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On-line rust-proof method for twisted steel

A technology of threaded steel bar and water vapor, applied in the direction of metal material coating process, coating, solid diffusion coating, etc., can solve the problem of easy rust on the surface of threaded steel bar, and achieve continuous production, good surface gloss, and increased production. cost effect

Inactive Publication Date: 2012-03-28
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem in the prior art that the surface of threaded steel bars treated by waste heat is easy to rust, the present invention provides an online rust prevention method for threaded steel bars. The rebar is sprayed with water vapor or a mixture of water vapor and oxygen to form a protective layer on the surface of the rebar

Method used

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  • On-line rust-proof method for twisted steel
  • On-line rust-proof method for twisted steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Taking the threaded steel bar with a diameter of 32mm after waste heat treatment as an example, the rolled steel bar enters the step-by-step cooling bed at a speed of 7.2m / s. The temperature of the upper cooling bed is 620°C. Spray while walking, the spray time is 2 minutes, then cool naturally. The treated steel bar was sampled and compared with the untreated steel bar for anti-corrosion performance. The sample was placed in the open air and sprayed with rainwater twice a day. The untreated steel bar began to rust within 1 day, and the treated steel bar began to rust after 9 days. point, the anti-corrosion ability is obviously improved.

Embodiment 2

[0026] Taking the threaded steel bar with a diameter of 28mm after waste heat treatment as an example, the rolled steel bar enters the step-by-step cooling bed at a speed of 9.3m / s. The temperature of the upper cooling bed is 580°C. Spray while walking, and the spray time is 3.5 minutes, after which it cools down naturally. The treated steel bar was sampled and compared with the untreated steel bar for anti-corrosion performance. The sample was placed in the open air and sprayed with rainwater twice a day. The untreated steel bar began to rust within 1 day, and the treated steel bar began to rust after 10 days. point, the anti-corrosion ability is obviously improved.

Embodiment 3

[0028] Taking the threaded steel bar with a diameter of 40mm after waste heat treatment as an example, the rolled steel bar enters the step-by-step cooling bed at a speed of 3.5m / s. The temperature of the upper cooling bed is 650°C. Spray while walking, and the spray time is 3 minutes, after which it cools down naturally. The treated steel bar was sampled and compared with the untreated steel bar for anti-corrosion performance. The sample was placed in the open air and sprayed with rainwater twice a day. The untreated steel bar began to rust within 1 day, and the treated steel bar began to rust after 7 days. point, the anti-corrosion ability is obviously improved.

[0029] figure 1 The number 1 in shows the untreated rebar, figure 1 The symbol 2 in represents the threaded steel bar treated by the method of Embodiment 1 of the present invention. from figure 1 It can be seen from the figure that the surface gloss of the threaded steel bars treated by the anti-rust method of ...

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Abstract

The invention discloses an on-line rust-proof method for twisted steel. The method comprises the following step: ejecting steam or mixture of steam and oxygen to the twisted steel subjected to waste heat processing so as to generate a protective layer on the surface of the twisted steel. According to the on-line rust-proof method for twisted steel, the twisted steel with good surface gloss can be obtained. In addition, the method can satisfy the continuous production requirement of the twisted steel, and the production cost can not be obviously increased.

Description

technical field [0001] The invention relates to the field of steel anticorrosion, and more specifically, the invention relates to an online antirust method for threaded steel bars. Background technique [0002] The threaded steel bars produced by the waste heat treatment process rust quickly on the surface. Generally, the steel bars will be obviously corroded after being placed in the open for 3-5 days, especially affected by the weather and storage environment, and the air humidity is high. Corrosion will occur in 1 day or even a few hours, resulting in a decline in the appearance quality of the steel bar. The extremely poor surface condition of steel bars seriously affects the sales of products and the use of users. There has been no good way to improve the surface corrosion of waste heat treated steel bars. Although there are many reports on research results in China, there are few that can meet the online application and have good results. Those that have been successfu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/16C23C8/12
Inventor 杜传治梁辉
Owner LAIWU IRON & STEEL GRP
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