A kind of production method of pickling-reducing steel

Inactive Publication Date: 2011-12-07
HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, when iron and steel enterprises produce cold-rolled materials, they control the subsequent pickling process to improve the surface

Method used

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  • A kind of production method of pickling-reducing steel
  • A kind of production method of pickling-reducing steel
  • A kind of production method of pickling-reducing steel

Examples

Experimental program
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Example Embodiment

[0039] Example 1: A relatively pure molten steel is obtained by smelting, and then continuously casted into a slab through a continuous casting machine. The weight percentage of the composition is: C: 0.045%, Si: ≤0.023%, Mn: 0.21%, P: ≤0.015 %, S: ≤0.004%, Als: 0.02%.

[0040] Heat the cast slab to 1190°C and keep it for 30 minutes, then turn on the high pressure water for descaling, and the pressure is 19Mpa; the cast slab after descaling is subjected to 3+3 rough rolling, the rough rolling opening temperature is 1170°C, and the final rolling temperature It is 1020℃ to ensure that the secondary descaling water pressure is not less than 18Mpa; after the rough rolling mill, the heat preservation cover is fully opened, the temperature setting of the finishing rolling inlet is 990℃, and the cooling water between the stands is opened for 3-4 groups. The temperature setting value of the finish rolling exit is 880℃, the thickness range is 4.5-3.5mm, and the finish rolling exit speed i...

Example Embodiment

[0041] Example 2: A relatively pure molten steel is obtained by smelting, and then continuously cast into a slab through a continuous casting machine. The weight percentages of the components are: C: 0.033%, Si: 0.015%, Mn: 0.22%, P: ≤0.0104% , S: ≤0.0156%, Als: 0.0189%.

[0042] Heat the cast slab to 1180℃ for 40 minutes, then turn on the descaling high-pressure water at a pressure of 20bar; the cast slab after descaling is subjected to 3+3 rough rolling, the roughing opening temperature is 1170℃, and the final rolling temperature It is 1010℃ to ensure that the secondary descaling water pressure is not less than 19Mpa; after the rough rolling mill, the heat preservation cover is fully opened, the temperature setting of the finishing rolling inlet is 990℃, and the cooling water between the stands is opened for 3-4 groups. The temperature setting value of the finishing rolling exit is 874℃, the temperature setting value of the finishing rolling exit is 880℃, and the thickness rang...

Example Embodiment

[0043] Example 3: A relatively pure molten steel is obtained by smelting, which is then continuously cast into a slab by a continuous casting machine. The weight percentages of the components are: C: 0.032%, Si: ≤ 0.011%, Mn: 0.177%, P: 0.0087%, S: 0.010%, Als: 0.0209%.

[0044] Heat the cast slab to 1200°C for 20 minutes, then turn on the descaling high-pressure water at a pressure of 20 Mpa; the cast slab after descaling is subjected to 3+5 rough rolling, the rough rolling opening temperature is 1180°C, and the final rolling The temperature is 1020℃, to ensure that the secondary descaling water pressure is not less than 20Mpa; after the rough rolling mill, the heat preservation cover is fully opened, the temperature setting of the finishing rolling entrance is 1100℃, and the cooling water between the stands is opened for 3-4 groups. The temperature setting of the finishing rolling exit is 890℃, the thickness range is 3.0-2.5 mm, and the finishing exit speed is increased by 9% c...

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Abstract

The invention relates to a production method for pickling steel with reduced acid and belongs to the technical field of metal rolling. The technical scheme is that: a FeO eutectoid reaction curve in a scale microstructure in the hot rolling process of target steel is formed; a rolling process is controlled, optimized and adjusted according to the FeO eutectoid reaction curve in the scale microstructure in the hot rolling process of the target steel; and the scale microstructure is changed, the generation of Fe2O3 which is difficult to pickle is reduced, the pickling speed is improved in the pickling process, and acid consumption of each ton of steel is reduced to pickle steel with acid. The invention has the advantages that: the scale is well controlled in the hot rolling process, and thesurface quality of a hot rolled strip coil and labor productivity are greatly improved; and the scale microstructure is changed, the generation of Fe2O3 which is difficult to pickle is reduced, the pickling speed is improved by 10 percent in the subsequent pickling process, and the acid consumption of each ton of steel is reduced by 7.5 percent. The pressure of excessive waste acid emission on the environment is greatly lightened, and the method has the advantages of energy conservation, emission reduction and great social benefit.

Description

technical field [0001] The invention relates to a production method of pickling-reduction steel, which belongs to the technical field of metal rolling. Background technique [0002] At present, when iron and steel enterprises produce cold rolling preparations, they control the subsequent pickling process to improve the surface quality of pickled strip steel, resulting in excessive acid consumption in the subsequent pickling process and causing a heavy load on the environment. The typical oxide scale structure of hot-rolled strip steel consists of the outermost thinner Fe 2 o 3 layer, intermediate Fe 3 o 4 layer and the FeO layer near the substrate side. According to the Fe-O equilibrium phase diagram, at 570-1371°C, FeO is in a stable state; below 570°C, FeO undergoes eutectoid reaction 4FeO→a-Fe+Fe 3 o 4 . During the pickling process, FeO is most likely to be reduced and decomposed, and Fe 3 o 4 Second, Fe 2 o 3 The hardest to be decomposed by acid reduction. ...

Claims

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Application Information

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IPC IPC(8): B21B37/00C22C38/06
Inventor 彭兆丰许斌吝章国刘红艳孙洪利贾耿伟年保国吴增强杨志敏李守华
Owner HBIS COMPANY LIMITED HANDAN BRANCH COMPANY
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