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Method for finishing hot-dip coated steel sheet

A hot-dip galvanized steel sheet and hot-dip plating technology, applied in hot-dip plating process, coating, metal material coating process, etc. Stamping deformation can not be coordinated and other problems

Inactive Publication Date: 2010-12-08
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although hot-dip galvanized steel sheet has excellent corrosion resistance, good heat reflection and appearance decoration, etc., compared with hot-dip galvanized sheet, its coating formability is poor, and the coating is easy to crack during the stamping process of parts
This is mainly because there is a Fe-Al-Si-Zn brittle interphase layer in the coating, which is easy to cause cracks in the brittle interphase layer during the stamping process; in addition, there are differences in the physical properties of the Zn-rich phase and the Al-rich phase in the coating, Stamping deformation cannot be coordinated, so cracks are prone to occur at the interface of the two phases; in addition, Si precipitates are prone to appear in the hot-dip galvanized layer, resulting in uneven coating

Method used

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  • Method for finishing hot-dip coated steel sheet
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  • Method for finishing hot-dip coated steel sheet

Examples

Experimental program
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Embodiment 1

[0024] This embodiment is used to illustrate the method for skin-passing a hot-dip coated steel sheet provided by the present invention.

[0025] Use skin pass rolls with a thickness of 0.8mm and a coating surface density of 180g / m 2 Low-carbon aluminum-killed steel hot-dip galvanized sheet DX52D+Z (coating is Zn 98% by weight-Al 2% by weight) is rolled, and the condition of rolling includes rolling force F R It is 220KN, the tension is 90KN, the elongation of the skinning is 0.62%, and the surface roughness of the skinning roll is Ra 0 , The surface roughness Ra of the hot dipped steel plate before skin pass 1 The difference between the roughness of the brighter part of the spangle and the roughness of the darker part of the spangle before lightening ΔRa 1 They are shown in Table 1 respectively. Surface roughness Ra of hot dipped steel plate after skin pass 2 and the difference ΔRa between the roughness of the brighter part and the roughness of the darker part of the span...

Embodiment 2-4

[0027] The following examples are used to illustrate the method for skin-passing hot-dip coated steel sheets provided by the present invention.

[0028] According to the method of Example 1, the low-carbon aluminum-killed steel hot-dip galvanized sheet DX52D+Z was rolled (that is, skin-passed). The difference is that the rolling conditions are shown in Table 1. Surface roughness Ra of hot dipped steel plate after skin pass 2 and the difference ΔRa between the roughness of the brighter part and the roughness of the darker part of the spangle after skin pass 2 They are shown in Table 1 respectively.

Embodiment 5-8

[0032] The following examples are used to illustrate the method for skin-passing hot-dip coated steel sheets provided by the present invention.

[0033] According to the method of embodiment 1, the steel plate thickness is 1.2mm, and the coating surface density is 120g / m 2 The low-carbon aluminum-killed steel hot-dip galvanized sheet DX52D+AZ (the coating is Al 55% by weight-Si1.6% by weight-43.4% by weight) is rolled (that is, skin-passed), and the difference is that the rolling conditions are adopted As shown in Table 1, the appearance of the low-carbon aluminum-killed steel hot-dip galvanized sheet before finishing is as follows: figure 1 shown. Surface roughness Ra of hot dipped steel plate after skin pass 2 and the difference ΔRa between the roughness of the brighter part and the roughness of the darker part of the spangle after skin pass 2 They are shown in Table 1 respectively.

[0034] in, image 3 It is a photograph of the skin-finished hot-dip galvalume steel sh...

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Abstract

The invention relates to a method for finishing a hot-dip coated steel sheet, comprising the step of rolling a hot-dip coated steel sheet by using a finishing roller, wherein the surface roughness of the finishing roller Ra is less than or equal to 1 Mum. The method is especially suitable for hot galvanized steel sheets and hot galvanized and aluminized steel sheets with zinc spangles on the coated surface. The method can ensure good shape, surface quality and coating performance of the hot-dip coated steel sheet and can ensure that zinc spangle profiles on the coating surface are clear and maintain good appearance decoration performance. In addition, the method is also suitable for finishing hot galvanized and aluminized steel sheets and facilitates the application of the hot galvanized and aluminized steel sheets to the electric appliance manufacturing industry and other industries having higher requirements for shape, surface quality and coating performance of the hot galvanized and aluminized steel sheets.

Description

technical field [0001] The invention relates to a method for smoothing hot-dip coated steel sheets. Background technique [0002] Hot-dip galvanized steel sheets and hot-dip galvanized steel sheets are the most widely used hot-dip coated steel sheets at home and abroad. Its production process is: cold-rolled coil → uncoiling → degreasing cleaning → continuous annealing → hot-dip plating → cooling after plating. like figure 1 As shown, after the hot-dip galvanized steel sheet and the hot-dip galvanized steel sheet are hot-dipped, a coating with a certain thickness is formed on the surface of the steel sheet and spangles with an appearance and decorative effect are formed on the surface of the coating. [0003] Hot-dip galvanized steel sheets are widely used, not only in household appliances and automobile manufacturing industries that require high stamping performance, surface quality, plate shape and coating performance, but also in buildings that require high decorative a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B1/22B21B27/02C23C2/26C23C2/06C23C2/12C23C2/40
Inventor 郭太雄许哲峰于丹周一林徐权刘春富郑之旺金永清杨金成王平利
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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