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Production method for pickling steel with reduced acid

A production method and pickling reduction technology, applied in rolling mill control devices, metal processing equipment, metal rolling, etc., can solve problems such as high acid consumption and environmental load, achieve huge social benefits, reduce production, and reduce pressure Effect

Inactive Publication Date: 2013-06-19
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 quality of pickled strip steel, resulting in excessive acid consumption in the subsequent pickling process and causing a heavy load on the environment.

Method used

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  • Production method for pickling steel with reduced acid
  • Production method for pickling steel with reduced acid
  • Production method for pickling steel with reduced acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0040] Heat the slab to 1190°C, keep it warm for 30 minutes, then turn on all the high-pressure water for descaling, and the pressure is 19Mpa; the slab after descaling is subjected to rough rolling for 3+3 times, the rough rolling start temperature is 1170°C, and the final rolling temperature The temperature is 1020°C, ensuring that the pressure of the secondary descaling water is not less than 18Mpa; after exiting the rough rolling mill, the insulation cover is fully opened, the temperature at the entrance of the finish rolling is set at 990°C, and the cooling water between the stands is opened for 3-4 groups. The temperature setting value of the finish rolling exit is 880°C, and the thickness range is 4.5-3.5mm. The fini...

Embodiment 2

[0041] Example 2: Purified molten steel is obtained by smelting, and then continuously cast into a slab through a continuous casting machine, and its composition weight percentage is: C: 0.033%, Si: 0.015%, Mn: 0.22%, P: ≤ 0.0104% , S: ≤0.0156%, Als: 0.0189%.

[0042] Heat the slab to 1180°C, keep it warm for 40 minutes, and then turn on all the descaling high-pressure water at a pressure of 20bar; the slab after descaling is subjected to rough rolling for 3+3 times, the rough rolling start temperature is 1170°C, and the final rolling temperature The temperature is 1010°C, ensuring that the pressure of the secondary descaling water is not less than 19Mpa; after exiting the rough rolling mill, the heat preservation cover is fully opened, the temperature setting value of the finish rolling entrance is 990°C, and the cooling water between the stands is opened for 3-4 groups. The temperature setting value of the finish rolling exit is 874 °C, the temperature setting value of the f...

Embodiment 3

[0043] Example 3: Purified molten steel is obtained by smelting, and then continuously cast into a slab through a continuous casting machine. The composition weight percentages are: C: 0.032%, Si: ≤0.011%, Mn: 0.177%, P: 0.0087%, S: 0.010%, Als: 0.0209%.

[0044] Heat the slab to 1200°C, keep it warm for 20 minutes, and then turn on all the descaling high-pressure water at a pressure of 20 Mpa; the slab after descaling is subjected to rough rolling for 3+5 times, the rough rolling start temperature is 1180°C, and the final rolling The temperature is 1020°C, ensuring that the pressure of the secondary descaling water is not less than 20Mpa; after exiting the rough rolling mill, all the heat preservation covers are opened, the temperature setting value of the finish rolling entrance is 1100°C, and the cooling water between the stands is opened for 3-4 groups. The temperature setting value of the finish rolling exit is 890°C, and the thickness range is 3.0-2.5 mm. The finish roll...

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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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Patent Type & Authority Patents(China)
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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