A kind of production method of low acid consumption to replace cold strip product with heat

Abstract

The invention relates to a low-acid-consumption band steel production method by adopting a hot way to substitute for a cold way. The production method comprises the following steps: uncoiling band steel by an uncoiling machine; crushing and stripping oxide on the surface of the band steel by a leveling machine; further crushing and stripping the oxide on the surface of the band steel by a multi-roll straightening machine; clearing the stripped and loosened oxide on the surface of the band steel by a brushing roll in a brushing device; pickling and rinsing the leveled, straightened and brushed band steel; homogenizing the surface coarseness of the pickled band steel through a polishing machine; and coiling the processed band steel to obtain a finished product by a coiling machine. Through the scheme, acid liquid in the pickling process can rapidly permeate into the band steel, and thus the pickling efficiency can be improved; the oxide which is already separated from a band steel body but not stripped is further removed through the brushing process, so that the acid reaction quantity is greatly reduced, and the acid consumption is reduced; the yield strength of the processed band steel is slightly increased, and the performance of the band steel is basically not influenced; the frequently occurring LUDERS defect of an ordinary hot-rolled product can be avoided.

Description

technical field [0001] The invention relates to the technical field of deep processing of ordinary hot-rolled flat materials, in particular to a production method of low-acid consumption and substituting heat for cold strip steel products. Background technique [0002] Hot-rolled steel strips undergo surface treatment to remove oxides on the surface of the plate, and then use a skin pass machine to replace some cold-rolled products for use in construction, automobiles, home appliances and other fields. This product has a great cost competitive advantage, such as figure 1 The pickling and tempering unit shown above produces the above products. The conventional pickling and tempering unit consists of uncoiler 1, entrance looper 2, tension leveler 3, pickling 4, rinse 30, exit looper 5, skin pass machine and coiler 6. The tension leveler 4 is used for mechanical descaling. The descaled steel strip 7 enters the pickling 4. After the pickling 4, the surface finishing treatment is...

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Problems solved by technology

[0004] Therefore, in the process of pickling 4, it is difficult for the acid solution in the pickling tank to penetrate into the FeO layer from the closed oxide crack 9 and react with it, thus causing the efficiency of pickling 4 to be very low. For pickling efficiency, it is necessary to set the elongation of the tension leveler 3 above the yield limit of the strip steel 7, so that the strip steel 7 produces plastic deformation. In this working condition, the strip steel 7 can be Partially maintain the gaps of surface oxide 8 to improve pickling efficiency, but the performance loss of strip steel 7 products is serious

[0005] like image 3 As shown, for conventional hot-rolled sheets with carbon, nitrogen and other interstitial atoms content ≥ 30ppm, uneven surface yield will occur on the surface of strip steel 7 after entering the tension leveler 3, commonly known as Lüders strip 10; for high-strength steel, IF steel Although the produced steel strip 7 will not produce Lüders strip 10 on the surface of the strip steel 7, since its yield strength increases unidirectionally with the increase of the elongation, increasing the elongation will undoubtedly deteriorate the product performance

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