A production method of low-acid-consumption corrosion-resistant hot-rolled pickling products

Abstract

The invention relates to a production method of low-acid-consumption corrosion-resistant hot-rolled pickling products, which specifically comprises the following steps: uncoiling by an uncoiler; crushing and stripping oxides on the surface of strip steel by a tempering machine; The oxides on the surface are further broken and peeled off; the brushing device removes the peeled and loose oxides on the surface of the strip; pickling and rinsing the treated strip; then mechanically removes the residue on the surface of the strip; the coiler coils Pick. Through this technical scheme, 1. There are many oxide cracks and large gaps on the surface of the strip, which facilitates the rapid penetration of acid solution and high pickling efficiency; 2. While breaking phosphorus, part of the oxides are removed, reducing the amount of pickling reaction and acid consumption. 3. The increased value of the yield strength of the strip steel after processing is low, and the performance of the strip steel is basically not affected; 4. The flattening process eliminates the yield platform of the strip steel and avoids the formation of Lüders bands on the surface of ordinary hot-rolled products; 5. Reduces The chloride ion residue on the surface of the product is eliminated, and the product has good corrosion resistance.

Description

technical field [0001] The invention belongs to the field of deep processing of ordinary hot-rolled flat materials, and in particular relates to a production method of low-acid-consumption, corrosion-resistant, hot-rolled pickled products. Background technique [0002] In the existing technology, such as figure 1 As shown, the traditional pickling unit consists of an uncoiler 1, an inlet looper 2, a tension leveler 3, pickling 4, a rinse 30, an exit looper 5, and a coiler 6. The tension leveler 3 is configured at the entrance for mechanical breaking Scale, after the scale breaking, the strip steel becomes a hot-rolled pickling product after pickling 4 and rinsing for 20 minutes. This production process has the following defects. The unsatisfactory scale breaking effect leads to low pickling efficiency; Seriously, reduce the corrosion resistance of the product. [0003] Such as figure 2 As shown, the main reason for the low efficiency and high acid consumption of pickling...

AI Technical Summary

Problems solved by technology

These residual chloride ions will seriously corrode the surface of steel strips, making the surface of steel strips yellow or yellow-green spots, and these strips are not as bright as normal strips after rolling, and the finished products are also prone to re-corrosion

[0006] In order to reduce acid residue, the strip steel 7 is traditionally cleaned by multi-stage rinsing 30 , and the temperature of rinsing 30 is continuously raised during the rinsing 30 , increasing the kinetic energy of molecules in the rinsing 30 tank, and accelerating the diffusion of acid solution. Generally, the last stage rinsing 30 The rinsing temperature is about 85°C, which increases the energy consumption of the production process. Even so, from the actual production situation, the acid concentration in the final rinse 30 tank is still 100mg / l-150mg / l

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