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Method for controlling coating alloying homogeneity

An alloying and uniform technology, applied in coatings, manufacturing tools, hot dipping processes, etc., can solve the problems of uneven soaking temperature and cooling rate of alloying, insufficient consideration of problems, and no countermeasures to improve, etc. Achieve the effect of improving stability, ensuring uniformity, and uniform coating thickness

Inactive Publication Date: 2009-03-04
BAOSHAN IRON & STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, neither of these two patents has countermeasures to improve the unevenness of the subsequent alloying soaking temperature and cooling rate, and it does not take into account the improvement of the uniformity of the coating thickness, so the effect of uniform alloying of the coating is not obvious
[0006] The above-mentioned prior art improves the uniformity of the alloying degree of the strip steel coating to a certain extent for the uniformity of microscopic surface alloying of the coating and the uniformity of macroscopic heating, but due to incomplete considerations, the uniformity of coating thickness, uniformity No effective measures have been taken for the uniformity of heat and cooling, which ultimately makes the control effect of the uniformity of the coating during the alloying heat treatment unsatisfactory. In addition, in actual production, how to make the strip steel coating thickness and alloy It is still a problem to be solved to achieve the degree of uniformity at the same time.

Method used

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  • Method for controlling coating alloying homogeneity
  • Method for controlling coating alloying homogeneity
  • Method for controlling coating alloying homogeneity

Examples

Experimental program
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Effect test

example 1

[0050] The plan adopted is:

[0051] (1) Optimize the process parameters of the air knife to obtain a coating with a more uniform thickness;

[0052] (2) The touch roll device is used to stabilize the strip.

[0053] A hot-dip galvanizing unit optimizes the process parameters of the air knife, and adopts image 3 In the contact roll device shown, the strip steel 1 is purged by the air knife 8 and stabilized by the touch roll 10, then enters the heating section 11, the soaking section 13 and the cooling section 15 of the alloying furnace for annealing treatment of the coating alloy coating. Table 1 is the combination process parameters of air knife pressure, strip steel speed and air knife distance. Through the combination of parameters in Table 1, and the use of air knife edge baffles and touch rolls, alloyed hot-dip galvanized products with very good coating uniformity can be produced.

example 2

[0055] The plan adopted is:

[0056] (1) Electromagnetic stabilization device is used to stabilize the strip steel;

[0057] (2) In the cooling section of the alloying furnace, adopt Figure 7 Shown is the jet cooling device to obtain uniform cooling for plating alloying.

[0058] Figure 4 It is a schematic diagram of the implementation of stabilizing strip steel with an electromagnetic stabilizing device. After the strip steel 1 is purged by the air knife 8 and stabilized by the electromagnetic stabilizing device 33, it enters the heating section 11, the soaking section 13 and the cooling section 15 of the alloying furnace for coating alloying Coating annealing treatment. At the cooling section 15 of the alloying furnace, the Figure 7 In the air jet cooling device shown, the nozzles on the upper and lower surfaces of the strip steel 1 are divided into five sections, and the gas injection speed of each section is adjustable. Horizontal uniform band temperature. In this...

example 3

[0060] The plan adopted is:

[0061] (1) Use contact rolls to stabilize the strip;

[0062] (2) The air knife edge baffle device is used to obtain a more uniform thickness of the coating;

[0063] (3) The strip edge burner is adopted to make the strip enter the alloying heating furnace at a more uniform transverse temperature;

[0064] (4) In the soaking section, use the device shown in Figure 8 with the heat preservation furnace wall that can be moved horizontally to adjust the thermal insulation performance or heat dissipation performance of the soaking section, so as to achieve uniform soaking of the coating alloying.

[0065] Figure 5 It is a schematic diagram of the touch roll and the edge burner for industrial application. After the strip steel 1 is stabilized by the touch roll 10, before entering the heating section 11 of the alloying furnace, the edge burner 43 is used for flame heating to compensate the heat of the edge of the strip steel. loss. A total of 8 burner...

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Abstract

The invention provides a method for controlling the evenness of cladding alloying, which comprises the following steps: at least a set of strip steel stabilizing device is arranged between an air knife and a top roller and air knife parameters are adjusted, to improve the evenness of the strip steel cladding thickness; the strip steel temperature evenly enters into an alloying heating furnace, evenly heats and / or cools, to improve the evenness of cladding alloying. The method ensures the evenness of the strip steel surface cladding thickness by improving the stability of the strip steel at the air knife; meanwhile, improves the evenness of the strip steel temperature along the width of the strip steel before alloying heating, during the alloying heat evenness process and in the alloying cooling process, so as to evenly alloy the strip steel cladding. An alloyed hot-dip galvanized steel sheet manufactured by the method can ensure the evenness of cladding alloying, and is in particular applicable to automobile internal and external plates as well as household electric appliance external plates.

Description

technical field [0001] The invention relates to a method for controlling the uniformity of the coating, especially the alloying uniformity of the coating. Background technique [0002] With the development of the automobile industry, the outer panels of automobiles, especially the outer panels of cars, have higher and higher requirements on the surface quality of steel plates. The outer panels of cars not only require that the surface of the steel plate must not have any visible defects that affect the use, but also require the surface of the steel plate to be very uniform and coated. After installation, the sharpness of the steel plate is good. [0003] Due to its excellent corrosion resistance, welding performance, coating performance and stone chipping resistance, the proportion of alloyed hot-dip galvanized steel sheets in automotive outer panels is gradually increasing, but compared with electro-galvanized steel sheets, its surface uniformity is still low. There is sti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/40C23C2/26C22F1/00C21D9/56
Inventor 李俊张理扬林秀贞
Owner BAOSHAN IRON & STEEL CO LTD
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