Search

CN-224229461-U - Thin-wall seamless steel pipe

CN224229461UCN 224229461 UCN224229461 UCN 224229461UCN-224229461-U

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, wherein the inner pipe body is coaxially arranged in the outer pipe body, a honeycomb sandwich pipe is filled between the outer pipe body and the inner pipe body, and periodic waves are axially designed on the outer pipe body and the inner pipe body. According to the thin-wall seamless steel pipe, the outer pipe body and the inner pipe body are designed in an axial periodic corrugated manner, the aluminum alloy honeycomb sandwich pipe filled in the middle is combined, so that the overall weight is greatly reduced, meanwhile, the bending rigidity is improved, and the compression resistance and the bending flexibility are further enhanced through cooperation of the corrugated structure and the honeycomb core.

Inventors

  • WANG YUJIE
  • HU JINPING
  • GAO FULIANG

Assignees

  • 天津市石化管件有限公司

Dates

Publication Date
20260512
Application Date
20250628

Claims (6)

  1. 1. The thin-wall seamless steel pipe is characterized by comprising an outer pipe body (1) and an inner pipe body (2), wherein the inner pipe body (2) which is coaxially arranged is arranged in the outer pipe body (1), and a honeycomb sandwich pipe (3) is filled between the outer pipe body (1) and the inner pipe body (2); periodic waves are axially designed on the outer pipe body (1) and the inner pipe body (2); The convex A part (1-2-1) in the outer pipe body (1) is opposite to the convex A part (1-2-1) in the inner pipe body (2), and the concave A part (1-2-2) in the outer pipe body (1) is opposite to the concave A part (1-2-2) in the inner pipe body (2); the inner ring wall and the outer ring wall of the honeycomb sandwich pipe (3) are sequentially provided with a convex B part (31) and a concave B part (32).
  2. 2. The thin-walled seamless steel pipe according to claim 1, wherein the convex B parts (31) on the inner ring wall and the outer ring wall of the honeycomb sandwich pipe (3) are respectively attached to the concave a parts (1-2-2) arranged on the outer pipe body (1) and the inner pipe body (2), and the concave B parts (32) on the inner ring wall and the outer ring wall of the honeycomb sandwich pipe (3) are respectively attached to the concave a parts (1-2-2) arranged on the outer pipe body (1) and the inner pipe body (2).
  3. 3. A thin-walled seamless steel pipe according to claim 1 characterized in that the wavelength of the outer (1) and inner (2) pipe is 5-10mm and the wave height is 1-2mm.
  4. 4. A thin-walled seamless steel pipe according to claim 1 characterized in that the honeycomb sandwich pipe (3) is an aluminium alloy honeycomb core.
  5. 5. The thin-walled seamless steel pipe according to claim 1, characterized in that the outer pipe body (1) and the inner pipe body (2) are each 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 with the nickel-based alloy (12) by hot isostatic pressing diffusion, and the ceramic coating (13) forms an aluminum oxide/titanium nitride coating of 5-10 μm on the inner ring wall of the base layer (11) by plasma spraying.
  6. 6. A thin-walled seamless steel pipe according to claim 5 characterized in that the base layer (11) is made of duplex stainless steel.

Description

Thin-wall seamless steel pipe Technical Field The utility model relates to the technical field of steel pipes, in particular to a thin-wall seamless steel pipe. Background The thin-wall seamless steel tube is used as a lightweight structural material and is widely applied to the fields of aerospace, automobile manufacturing, chemical equipment and the like. The traditional thin-wall seamless steel tube is mostly manufactured by adopting single-layer homogeneous materials, and has the problems of larger weight, insufficient bending stiffness and the like. In addition, under severe working conditions such as high temperature, corrosive medium and the like, the corrosion resistance and the high temperature stability of the alloy are difficult to meet long-term use requirements. In the prior art, part of the improvement schemes improve the performance by increasing the pipe wall thickness or adopting an alloy coating, but the weight and the cost are increased, and the corrugated pipe structure can improve the flexibility and sacrifice the compressive strength. Therefore, there is a need to provide a new thin-walled seamless steel pipe that solves the above-mentioned technical problems. Disclosure of utility model In order to solve the technical problems, the utility model provides a thin-wall seamless steel pipe. The thin-wall seamless steel pipe comprises an outer pipe body and an inner pipe body, wherein the inner pipe body is coaxially arranged in the outer pipe body, and a honeycomb sandwich pipe is filled between the outer pipe body and the inner pipe body; Periodic waves are axially designed on the outer pipe body and the inner pipe body; The convex part A in the outer tube body is opposite to the convex part A in the inner tube body, and the concave part A in the outer tube body is opposite to the concave part A in the inner tube body; The inner ring wall and the outer ring wall of the honeycomb sandwich pipe are sequentially provided with a convex B part and a concave B part (32). Preferably, the convex parts B on the inner ring wall and the outer ring wall of the honeycomb sandwich pipe are respectively attached to the concave parts A arranged on the outer pipe body and the inner pipe body, and the concave parts B on the inner ring wall and the outer ring wall of the honeycomb sandwich pipe are respectively attached to the concave parts A arranged on the outer pipe body and the inner pipe body. Preferably, the wavelength of the outer pipe body and the inner pipe body is 5-10mm, and the wave height is 1-2mm. Preferably, the honeycomb sandwich pipe is an aluminum alloy honeycomb core. Preferably, the outer pipe body and the inner pipe body are both composed of a base layer, nickel base alloy and a ceramic coating, wherein the outer ring wall of the base layer is combined with the nickel base alloy through hot isostatic pressure diffusion, and the ceramic coating is formed into an aluminum oxide/titanium nitride coating with the thickness of 5-10 mu m on the inner ring wall of the base layer through plasma spraying. Preferably, the base layer is made of duplex stainless steel. Compared with the related art, the thin-wall seamless steel pipe provided by the utility model has the following beneficial effects: According to the utility model, the outer pipe body and the inner pipe body adopt an axial periodic corrugated design, and the aluminum alloy honeycomb sandwich pipe filled in the middle is combined, so that the overall weight is greatly reduced, meanwhile, the bending rigidity is improved, and the compression resistance and the bending flexibility are further enhanced by the cooperation of the corrugated structure and the honeycomb core. Drawings FIG. 1 is a schematic structural view of a preferred embodiment of a thin-walled seamless steel pipe according to the present utility model; FIG. 2 is a schematic cross-sectional view of the structure shown in FIG. 1; Fig. 3 is a schematic view of the composite structure of the outer tube body shown in fig. 1. The number of the drawing is 1, the number of the outer pipe body, 2, the number of the inner pipe body, 1-2-1, the number of the convex A part, 1-2-2, the number of the concave A part, 3, the honeycomb sandwich pipe, 31, the number of the convex B part, 32, the number of the concave B part, 11, the base layer, 12, the nickel-based alloy layer, 13 and the ceramic coating. Detailed Description The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. Specific implementations of the utility model are described in detail below in connection with specific embodiments. Referring to fig. 1 to 3, the thin-walled seamless steel pipe provi