Low-cost ultra-wide automobile shell plate and preparation method thereof

Abstract

The invention relates to a low-cost ultra-wide automobile shell plate and a preparation method thereof. The chemical component of the steel plate is controlled to be prepared from, by weight, smallerthan or equal to 0.0020% of C, smaller than or equal to 0.03% of Si, 0.08-0.16% of Mn, smaller than or equal to 0.01% of P, smaller than or equal to 0.01% of S, smaller than or equal to 0.003% of N, 0.04-0.06% of Ti, 0.003-0.007% of Nb, 0.02-0.05% of Als, and the balance other trace elements. Compared with a traditional technological method for preparing an ultra-wide cold rolling plate, the method has the advantages that the cost is low, the defect is well controlled, the forming property of strip steel is guaranteed, the rate of finished products is high, close to that of the common cold rolling plate, and in addition, the economical benefit and social benefit are brought to the enterprise.

Description

technical field [0001] The invention relates to the field of steel production and manufacturing, in particular to a low-cost ultra-wide automobile outer panel and a preparation method thereof. Background technique [0002] The ultra-wide and ultra-deep drawing grade cold-rolled automobile outer plate is an industrial steel product, and its plate width ranges from 2000mm to 2135mm. It is mainly used in the outer covering parts of automobiles, such as the front and rear and overall side walls, top covers and other parts of automobiles. The high-grade ultra-wide products not only meet the deep drawing requirements of the overall large panel of the car, but also can greatly reduce the production cost compared with the laser welded blank, which is an ideal material for the outer panel of the car. However, the stamping difficulty and surface quality requirements are extremely high, and the shape control is a technical difficulty for the cold rolling process, and the raw material ...

AI Technical Summary

Problems solved by technology

In the high-temperature annealing state in the continuous annealing furnace, it is very easy to cause cold buckling defects caused by uneven heating of the strip steel in the furnace due to the unreasonable interaction between the plate shape and the process system, and in serious cases, it is very easy to cause strip breakage in the furnace Production accidents that lead to production stoppage

[0003] For the automotive outer panel with a width of more than 2000mm, due to its large aspect ratio, low strength and low thermal deformation resistance, it brings great difficulty to the control of the whole process process

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