Hot-rolled steel sheet with small variation in material and thickness and excellent plating peeling resistance, and manufacturing method thereof

Abstract

The present invention relates to a hot rolled steel plate which has low errors in material and thickness and has excellent resistance of electroplating stripping and the manufacturing method thereof. The present invention provides the hot rolled steel plate including the C, Mn, Si, Al, P, S, Cu, Sb, B, N, Ti, Nb foreign element Cr, Ni, Mo, Sn, remainder of Fe and other inevitable impurities, the contents thereof are described in the instruction. The present invention also provides the manufacturing method of the hot rolled steel plate. According to the present invention, scrap iron can be used for making the hot rolled steel plate to improve the reusing resources and to save the energy and productivity, the hot rolled steel plate fused and galvanized can be also used for a molten zinc hot rolled steel plate.

Description

technical field [0001] The present invention relates to a hot-rolled steel sheet having a small variation in material and thickness and excellent plating peeling resistance, and a method for producing the same. Background technique [0002] A steel plate that is used as a structural member in the structural parts of an automobile body absorbs the shock from the exterior of the automobile in a collision to the maximum and supports the body firmly to ensure the safety of passengers. Considering fuel consumption efficiency and increased fuel consumption, the development and research direction of automobile steel sheets is how to make steel sheets have the required functionality to increase the strength to reduce the overall weight of the car and to impart various characteristics according to the parts of the car. In addition, the existing hot-rolled pickled steel sheets used as materials for the chassis (chassis) of automobile structures tend to be thinner in order to achieve v...

AI Technical Summary

Problems solved by technology

In addition, the technology has the disadvantage that it is difficult to ensure excellent yield strength because the solid solution strengthening steel limits the content of Mn to a relatively low content of 0.1-0.8%

However, there is a disadvantage that when a large amount of Cu is added as described above, cracks may occur during continuous casting. To prevent this phenomenon, it is necessary to add expensive Ni or further add a large amount of Si and Mn elements.

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