Corrosion-resistant seamless steel pipe for chemical industry
By using multi-layer corrosion-resistant materials on seamless steel pipes, the problem of seamless steel pipes being easily corroded in strong corrosion environments in chemical production is solved, significantly improving corrosion resistance, extending service life and reducing maintenance costs.
Patent Information
- Application Number
- CN202421790487.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-04-18
- Estimated Expiration
- 2034-07-26
AI Technical Summary
Existing seamless steel pipes are prone to corrosion and perforation in strong corrosion environments in chemical production, resulting in leakage accidents, affecting production safety and increasing maintenance costs.
Composite applications of multi-layer corrosion-resistant materials include seamless steel pipe matrix, nickel-based alloy first anticorrosion coating, nanoceramic second anticorrosion coating, epoxy powder coating, epoxy coal asphalt cold-wrap belt and asphalt anticorrosion layer, combined with wear-resistant steel wire and joint pipe design, a multi-layer protective barrier is formed.
It significantly improves the corrosion resistance of seamless steel pipes, extends service life, reduces the risk of leakage accidents and maintenance costs, and provides reliable and long-lasting protection in a highly corrosive environment.
Smart Images
Figure CN222772789U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of seamless steel pipes, in particular to a corrosion-resistant seamless steel pipe for chemical industry. Background Art
[0002] Seamless steel pipe is a steel pipe with a hollow cross-section and no seams on the surface. It is usually made by perforating a whole round steel. This kind of steel pipe has a wide range of applications in many fields due to its unique structure and excellent performance. According to the production method, seamless steel pipes can be divided into hot-rolled seamless steel pipes, cold-rolled seamless steel pipes, cold-drawn seamless steel pipes, extruded seamless steel pipes, jacking pipes, etc. According to the cross-sectional shape, seamless steel pipes are divided into round and special-shaped pipes. Special-shaped pipes include square, oval, triangular, hexagonal and other complex shapes. Seamless steel pipes are mainly used as petroleum geological drilling pipes, cracking pipes for petrochemicals, boiler pipes, bearing pipes, and high-precision structural steel pipes for automobiles, tractors, and aviation.
[0003] In the chemical production process, the pipeline system, as a key part of material transportation, often needs to withstand the erosion of various corrosive media. Chemical pipeline systems are usually composed of seamless steel pipes, which are prone to corrosion and perforation in a strong corrosive environment, leading to leakage accidents, which not only affects production safety but also increases maintenance costs. Therefore, the development of a seamless steel pipe with excellent corrosion resistance is of great significance to ensure the safety and economy of chemical production. Utility Model Content
[0004] In view of the existing deficiencies, the utility model provides a corrosion-resistant seamless steel pipe for chemical industry, which significantly improves the corrosion resistance of the seamless steel pipe through the composite application of multiple layers of corrosion-resistant materials, and is particularly suitable for the strong corrosion environment in the chemical industry.
[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A corrosion-resistant seamless steel pipe for chemical use comprises a seamless steel pipe substrate and a first anti-corrosion coating, wherein a first anti-corrosion coating is sprayed on the inner surface of the seamless steel pipe substrate, a second anti-corrosion coating is sprayed on the outer side of the first anti-corrosion coating, an epoxy powder coating is provided on the outer surface of the seamless steel pipe substrate, a layer of epoxy coal tar cold wrapping tape is wrapped around the outer side of the epoxy powder coating, and a layer of asphalt anti-corrosion layer is coated on the surface of the epoxy coal tar cold wrapping tape.
[0007] Furthermore, wear-resistant steel wire is arranged on the surface of the asphalt anti-corrosion layer, and the wear-resistant steel wire is in a spirally wound structure.
[0008] Furthermore, the first anti-corrosion coating is a nickel-based alloy layer, and the coating thickness is 0.2-0.5 mm.
[0009] Furthermore, the second anti-corrosion coating is a nano-ceramic coating with a coating thickness of 0.1-0.3 mm.
[0010] Furthermore, a joint pipe is welded and fixed inside the front end of the seamless steel pipe base, a plurality of groups of limit blocks are fixed on the annular surface of the joint pipe, and a gap is left between the rear end of the limit block and the front end of the seamless steel pipe base, and a plurality of groups of plug holes are opened inside the front end surface of the seamless steel pipe base.
[0011] Furthermore, a plurality of groups of limit slots matched with the limit blocks are evenly arranged on the inner wall of the rear port of the seamless steel tube substrate, and a plurality of groups of plug-in rods are fixedly arranged on the rear end surface of the seamless steel tube substrate, and the specifications of the plug-in rods are matched with the plug-in holes.
[0012] Furthermore, the edges of the front port and the rear port of the seamless steel pipe substrate are both provided with inclined grooves.
[0013] Compared with the prior art, the utility model has the following beneficial effects:
[0014] 1. The utility model significantly improves the corrosion resistance of seamless steel pipes through the composite application of multiple layers of corrosion-resistant materials. It is particularly suitable for the strong corrosion environment in the chemical industry. The improvement of corrosion resistance effectively extends the service life of seamless steel pipes and reduces the risk of leakage accidents caused by corrosion. In addition, due to the improvement of corrosion resistance, the maintenance and replacement frequency caused by corrosion is reduced, thereby reducing the overall maintenance cost.
[0015] 2. The utility model can form an extra protective layer on the surface of the asphalt anti-corrosion layer by the wear-resistant steel wire, which can effectively resist the wear of the external environment and prevent the asphalt anti-corrosion layer from being worn due to friction with the ground during paving construction, thereby ensuring the anti-corrosion effect of the asphalt anti-corrosion layer.
[0016] 3. The utility model facilitates the rapid connection of adjacent seamless steel pipes during pipeline construction by providing a joint pipe, thereby ensuring the connection stability between seamless steel pipes. Multiple sets of limit card slots can be used to insert the limit card blocks into the limit card slots when connecting the pipelines, thereby realizing the rapid connection and positioning between the seamless steel pipe substrates, thereby preventing the offset from affecting the subsequent welding work, and at the same time, multiple sets of plug-in rods can be inserted into the plug-in holes, thereby further improving the connection stability between the seamless steel pipe substrates. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.
[0018] Figure 2 This is a schematic structural diagram of the utility model from another angle.
[0019] Figure 3 It is a cross-sectional view of the utility model.
[0020] Figure 4 It is a schematic diagram of the pipeline connection of the utility model.
[0021] In the figure: 1. seamless steel pipe substrate; 2. asphalt anti-corrosion layer; 3. wear-resistant steel wire; 4. joint pipe; 5. limit block; 6. plug-in hole; 7. plug-in rod; 8. limit slot; 9. epoxy coal tar cold wrap; 10. epoxy powder coating; 11. first anti-corrosion coating; 12. second anti-corrosion coating; 13. groove. DETAILED DESCRIPTION
[0022] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] As the first embodiment of the utility model:
[0024] like Figures 1 to 3 As shown, a corrosion-resistant seamless steel pipe for chemical use includes a seamless steel pipe substrate 1 and a first anti-corrosion coating 11. A first anti-corrosion coating 11 is sprayed on the inner surface of the seamless steel pipe substrate 1, and a second anti-corrosion coating 12 is sprayed on the outside of the first anti-corrosion coating 11. An epoxy powder coating 10 is provided on the outer surface of the seamless steel pipe substrate 1, and a layer of epoxy coal tar cold wrapping tape 9 is wrapped around the outside of the epoxy powder coating 10. A layer of asphalt anti-corrosion layer 2 is applied on the surface of the epoxy coal tar cold wrapping tape 9. This design solves the problem that the existing seamless steel pipe is prone to corrosion perforation in a strong corrosive environment, resulting in leakage accidents, which not only affects production safety but also increases maintenance costs.
[0025] The surface of the asphalt anti-corrosion layer 2 is provided with wear-resistant steel wire 3, which is in a spiral winding structure. The wear-resistant steel wire 3 can form an additional protective layer on the surface of the asphalt anti-corrosion layer 2, which can effectively resist the wear of the external environment and prevent the asphalt anti-corrosion layer 2 from being worn due to friction with the ground during paving, thereby ensuring the anti-corrosion effect of the asphalt anti-corrosion layer 2.
[0026] In this embodiment, the first anti-corrosion coating 11 is a nickel-based alloy layer with a coating thickness of 0.2-0.5 mm. The nickel-based alloy has excellent corrosion resistance and can effectively resist erosion by various corrosive media, thereby protecting the steel pipe substrate from damage.
[0027] In this embodiment, the second anti-corrosion coating 12 is a nano-ceramic coating with a coating thickness of 0.1-0.3 mm. The nano-ceramic coating has good corrosion resistance, wear resistance and high temperature resistance. As a second layer of protection, the nano-ceramic coating cooperates with the first anti-corrosion coating to form a double protective barrier, which not only further enhances the corrosion resistance of the seamless steel pipe, but also provides additional mechanical strength and wear resistance, enabling it to operate stably for a long time in a strong corrosive environment, providing reliable and lasting protection for chemical production.
[0028] As the second embodiment of the utility model:
[0029] like Figure 1 , 2 As shown in FIG. 4 , a joint pipe 4 is welded and fixed inside the front end of the seamless steel pipe substrate 1, and multiple groups of limit blocks 5 are fixed on the annular surface of the joint pipe 4, and a gap is left between the rear end of the limit block 5 and the front end of the seamless steel pipe substrate 1, and multiple groups of plug holes 6 are opened inside the front end surface of the seamless steel pipe substrate 1. The joint pipe 4 is provided to facilitate the rapid connection of adjacent seamless steel pipes during pipeline construction, ensuring the connection stability between seamless steel pipes.
[0030] In this embodiment, the inner wall of the rear port of the seamless steel pipe base 1 is evenly provided with multiple groups of limit slots 8 that match the limit block 5, and multiple groups of plug rods 7 are fixed on the rear end surface of the seamless steel pipe base 1, and the specifications of the plug rods 7 are compatible with the plug hole 6. This design can make the limit block 5 snap into the limit slot 8 when the pipeline is connected through multiple groups of limit slots 8, so as to realize the rapid connection and positioning between the seamless steel pipe bases 1, prevent it from deviating and affecting the subsequent welding work, and at the same time, multiple groups of plug rods 7 can be inserted into the plug hole 6, so as to further improve the connection stability between the seamless steel pipe bases 1.
[0031] In this embodiment, inclined grooves 13 are provided at the edges of the front port and the rear port of the seamless steel pipe substrate 1. The inclined groove 13 design makes it easier to connect the steel pipe during welding, and the welding material can be more evenly filled in the groove 13, thereby forming a more firm and sealed weld joint. At the same time, the groove 13 design increases the contact area of the connection of the seamless steel pipe substrate 1, thereby improving the connection strength and stability.
[0032] When connecting the pipelines, first fix one group of pipelines, then place the other group of pipelines at the front end thereof, insert the joint pipe 4 on the next group of seamless steel pipe substrates 1 into the previous group of seamless steel pipe substrates 1, and at the same time, insert the limiting card block 5 into the limiting card slot 8, and quickly connect and position the two groups of pipelines through the limiting card block 5 and the limiting card slot 8, and then insert the plug rod 7 into the plug hole 6 accordingly, and then weld the connection between the two groups of pipelines to achieve docking of the two groups of pipelines.
[0033] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made on the basis of the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.
Claims
1. A corrosion-resistant seamless steel pipe for chemical industry, comprising a seamless steel pipe substrate (1) and a first anti-corrosion coating (11), characterized in that: The inner surface of the seamless steel pipe substrate (1) is sprayed with a first anti-corrosion coating (11), the outer side of the first anti-corrosion coating (11) is sprayed with a second anti-corrosion coating (12), the outer surface of the seamless steel pipe substrate (1) is provided with an epoxy powder coating (10), the outer side of the epoxy powder coating (10) is wrapped with a layer of epoxy coal tar cold wrapping tape (9), and the surface of the epoxy coal tar cold wrapping tape (9) is coated with a layer of asphalt anti-corrosion layer (2).
2. The corrosion-resistant seamless steel pipe for chemical industry according to claim 1, characterized in that: A wear-resistant steel wire (3) is provided on the surface of the asphalt anti-corrosion layer (2), and the wear-resistant steel wire (3) is in a spirally wound structure.
3. The corrosion-resistant seamless steel pipe for chemical industry according to claim 1, characterized in that: The first anti-corrosion coating (11) is a nickel-based alloy layer, and the coating thickness is 0.2-0.5 mm.
4. The corrosion-resistant seamless steel pipe for chemical industry according to claim 1, characterized in that: The second anti-corrosion coating (12) is a nano-ceramic coating with a coating thickness of 0.1-0.3 mm.
5. The corrosion-resistant seamless steel pipe for chemical industry according to claim 1, characterized in that: A joint pipe (4) is welded and fixed inside the front end of the seamless steel pipe base (1), a plurality of groups of limit blocks (5) are fixedly arranged on the annular surface of the joint pipe (4), and a gap is left between the rear end of the limit blocks (5) and the front end of the seamless steel pipe base (1), and a plurality of groups of plug holes (6) are provided inside the front end surface of the seamless steel pipe base (1).
6. The corrosion-resistant seamless steel pipe for chemical industry according to claim 5, characterized in that: The inner wall of the rear port of the seamless steel tube base (1) is evenly provided with a plurality of groups of limit slots (8) matched with the limit blocks (5), and the rear end surface of the seamless steel tube base (1) is fixed with a plurality of groups of plug-in rods (7), the specifications of the plug-in rods (7) being matched with the plug-in holes (6).
7. The corrosion-resistant seamless steel pipe for chemical industry according to claim 6, characterized in that: The edges of the front and rear ports of the seamless steel pipe base (1) are both provided with inclined grooves (13).