A high-strength corrosion-resistant titanium-steel composite pipe and its production process

A composite pipe and corrosion-resistant technology, applied in the field of composite pipes, can solve the problems affecting the interface bonding quality of composite materials, over-melting, cost reduction, etc., and achieve excellent fusion infiltration effect, reduce deformation rate, and reduce the effects of deformation effects.

Active Publication Date: 2021-05-18
江苏众信绿色管业科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The titanium-steel composite plate produced by the explosive cladding method not only has the corrosion resistance of titanium, but also has the strength and plasticity of ordinary steel plates as structural parts, and the most important thing is that the cost is greatly reduced, so it is widely used in various chemical reaction vessels. , heat exchanger materials and anti-corrosion fields, but the titanium-steel explosive welding interface is prone to over-melting and brittle intermetallic compounds, which affect the bonding quality of the composite material interface

Method used

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  • A high-strength corrosion-resistant titanium-steel composite pipe and its production process
  • A high-strength corrosion-resistant titanium-steel composite pipe and its production process
  • A high-strength corrosion-resistant titanium-steel composite pipe and its production process

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Effect test

Embodiment 1

[0032] A high-strength corrosion-resistant titanium-steel composite pipe, such as Figures 1 to 3 As shown, it includes an outer steel pipe 1 and an inner titanium pipe 2, the two are coaxially socketed, the inner wall of the steel pipe 1 is provided with a number of slots, the outer wall of the titanium pipe 2 is fixed with a number of rib assemblies 3, and the rib assembly 3 The outer wall is in interference fit with the inner wall of the steel pipe 1, and the inner wall of the steel pipe 1 and the outer wall of the titanium pipe 2 are filled with an alloy layer 4;

[0033] The alloy layer is made of nickel-based alloy, and the content of nickel in the nickel-based alloy is >90wt%. -0.5%, Fe<0.05%, C<0.1%, boron fiber 0.5-1.5%;

[0034] The cross-section of the slot is a trapezoidal structure (or fan-shaped structure or multi-layer ladder shape, which is not specifically limited here, and the contact area in the slot can be gradually increased from the outside to the inside...

Embodiment 2

[0038] The production process of high-strength and corrosion-resistant titanium-steel composite pipe includes the following steps:

[0039] 1) Take the steel pipe and the titanium pipe, carry out surface treatment on the steel pipe and the titanium pipe, then perform groove processing on the inner surface of the steel pipe, weld the rib assembly on the outer wall of the titanium pipe, and then carry out surface treatment on the steel pipe and the titanium pipe again;

[0040] 2) inserting the titanium tube into the steel tube, forming an interference fit through a drawing machine, the outer diameter of the rib assembly on the titanium tube is larger than the inner diameter of the steel tube, and the interference is 6-6.5%, and a composite tube blank is obtained;

[0041] 3) Cover both ends of the composite tube blank with the processed annular steel plate with reserved injection holes, then weld the two ends of the composite tube blank, inject molten alloy fluid between the com...

Embodiment 3

[0046] With reference to the pipeline structure of embodiment 1, the production process of embodiment 2, carry out specific operation;

[0047] A 304n stainless steel tube with an outer diameter of Φ100mm, a wall thickness of 8mm, and a length of 3m, and a TA2 titanium tube with an outer diameter of Φ80mm, a wall thickness of 5mm, and a length of 2.85m are selected as the composite outer tube and inner tube respectively;

[0048] The alloy layer is made of nickel-based alloy, the content of nickel element is >90wt%, and the nickel-based alloy includes the following element components in weight percentage: Cu 1.5%, Cr 4.7%, Nb 0.4%, Ta 0.3%, Fe 0.022%, C 0.06 %, boron fiber 1.1%.

[0049] In the metal injection molding technology, the loading of nickel-based alloy powder is 56.2vt%, the filler is paraffin or a mixture of paraffin and polyethylene glycol with a volume ratio of 5:1, the filler dosage is 36.5vt%, and the surfactant is stearic acid , the amount of surfactant is 7....

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Abstract

The present invention proposes a high-strength corrosion-resistant titanium-steel composite pipe and its production process, including an outer steel pipe and an inner titanium pipe, both of which are coaxially socketed, the inner wall of the steel pipe is provided with a number of slots, and the outer wall of the titanium pipe A number of rib assemblies are fixed, the outer wall of the rib assembly is in interference fit with the inner wall of the steel pipe, and the inner wall of the steel pipe and the outer wall of the titanium pipe are filled with an alloy layer; the present invention has a targeted design for the composite surface structure of titanium and steel pipes, And the alloy layer is filled, which effectively ensures the interlayer compactness and high interface bonding stability. At the same time, the filled alloy layer has a good guiding effect on the infiltration of metal elements under high temperature conditions. In addition, the rib component not only improves the strength but also has good The self-healing effect has an excellent compensation effect on the high-temperature deformation of the titanium tube, reduces the deformation rate, and significantly improves the comprehensive mechanical properties.

Description

technical field [0001] The invention relates to the technical field of composite pipes, in particular to a high-strength corrosion-resistant titanium-steel composite pipe and a production process thereof. Background technique [0002] Titanium-steel composite pipe has excellent corrosion resistance and remarkable economy, and can be widely used in petroleum and petrochemical, marine engineering, shipbuilding, chemical and other fields, and has broad application prospects. [0003] The titanium / steel composite pipe used in the transportation equipment of corrosive medium has the following main characteristics: 1) the outside can withstand a certain working pressure; 2) the inside has a certain corrosion resistance; 3) due to the relatively high density of titanium Low, so the composite pipe can also reduce weight under the premise of ensuring strength and corrosion resistance; 4) replacing the use of a single corrosion-resistant material can reduce assembly and manufacturing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22B22F3/10B22F3/24B22F7/08C22C19/05F16L9/02
CPCB22F3/10B22F3/225B22F3/24B22F7/064B22F2003/248C22C19/002C22C19/058F16L9/02
Inventor 孟宪虎姜庆风
Owner 江苏众信绿色管业科技有限公司
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