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Continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystal and production method

A continuous casting and rolling, ferrite technology, applied in the direction of metal rolling, metal rolling, manufacturing tools, etc., can solve the problems of deteriorating the microstructure and properties of the finished strip, short transformation time, mixed crystals, etc., and improve the microstructure. The uniformity of performance, the effect of increasing the added value of products and expanding the scope of application

Pending Publication Date: 2022-04-05
CISDI ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the typical continuous casting and rolling production lines are basically designed based on the traditional austenite rolling process, and it is difficult to realize ferrite rolling. Transformation has realized the ferrite rolling of part of the finish rolling stand. Based on the deficiency of partial ferrite rolling, some researchers have proposed a variety of thin slab continuous casting and continuous production lines that can perform full ferrite rolling of finish rolling. Scheme and production method
[0004] The current thin slab continuous casting and rolling ferritic rolling scheme, whether it is part-stand ferritic rolling for finishing rolling or full ferritic rolling for finishing rolling, has a common problem: the rolled piece is transformed from austenite to iron During the phase transformation process of ferrite, the temperature drop is faster, the phase transformation time is shorter, and the transformation from austenite to ferrite is not sufficient. When the rolled piece enters the rolling mill at the temperature of ferrite zone for rolling, the phase transformation does not actually occur. Fully completed, rolling in the two-phase region will occur, resulting in mixed crystals and deteriorating the microstructure and properties of the finished strip

Method used

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  • Continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystal and production method
  • Continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystal and production method
  • Continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystal and production method

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Embodiment 1

[0030] see figure 2 , the continuous casting and rolling production line in this embodiment includes a continuous casting machine 1, a roller hearth tunnel furnace 101, a high-pressure water descaling box 102, a rough rolling unit 2, a pendulum shear 103, and a waste pushing device arranged in sequence along the rolling direction 104. Accident shear with looper 105, induction heating device 106, high-pressure water descaling box 107, intermediate blank heat preservation device 3, finishing rolling unit 4, post-rolling cooling device 5, high-speed flying shear 6 and coiling unit 7; , the intermediate billet heat preservation device can adopt a gas protection heating furnace or a vacuum heating furnace. In this embodiment, a nitrogen protection heating furnace is selected, and the length of the furnace body is selected as 15m, which can make the intermediate billet in the furnace heat preservation or slow cooling for more than 5s, and avoid the intermediate billet Surface oxida...

Embodiment 2

[0037] see image 3 , the continuous casting and rolling production line in this embodiment includes a continuous casting machine 1, a pendulum shear 201, a roller hearth tunnel furnace 202, a high-pressure water descaling box 204, a rough rolling unit 2, and a drum shear that are arranged in sequence along the rolling direction. 205, high-pressure water descaling box 206, rapid cooling device 207, intermediate billet heat preservation device 3, finishing rolling unit 4, post-rolling cooling device 5, high-speed flying shear 6 and coiling unit 7. The roller hearth tunnel furnace 202 also includes a laterally movable slab pushing unit 203 . Intermediate billet heat preservation device 3 In this embodiment, a nitrogen-protected heating furnace is selected, and the length of the furnace body is selected as 15 m, which can keep the intermediate billet in the furnace for more than 5 seconds and avoid surface oxidation of the intermediate billet. The rough rolling unit 2 includes 2...

Embodiment 3

[0042] see Figure 4 , the continuous casting and rolling production line in this embodiment includes a continuous casting machine 1, a high-pressure water descaling box 301, a rough rolling unit 2, a pendulum shear 302, a waste pushing device 303, an induction heating device 304, High-pressure water descaling box 305, rough rolling unit 2, induction heating device 306, accident shear with looper 307, high-pressure water descaling box 308, intermediate billet heat preservation device 3, finishing rolling unit 4, post-rolling cooling device 5, high-speed Flying shear 6 and coiling unit 7. Intermediate billet heat preservation device 3 In this embodiment, a nitrogen-protected heating furnace is selected, and the length of the furnace body is selected as 15 m, which can keep the intermediate billet in the furnace for more than 5 seconds and avoid surface oxidation of the intermediate billet. The rough rolling unit 2 includes 2 to 6 rough rolling stands, 4 stands are selected in ...

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Abstract

The invention belongs to the technical field of metallurgical processes and equipment, and relates to a continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystals and a control method. The invention discloses a continuous casting and rolling production line capable of avoiding ferrite rolling mixed crystals. The continuous casting and rolling production line comprises a continuous casting machine, a roughing rolling unit, an intermediate billet heat preservation device, a finishing rolling unit, an after-rolling cooling device, a high-speed flying shear and a coiling unit which are sequentially arranged along a rolling line. A rolled piece heating device, a descaling device, an accident handling device, an intermediate billet cooling device and the like can be arranged on the production line according to needs. The intermediate billet heat preservation device is arranged in front of a finishing mill group, the temperature of the intermediate billet when reaching an inlet of the intermediate billet heat preservation device is controlled to be below the ferrite phase change temperature, the heating temperature of the intermediate billet heat preservation device is controlled, the intermediate billet is subjected to heat preservation or slow cooling in the device, the austenite-ferrite phase change time is prolonged, and the production efficiency is improved. And phase change is fully carried out, mixed crystals caused by double-phase rolling are avoided, and the structure property uniformity of a ferrite rolled product is improved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology and equipment, and in particular relates to a continuous casting and rolling production line and a production method that avoid ferrite rolling mixed crystals. Background technique [0002] In the field of hot-rolled strip steel production, compared with traditional hot continuous rolling, the thin slab continuous casting and rolling process has short process flow, low energy consumption and high yield, which has significant advantages. Since the first CSP production line was put into operation at the Nucor steel plant in the United States in 1989, the thin slab continuous casting and rolling process has developed rapidly. According to statistics, 67 102-strand thin slab continuous casting and rolling lines have been built in the world, with an annual production capacity of 110 million tons; my country also has a total of 20 36-strand thin slab continuous casting and rolling produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/46B21B45/00B21B37/74B21B45/08B21B15/00
CPCY02P70/10
Inventor 张万里韩会全
Owner CISDI ENG CO LTD
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