Hot-rolled pickled plate used for hydroformed steel pipe, and manufacturing method thereof

Abstract

The invention provides a hot-rolled pickled plate used for hydroformed steel pipe, and a manufacturing method thereof. The hot-rolled pickled plate comprises, by weight, 0.05 to 0.2% of C, 0.1 to 1.0% of Si, 0.5 to 1.5% of Mn, 0.001 to 0.02% of Sn, P<=0.015%, S<=0.015%, and the balance Fe and inevitable impurities; and in addition, one or more elements selected from 0.005 to 0.1% of Ti, 0.005 to 0.1% of Nb, and 0.001 to 0.1% of V can be added. According to the manufacturing method, heating temperature is controlled to be 1100 to 1200 DEG C; rough rolling finished rolling temperature is controlled to be higher than 1020 DEG C; precision rolling initial rolling temperature is lower than 1000 DEG C; the temperature of a precision rolling outlet is controlled to be 850 to 910 DEG C by spraying water onto machine frames; laminar cooling is carried out as soon as rolling is finished, and cooling speed is controlled to be 14 to 30 DEG C / s; curl temperature is controlled to be 530 to 600 DEG C; stacking slow-cooling is adopted, and slow cooling speed is controlled to be 0.01 to 0.08 DEG C / s. The obtained hot-rolled pickled plate is pure in steel, and low in alloy amount; strength is high, forming performance is excellent; hydroforming requirements can be satisfied; steel pipe subsequent heating and reducing rolling processes are reduced; cost is low; performance is stable; economic benefit is high; and the hot-rolled pickled plate possesses excellent forming performance and hydraulic expanding performance.

Description

technical field [0001] The invention belongs to the technical field of iron and steel products, in particular to the manufacture of automobile structural parts. Background technique [0002] In some structural parts of automobiles, the hydroforming process can reduce production costs and improve production efficiency. Therefore, the process is gradually expanding in the production and application of auto parts. To produce parts by hydroforming process, the steel plate must have good formability, weldability and high strength. Ordinary carbon steel plate is molded, welded and pipe-made, the strength of the steel plate is increased, and the elongation is significantly lower. When performing hydroforming, the hydraulic expansion rate is low, the forming performance is poor, and rupture occurs when the forming requirements are not met. The steel plate of the invention meets the requirements of hydroformability, has good formability, and still has high elongation after being m...

AI Technical Summary

Problems solved by technology

The production process is long, the process is complicated, the energy consumption is large, and the production cost is high

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