Hot-dip galvanized IF steel plate production method capable of controlling surface waviness

Abstract

The invention relates to a hot-dip galvanized IF steel plate production method capable of controlling surface waviness. The hot-dip galvanized IF steel plate is prepared from the following chemical components in percentage by weight: larger than 0 and less than or equal to 0.0030% of C, larger than 0 and less than or equal to 0.020% of Si, 0.04-0.15% of Mn, larger than 0 and less than or equal to0.010% of P, larger than 0 and less than or equal to 0.012% of S, 0.02-0.045% of Al, larger than 0 and less than or equal to 0.06% of Cr, larger than 0 and less than or equal to 0.005% of Nb, 0.05-0.09% of Ti, larger than 0 and less than or equal to 0.004% of N, larger than 0 and less than or equal to 0.06% of Ni and the balance of Fe and inevitable impurities. The production process of the hot-dip galvanized IF steel plate comprises the steps of smelting, external refining, continuous casting, hot continuous rolling, cold acid continuous rolling, annealing and hot dipping. Through the comprehensive measures of reasonably designing the chemical components of the steel plate, adjusting the process parameters of the hot continuous rolling and annealing process, controlling the surface roughness of a finishing roller and the like, the surface texture of the stamped hot galvanized IF steel plate is finally improved, and the requirements of a 2C1B painting process are met.

Description

technical field [0001] The invention relates to the technical field of IF steel production for automobiles, in particular to a production method of a hot-dip galvanized IF steel plate capable of controlling surface waviness Wsa≤0.35 μm. Background technique [0002] In the automotive painting process, the traditional three-coating and two-baking (3C2B) production line is long, requires large equipment investment, high energy consumption and VOC emissions, and does not meet the national requirements for environmental protection. In recent years, the new two-coating-one-baking (2C1B) process with the goal of high quality, low cost, high efficiency and environmental friendliness has been more and more recognized and adopted by the automotive coating industry. [0003] The 2C1B painting process cancels the steps of intermediate coating and drying after intermediate coating, but the intermediate coating plays an important role in the whole coating process. It has a very obvious ...

AI Technical Summary

Problems solved by technology

In the past, the control of the surface texture of automotive steel sheets started with improving the roughness of the coating, without considering the surface texture of the galvanized steel sheet itself due to uneven deformation

But at present, the surface quality control of the galvanizing process is relatively accurate, because the zinc layer affects the surface texture has been greatly improved

However, in the case of large stamping deformation, galvanized steel sheets still have surface texture problems

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