Pickling method of complex phase steel

Abstract

The invention discloses a pickling method of complex phase steel. The method comprises pickling. A steel strip passes a first pickling groove, a second pickling groove, a third pickling groove, a fourth pickling groove and a fifth pickling groove arranged successively. Hydrochloric acid solutions are contained in the first pickling groove, the second pickling groove, the third pickling groove, thefourth pickling groove and the fifth pickling groove. Concentrations of hydrochloric acid are successively 40-50 g / L, 60-80 g / L, 80-100 g / L, 100-120 g / L and 130-160 g / L. Temperatures of hydrochloricacid are successively 75-85 DEG C, 73-83 DEG C, 70-80 DEG C, 70-80 DEG C and 70-80 DEG C. The pickling method reduces the probability of black spots and under-pickling quality defect in the pickling process greatly, is good in application effect, can lower the production cost greatly, improves the market competitiveness of a product and has good application value.

Description

Technical field

[0001] The invention belongs to the technical field of steel rolling, and particularly relates to a pickling method for complex phase steel. Background technique

[0002] With the increasingly stringent requirements of the automotive industry for lightweight, safety, and low emissions, the proportion of advanced high-strength steel used in new automotive models continues to increase. 800MPa hot-rolled pickled multiphase steel not only has high tensile strength, but also has high hole expansion performance and good welding performance. It can be widely used in the production of automobile chassis suspension parts, bumpers, seat slides and other parts , Has broad development prospects. However, the production of 800MPa grade complex phase steel is difficult, the product certification cycle is long, and the market access threshold is high. There are almost no domestic steel companies that have passed the certification of foreign high-end automobile manufacturers. [...

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