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Manufacturing method of spray-coated metallized steel pipe

A manufacturing method and technology for metal pipes, which are applied in the direction of metal material coating process, superimposed layer plating, coating, etc., can solve problems such as spalling of sprayed metal layers, corrosion resistance of steel pipes, cracks, etc., and achieve increased design. The effect of freedom, inexpensive equipment investment, and excellent corrosion resistance

Active Publication Date: 2017-06-09
DAIWA STEEL TUBE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, since the bonding force at the steel pipe interface of the sprayed metal layer is weaker than that of the hot-dip coating, in the case of bending, etc., there is a possibility that the sprayed metal layer peels off or cracks, which may cause problems with the corrosion resistance of the steel pipe.
In addition, it is difficult to perform delicate thickness control of the sprayed metal layer, and it is difficult to form a uniform sprayed metal layer

Method used

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  • Manufacturing method of spray-coated metallized steel pipe
  • Manufacturing method of spray-coated metallized steel pipe
  • Manufacturing method of spray-coated metallized steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Aluminum is used as the sprayed metal. A long rolled steel plate with a thickness of 1.2 mm and a width of 59.5 mm is set on figure 1 In the production line shown, the inner surface is shot blasted by the shot blasting device, and then the sprayed metal layer is formed on the inner surface by the thermal spraying device. In addition, after the hot-dip galvanizing device, the aluminum is sprayed by the surface spraying device.

[0077] In the present invention, conditions such as zinc surface temperature (normal temperature to 450° C.), linear velocity (0 to 400 m / min), and spraying angle (0 to 90°) during thermal spraying can be appropriately combined. At the same time, the combination concentration and distribution of aluminum can be adjusted by adjusting the amount of sprayed aluminum.

[0078] Figure 5 A comparison of the appearance of the steel pipe manufactured in Example 1 and the steel pipe manufactured by the hot-dip plating method as a conventional example ...

Embodiment 2

[0083] Aluminum is used as the sprayed metal, and a long rolled steel plate with a thickness of 1.2mm and a width of 59.5mm is installed on the figure 1 In the production line shown, the inner surface is shot blasted by a shot blasting device, and then a sprayed metal layer is formed on the inner surface by a thermal spraying device. In addition, after the hot-dip galvanizing, the aluminum is sprayed by the surface spraying equipment.

[0084] The appearance photograph of the obtained section is shown in Figure 6 (a), the process of measuring the element distribution of its cross-section by EPMA is shown in Figure 6 (b). Such as Figure 6 As shown in (a), in the steel pipe based on the present example, the feature that the sprayed metal is discretely distributed in the form of fine islands in the matrix metal can be seen. It can be seen that the blackened aluminum is finely and discretely distributed in the whitish zinc matrix. Additionally, if Figure 6 As shown in (b...

Embodiment 3

[0086] Aluminum is used as the sprayed metal, and a long rolled steel plate with a thickness of 1.2mm and a width of 59.5mm is installed on the figure 1 In the production line shown, the inner surface is shot blasted by a shot blasting device, and then a sprayed metal layer is formed on the inner surface by a thermal spraying device. In addition, after the hot-dip galvanizing device, the thermal spraying of aluminum is performed by the surface spraying device. In this example, the galvanized surface temperature was about 400°C, and aluminum was sprayed at 15 g / min at a spraying angle of 90° in a low-speed production of about 20 m / min. The contact portion between zinc and sprayed aluminum dissolves, which promotes the combination with aluminum, and the distribution of the surface is an aluminum layer, the middle is a zinc-aluminum layer, and the inner layer is a zinc layer. This structure can also be realized in medium and high-speed production based on a series of correlation...

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Abstract

The invention provides a manufacturing method for a spraying metallic coating steel pipe which is good in productbility and provided with an entire, approximately uniform and good metallic coating. The manufacturing method is as follows: tubular metal plate constituted by a first constituent is formed continuously and is in welded connection with butting end parts to form a metal pipe; after the continuously welded connection, a metallic coating constituted by a second constituent different from the first constituent is directly formed in the peripheral direction and is continuous in length direction through spraying. According to the invention, relative to the spraying metallic coating formed outside, processing steps are particularly supposed to be provided to enable the metallic coating with approximately uniform thickness.

Description

[0001] This application is a divisional application of an invention patent application titled "Manufacturing method of spray-coated metal steel pipe", with an international application date of November 18, 2004, an international application number of PCT / JP2004 / 017202, and a national application number of 200480044438.4 . technical field [0002] The present invention relates to a method of manufacturing a metallized steel pipe having a spray coating process on the inner surface or the outer surface of the steel pipe. Background technique [0003] As a method for producing metal-plated steel pipes, the following method has been known for a long time. This method has a method of continuously forming a steel sheet with a different metal (typically zinc) on both front and back sides of the steel sheet into a tubular shape using roll forming. The process of butt-jointing the end face of the plated steel plate formed into a tubular shape, continuous welding, forming a tube, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00C23C28/02
CPCC23C28/00C23C28/023C23C28/025C23C28/028
Inventor 中村慎市郎玉村忠义
Owner DAIWA STEEL TUBE IND
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