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Compound pipe manufacturing technology for metallurgically bonding anti-corrosion special alloy lining with pipeline steel outer sleeve

A metallurgical bonding and composite pipe technology, which is applied in the field of liquid or gas conveying high-strength corrosion-resistant composite pipes and composite pipe preparation technology, can solve the problems of low interface bonding force, poor comprehensive mechanical properties, and complicated processing, and achieves improved bonding ability, Excellent mechanical properties, reduced wall thickness and weight

Inactive Publication Date: 2014-05-14
张皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In response to the urgent demand for composite pipes for oil and gas drilling, the purpose of the present invention is to provide a composite pipe preparation process in which a special alloy lining and a pipeline steel jacket are metallurgically combined to solve the problems of poor comprehensive mechanical properties, low interface bonding force and processing problems in composite pipes. complicated question

Method used

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  • Compound pipe manufacturing technology for metallurgically bonding anti-corrosion special alloy lining with pipeline steel outer sleeve
  • Compound pipe manufacturing technology for metallurgically bonding anti-corrosion special alloy lining with pipeline steel outer sleeve

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] 1. Preparation of composite tube blank

[0023] Such as figure 1 As shown, the corrosion-resistant superalloy inner tube blank 2 is first placed into the pipeline steel outer tube blank 1, and the corrosion-resistant superalloy inner tube blank 2 and the pipeline steel outer tube blank 1 form an inner tube blank and an outer tube blank before composite Gap 4, extending through the rolling mandrel 3 to the corrosion-resistant superalloy inner tube blank 2 for rotary extrusion (the rolling mandrel rotation speed is 20-250 rpm), to realize the corrosion-resistant superalloy inner tube blank of the composite tube blank 2 Plastic deformation, pipeline steel outer tube blank 1 Elastic deformation, so that the outer tube of the composite tube blank produces a state of compressive stress on the inner tube, so as to achieve a close physical combination of the inner wall of the outer tube of the composite tube blank and the outer wall of the inner tube of the composite tube blank...

Embodiment 1

[0033] Put the Inconel625 corrosion-resistant superalloy inner tube blank with an inner diameter of Φ134.4mm and a wall thickness of 15.1mm into an L450 pipeline steel outer tube blank with an inner diameter of Φ165mm and a wall thickness of 90mm, and squeeze it through the rolling mandrel rotation (rolling mandrel rotation The speed is 60 rpm), and the inner diameter of the corrosion-resistant superalloy inner tube is plastically deformed to Φ135mm, and the pipeline steel outer tube is elastically deformed to achieve the corrosion-resistant superalloy of the inner wall of the pipeline steel outer tube and the composite tube. The tight fit of the outer wall of the inner tube blank.

[0034] Under the protection of the glass protective coating, the composite tube blank is heated to 1200°C at a heating rate of 15°C / min, and kept for 40 minutes, and then the preheated composite tube blank is put into a hot extrusion machine and extruded The ratio is 10:1, the extrusion speed is 5...

Embodiment 2

[0036] Put the Inconel825 corrosion-resistant superalloy inner tube blank with an inner diameter of Φ99.4mm and a wall thickness of 10.1mm into an L450 pipeline steel outer tube blank with an inner diameter of Φ120mm and a wall thickness of 60mm, and squeeze it through the rolling mandrel rotation (rolling mandrel rotation The speed is 80 rpm), and the inner diameter of the corrosion-resistant superalloy inner tube is plastically deformed to Φ100mm, and the outer tube is elastically deformed to achieve the inner wall of the pipeline steel outer tube of the composite tube and the corrosion-resistant superalloy inner tube of the composite tube. Tight fit of the outer wall.

[0037] Under the protection of the glass protective coating, the composite tube blank is heated to 1180°C at a heating rate of 10°C / min, and kept for 40 minutes, and then the preheated composite tube blank is put into a hot extrusion machine and extruded The ratio is 5:1, the extrusion speed is 80mm / s, and t...

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Abstract

The invention relates to the field of processing of compound pipelines used for petroleum and natural gas, particularly relates to a compound pipe manufacturing technology for metallurgically bonding an anti-corrosion special alloy lining with a pipeline steel outer sleeve, solves the problems of poor comprehensive mechanical properties, low interface binding force and complexity in processing of a conventional compound pipe, and is applicable to compound pipelines with strong corrosion resistance and for conveying liquid or gas. The manufacturing technology comprises the steps as follows: preparing a compound pipe billet, putting an anti-corrosion special alloy inner pipe billet in a pipeline steel outer pipe billet, and tightly bonding the inner wall of the pipeline steel outer pipe billet of the compound pipe billet with the outer wall of an anti-corrosion and heat-resistant alloy inner pipe billet of the compound pipe billet through rotary extrusion of a roll expansion mandril; and heating the interface part of the inner and the outer pipe billets to the extrusion temperature under the protection of a protective coating, obtaining the finished compound pipe with the compound pipe billet through hot extrusion, and forming a diffusion layer at the interface part of the inner and the outer pipe billets under the conditions of high temperature and high pressure to realize favorable metallurgical bonding of the interface part of the inner and the outer pipe billets. The manufacturing technology is suitable for manufacturing compound pipes having anti-corrosion and heat-resistant alloy linings and having high requirements for bonding strength and mechanical property and used for oil and gas well drilling.

Description

technical field [0001] The invention relates to the processing field of composite pipelines for petroleum and natural gas, in particular to a composite pipe preparation process in which a special alloy lining and a pipeline steel jacket are metallurgically combined, and is suitable for high-strength corrosion-resistant composite pipelines for liquid or gas transportation. Background technique [0002] Stainless steel and superalloys are commonly used anti-corrosion materials in harsh environments. However, the cost of alloy pipe materials such as pure stainless steel and superalloys is relatively high, especially under high pressure conditions. Due to the thicker pipe wall, The required cost is higher. [0003] At present, the production methods of domestic carbon steel stainless steel pipe composite pipe mainly include: mechanical expansion forming, explosive forming, hydraulic expansion and other methods. The processes of these methods are different, but the principles ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/06
Inventor 张皓李应举
Owner 张皓
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