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Ultra-thick coating production method

A production method and thick coating technology, applied in coating, hot-dip coating, metal material coating, etc., can solve the problems of uneven coating thickness, curling and warping, friction black spots, etc., so as to reduce production costs , The effect of improving the running speed and improving the yield

Inactive Publication Date: 2018-09-28
HUANGSHI SUNNY SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example: the edge thickness difference of conventional coatings is generally 3% to 5%; while thick coating products, the edge thickness difference is as high as 10% to 15%, and the width of the thick edge range is about 50mm on one side, which may lead to coiling in severe cases. unable to produce
[0005] 2. Defects of zinc waves on the surface of the coating
That is, when the zinc liquid flows on the surface of the steel plate, because the coating is too thick, and the viscosity of the zinc liquid is not enough to overcome the weight of the coating, the zinc liquid is formed by dripping, which makes the thickness of the coating uneven and affects the performance of the product.
[0007] 3. Surface spangle uneven defect
In severe cases, during the transportation and storage process after coiling, the protruding parts will rub against each other, resulting in friction black spots, which will affect the corrosion resistance effect of subsequent use

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] This embodiment provides a method for producing an ultra-thick coating. This ultra-thick coating production method adopts the improved Sendzimir method, that is, the annealing furnace is divided into two parts: an open flame non-oxidation heating furnace section and a radiant tube reduction furnace section. The oxidation heating furnace section is heated by an open flame heating method. By adopting an advanced combustion control method and setting the air-fuel ratio reasonably, the best match of rapid non-oxidation heating and energy saving and consumption reduction is achieved.

[0040] The strip steel after passing through the open flame heating furnace section enters the reduction furnace section, and the reduction furnace section is indirectly heated by a radiant tube in a reducing atmosphere furnace filled with nitrogen and hydrogen protective gas. In the reduction furnace section, the micro-oxidized film on the surface of the steel strip is reduced while it is anne...

Embodiment 2

[0069] This embodiment provides a method for producing an ultra-thick coating. The difference between this ultra-thick coating production method and Example 1 is that the air knife parameters in the ultra-thick coating production method provided by this embodiment are used to produce 350g / m2 of strip steel.

[0070] In the present embodiment, when the steel strip whose target zinc layer is 350g / m is produced, the specifications of the steel strip and the height of the air knife from the zinc surface, the distance of the knife lip, the gap between the knife gaps and the wind pressure of the air knife are as follows:

[0071] Table 3 When the target zinc layer is 350g / m2, the comparison table of air knife parameters for producing strip steel with different thickness specifications

[0072]

[0073] In the above table, the knife gap is the gap in the middle of the knife gap, and the gap at the edge of the knife gap is 0.5mm larger than the knife gap.

[0074] Through the abov...

Embodiment 3

[0076] This embodiment provides an ultra-thick coating production method. The difference between this ultra-thick coating production method and Example 1 is that the air knife parameters in the ultra-thick coating production method provided by this embodiment are used to produce 450g / m2 of strip steel.

[0077] In a kind of embodiment of the present invention, when producing target zinc layer to be 450g / m When strip steel, the specification of strip steel and air knife distance from zinc surface height, knife lip distance, knife slit clearance, the relation of air knife wind pressure is as follows :

[0078] Table 4 When the target zinc layer is 450g / m2, the comparison table of air knife parameters for producing strip steel with different thickness specifications

[0079]

[0080]

[0081] In the above table, the knife gap is the gap in the middle of the knife gap, and the gap at the edge of the knife gap is 0.5mm larger than the knife gap.

[0082] Through the above s...

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Abstract

The invention provides an ultra-thick coating production method, and belongs to the field of production of band steel hot galvanizing products. The core thought of the ultra-thick coating production method is that an improved sendzimir method is adopted, and stable production of ultra-thick coating products is achieved by comprehensively using the measures of improving the TV value of a unit, increasing the running speed of the unit, controlling the temperature of a galvanizing technology, adjusting the components of zinc liquid, adjusting the parameters of an air knife, combining an air knifeedge baffle and an edge burner nozzle, and the like. According to specific parameters of the ultra-thick coating production method, the running speed of the continuous hot galvanizing unit is greaterthan 40 mpm; when band steel enters a zinc pot, the temperature of the band steel is controlled to be 370-440 DEG C, and the temperature of the zinc pot is controlled to be 457-463 DEG C; in the galvanizing process, the height form the air knife to the zinc liquid level is 400-760 mm; the distance from the air knife to the band steel is 120-175 mm; the gap of knife seams of the air knife is 1.0-1.3 mm in the middle and 1.5-1.8 mm in the edge; and the air pressure of the air knife is 20-45 Kpa. Through the above setting, the passing rate of the ultra-thick coating products can be increased from 88% to 95%, and thus stable production of the ultra-thick coating products is achieved.

Description

technical field [0001] The invention relates to the field of production of hot-dip galvanized strip steel products, in particular to an ultra-thick coating production method. Background technique [0002] Strip steel hot-dip galvanized ultra-thick coating products belong to the super-conventional products in the continuous hot-dip galvanizing series products. Although the products that the domestic production process can provide can meet the requirements in terms of the total thickness of the coating, the uniformity of the coating thickness and the thickness of the coating The consistency of appearance and the uniformity of spangles have serious defects, which cannot meet the requirements of actual use. Therefore, as of now, the process and technology used to produce ultra-thick coating products that meet the requirements of general use are still blank, and the process technology is very difficult, mainly in the following three aspects: [0003] 1. Thick edge defect of coat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/20C23C2/06C22C18/04
Inventor 汪军民鄢情操
Owner HUANGSHI SUNNY SCI & TECH CO LTD
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