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Production method for galvanized steel plates

A technology of galvanized steel sheet and production method, which is applied in the field of steel rolling, can solve problems such as difficult to control surface waviness, and achieve the effect of stable solidification and adhesion

Inactive Publication Date: 2018-10-12
SHOUGANG CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The embodiment of the present invention solves the technical problem in the prior art that it is difficult to control the waviness of the deformed surface on the premise of ensuring the paint film adhesion of the galvanized steel sheet by providing a production method of the galvanized steel sheet

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  • Production method for galvanized steel plates

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specific Embodiment

[0020] In a specific embodiment provided by the present invention, the method further includes: controlling the size of spangles on the surface of the galvanized steel sheet to be less than 300 μm. Preferably, the size of spangles on the surface of the galvanized steel sheet is controlled to be less than 100 μm.

[0021] The size of the concavo-convex topography caused by grain growth competition is small, but it may also reach more than 500 microns. The spangle size is controlled below 300 microns to suppress the increase of waviness caused by grain growth competition. Preferably it should be controlled below 100 microns, the effect is better.

[0022] In a specific embodiment provided by the present invention, the method further includes: controlling the distance between zinc flow lines on the surface of the galvanized steel sheet to be less than 500 μm. Preferably, the distance between zinc flow lines on the surface of the galvanized steel sheet is controlled to be less t...

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Abstract

The invention relates to the technical field of steel rolling, in particular to a production method for galvanized steel plates. The production method comprises the steps that hot-rolling steel platesor cold-rolling steel plates continuously pass through molten zinc; the hot-rolling steels plates or the cold-rolling steel plates are cooled to obtain the galvanized steel plates of which the surfaces are provided with galvanized layers; the galvanized steel plates are smoothed; the surface roughness Ra of the galvanized steel plates is controlled between 0.6 mu m-1.6 mu m; the surface wavinessWsa1-5 parameter after the dual tensile deformation reaches 5% is smaller than 0.35 mu m. By adopting the production method for galvanized steel plates provided by the invention, stable condensation and adherence requirement of a paint film on the surface of the galvanized steel plates can be met on the premise that the surface roughness Ra of the galvanized steel plates is in a reasonable range;and besides, the surface waviness Wsa1-5 is in a low range after deformation, so that the surface of the paint film has a mirror surface effect after condensation.

Description

technical field [0001] The invention relates to the technical field of steel rolling, in particular to a production method of galvanized steel sheets. Background technique [0002] Galvanized steel sheets are usually used to produce automobile bodies. Automobile bodies have high requirements for painting quality, and the microscopic unevenness of the steel sheet surface has a great influence on its painting performance. In the subsequent painting process of automobiles, one of the important indicators is to obtain good paint film quality. In order to obtain good paint film quality, on the one hand, the surface of the galvanized steel sheet needs to have a certain surface roughness in order to meet the stable solidification and adhesion requirements of the paint film on the surface of the galvanized steel sheet; on the other hand, the surface of the galvanized steel sheet must be controlled Low waviness ensures that the surface of the paint film is mirror-like after solidifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/40C23C2/26
CPCC23C2/06C23C2/26C23C2/40
Inventor 蒋光锐李研王勇围张浩任新意左智宏马兵智滕华湘
Owner SHOUGANG CORPORATION
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