, and the inability to change the size and distribution of carbonitride precipitation, etc., to achieve high efficiency. And green production, improve plasticity, the effect of stable effect

Pending Publication Date: 2022-07-12
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the surface structure of the slab at this temperature, microalloy carbonitrides containing Nb and Al have been precipitated, and the surface quenching of the slab at this temperature can no longer change the size and distribution of carbonitride precipitation.
At the same time, the surface of the slab is quenched at this temperature. On the one hand, the surface structure of the slab has begun to transform from austenite to ferrite. On the other hand, the surface structure of the slab after quenching cannot be austenitized again. Realize high plastic transformation of organizational structure

Method used

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  • Slab surface quenching system and process based on horizontal section of continuous casting machine
  • Slab surface quenching system and process based on horizontal section of continuous casting machine
  • Slab surface quenching system and process based on horizontal section of continuous casting machine

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Embodiment 1

[0053] like Figure 1 to Figure 3 As shown, this embodiment introduces a slab surface quenching system based on a horizontal section of a continuous casting machine, including: a quenching sector section, the quenching sector section is used to quench the surface of the slab 1; the continuous casting machine includes a pressing sector section , the quenching segment is located after the pressing segment, and the temperature of the surface of the slab 1 at the entrance of the quenching segment is above 930°C.

[0054] Further, the pressing segment in this embodiment generally refers to the light pressing segment, the quenching segment is a horizontal segment after the light pressing segment, and the slab 1 passes through the light pressing segment and the quenching segment successively, which can be understood as The surface temperature of the slab 1 at the entrance of the quenching sector is above 930°C. When there is a heavy pressing section after the light pressing section ...

Embodiment 2

[0090] This embodiment introduces the slab surface quenching system and process based on the horizontal section of the continuous casting machine with a specific example of a steel mill.

[0091] The slab 1 in this embodiment is a continuous casting with a section of 2100mm×250mm, namely L 1 is 2100mm. Under this section, the pulling speed of the mainstream continuous casting is 0.9-1.1 m / min, and the maximum pulling speed is 1.2 m / min. The continuous casting machine of the steel mill is designed with fourteen sectors, the solidification end point of slab 1 under the condition of the maximum pulling speed of 1.2m / min is located in the thirteenth sector, and the quenching sector in this embodiment is the tenth sector. Four sectors, the quenched sector is an improvement on the original fourteenth sector. The horizontal length of the fourteenth sector in the drawing direction is 2.1 m, and there are seven pairs of first casting rolls 17 and second casting rolls.

[0092] When ...

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Abstract

The invention discloses a slab surface quenching system and process based on a horizontal section of a continuous casting machine, and the slab surface quenching system based on the horizontal section of the continuous casting machine comprises a quenching fan-shaped section which is used for quenching the surface of a slab; the continuous casting machine comprises a pressing fan-shaped section, the quenching fan-shaped section is located behind the pressing fan-shaped section, and the temperature of the portion, at an inlet of the quenching fan-shaped section, of the surface of the plate blank is 930 DEG C or above. The quenching process is carried out on the surface of the plate blank through the quenching sector section arranged behind the pressing sector section, so that the temperature within the subcutaneous range of 0-10 mm of the upper and lower surfaces of the microalloyed steel continuous casting plate blank subjected to online quenching is rapidly reduced to below 600 DEG C from above 930 DEG C; the purposes of dispersive precipitation of carbonitride and conversion of the structure from austenite to ferrite or bainite are achieved, the plasticity of the surface structure of the casting blank is fundamentally improved, and the generation of hot-delivery cracks of the microalloyed steel plate blank is radically treated.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a slab surface quenching system and process based on a horizontal section of a continuous casting machine. Background technique [0002] The continuous casting billet hot feeding and hot charging process is an important production process for efficiently connecting the steel-rolling interface of iron and steel enterprises. Compared with the traditional "casting billet off-line → stack cooling → heating furnace heating" process, this process has the advantages of significantly reducing energy consumption, simplifying the process flow, and improving production efficiency. However, in the process of producing micro-alloyed steel containing Nb, Al, V and other components by the hot charging process, the surface of the slab will be heated in the heating furnace, and serious network crack defects (called "hot feeding cracks") will occur on the surface. Cause serious quality defects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/124B22D11/12B22D11/22C21D1/06C21D1/667C21D8/02C21D9/00C21D11/00
CPCB22D11/124B22D11/1246B22D11/225C21D1/667C21D9/0081C21D11/005C21D1/06C21D8/0205C21D8/0247B22D11/1206C21D2211/005C21D2211/002Y02P10/25
Inventor 蔡兆镇朱苗勇
Owner NORTHEASTERN UNIV LIAONING