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Seamless steel pipe for long pipe trailer and manufacturing method for seamless steel pipe

A technology of seamless steel pipes and manufacturing methods, applied in the direction of manufacturing tools, slender elements, building elements, etc., can solve the problems of reduced production efficiency, not smooth enough, metal loss, etc., and achieve high quality and pass rate of finished products, transportation High efficiency and low metal consumption

Inactive Publication Date: 2012-10-10
DEYANG YUXIN MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after thermal expansion, the unevenness of the wall thickness of the same section of the steel pipe will increase to more than 30%, so that the inner hole of the steel pipe will be strained or even broken during cold drawing; pickling is mainly to remove the oxide scale on the surface of the waste pipe , grease, rust, decarburization layer produced during hot rolling, etc. After the waste pipe is thermally expanded, graphite remains in the inner hole of the steel pipe, resulting in long pickling time, sometimes even hydrogen embrittlement, and the inner hole is not cleaned cleanly. What's more serious is that the graphite adhered to the inner surface of the steel pipe sometimes makes the pickling solution quickly turn into a paste, which leads to the scrapping of the steel pipe and the low pass rate of finished products, which also increases the difficulty and cost of environmental protection treatment of the pickling solution
[0005] The surface quality of the seamless steel pipe produced by method 2 is poor, and the surface has bamboo leaf-like unevenness, which is not smooth enough, and the wall thickness difference of the same section is large
In order to eliminate the surface defects of the seamless steel pipe, it is necessary to increase the inner and outer surface grinding process of the waste pipe. The inner and outer surface grinding process not only reduces the production efficiency, but also has more than 10% metal loss, resulting in material waste
In addition, pickling treatment is also involved, which increases the difficulty and cost of environmental protection treatment of pickling liquid

Method used

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  • Seamless steel pipe for long pipe trailer and manufacturing method for seamless steel pipe

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The outer diameter of the seamless steel pipe is 720mm, the wall thickness is 27mm, and the length is 11000mm.

[0039] The manufacturing method of the above-mentioned seamless steel pipe includes the following sequential steps:

[0040] 1). Select waste pipes with a diameter of 728mm, a wall thickness of 30mm, and a length of 10540mm, and re-inspect the selected waste pipes; make chucks for the re-inspected waste pipes;

[0041] 2). Use an external shot blasting machine to perform shot blasting on the outer surface of the waste pipe. The projectiles of the external shot blasting machine are composed of steel shot and steel sand in a ratio of 6:4. The diameter of these projectiles is 1.2mm. The speed of the shot treatment is 1.2m / min; the inner surface of the waste pipe is shot peened by an internal shot blasting machine. The projectiles of the internal shot blasting machine are composed of steel shot and steel sand in a ratio of 8:2. 1.2mm, the speed of shot peening t...

Embodiment 2

[0050] The outer diameter of the seamless steel pipe is 660mm, the wall thickness is 19mm, and the length is 12000mm.

[0051] The manufacturing method of the above-mentioned seamless steel pipe includes the following sequential steps:

[0052] 1). Select waste tubes with a diameter of 660mm, a wall thickness of 22mm, and a length of 11000mm, and re-inspect the selected waste tubes; make chucks for the re-inspected waste tubes;

[0053] 2). Use an external shot blasting machine to perform shot blasting on the outer surface of the waste pipe. The projectiles of the external shot blasting machine are composed of steel shot and steel sand in a ratio of 5:3. The diameter of these projectiles is 1.1mm. The speed of the shot treatment is 1.0m / min; the inner surface of the waste pipe is shot peened by an internal shot blasting machine. The projectiles of the internal shot blasting machine are composed of steel shot and steel sand in a ratio of 7:1. 1.1mm, the speed of shot peening t...

Embodiment 3

[0062] The outer diameter of the seamless steel pipe is 630mm, the wall thickness is 21.5mm, and the length is 12500mm.

[0063] The manufacturing method of the above-mentioned seamless steel pipe includes the following sequential steps:

[0064] 1). Select waste tubes with a diameter of 630mm, a wall thickness of 25mm, and a length of 11400mm, and re-inspect the selected waste tubes; make chucks for the re-inspected waste tubes;

[0065] 2). Use an external shot blasting machine to perform shot blasting on the outer surface of the waste pipe. The projectiles of the external shot blasting machine are composed of steel shot and steel sand in a ratio of 7:5. The diameter of these projectiles is 1.3mm. The speed of the shot treatment is 0.9m / min; the inner surface of the waste pipe is shot peened by an internal shot blasting machine. The projectiles of the internal shot blasting machine are composed of steel shot and steel sand in a ratio of 8:2. 1.0mm, the speed of shot peening...

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Abstract

The invention discloses a seamless steel pipe for a long pipe trailer and a manufacturing method for the seamless steel pipe. The outer diameter of the seamless steel pipe is 630 to 720mm, the wall thickness is 18 to 30mm, and the length is 10,000 to 12,500mm. The manufacturing method comprises the following steps of: 1) rechecking a pipe blank, and turning a chuck; 2) performing shot blasting treatment on the pipe blank by using an outer shot blasting machine and an inner shot blasting machine respectively; 3) performing surface quality inspection, and polishing; 4) washing the pipe blank, and performing phosphate treatment; 5) saponifying the pipe blank for a first time; 6) performing cold drawing on the pipe blank for a first time; 7) polishing the inner and outer surfaces of a cold drawing pipe, and saponifying the cold drawing pipe for a second time; 8) performing cold drawing on the cold drawing pipe for a second time; and 9) performing dimensional inspection, alignment, defect polishing, surface quality inspection and non-destructive inspection on the cold drawing pipe respectively to form a finished seamless steel pipe, and cropping the top. The seamless steel pipe and the manufacturing method have the characteristics that the seamless steel pipe and the manufacturing method are economical, environment-friendly, low in metal consumption, high in quality and yield of finished products, efficient in processing, easy to operate, and the like, and completely meet the market requirement of seamless steel pipes for long pipe trailers.

Description

technical field [0001] The present invention relates to a seamless steel cylinder for a long-tube trailer, specifically a seamless steel tube for manufacturing the seamless steel cylinder, more specifically, a seamless steel tube for a long-tube trailer, and a method for manufacturing the seamless steel tube. Background technique [0002] The long-tube trailer is mainly composed of five parts: semi-trailer, frame, seamless steel cylinder, front-end safety warehouse, and rear-end operation warehouse. It is a special vehicle for storing and transporting CNG. It has the advantages of large storage capacity, high transportation efficiency, and convenient transportation. The maximum diameter of seamless steel cylinders commonly used in the market is φ559mm, and the frame of each semi-trailer is usually equipped with 6 to 12 φ559mm steel cylinders, and the maximum volume of each steel cylinder is 2.7 M 3 , in this case, the amount of CNG stored in each long-tube trailer is 16.2-32...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16S3/00B23P15/00B21C1/16B24C1/00B24C11/00
Inventor 任启益严太宝
Owner DEYANG YUXIN MACHINERY MFG
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