A pickling process with high surface quality and low board surface residue

Abstract

The invention relates to a high-surface-quality low-surface-residue pickling technique. The technique specifically includes the following steps: uncoiling via an uncoiler; breaking and stripping oxides on the surface of strip steel via a withdrawal and straightening unit; subjecting the strip steel to pickling; feeding the strip steel subjected to pickling into a mechanical grinding device for mechanical surface grinding; feeding the ground strip steel into a mechanical surface residue removing device for removing surface residues; then feeding the strip steel into a finishing machine for surface roughness uniformization finishing treatment; recoiling via a recoiler. Through the technique, the surface of the strip steel is subjected to mechanical surface grinding repair via the mechanical grinding device, so that surface quality of the strip steel is high; the mechanical surface residue removing device is adopted to remove surface residues of acid liquor, so that corrosion resistance of the strip steel is enhanced; with the aid of the mechanical surface residue removing device, rinsing at normal temperature is realized, and production consumption is lowered; the strip steel is low in temperature when entering a leveler, and profile quality of a final product is guaranteed beneficially.

Description

technical field [0001] The invention belongs to the technical field of deep processing of ordinary hot-rolled flat materials, and in particular relates to a pickling process method with high surface quality and low board surface residue. Background technique [0002] During the production process of hot-rolled strip steel, the Fe atoms on the surface of the strip steel will react with the oxygen in the air to produce oxide scales. In the existing technology, the surface of the hot-rolled strip steel is treated by pickling to remove surface oxides. The hot-rolled steel strip after pickling can be used directly or become a cold-rolled product after being cold-rolled. [0003] Such as figure 1 , figure 2 and image 3 As shown, in an ideal state, the oxides on the surface of strip steel 7, the oxides from the surface layer to the inner layer are respectively Fe 2 o 3 31. Fe 3 o 4 32. FeO33, the above three oxides have different degrees of difficulty in reacting with acid...

AI Technical Summary

Problems solved by technology

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

[0005] In order to reduce the acid residue, the multi-stage rinsing method is traditionally used to clean the steel strip, and the rinsing temperature is continuously increased during the rinsing process to increase the kinetic energy of the molecules in the rinsing tank and accelerate the diffusion of the acid liquid. Generally, the rinsing temperature of the last stage of rinsing is 85° About C, additionally increases the energy consumption of the production process

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