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Hot dipping galvanized steel plate with characteristics of excellent stamping property and corrosion resistance

A technology of hot-dip galvanized steel sheet and corrosion resistance, which is applied in the field of automobile body panels and alloyed hot-dip galvanized steel sheet, and can solve problems such as pitting and loss of coating corrosion resistance

Inactive Publication Date: 2015-02-25
朱忠良
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If this happens, the stripped plating particles remain in the die, thus causing a large number of undesired indentations on the surface of the steel sheet
In addition, the corrosion resistance of the coating itself is also lost

Method used

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  • Hot dipping galvanized steel plate with characteristics of excellent stamping property and corrosion resistance
  • Hot dipping galvanized steel plate with characteristics of excellent stamping property and corrosion resistance

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Experimental program
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Embodiment Construction

[0019] The molten steel adjusted to the above composition is washed and cast into billet by continuous casting method. The steel billet is rolled into cold formed steel plate by hot rolling and cold rolling. In hot rolling, the finish rolling temperature needs to be about 850°C-920°C close to the Ar3 transformation point to obtain high processability. It is desirable that the winding temperature is about 600° C. or higher. In addition, in the cold rolling step, it is desirable that the rolling reduction is about 50% or more.

[0020] In hot-dip galvanizing, the surface of the steel sheet is cleaned before annealing and reducing. Degreasing, pickling or burning are all available methods. The steel plate is then annealed and reduced. It is suitable to use an H2 atmosphere containing several percent to several tens percent of N2. It is also desirable that the dew point is 0°C or lower. Although the annealing reduction temperature needs to be higher than the recrystallizatio...

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Abstract

The invention relates to a hot dipping galvanized steel plate with characteristics of excellent stamping property and corrosion resistance. According to the hot dipping galvanized steel plate, the alloying hot dipping galvanized layer is formed on the surface of the ultra-low carbon steel plate, the surface of the plated layer is at least provided with the alloying hot dipping galvanized plating layer of the Fe-Zn-Ni coating layer Al, and the stamping value R of the galvanized steel plate is more than 2.

Description

technical field [0001] The invention relates to an alloyed hot-dip galvanized steel sheet, which has excellent punchability and corrosion resistance, and is used as an outer panel of an automobile. Background technique [0002] Because alloyed hot-dip galvanized steel sheets (hereinafter sometimes referred to as "GA") for automotive body panels are subjected to deep drawing to improve their designed features, they are required to have high toughness (elongation E1) And higher plasticity (Lankford value, r value). In order to solve the problem of obtaining high toughness and high plasticity at the same time, from the perspective of steel plate material properties, a series of methods for reducing the content of C, N, P, S, etc. contained in steel have been developed. Optimal hot and cold rolling processes have also been developed. [0003] Combining the requirements for the steel plate, the characteristic requirement for the coating layer of the GA steel plate is that the c...

Claims

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Application Information

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IPC IPC(8): C23C2/06C22C38/14C22C38/12C22C38/06
CPCC23C2/06C23C2/40C23C28/021
Inventor 朱忠良
Owner 朱忠良