A method for producing cold-rolled products with low consumption, corrosion resistance and high surface quality

Abstract

The invention relates to a production method of a low-consumption corrosion-resistant high-surface-quality cold-rolled product. The method specifically includes the following steps: uncoiling via an uncoiler; breaking oxides on the surface of strip steel via a leveler; further breaking and stripping the oxides via a multi-roll straightener; removing the oxides via scrubbing rolls in a scrubbing device; subjecting the leveled, straightened and scrubbed strip steel to acid pickling; feeding the strip steel into a mechanical lapping device for repairing surface defects; feeding the strip steel into a mechanical plate surface residue removing device for mechanical surface residue clearing; performing cold rolling; recoiling via a recoiler. Through the method, convenience is brought to rapid permeation of acid liquor, and efficiency of acid pickling is improved; part of the oxides is removed, reacting dose of acid pickling is decreased, and acid consumption is lowered; the added value of yield strength of the strip steel after scale breaking is lowered, and performance of the strip steel is basically unaffected; through mechanical surface lapping, surface quality of the product is improved; by virtue of mechanical surface residue clearing, corrosion resistance of the strip steel is enhanced.

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 production method of cold-rolled products with low consumption, corrosion resistance and high surface quality. Background technique [0002] like figure 1 As shown, the traditional pickling unit is composed of uncoiler 1, inlet looper 2, tension leveler 3, pickling 4, rinse 30, exit looper 5, continuous rolling mill 23 and coiler 6, and the tension leveler 3 Mechanical descaling, limited by the effect of descaling, the pickling time of the unit is long and the efficiency is low, which greatly restricts the increase of rolling speed. After pickling 4, the acid solution remains seriously. After the residual acid enters the rolling mill, it will pollute the emulsion and reduce the quality of cold-rolled products. corrosion resistance. [0003] like figure 2 As shown, the main reason for the low efficiency and high acid ...

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Problems solved by technology

[0006] like image 3 , Figure 4 and Figure 5 As shown, after pickling 4, the main reason for the poor surface quality of the product is that the final surface of the product is a direct chemical reaction surface. 8 are Fe 2 o 3 31. Fe 3 o 4 32. FeO 33, the above three oxides 8 have different degrees of difficulty in reacting with acid, and the FeO 33 located in the lowest layer is the most likely to react with pickling 4. In this state, the acid solution reacts with oxide 8 and the The reaction time of the steel 7 body is basically the same, and the surface quality of the 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 FeO 33 have different reaction times with the acid solution, resulting in uneven reaction between the acid solution and the strip steel 7, resulting in the surface quality of the strip steel 7 after pickling 4 cannot meet the use requirements of most products

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