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High-strength corrosion resisting titanium-steel composite pipe and production technology thereof

A production process and technology for composite pipes, 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: 2019-09-24
江苏众信绿色管业科技有限公司
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  • Summary
  • 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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  • High-strength corrosion resisting titanium-steel composite pipe and production technology thereof
  • High-strength corrosion resisting titanium-steel composite pipe and production technology thereof
  • High-strength corrosion resisting titanium-steel composite pipe and production technology thereof

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Experimental program
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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 insid...

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 invention provides a high-strength corrosion resisting titanium-steel composite pipe and a production technology thereof. The high-strength corrosion resisting titanium-steel composite pipe comprises an outer-side steel pipe and an inner-side titanium pipe, wherein the outer-side steel pipe and the inner-side titanium pipe are coaxially sleeved; the inner wall of the steel pipe is provided with a plurality of open slots; the outer wall of the titanium pipe is provided with a plurality of rib components; the outer walls of the rib components are in interference fit with the inner wall of the steel pipe; a part between the inner wall of the steel pipe and the outer wall of the titanium pipe is filled with an alloy layer. According to the high-strength corrosion resisting titanium-steel composite pipe disclosed by the invention, a composite surface structure of the titanium pipe and the steel pipe is specifically designed and is filled with the alloy layer, so that the interlayer compactness is effectively ensured, and the interface bonding stability is high; meanwhile, the filled alloy layer has a good guiding effect on infiltration of metal elements under the condition of high temperature; besides, the rib components have the effect of improving the hardness, good self-repairing effect, and an excellent compensating effect on high-temperature deformation of the titanium pipe; the deformation degree is reduced and comprehensive mechanical properties are obviously improved.

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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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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