Thin-wall seamless steel tube

Abstract

The utility model relates to the technical field of steel pipes, in particular to a thin-wall seamless steel pipe. The thin-wall seamless steel pipe comprises an outer pipe body and an inner pipe body, the inner pipe body is coaxially arranged in the outer pipe body, and the space between the outer pipe body and the inner pipe body is filled with a honeycomb sandwich pipe; periodic corrugations are axially designed on the outer pipe body and the inner pipe body. According to the thin-wall seamless steel pipe provided by the utility model, the outer pipe body and the inner pipe body adopt the axial periodic corrugation design, and the aluminum alloy honeycomb sandwich pipe filled between the outer pipe body and the inner pipe body is combined, so that the overall weight is greatly reduced, the flexural rigidity is improved, and the compression resistance and the bending flexibility are further enhanced through the matching of the corrugation structure and the honeycomb core.

Description

Technical Field

[0001] This utility model relates to the field of steel pipe technology, and in particular to a thin-walled seamless steel pipe. Background Technology

[0002] Thin-walled seamless steel pipes, as lightweight structural materials, are widely used in aerospace, automotive manufacturing, and chemical equipment industries. Traditional thin-walled seamless steel pipes are mostly manufactured using a single layer of homogeneous material, resulting in problems such as high weight and insufficient bending stiffness. Furthermore, under harsh conditions such as high temperatures and corrosive media, their corrosion resistance and high-temperature stability are insufficient for long-term use. Existing technologies have addressed this by increasing the pipe wall thickness or using alloy coatings to improve performance, but this leads to increased weight and cost; while using corrugated pipe structures improves flexibility, it sacrifices compressive strength.

[0003] Therefore, it is necessary to provide a new thin-walled seamless steel pipe to solve the above-mentioned technical problems. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a thin-walled seamless steel pipe.

[0005] The thin-walled seamless steel pipe provided by this utility model includes an outer tube body and an inner tube body. The inner tube body is coaxially arranged inside the outer tube body, and a honeycomb sandwich tube is filled between the outer tube body and the inner tube body.

[0006] Both the outer tube and the inner tube are designed with periodic corrugations in the axial direction.

[0007] The protruding A portion inside the outer tube is arranged opposite to the protruding A portion inside the inner tube, and the concave A portion inside the outer tube is arranged opposite to the concave A portion inside the inner tube.

[0008] The inner and outer ring walls of the honeycomb sandwich tube are each provided with a raised B portion and a recessed B portion (32).

[0009] Preferably, the protrusions B on the inner and outer ring walls of the honeycomb sandwich tube are respectively attached to the recesses A on the outer and inner tube bodies, and the recesses B on the inner and outer ring walls of the honeycomb sandwich tube are respectively attached to the recesses A on the outer and inner tube bodies.

[0010] Preferably, the wavelength of the outer tube and the inner tube is 5-10 mm, and the wave height is 1-2 mm.

[0011] Preferably, the honeycomb sandwich tube is made of aluminum alloy honeycomb core.

[0012] Preferably, both the outer tube and the inner tube are composed of a base layer, a nickel-based alloy, and a ceramic coating. The outer ring wall of the base layer is bonded to the nickel-based alloy by hot isostatic diffusion, and the ceramic coating is formed on the inner ring wall of the base layer by plasma spraying to form a 5-10 μm aluminum oxide / titanium nitride coating.

[0013] Preferably, the base layer is made of duplex stainless steel.

[0014] Compared with related technologies, the thin-walled seamless steel pipe provided by this utility model has the following beneficial effects:

[0015] In this invention, the outer and inner tubes adopt an axial periodic corrugated design, combined with an aluminum alloy honeycomb sandwich tube filled in the middle, which greatly reduces the overall weight and improves the bending stiffness. The combination of the corrugated structure and the honeycomb core further enhances the compressive strength and bending flexibility. Attached Figure Description

[0016] Figure 1 A schematic diagram of a preferred embodiment of the thin-walled seamless steel pipe provided by this utility model;

[0017] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the structure.

[0018] Figure 3 for Figure 1 The diagram shows the composite structure of the outer tube.

[0019] The following are the labels in the diagram: 1. Outer tube; 2. Inner tube; 1-2-1. Protruding part A; 1-2-2. Recessed part A; 3. Honeycomb sandwich tube; 31. Protruding part B; 32. Recessed part B; 11. Base layer; 12. Nickel-based alloy layer; 13. Ceramic coating. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0022] Please see Figures 1 to 3 The present invention provides a thin-walled seamless steel pipe, which includes an outer tube body 1, an inner tube body 2, and a honeycomb sandwich tube 3.

[0023] In the embodiments of this utility model, please refer to Figure 1 and Figure 3The outer tube 1 is provided with an inner tube 2 arranged coaxially, and a honeycomb sandwich tube 3 is filled between the outer tube 1 and the inner tube 2. The honeycomb sandwich tube 3 is an aluminum alloy honeycomb core. Both the outer tube 1 and the inner tube 2 are composed of a base layer 11, a nickel-based alloy 12 and a ceramic coating 13. The outer ring wall of the base layer 11 is bonded to the nickel-based alloy 12 by hot isostatic diffusion, and the ceramic coating 13 is formed on the inner ring wall of the base layer 11 by plasma spraying to form a 5-10 μm aluminum oxide / titanium nitride coating. The base layer 11 is made of duplex stainless steel.

[0024] It should be noted that: the duplex stainless steel (such as 2205 steel) used in the outer tube 1 and inner tube 2 of this application is the base layer 11, which has both austenitic and ferritic properties, greatly improving the strength of the thin-walled seamless steel pipe. The 5-10μm aluminum oxide / titanium nitride coating formed on the inner wall of the steel pipe by plasma spraying effectively enhances the wear resistance and corrosion resistance of the thin-walled seamless steel pipe. The nickel-based alloy 12 not only improves the high temperature resistance of the thin-walled seamless steel pipe, but also avoids the risk of interface peeling through hot isostatic diffusion bonding. The aluminum alloy honeycomb core filled between the outer tube 1 and the inner tube 2 greatly reduces the overall weight of the steel pipe and effectively improves its bending stiffness.

[0025] In the embodiments of this utility model, please refer to Figure 1 and Figure 2 Both the outer tube 1 and the inner tube 2 are designed with periodic corrugations in the axial direction, and the wavelength of the outer tube 1 and the inner tube 2 is 5-10mm, and the wave height is 1-2mm.

[0026] The protruding A portion 1-2-1 inside the outer tube 1 is arranged opposite to the protruding A portion 1-2-1 inside the inner tube 2. The concave A portion 1-2-2 inside the outer tube 1 is arranged opposite to the concave A portion 1-2-2 inside the inner tube 2. The inner and outer ring walls of the honeycomb sandwich tube 3 are sequentially distributed with protruding B portions 31 and concave B portions 32. The protruding B portions 31 on the inner and outer ring walls of the honeycomb sandwich tube 3 are respectively attached to the concave A portions 1-2-2 on the outer tube 1 and the inner tube 2. The concave B portions 32 on the inner and outer ring walls of the honeycomb sandwich tube 3 are respectively attached to the concave A portions 1-2-2 on the outer tube 1 and the inner tube 2.

[0027] It should be noted that the outer tube 1 and the inner tube 2 are designed with periodic corrugations to form a corrugated pipe structure. Combined with the filled aluminum alloy honeycomb core, the thin-walled seamless steel pipe maintains bending flexibility while improving its compressive strength.

[0028] In this embodiment, the protruding B part 31 and the concave B part 32 on the honeycomb sandwich tube 3 fit together with the concave A part 1-2-2 and the protruding A part 1-2-1 on the outer tube body 1 and the inner tube body 2, thereby improving the connection strength between the outer tube body 1, the honeycomb sandwich tube 3 and the inner tube body 2.

[0029] In this application, the outer tube 1 and the inner tube 2 adopt an axial periodic corrugated design (wavelength 5-10mm, wave height 1-2mm), combined with the aluminum alloy honeycomb sandwich tube 3 filled in the middle, which greatly reduces the overall weight and improves the bending stiffness. The corrugated structure and the honeycomb core further enhance the compressive strength and bending flexibility. The outer tube 1 and the inner tube 2 are composed of a duplex stainless steel base layer 11, a nickel-based alloy layer 12 and a ceramic coating 13. The ceramic coating (alumina / titanium nitride, thickness 5-10μm) is formed on the inner wall by plasma spraying, which significantly improves wear resistance and corrosion resistance. The nickel-based alloy layer 12 is bonded by hot isostatic pressing diffusion to avoid interface peeling and enhance high temperature stability.

[0030] The protruding B part 31 and the concave B part 32 of the honeycomb sandwich tube 3 are precisely fitted with the corrugated concave A part 1-2-2 of the outer tube body 1 and the inner tube body 2. The interface bonding strength is improved through mechanical interlocking to avoid the risk of delamination.

[0031] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A thin-walled seamless steel pipe, characterized in that, It includes an outer tube (1) and an inner tube (2), wherein the outer tube (1) is provided with an inner tube (2) arranged coaxially, and a honeycomb sandwich tube (3) is filled between the outer tube (1) and the inner tube (2); Both the outer tube (1) and the inner tube (2) are designed with periodic corrugations in the axial direction; The protruding A portion (1-2-1) inside the outer tube (1) is opposite to the protruding A portion (1-2-1) inside the inner tube (2), and the concave A portion (1-2-2) inside the outer tube (1) is opposite to the concave A portion (1-2-2) inside the inner tube (2); The inner and outer ring walls of the honeycomb sandwich tube (3) are respectively provided with a protruding B part (31) and a concave B part (32).

2. The thin-walled seamless steel pipe according to claim 1, characterized in that, The protruding B part (31) on the inner and outer ring walls of the honeycomb sandwich tube (3) is respectively attached to the recessed A part (1-2-2) provided on the outer tube body (1) and the inner tube body (2), and the recessed B part (32) on the inner and outer ring walls of the honeycomb sandwich tube (3) is respectively attached to the recessed A part (1-2-2) provided on the outer tube body (1) and the inner tube body (2).

3. The thin-walled seamless steel pipe according to claim 1, characterized in that, The wavelengths of the outer tube (1) and the inner tube (2) are 5-10 mm and the wave heights are 1-2 mm.

4. The thin-walled seamless steel pipe according to claim 1, characterized in that, The honeycomb sandwich tube (3) is made of aluminum alloy honeycomb core.

5. The thin-walled seamless steel pipe according to claim 1, characterized in that, Both the outer tube (1) and the inner tube (2) are composed of a base layer (11), a nickel-based alloy (12) and a ceramic coating (13). The outer ring wall of the base layer (11) is bonded to the nickel-based alloy (12) by hot isostatic diffusion, and the ceramic coating (13) is formed on the inner ring wall of the base layer (11) by plasma spraying to form a 5-10 μm aluminum oxide / titanium nitride coating.

6. The thin-walled seamless steel pipe according to claim 5, characterized in that, The base layer (11) is made of duplex stainless steel.

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