Corrosion-resistant seamless steel pipe
Patent Information
- Application Number
- CN202522266574.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-27
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-10-27
AI Technical Summary
然而，热镀锌层在长期使用或高温环境下容易老化脱落，失去保护作用；采用不锈钢等耐腐蚀合金材料则成本较普通碳钢高出3-5倍，会大幅增加制造成本，限制了其在许多领域的广泛应用
[0014]本实用新型相较于易老化脱落的热镀锌层，其通过螺旋导流筋的物理结构实现腐蚀风险转移，当腐蚀性流体在管内流动时，螺旋导流筋会强制流体从传统的直线紊流转变为有序的螺旋状流动，流动过程中产生的离心力会将流体中腐蚀性更强的杂质（如盐分、酸性颗粒等）甩向螺旋流道外侧的导流筋表面，使密度较低的纯净流体集中在靠近钢管本体内壁的流道内侧，从而减少腐蚀性成分与钢管本体主内壁的直接接触和冲刷，避免内壁热镀锌层脱落失效后的腐蚀问题，防护效果更持久；且相较于成本高昂的不锈钢等耐腐蚀合金材料，其钢管本体可沿用普通碳钢材质，仅导流筋可按需选用耐磨防腐材质，降低制造成本。
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Figure CN224886520U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of seamless steel pipe technology, and more specifically, to a corrosion-resistant seamless steel pipe. Background Technology
[0002] Seamless steel pipes are widely used in petrochemical, municipal water supply, and marine engineering fields. However, when transporting corrosive fluids, internal wall corrosion seriously affects service life and safety.
[0003] To combat corrosion, existing technologies typically involve applying a hot-dip galvanized layer to the inner wall or using corrosion-resistant alloy materials such as stainless steel throughout the seamless steel pipe. However, the hot-dip galvanized layer is prone to aging and peeling off under long-term use or high-temperature environments, losing its protective function; using corrosion-resistant alloy materials such as stainless steel is 3-5 times more expensive than ordinary carbon steel, significantly increasing manufacturing costs and limiting its widespread application in many fields. Summary of the Invention
[0004] The purpose of this application is to provide a corrosion-resistant seamless steel pipe that can solve the technical problems mentioned in the background art.
[0005] This application provides a corrosion-resistant seamless steel pipe, including a steel pipe body, which is a hollow seamless steel pipe. The steel pipe body is provided with a plurality of spiral guide ribs, which are spirally arranged along the axial direction of the steel pipe body. The spiral guide ribs divide the internal space of the steel pipe body into at least one spiral flow channel.
[0006] Furthermore, the height of the spiral guide rib is 1 / 20 to 1 / 10 of the inner diameter of the steel pipe body.
[0007] Furthermore, the steel pipe body includes an inner pipe and an outer pipe, the spiral guide rib is integrally formed on the inner wall of the inner pipe, and the inner pipe is embedded in the outer pipe.
[0008] Furthermore, a slope is provided at the connection between the spiral guide rib and the inner tube.
[0009] Furthermore, the inner wall of the outer tube is provided with a plurality of fitting grooves evenly distributed along the periphery of the outer tube, the fitting grooves extending to both ends of the outer tube, and the outer wall of the inner tube is provided with a plurality of fitting parts adapted to the fitting grooves, the fitting parts being fitted into the fitting grooves.
[0010] Furthermore, the outer tube is provided with connecting flanges at both ends.
[0011] Furthermore, the angle between the inclined surface of the ramp and the tangential surface of the spiral guide rib is 120° to 140°.
[0012] Furthermore, the outer wall of the outer tube is coated with an anti-corrosion layer.
[0013] The beneficial effects of this utility model are:
[0014] Compared to the easily aging and peeling hot-dip galvanized layer, this invention achieves corrosion risk transfer through the physical structure of the spiral guide ribs. When corrosive fluid flows inside the pipe, the spiral guide ribs force the fluid to change from traditional straight turbulent flow to orderly spiral flow. The centrifugal force generated during the flow process throws more corrosive impurities (such as salt, acid particles, etc.) in the fluid towards the surface of the guide ribs on the outside of the spiral flow channel, so that the lower density pure fluid is concentrated on the inner side of the flow channel close to the inner wall of the steel pipe body. This reduces the direct contact and scouring between corrosive components and the main inner wall of the steel pipe body, avoiding corrosion problems after the hot-dip galvanized layer on the inner wall peels off and fails, resulting in a more durable protective effect. Moreover, compared to expensive stainless steel and other corrosion-resistant alloy materials, the steel pipe body can be made of ordinary carbon steel, and only the guide ribs can be made of wear-resistant and corrosion-resistant materials as needed, reducing manufacturing costs. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 These are schematic diagrams of structures in some embodiments of this application;
[0017] Figure 2 This is a first cross-sectional view of some embodiments of this application;
[0018] Figure 3 This is a second cross-sectional view of some embodiments of this application;
[0019] The reference numerals in the attached figures are as follows:
[0020] 1. Steel pipe body; 11. Inner pipe; 111. Fitting part; 12. Outer pipe; 121. Fitting groove; 2. Spiral guide rib; 3. Slope; 4. Connecting flange; 5. Anti-corrosion layer. Detailed Implementation
[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0022] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0023] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Specific Implementation
[0027] like Figure 1-3As shown, this application provides a corrosion-resistant seamless steel pipe, including a steel pipe body 1, which is a hollow seamless steel pipe. The steel pipe body 1 has several spiral guide ribs 2 arranged spirally along the axial direction of the steel pipe body 1, dividing the internal space of the steel pipe body 1 into at least one spiral flow channel. When a corrosive fluid flows inside the pipe, the spiral guide ribs 2 force the fluid to change from traditional straight-line turbulent flow to orderly spiral flow. The centrifugal force generated during the flow process throws more corrosive impurities in the fluid towards the surface of the guide ribs outside the spiral flow channel, making the flow more efficient. The lower purity fluid is concentrated on the inner side of the flow channel near the inner wall of the steel pipe body 1, thereby reducing the direct contact and erosion between corrosive components and the main inner wall of the steel pipe body 1. This avoids shortening the service life of the steel pipe body 1 due to direct corrosion. Compared with the hot-dip galvanized layer that is prone to aging and peeling off, it achieves corrosion risk transfer through the physical structure of the spiral guide ribs 2, avoiding corrosion problems after the hot-dip galvanized layer on the inner wall peels off and fails, resulting in a more durable protective effect. Moreover, compared with expensive stainless steel and other corrosion-resistant alloy materials, the steel pipe body 1 can be made of ordinary carbon steel, and only the guide ribs can be made of wear-resistant and corrosion-resistant materials as needed, reducing manufacturing costs.
[0028] like Figure 1-3 As shown, the height of the spiral guide rib 2 is 1 / 20 to 1 / 10 of the inner diameter of the steel pipe body 1. It can force the fluid to form a spiral flow and generate sufficient centrifugal force through the spiral structure to throw corrosive impurities to the surface of the rib to protect the inner wall of the steel pipe. It can also avoid excessive reduction of the flow channel cross-sectional area due to excessive height of the rib, ensuring that the fluid flow resistance is within a reasonable range and maintaining normal conveying efficiency. Specifically, the height of the spiral guide rib 2 is 1 / 15 of the inner diameter of the steel pipe body 1.
[0029] like Figure 2 and Figure 3 As shown, the steel pipe body 1 includes an inner pipe 11 and an outer pipe 12. The spiral guide rib 2 is integrally formed on the inner wall of the inner pipe 11, and the inner pipe 11 is embedded in the outer pipe 12. The inner pipe 11 is embedded in the outer pipe 12 to form a double structure. Even if the inner pipe 11 is locally corroded due to long-term use, the outer pipe 12 can act as a second barrier to block the penetration of corrosive media. At the same time, the nesting and cooperation of the inner pipe 11 and the outer pipe 12 can buffer the impact of temperature changes or external force on the pipeline and avoid the problem of easy damage to a single pipe structure.
[0030] like Figure 2 As shown, a ramp 3 is provided at the connection between the spiral guide rib 2 and the inner tube 11. The ramp 3 structure can smoothly transition the connection interface between the spiral guide rib 2 and the inner tube 11 wall, avoiding the dead angle of fluid turbulence formed by right angle or acute angle connection. At the same time, it can prevent the centrifugal force generated during fluid flow from throwing more corrosive impurities in the fluid towards the inner wall of the inner tube 11, thereby reducing corrosion of the inner wall of the inner tube 11.
[0031] like Figure 3 As shown, the inner wall of the outer tube 12 is provided with a plurality of fitting grooves 121 evenly distributed along the circumference of the outer tube 12. The fitting grooves 121 extend to both ends of the outer tube 12. The outer wall of the inner tube 11 is provided with a plurality of fitting parts 111 adapted to the fitting grooves 121. The fitting parts 111 are embedded in the fitting grooves 121. Specifically, the fitting parts 111 and the fitting grooves 121 are interference fit. During assembly, the fitting parts 111 squeeze the fitting grooves 121 to achieve a tight connection, which restricts the relative displacement of the inner tube 11 and the outer tube 12 in the circumferential and axial directions. The inner tube 11 and the outer tube 12 can be stably assembled without additional connecting parts, avoiding structural loosening caused by aging and failure of connecting parts.
[0032] like Figure 1-3 As shown, the outer pipe 12 is provided with connecting flanges 4 at both ends; the connection flanges 4, together with bolts and nuts, facilitate the connection of adjacent pipes. When adjacent pipes are connected, the fluid leakage from the connection point is blocked by placing a sealing ring (such as a rubber sealing ring) between the sealing surfaces of the flanges to fill the tiny gaps.
[0033] like Figure 2 As shown, the angle between the inclined surface of the ramp 3 and the tangent of the spiral guide rib 2 is 120° to 140°; this angle can maintain the centrifugal force stability of the spiral flow channel and ensure that corrosive impurities are continuously thrown onto the surface of the guide rib. Specifically, the angle between the inclined surface of the ramp 3 and the tangent of the spiral guide rib 2 is 130°.
[0034] like Figure 2 and Figure 3 As shown, the outer wall of the outer pipe 12 is coated with an anti-corrosion layer; the anti-corrosion layer prevents the outer wall of the outer pipe 12 from being corroded by external environmental corrosive media, reducing the frequency of pipe replacement and maintenance costs.
[0035] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A corrosion-resistant seamless steel pipe, characterized in that: The device includes a steel pipe body, which is a hollow seamless steel pipe. The steel pipe body has a plurality of spiral guide ribs arranged in a spiral shape along the axial direction of the steel pipe body. The spiral guide ribs divide the internal space of the steel pipe body into at least one spiral flow channel.
2. The corrosion-resistant seamless steel pipe according to claim 1, characterized in that: The height of the spiral guide rib is 1 / 20 to 1 / 10 of the inner diameter of the steel pipe body.
3. The corrosion-resistant seamless steel pipe according to claim 1, characterized in that: The steel pipe body includes an inner pipe and an outer pipe. The spiral guide rib is integrally formed on the inner wall of the inner pipe, and the inner pipe is embedded in the outer pipe.
4. The corrosion-resistant seamless steel pipe according to claim 3, characterized in that: The connection between the spiral guide rib and the inner tube is provided with a slope.
5. The corrosion-resistant seamless steel pipe according to claim 4, characterized in that: The inner wall of the outer tube is provided with a plurality of fitting grooves evenly distributed along the periphery of the outer tube, the fitting grooves extending to both ends of the outer tube, and the outer wall of the inner tube is provided with a plurality of fitting parts adapted to the fitting grooves, the fitting parts being fitted into the fitting grooves.
6. The corrosion-resistant seamless steel pipe according to claim 3, characterized in that: The outer tube is equipped with connecting flanges at both ends.
7. The corrosion-resistant seamless steel pipe according to claim 4, characterized in that: The angle between the inclined surface of the ramp and the tangential surface of the spiral guide bar is 120° to 140°.
8. The corrosion-resistant seamless steel pipe according to claim 3, characterized in that: The outer wall of the outer tube is coated with an anti-corrosion layer.