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A continuous casting billet hot delivery and hot charging process

A technology of continuous casting slab and process, which is applied in the field of continuous casting slab hot delivery and hot charging, can solve the problems that it is difficult to ensure the production of high-quality steel, the waste heat of continuous casting slab cannot be fully utilized, and the cooling rate of continuous casting slab is fast, etc. Achieve the effects of reducing oxidation burning loss, shortening heating time and reducing fuel consumption

Inactive Publication Date: 2016-05-25
张学一
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this invention is that the cooling rate of the continuous casting slab is too fast, which easily leads to cracks on the surface of the slab, making it difficult to meet the requirements of high-quality steel production
The disadvantage of this method is that the temperature of hot feeding and hot charging is low, which leads to the inability to fully utilize the waste heat of continuous casting slabs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Before the direct loading process of the 320mm×1800mm medium carbon C-Mn-Nb-Al steel continuous casting slab in a steel plant, the incidence of surface cracks on the 25-40mm steel plate produced by the ordinary hot-feeding and hot-charging process is in 13.6%. After adopting the direct loading process of the present invention, the surface temperature of the continuous casting billet before cooling is 730-750°C, which is higher than the Ar3 temperature of the produced steel grade. Rapid cooling is achieved on the continuous casting roller table through the water nozzle, and the cooling rate is 4 ℃ / s, the surface temperature of the continuous casting slab is cooled to 480℃, and then heated on the roller table after 10 minutes of re-temperature. The thickness of the steel plate after rolling is 20-40mm, and there is no crack on the surface of the steel plate.

Embodiment 2

[0019] Before adopting the direct loading process of the present invention for 150mm×1200mm medium carbon C-Mn-Al steel continuous casting slabs of a steel plant, the 7-10mm coils produced by the ordinary hot feeding and hot charging process were sampled and uncoiled and found that, The surface crack rate of the coil is about 10.2%. After adopting the direct feeding process of the present invention, the surface temperature of the continuous casting slab before cooling is 650-680°C, which is lower than the Ar3 temperature of the produced steel grade, and rapid cooling is achieved on the continuous casting roller table through the water nozzle, and the cooling rate is 2 ℃ / s, the surface temperature of the continuous casting slab is cooled to 480℃, and then heated on the roller table after 5 minutes of reheating. After rolling, the thickness of the coil is 6-10mm, and the coil is sampled for uncoiling inspection, and no cracks are found on the surface of the coil.

Embodiment 3

[0021] A steel mill adopts the hot charging and hot delivery process of the present invention for the 300mm×2200mm medium carbon aluminum killed steel continuous casting slab. The surface temperature of the continuous casting slab before cooling is 880-910℃, and the rapid water spray cooling is performed on the conveying roller table. , The cooling rate is 20℃ / s, the cooling time is 60 seconds, the surface temperature of the continuous casting slab is cooled to 560℃, and then the continuous casting slab is sent to the heating furnace for heating within 10 minutes. The thickness of the steel plate after rolling is 40-70mm, and there is no crack defect on the surface of the steel plate. Compared with cold charging furnace continuous casting billets, the process of the invention can save energy by 50%.

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Abstract

The invention provides a continuous casting billet hot delivery and hot charging process and solves the problem that products in the prior art are not stable enough in performance. The quality of casting blanks is guaranteed while the effects of energy saving and environmental production are achieved, and meanwhile, the fuel consumption of a casting blank heating furnace is reduced and the output of the casting blank heating furnace is increased; the surface oxidation burning loss amount of casting blanks is reduced; the time for heating the casting blanks in the furnace is reduced and thus the surface oxidation burning loss amount of the casting blanks is reduced relatively; generally the burning loss amount of a cold charging furnace is 1.5%-2.0%, sometimes more than 2.5%; under the condition of a hot charging furnace, the burning loss amount can be reduced to 0.5%-0.7%, so that the yield of the casting blanks is increased.

Description

Technical field [0001] The invention belongs to the technical field of metal material processing, and particularly relates to a continuous casting billet hot delivery and hot charging technology. Background technique [0002] Hot delivery and hot charging of continuous casting slabs refers to the direct delivery of high-temperature qualified slabs to a heating furnace for heating and then "hot rolling", which has the obvious advantages of low energy consumption and good benefits. The hot delivery and hot charging technology of continuous casting billet was proposed by the United States in the late 1960s. It was implemented in Japan in the early 1970s and quickly developed. It was then promoted in some European countries. my country started to formally in the early 1990s. Applied. Saving energy, increasing the output of heating furnaces, accelerating the pace of rolling, improving the efficiency of rolling steel production, reducing slab burning loss, shortening the material flow ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/16
Inventor 张学一
Owner 张学一
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