DDQ-grade hot-rolled pickling cold-formed steel and manufacturing method thereof

Abstract

The invention discloses DDQ-grade hot-rolled pickling cold-formed steel and a manufacturing method thereof, and belongs to the technical field of hot-rolled pickling cold-formed steel. The steel comprises the following chemical components including, by weight percent, smaller than or equal to 0.0020% of C, smaller than or equal to 0.03% of Si, 0.08%-0.25% of Mn, 0.005%-0.015% of P, 0.05%-0.015% ofS, 0.025%-0.045% of Als, smaller than or equal to 0.0040% of N, 0.030%-0.050% of Ti, 0.015%-0.030% of Nb, and the balance Fe and inevitable impurities. According to the steel, multiple elements are added on the basis of traditional hot-rolled cold-formed steel, the content of each element is reasonably adjusted, so that the yield strength and the tensile strength of the steel are improved to a certain extent, the ductility of the steel is well improved, meanwhile, the thickness of a steel plate meets the use requirement, and a cold-rolled steel plate is effectively replaced. According to themanufacturing method of the steel, the components, the component content and the specific production process of the steel plate are optimally designed, the yield strength and the elongation of the obtained steel plate are guaranteed, and meanwhile, the surface characteristics of the steel plate are improved through secondary pickling, so that the steel plate has high-grade roughness and surface gloss comparable with surface gloss of a cold-rolled plate.

Description

technical field [0001] The invention relates to the technical field of hot-rolled pickled cold-formed steel, and more specifically relates to a DDQ grade hot-rolled pickled cold-formed steel and a manufacturing method thereof. Background technique [0002] At present, the demand for hot-rolled pickling products in household appliances, automobiles and other industries is gradually increasing. With the low cost and high cost performance of pickling sheets, they are gradually favored by major well-known automobile companies, especially for high performance and low cost requirements. Higher and higher related businesses. With the continuous improvement of steel rolling technology, the performance of some hot-rolled pickled sheets can be compared with that of cold-rolled sheets, enabling the "replacing cold with heat" technology to be realized and gradually promoted. [0003] Although the technology of DDQ-grade cold-rolled products has long been mature, it has disadvantages su...

AI Technical Summary

Problems solved by technology

However, the process of this patent is long, and the cold rolling, annealing and smoothing processes have a lot of cost input, which cannot meet the production requirements of low cost, high efficiency and good surface quality

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