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Production method of high-quality acid pickling strip steel

A production method and high-quality technology, applied in the field of strip steel pickling, can solve problems such as blackboard surface, incomplete removal of iron sheet, rust, etc., and achieve the effects of reducing under-pickling, shortening pickling time, and reducing consumption

Active Publication Date: 2022-05-13
BENGANG STEEL PLATES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common pickling defect is under-pickling, that is, the iron sheet on the surface of the raw material strip is not completely removed after pickling
In addition, there are pickling defects such as blackboard surface and rust

Method used

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  • Production method of high-quality acid pickling strip steel
  • Production method of high-quality acid pickling strip steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0049] A kind of production method of high-quality pickled steel strip, strip steel width 1320mm, specifically comprises the following steps:

[0050] 1. After coiling, the steel coil is naturally cooled to 45°C.

[0051] 2. Control the temperature of the pickling solution in the pickling process to 80°C.

[0052] 3. The strip steel speed in the pickling process section is 160m / min; in case of an accident, stop the process; the reddish-brown or carbon-black strip steel produced during the shutdown process will be removed as waste.

[0053] 4. The clamping pressure of the cylinders at both ends of the squeezing roller is 0.28Mpa; reduce the elastic deformation of the squeezing roller; reduce the amount of acid liquid brought out by the squeezing roller;

[0054] 5. It is required that the wear depth of the stretch straightening roller is ≤5mm, and the roller should be replaced when the wear depth of the stretch straightening roller exceeds 5mm;

[0055] When the stretching an...

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Abstract

The invention relates to a production method of high-quality acid-pickled strip steel. The production method comprises the following steps: 1, the temperature of a raw material steel coil on a machine is not lower than 30 DEG C; 2, controlling the temperature of a pickling solution in the pickling process to be 80-85 DEG C; 3, controlling the strip steel speed of the pickling process section to be greater than or equal to 110 m / min; shutdown treatment is carried out in case of accidents; 4, the clamping pressure of cylinders at two ends of the wringing roller is increased along with the increase of the width of the strip steel; elastic deformation of the wringing roller is controlled; 5, when the stretch straightening roll is abraded, the strip steel elongation corresponding to the abrasion loss of the stretch straightening roll is reduced; the wear depth of the stretch straightening roll is required to be less than or equal to 5mm, and the roll is replaced when the wear depth of the stretch straightening roll exceeds 5mm; 6, the abrasion height of the blocking stones at the two ends of the pickling tank is required to be smaller than one third of the height of the blocking stones, namely the abrasion height of the blocking stones does not exceed 50-54 mm. According to the method, the high pickling speed is obtained, the strip steel pickling quality is improved, and meanwhile the cooling time of raw materials in a warehouse area and the production cycle of products are shortened.

Description

technical field [0001] The invention relates to pickling of strip steel, in particular to a production method of high-quality pickling strip steel. Background technique [0002] Strip pickling is a part of the cold-rolled strip process, that is, the running strip removes iron scale in the acid solution in the acid tank, and then rinses and dries. The acid liquid in the acid tank is continuously injected into the acid tank, and crosses the retaining stone, enters the overflow tank at both ends, and then returns to the acid tank to form a cycle. The general flow direction of the acid solution is opposite to that of the steel strip: new acid→3# acid tank→2# acid tank→1# acid tank→acid treatment room. According to the order of 1-3# acid tank, the free acid concentration gradually increases, and the iron concentration (ferrous salt content) gradually decreases. The function of the squeeze roller is to reduce acid and water in the forward direction of the strip. Rinsing is to u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02C23G3/02
CPCC23G1/02C23G3/027
Inventor 王金鹏杜黎明于文爽刘杨侯珍珠穆喜龙侯立宁
Owner BENGANG STEEL PLATES
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