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Bimetal composite pipe and preparation method thereof

A bi-metal composite pipe and outer pipe technology, applied in the field of composite pipes, can solve the problems of wear of the inner wall of the pipe, weak impact resistance, increased processing difficulty, etc., and achieve the effect of prolonging the service life, cost-effective, and avoiding being pulled.

Inactive Publication Date: 2011-12-14
宜昌中南精密钢管有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] In industries such as electric power, mining, and metallurgy, the transportation of materials is usually carried by short-distance, high-pressure pipelines. Due to the fluid movement of the conveyed materials in the pipeline, the pipeline is under considerable pressure and undergoes severe wear and tear. Single material It is difficult for the pipeline to meet the requirements of this working condition
At present, 16Mn seamless steel pipes are commonly used at home and abroad, resulting in serious wear of the inner wall of the pipe and frequent replacement.
However, the replacement of medium and high carbon alloy steel will increase the difficulty of processing, and the impact resistance will be weak.

Method used

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  • Bimetal composite pipe and preparation method thereof
  • Bimetal composite pipe and preparation method thereof

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preparation example Construction

[0025] A method for preparing a bimetal composite pipe, comprising the following steps:

[0026] 1) The outer tube 1 and the inner tube 2 are cold-drawn after surface treatment, and the gap between the inner wall of the outer tube 1 and the outer wall of the inner tube 2 is 2-5 mm;

[0027] 2) Align the inner tube and the outer tube respectively and perform surface treatment, the surface treatment is pickling, cleaning and neutralization, phosphating and saponification;

[0028] 3) The outer tube 1 and the inner tube 2 are combined and cold-drawn, so that the outer tube 1 and the inner tube 2 are tightly combined;

[0029] A bimetal composite pipe is obtained through the above steps.

[0030] In step 3), the amount of wall reduction is controlled to be 6%-24% of the wall thickness during composite cold drawing.

[0031] Optimally, in step 3), the amount of wall reduction is controlled to be 10%-20% of the wall thickness during composite cold drawing.

[0032] For further op...

Embodiment

[0039] 1. The raw material specification is 20#Φ140×4×5200mm. Firstly, the surface treatment (pickling—cleaning and neutralization—phosphating—saponification) is carried out, and then the size specification is Φ135×2.5×8200mm through cold extrusion and cold drawing of the inner and outer molds. The precision tube is used as the outer tube 1.

[0040] 2. The specification of the raw material is 45Mn2Φ127×4×6000 mm. After surface treatment and cold drawing, a precision tube with a size of Φ127×2.5×8200 mm can be used as the inner tube 2 .

[0041] 3. Straighten and surface treat the inner and outer pipes respectively;

[0042] 4. Place the straightened 45Mn2 inner tube in the inner hole of the 20# outer tube and align it. At the same time, after compound cold drawing, the inner tube and the outer tube are combined into one, tightly combined without gaps, and the size after cold drawing and compounding is φ133×4.5 ×8200mm, the length dimension is the size after removing the clam...

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Abstract

A bimetal composite pipe, the outer pipe and the inner pipe are connected by cold drawing. A phosphating layer and / or a saponified phosphating layer is provided between the outer tube and the inner tube. A method for preparing a bimetallic composite pipe, comprising the following steps: 1) cold drawing the outer pipe and the inner pipe respectively after surface treatment, and the gap between the inner wall of the outer pipe and the outer wall of the inner pipe is 2-5 mm; The tube is straightened and surface treated; 3) The outer tube and the inner tube are fitted together and then compositely cold-drawn, so that the outer tube and the inner tube are tightly combined; the bimetallic composite tube is obtained through the above steps. In the present invention, pipes of different materials are combined by cold drawing. Under the premise of ensuring good toughness and impact resistance of the product, the strength and wear resistance have increased by more than 4-5 times compared with the previous single-material 16Mn steel pipe.

Description

technical field [0001] The invention relates to a composite pipe, in particular to a bimetallic composite pipe. Background technique [0002] In industries such as electric power, mining, and metallurgy, the transportation of materials is usually carried by short-distance, high-pressure pipelines. Due to the fluid movement of the conveyed materials in the pipeline, the pipeline is under considerable pressure and undergoes severe wear and tear. Single material It is difficult for the pipeline to meet the requirements of this working condition. At present, 16Mn seamless steel pipes are generally used at home and abroad, resulting in serious wear and tear on the inner wall of the pipe and frequent replacement. The replacement of medium and high carbon alloy steel will increase the difficulty of processing, and the impact resistance is weak. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a bimetal composite pipe, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02B21C37/06B21C1/22
Inventor 赵江华卢凤云
Owner 宜昌中南精密钢管有限公司
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