Production method for avoiding inner wall cracks of double-layer alloy composite pipe

A production method and technology for composite pipes, which are applied in the directions of pipes, rigid pipes, pipes/pipe joints/fittings, etc., can solve problems such as cracks on the inner wall of double-layer alloy composite pipes, and achieve difficult delamination cracking, crack prevention, and high bonding strength. Effect

Inactive Publication Date: 2015-09-16
HANDAN XINXING SPECIAL TUBING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a production method to solve the inner wall crack of double-layer alloy composite pipe

Method used

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  • Production method for avoiding inner wall cracks of double-layer alloy composite pipe
  • Production method for avoiding inner wall cracks of double-layer alloy composite pipe

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Experimental program
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Effect test

Embodiment 1

[0025] In the embodiment of the present invention, the material of the composite pipe is 15Mn / 316L, the material of the outer layer is 15Mn, and the material of the inner layer is 316L. The chemical composition of the outer layer and the inner layer meets the requirements of Table 1, and the specification is φ133mm×16mm / (outer layer 10mm+inner Layer 6mm) × 5000mm.

[0026] Table 1 Composition / mass fraction of 15Mn / 316L composite pipe (%)

[0027]

[0028] The specific production steps are as follows:

[0029] (1) Centrifugal casting double-layer alloy composite hollow billet

[0030] Smelt the outer layer 15Mn and inner layer 316L alloy liquid of the finished pipe respectively, pour the outer layer 15Mn first on the centrifugal casting machine, and then pour the inner layer 316L to prepare a double-layer alloy composite hollow billet. The specification of the composite pipe billet is φ250mm×80mm / (43.37mm outer layer + 36.63mm inner layer) × 1000mm.

[0031] The specifi...

Embodiment 2

[0045] The material of the composite pipe is 20Mn2 / 825, the material of the outer layer is 20Mn2, and the material of the inner layer is 825. The chemical composition of the outer layer and the inner layer meets the requirements in Table 2, and the specification is φ273mm×16.5mm / (outer layer 11mm+inner layer 5.5mm)× 6000mm.

[0046] Table 2 Composition / mass fraction of 20Mn2 / 825 composite pipe (%)

[0047]

[0048] The specific production steps are as follows:

[0049] (1) Centrifugal casting double-layer alloy composite hollow billet

[0050] Smelt the outer layer 20Mn2 and the inner layer 825 alloy liquid of the finished pipe respectively, cast the outer layer 20Mn2 first on the centrifugal casting machine, and then pour the inner layer 825 to prepare a double-layer alloy composite hollow billet. The specification of the double-layer alloy composite hollow billet is φ429mm×124.5mm / (outer layer 71.16mm+inner layer 53.34mm)×910mm.

[0051] The specific pouring process is...

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Abstract

The invention discloses a production method for avoiding inner wall cracks of a double-layer alloy composite pipe; the method comprises the following steps: producing a double-layer alloy composite hollow billet with a centrifugal casting technology; machining the inner wall and the outer wall of the hollow billet; after heating the hollow billet to be 1100 to 1180 DEG C uniformly, carrying out upsetting on the hollow billet by a forging machine along an axial direction; rolling the upset double-layer alloy composite hollow billet by a ring rolling mill to recover to a cylindrical shape; after heating the rolled double-layer alloy composite hollow billet to 1100 to 1150 DEG C uniformly, carrying out hole enlarging by a hole enlarging machine in a hole enlarging drum; then heating the hole enlarged double-layer alloy composite hollow billet to 1150 to 1230 DEG C uniformly; carrying out hot extrusion on the processed double-layer alloy composite hollow billet by an extruding machine to prepare the double-layer alloy composite pipe with the thickness consistent to the required thickness. By adopting the method to produce the double-layer alloy composite pipe, the cracks of the difficult-to-deform alloy on the inner layer can be effectively prevented, the yield is improved, the cost is low and the safety is high.

Description

technical field [0001] The invention relates to the technical field of pipe material preparation, in particular to a production method for solving cracks on the inner wall of a double-layer alloy composite pipe. Background technique [0002] Difficult-to-deform alloys refer to a class of alloys that have the characteristics of low processing plasticity, high deformation resistance and narrow deformation temperature range during thermal processing. Its chemical composition is complex, the degree of alloying is high, and it has good high temperature strength, oxidation resistance and comprehensiveness. It is used to manufacture high temperature parts and corrosion resistant parts of machinery in industries such as aviation, power generation, boiler, chemical industry and instrumentation. The trial production and production of difficult-to-deform alloy seamless pipes are carried out on the basis of the development of these alloy materials, which is an important aspect of the ap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00F16L9/02
Inventor 王锦永高杰
Owner HANDAN XINXING SPECIAL TUBING CO LTD
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