A strip steel surface oxide removal method with low acid consumption and high surface quality

Abstract

The invention relates to a method for surface oxide removal of low-acid-consumption high-surface-quality strip steel. The method specifically includes the following steps: uncoiling via an uncoiler; breaking and stripping oxides via a leveler; further breaking and stripping the oxides via a multi-roll straightener; removing the shed and loose oxides of the surface of the strip steel via scrubbing rolls in a scrubbing device; subjecting the leveled, straightened and scrubbed strip steel to acid pickling and rinsing; feeding the strip steel subjected to acid pickling into a mechanical grinding device for surface grinding to have surface defects repaired; recoiling the treated strip steel into a finished product. Through the method, the surface oxides of the treated strip steel have more cracks, convenience is brought to rapid permeation of acid liquor in an acid tank, and efficiency of acid pickling is improved; part of the oxides is removed while scale breaking, reacting dose of acid pickling is decreased, and acid consumption is lowered; the added value of yield strength of the strip steel after machining is lowered, and performance of the strip steel is basically unaffected; Luders frequently formed on the surface of a common hot-rolled product is completely eradicated; through mechanical grinding after acid pickling, surface quality of the strip steel is improved.

Description

technical field [0001] The invention belongs to the technical field of deep processing of ordinary hot-rolled flat materials, in particular to a strip steel surface oxide removal method with low acid consumption and high surface quality. 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, and the tension leveler 3 is used for mechanical scale breaking , forming oxide cracks 9 on the surface oxide 8 of the strip steel 7, but this method of descaling has many problems such as unsatisfactory descaling effect and great damage to product performance, and the tension leveler 3 can only be used on the strip 7 Oxide cracks 9 are formed on the surface oxides 8, and part of the oxides 8 on the surface of the strip steel 7 cannot be removed. All oxides 8 need to be removed by pickling 4. The amount o...

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Problems solved by technology

[0007] like Figure 5 and Image 6 As shown, in actual production, due to some Fe 3 o 4 32 will be deposited on the surface of strip steel 7, while Fe 3 o 4 32. The reaction time between FeO33 and acid solution is different, resulting in uneven reaction between acid solution and strip steel 7, resulting in the surface quality of strip steel 7 after pickling 4 cannot meet the use requirements of most products

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