A method for producing cold-rolled products with low acid consumption and high surface quality

Abstract

The invention relates to a production method of a low-acid-consumption high-surface-quality cold-rolled product. The method specifically includes the following steps: uncoiling via an uncoiler; breaking and stripping oxides on the surface of strip steel via a leveler; further breaking and stripping the oxides on the surface of the strip steel via a multi-roll straightener; removing the shed and loose oxides of the surface of the strip steel via a scrubbing device; subjecting the treated strip steel to acid pickling; subjecting the strip steel subjected to acid pickling to surface grinding; performing cold rolling on the treated strip steel; recoiling the strip steel rolled via a cold rolling mill into a finished product. Through the method, the oxides have more cracks and are large in clearance, convenience is brought to rapid permeation of acid liquor, and efficiency of acid pickling is improved; before the strip steel enters an acid tank, part of the oxides is removed, and acid consumption is low; surface quality of the final product is superior to that of a product machined by a common acid pickling and rolling unit; the added value of yield strength of the strip steel is low, and performance of the strip steel is basically unaffected; profile and texture uniformity of the strip steel are both improved, and profile accuracy of export cold-rolled products is enhanced beneficially.

Description

technical field [0001] The invention relates to the technical field of cold-rolled flat material processing, in particular to a production method of cold-rolled products with low acid consumption and high surface quality. Background technique [0002] In the existing technology, such as figure 1 As shown, the traditional pickling mill combination unit produces cold-rolled products, which consists of an uncoiler 1, an inlet looper 2, a tension leveler 3, pickling 4, an outlet looper 5, a continuous rolling mill 23 and a coiler 6. Rolled strip steel 7 undergoes a surface treatment process to remove oxides 8 on the surface of the plate, and then uses the continuous rolling mill 23 to produce cold-rolled products. It is necessary to reduce the speed and pass through the acid tank to increase the pickling time and ensure the surface quality of the strip 7 after pickling. Acid solution, calculated according to the average specification, the acid consumption per ton of steel is a...

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Problems solved by technology

[0007] like image 3 and Figure 4 As shown, in an ideal state, the oxide 8 on the surface of the steel strip 7, and the oxide 8 from the surface layer to the inner layer are respectively Fe 2 o 3 31. Fe 3 o 4 32 、 FeO33, the above-mentioned three kinds of oxides 8 have different degrees of difficulty in reacting with acid, and the FeO23 located at the bottom layer is the most likely to react with pickling 4. In this state, the acid liquid, oxide 8 and strip steel 7 body The reaction time is basically the same, and the surface quality of strip steel 7 after pickling 4 is uniform; however, in actual production, some Fe 3 o 4 32 will be deposited on the surface of strip steel 7, due to Fe 3 o 4 32 and FeO3 have different reaction times with the acid solution, resulting in an uneven reaction between the acid solution and the strip steel 7, resulting in the surface of the strip steel 7 after pickling 4 such as Figure 5 As shown, for products with this surface quality, after cold thinking, some of the above-mentioned surface defects still exist on the surface of the strip 7, thus restricting the improvement of the quality of cold-rolled products

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