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Manufacturing method of hot dip galvanizing steel plate

A technology of hot-dip galvanized steel sheet and manufacturing method, applied in hot-dip galvanizing process, coating, metal material coating process, etc. The effect of reduced peeling and other phenomena, low cost, and optimized grain orientation of the coating

Inactive Publication Date: 2010-02-24
PANGANG GROUP RESEARCH INSTITUTE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this is a technology about retained austenitic steel, and there is a problem that sufficient performance is not necessarily obtained for high-strength steel sheets without retained austenitic phase
[0004] To sum up, in the prior art, the adhesion between the coating and the steel base is improved by changing the composition of the steel sheet or by controlling the surface roughness of the hot-dip galvanized steel sheet to form a film on the surface, but no good effect has been achieved. There is no method to improve the adhesion of the coating to the steel substrate by controlling the structure of the coating

Method used

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  • Manufacturing method of hot dip galvanizing steel plate
  • Manufacturing method of hot dip galvanizing steel plate
  • Manufacturing method of hot dip galvanizing steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1 Preparation of hot-dip galvanized steel sheet experimental examples 1-10 and comparative examples 11-20

[0019] The thickness is 0.8mm, the composition is C: 0.03~0.07%, Mn: 0.01~0.03%, Si: 0.19~0.30%, P: 0.006~0.019%, S: 0.009~0.020%, Al: 0.02~0.07%, The rest of the DX51D cold-rolled steel sheets containing Fe and impurities are pickled and annealed, and then hot-dip galvanized under the hot-dip galvanizing process conditions listed in Table 1. The temperature of the galvanizing bath in the zinc pot is 450 ° C, and the Fe content 2 Left and right, the surface of the zinc layer passes through SiO 2 passivation treatment. The following methods are used to evaluate the coating adhesion properties such as the grain orientation of the coating and the anti-shedding performance, scratch resistance, and wear resistance of the coating.

[0020] Table 1 Hot-dip galvanizing process conditions

[0021]

Embodiment 2

[0022] Embodiment 2 Performance measurement of hot-dip galvanized steel sheet experimental examples 1-10 and comparative examples 11-20

[0023] (1) Coating grain orientation

[0024] The surface of the coating was not treated in any way, and the small-angle diffraction (grazing angle 5°) of the coating was respectively carried out on the X-ray diffractometer (XRD) to measure the diffraction peak intensity of the coating. Typical diffraction patterns of experimental examples 1 and 6 and comparative examples 11 and 15 coating surface at 5 ° grazing angle are shown in Fig. 1. It can be seen that the intensity of the strongest diffraction peak Zn(002) of Zn in the coatings of Experimental Examples 1 and 6 is much higher than that of Comparative Examples 11 and 15, and the strong peak of Zn is transferred from Zn(101) to Zn(002). Table 2 has listed the diffraction intensity of each sample Zn(002) peak, and it can be seen that compared with the comparative example that the cooling...

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Abstract

The invention pertains to the field of hot-dip galvanized steel sheet manufacturing; the technical problem to be solved is to provide a production method of the hot-dip galvanized steel sheet, which is that through controlling the cooling speed of the steel sheet taking out of a zinc pot, the optimum grain orientation of a plating layer is adjusted so as to enhance the adhesive quality of the plating layer. The method specifically comprises the steps that the steel plate is pickled and annealed, and hot-dip galvanizing operation is carried out; during the operation, the temperature of startingto plate is 455 to 465 DEG C; the plating temperature in the zinc pot is 450 to 460 DEG C; Fe content in plating bath is less than 0.03 percent; Al content in plating bath is 0.16 to 0.18 percent; the speed of steel sheet conveyer unit is 110 to 120m / min; then air cooling is carried out to make compulsory cooling after steel sheet sent out of zinc pot with a cooling speed 70 to 90 percent. By adopting the technical conditions, the crystal grain Zn (002) with optimized orientation is formed between the steel sheet and the zinc plating layer, thus causing the performance of attachment, scratchresistance, wear resistance to be greatly improved.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanized steel sheet manufacturing, and in particular relates to a method for manufacturing a hot-dip galvanized steel sheet with good coating adhesion. Background technique [0002] Due to its good corrosion resistance, excellent coating performance and clean appearance, hot-dip galvanized steel sheets have been widely used in manufacturing industries such as household appliances and automobile body panels. The requirements for the hot-dip galvanized steel coating are strong adhesion between the coating and the substrate, and it will not fall off when stamping and deformation. In addition, it must have good welding performance, corrosion resistance and phosphating performance to ensure the adhesion of the paint film and after painting. corrosion resistance. However, there are problems such as powdering and peeling of the coating during the stamping process of the hot-dip galvanized steel sheet, which ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/40C22C38/06
Inventor 李炜徐权郭太雄程兴德田冰郑之旺杨学高于丹周一林
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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