Corrosion-resistant lining stainless steel composite pipe and manufacturing method thereof

Abstract

The invention discloses a corrosion-resistant lining stainless steel composite pipe and a manufacturing method thereof.The corrosion-resistant lining stainless steel composite pipe comprises an outer-layer stainless steel pipe, a carbon structural steel pipe is arranged in the outer-layer stainless steel pipe, a lining stainless steel pipe is arranged in the carbon structural steel pipe, and an outer limiting clamping ring is fixedly connected to the outer surface of the lining stainless steel pipe; an inner limiting groove ring is arranged in the carbon structural steel pipe and attached to the outer limiting clamping ring, a sealing covered edge is arranged between the end of the outer-layer stainless steel pipe and the end of the lining stainless steel pipe, and the sealing covered edge and the outer-layer stainless steel pipe are integrally arranged. According to the invention, through the arrangement of the outer limiting clamping ring, the connection strength with the carbon structural steel pipe is increased, so that the probability of falling between the lining stainless steel pipe and the carbon structural steel pipe can be reduced, the use stability is ensured, through the arrangement of the sealing wrapping edge and the lining stainless steel pipe, the carbon structural steel pipe is completely wrapped, the corrosion resistance can be ensured, and the service life of the carbon structural steel pipe is prolonged. The service life is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel composite pipes, in particular to a corrosion-resistant lined stainless steel composite pipe and a manufacturing method thereof. Background Art

[0002] Stainless steel composite pipe is a new material made of stainless steel and carbon structural steel by non-destructive pressure synchronous compounding. It has the corrosion resistance, wear resistance and excellent appearance of stainless steel, as well as the good bending strength and impact resistance of carbon steel.

[0003] In the prior art, stainless steel composite pipes are mostly formed by compounding two layers of metal materials. In order to ensure the internal corrosion resistance, a corrosion-resistant coating is usually applied to the inner carbon structural steel layer for use. This method has poor stability. After long-term use, the inner carbon structural steel layer will still be corroded. It has low practicality and is prone to damage. Summary of the invention

[0004] The purpose of the present invention is to provide a corrosion-resistant lined stainless steel composite pipe and a manufacturing method thereof, so as to solve the problem that the stainless steel composite pipe proposed in the above background technology is mostly formed by compounding two layers of metal materials, and in order to ensure the internal corrosion resistance, the inner carbon structural steel layer is mostly coated with a corrosion-resistant coating for use. This method has poor stability. After long-term use, the inner carbon structural steel layer will still be corroded, and the practicality is low and it is easy to be damaged.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a corrosion-resistant lined stainless steel composite pipe, comprising an outer stainless steel pipe, a carbon structural steel pipe is arranged inside the outer stainless steel pipe, an inner lined stainless steel pipe is arranged inside the carbon structural steel pipe, an outer limit clamping ring is fixedly connected to the outer surface of the inner lined stainless steel pipe, an inner limit groove ring is opened inside the carbon structural steel pipe, the inner limit groove ring is fitted with the outer limit clamping ring, a sealing edging is arranged between the end of the outer stainless steel pipe and the end of the inner lined stainless steel pipe, and the sealing edging is integrated with the outer stainless steel pipe.

[0006] Preferably, the thickness of the inner lining stainless steel tube is greater than the thickness of the outer stainless steel tube.

[0007] A method for manufacturing a corrosion-resistant lined stainless steel composite pipe comprises the following steps:

[0008] S1. Preparation of blank pipe: Use the pipe welding unit to prepare the outer stainless steel pipe, and use the carbon structural steel pipe and stainless steel pipe to prepare the blank carbon structural steel pipe and the lined stainless steel pipe respectively;

[0009] S2. Inner tube forming: the carbon structural steel pipe is heated, and then the inner lining stainless steel pipe is sleeved inside the carbon structural steel pipe, multiple groups of rollers are used to roll the surface of the carbon structural steel pipe, and a solid roller is inserted into the inner lining stainless steel pipe to restrict the inner ring surface of the inner lining stainless steel pipe. The extrusion roller outside the carbon structural steel pipe gradually squeezes the surface of the carbon structural steel pipe, so that the inner ring surface of the carbon structural steel pipe fits the outer ring surface of the inner lining stainless steel pipe, until the inner ring surface of the carbon structural steel pipe is squeezed by the outer limit clamp ring to form an inner limit groove ring, thereby completely restricting the carbon structural steel pipe inside the carbon structural steel pipe, and compounding the inner lining stainless steel pipe with the carbon structural steel pipe;

[0010] S3, chuck making: a two-cylinder hydraulic ram machine is used, and a hydraulic cylinder is used to drive four slide blocks that cooperate with each other to slide and squeeze the pipe in the frame to reduce the diameter and make the chuck. The reduced diameter part is a solid square. A three-cylinder hydraulic ram machine is used, and a pair of molds are used to achieve compression. The reduced diameter part is a solid 8-shaped part that is approximately circular. In this way, the end of the outer stainless steel pipe and the end of the composite lining stainless steel pipe and carbon structural steel pipe are made into a chuck;

[0011] S4, placing the composited carbon structural steel pipe, the inner lining stainless steel pipe and the outer stainless steel pipe in a drawing machine, and composite the outer stainless steel pipe, the carbon structural steel pipe and the inner lining stainless steel pipe through a mold;

[0012] S5. Edge sealing: Use a roller press to squeeze the end of the outer stainless steel tube, fill the inner ring surface of the lining stainless steel tube with a roller, and fit it to the surface of the lining stainless steel tube. Bend the end of the sealed edge and gradually contact it with the outer surface of the lining stainless steel tube. By continuously applying pressure, squeeze and fit the end of the outer stainless steel tube with the end of the lining stainless steel tube. Use an electric welder to weld and seal the interface area of ​​the end of the outer stainless steel tube and the end of the lining stainless steel tube.

[0013] S6. Use a cutting machine to cut off the excess parts of the ends of the outer stainless steel pipe and the inner lining stainless steel pipe;

[0014] S7, grinding the end of the finished composite pipe to ensure the flatness of the end, and then using a polishing machine to polish the outer annular surface of the outer stainless steel pipe and the inner annular surface of the lining stainless steel pipe;

[0015] S8, composite pipe cleaning;

[0016] S9. Stress relief.

[0017] Preferably, in step S1, the outer stainless steel tube is welded into a tube by means of welding from stainless steel strips.

[0018] Preferably, in step S1, the steps of making the rough carbon structural steel pipe and the lined stainless steel pipe are:

[0019] Use a die to insert the carbon structural steel pipe and the lined stainless steel pipe, use a drawing device to increase the inner diameter of the carbon structural steel pipe and the lined stainless steel pipe, use a roller press to insert a solid rod into the lined stainless steel pipe, and then apply force from the outside to extrude the outer surface of the lined stainless steel pipe to form an outer limit clamp on the surface of the lined stainless steel pipe.

[0020] Preferably, in step S1, the length of the prepared outer stainless steel pipe and the inner lining stainless steel pipe is equal to that of the carbon structural steel pipe, and is greater than that of the carbon structural steel pipe.

[0021] Preferably, in step S1, during the drawing process of the rough carbon structural steel pipe and the lined stainless steel pipe, lubricating oil needs to be applied to the inside thereof. After the drawing is completed, the lubricating oil in the carbon structural steel pipe and the lined stainless steel pipe is cleaned and removed using cleaning equipment, and then the cleaning liquid is flushed out by high-pressure airflow, while the carbon structural steel pipe and the lined stainless steel pipe are dried.

[0022] Preferably, in step S8, the specific steps of cleaning the composite tube are:

[0023] S81, placing the processed composite pipe in a cleaning machine to clean the metal powder and lubricating oil generated by polishing;

[0024] S82, placing the preliminarily cleaned composite pipe in an air dryer, using a high-pressure airflow to flush out the cleaning liquid on the inner and outer surfaces of the composite pipe, and drying the surface at the same time;

[0025] S83. Place the felt at one end of the lined stainless steel tube and ensure that the felt fits tightly against the inner wall of the lined stainless steel tube. Then drip cleaning liquid onto the felt and flush the felt out with high-pressure gas. In this way, the inner wall of the lined stainless steel tube is wiped clean by the felt and the cleaning liquid to complete the cleaning.

[0026] Preferably, in step S9, the specific steps of eliminating stress are:

[0027] S91. Place the cleaned composite tube on the transmission belt of the high-temperature furnace, and use a steel wire to limit the position of the composite tube;

[0028] S92. After the composite pipe is cooled, place the composite pipe in a straightening machine to eliminate stress and ensure the straightness of the composite pipe.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] In the present invention, by setting an external limit clamp ring, the connection strength between the carbon structural steel pipe is increased, thereby reducing the probability of detachment between the inner lining stainless steel pipe and the carbon structural steel pipe, ensuring the stability of use, and by setting the sealing edge and the inner lining stainless steel pipe, the carbon structural steel pipe is completely wrapped, which can ensure corrosion resistance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the three-dimensional structure of a corrosion-resistant lined stainless steel composite pipe of the present invention;

[0032] Figure 2 This is a schematic diagram of the internal structure of a corrosion-resistant lined stainless steel composite pipe of the present invention;

[0033] Figure 3 The exploded view of the corrosion-resistant lined stainless steel composite pipe of the present invention.

[0034] In the figure:

[0035] 1. Outer stainless steel tube; 2. Inner lining stainless steel tube; 3. Sealing and edging; 4. Carbon structural steel tube; 5. Inner limit groove ring; 6. Outer limit clamp ring. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Reference Figure 1 - Figure 3 As shown: a corrosion-resistant lined stainless steel composite pipe, including an outer stainless steel pipe 1, a carbon structural steel pipe 4 is arranged inside the outer stainless steel pipe 1, an inner lined stainless steel pipe 2 is arranged inside the carbon structural steel pipe 4, an outer limit clamp ring 6 is fixedly connected to the outer surface of the inner lined stainless steel pipe 2, an inner limit groove ring 5 is opened inside the carbon structural steel pipe 4, the inner limit groove ring 5 is fitted with the outer limit clamp ring 6, a sealing edge 3 is arranged between the end of the outer stainless steel pipe 1 and the end of the inner lined stainless steel pipe 2, the sealing edge 3 and the outer stainless steel pipe 1 are integrated, and the thickness of the inner lined stainless steel pipe 2 is greater than the thickness of the outer stainless steel pipe 1.

[0038] In the present invention, by setting the outer limit clamp 6, the connection strength between the carbon structural steel pipe 4 is increased, thereby reducing the probability of the inner lining stainless steel pipe 2 and the carbon structural steel pipe 4 falling off, ensuring the stability of use, and by setting the sealing edge 3 and the inner lining stainless steel pipe 2, the carbon structural steel pipe 4 is completely wrapped, which can ensure corrosion resistance and service life.

[0039] Embodiment 2: A method for manufacturing a corrosion-resistant lined stainless steel composite pipe, comprising the following steps:

[0040] Step 1, preparation of blank pipe: use stainless steel belt and welding pipe unit to prepare outer stainless steel pipe 1, use carbon structural steel pipe and stainless steel pipe to prepare blank carbon structural steel pipe 4 and lined stainless steel pipe 2 respectively, the steps are: use mold to insert carbon structural steel pipe 4 and lined stainless steel pipe 2, use drawing equipment to increase the inner diameter of carbon structural steel pipe 4 and lined stainless steel pipe 2, use roller press to insert solid rod into lined stainless steel pipe 2, and then apply force from the outside to extrude the outer surface of lined stainless steel pipe 2, so that An outer limit clamp ring 6 is formed on the surface of the inner lining stainless steel tube 2. The length of the prepared blank outer stainless steel tube 1 is equal to that of the inner lining stainless steel tube 2, and is greater than that of the carbon structural steel tube 4. During the drawing process of the blank carbon structural steel tube 4 and the inner lining stainless steel tube 2, lubricating oil needs to be applied inside. After the drawing is completed, the lubricating oil in the carbon structural steel tube 4 and the inner lining stainless steel tube 2 is cleaned and removed using cleaning equipment, and then the cleaning liquid is flushed out by high-pressure airflow, and the carbon structural steel tube 4 and the inner lining stainless steel tube 2 are dried at the same time.

[0041] Step 2, inner tube forming: heat the carbon structural steel tube 4, then put the lined stainless steel tube 2 into the carbon structural steel tube 4, use multiple groups of rollers to roll the surface of the carbon structural steel tube 4, use a solid roller to insert into the lined stainless steel tube 2, limit the inner ring surface of the lined stainless steel tube 2, and the extrusion roller outside the carbon structural steel tube 4 gradually squeezes the surface of the carbon structural steel tube 4, so that the inner ring surface of the carbon structural steel tube 4 fits the outer ring surface of the lined stainless steel tube 2, until the inner ring surface of the carbon structural steel tube 4 is squeezed by the outer limit clamp ring 6 to form an inner limit groove ring 5, thereby completely limiting the carbon structural steel tube 4 inside the carbon structural steel tube 4, and compounding the lined stainless steel tube 2 and the carbon structural steel tube 4 together;

[0042] Step 3, making the chuck: select a two-cylinder hydraulic ram machine, use a hydraulic cylinder to drive four mutually cooperating slide blocks to slide and extrude the pipe in the frame to reduce the diameter and make the chuck. The reduced diameter part is a solid square. Select a three-cylinder hydraulic ram machine, use a pair of molds in the upper, lower, left and right to achieve compression, and the reduced diameter part is a solid 8-shaped that is approximately circular. In this way, the end of the outer stainless steel pipe 1 and the end of the composite lining stainless steel pipe 2 and the carbon structural steel pipe 4 are made into a chuck;

[0043] Step 4: Place the composited carbon structural steel pipe 4, the inner lining stainless steel pipe 2 and the outer stainless steel pipe 1 in a drawing machine, and composite the outer stainless steel pipe 1, the carbon structural steel pipe 4 and the inner lining stainless steel pipe 2 through a mold;

[0044] Step 5, edge sealing: use a roller press to extrude the end of the outer stainless steel tube 1, fill the inner annular surface of the lining stainless steel tube 2 with a roller, and fit it to the surface of the lining stainless steel tube 2, bend the end of the sealing edge 3, and gradually contact it with the outer surface of the lining stainless steel tube 2, and extrude and fit the end of the outer stainless steel tube 1 and the end of the lining stainless steel tube 2 by continuous pressure, and use an electric welder to weld and seal the end interface area of ​​the outer stainless steel tube 1 and the inner lining stainless steel tube 2;

[0045] Step 6: Use a cutting machine to cut off the excess parts of the ends of the outer stainless steel tube 1 and the inner lining stainless steel tube 2;

[0046] Step 7: Grind the end of the finished composite pipe to ensure the flatness of the end, and then use a polishing machine to polish the outer annular surface of the outer stainless steel pipe 1 and the inner annular surface of the lining stainless steel pipe 2;

[0047] Step 8, cleaning of composite pipe: place the processed composite pipe in a cleaning machine, clean the metal powder and lubricating oil produced by polishing; then place the composite pipe that has been preliminarily cleaned in an air dryer, use high-pressure airflow to flush out the cleaning liquid on the inner and outer surfaces of the composite pipe, and dry the surface at the same time; finally, place the felt at one end of the lined stainless steel pipe 2, and ensure that the felt is in close contact with the inner wall of the lined stainless steel pipe 2, then drip the cleaning liquid onto the felt, flush the felt with the high-pressure gas, and thus, wipe the inner wall of the lined stainless steel pipe 2 clean with the felt and the cleaning liquid, and the cleaning is completed;

[0048] Step 9: Stress elimination: Place the cleaned composite pipe on the transmission belt of the high-temperature furnace, and use steel wire to limit the position of the composite pipe. After the composite pipe cools down, place the composite pipe in a straightening machine to eliminate stress and ensure the straightness of the composite pipe.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A corrosion-resistant lined stainless steel composite pipe, characterized in that: The invention comprises an outer stainless steel tube (1), wherein a carbon structural steel tube (4) is arranged inside the outer stainless steel tube (1), wherein an inner lining stainless steel tube (2) is arranged inside the carbon structural steel tube (4), an outer limit clamping ring (6) is fixedly connected to the outer surface of the inner lining stainless steel tube (2), an inner limit groove ring (5) is provided inside the carbon structural steel tube (4), the inner limit groove ring (5) is fitted with the outer limit clamping ring (6), a sealing edge (3) is arranged between the end of the outer stainless steel tube (1) and the end of the inner lining stainless steel tube (2), and the sealing edge (3) and the outer stainless steel tube (1) are arranged as a whole.

2. The corrosion-resistant lined stainless steel composite pipe according to claim 1, characterized in that: The thickness of the inner lining stainless steel tube (2) is greater than the thickness of the outer stainless steel tube (1).

3. A method for manufacturing a corrosion-resistant lined stainless steel composite pipe, characterized in that: The corrosion-resistant lined stainless steel composite pipe according to claim 2 is used, comprising the following steps: S1. Preparation of blank pipes: using a pipe welding unit to prepare an outer stainless steel pipe (1), and using a carbon structural steel pipe and a stainless steel pipe to prepare a blank carbon structural steel pipe (4) and a lined stainless steel pipe (2) respectively; S2, inner tube forming: the carbon structural steel tube (4) is heated, and then the inner lining stainless steel tube (2) is sleeved inside the carbon structural steel tube (4), and multiple groups of rollers are used to roll the surface of the carbon structural steel tube (4), and a solid roller is inserted into the inner lining stainless steel tube (2) to restrict the inner ring surface of the inner lining stainless steel tube (2). The squeezing roller outside the carbon structural steel tube (4) gradually squeezes the surface of the carbon structural steel tube (4) so ​​that the inner ring surface of the carbon structural steel tube (4) fits the outer ring surface of the inner lining stainless steel tube (2) until the inner ring surface of the carbon structural steel tube (4) is squeezed by the outer limiting clamp ring (6) to form an inner limiting groove ring (5), thereby completely restricting the carbon structural steel tube (4) inside the carbon structural steel tube (4), and the inner lining stainless steel tube (2) and the carbon structural steel tube (4) are compounded together; S3, making chuck: using a two-cylinder hydraulic ram machine, using a hydraulic cylinder to drive four slide blocks that cooperate with each other to slide and squeeze the pipe in the frame to reduce the diameter and make the chuck, the reduced diameter part is a solid square, using a three-cylinder hydraulic ram machine, using a pair of molds on the upper, lower, left and right sides to achieve compression, the reduced diameter part is a solid 8-shaped approximately circular, in this way, the end of the outer stainless steel pipe (1) and the end of the composite lining stainless steel pipe (2) and the carbon structural steel pipe (4) are made into a chuck; S4, placing the composited carbon structural steel pipe (4), the inner lining stainless steel pipe (2) and the outer stainless steel pipe (1) in a drawing machine, and composite the outer stainless steel pipe (1), the carbon structural steel pipe (4) and the inner lining stainless steel pipe (2) through a mold; S5, edge sealing: using a roller press to squeeze the end of the outer stainless steel tube (1), the inner annular surface of the inner lining stainless steel tube (2) is filled with a roller to fit the surface of the inner lining stainless steel tube (2), the end of the sealing edge (3) is bent and gradually brought into contact with the outer surface of the inner lining stainless steel tube (2), and the end of the outer stainless steel tube (1) and the end of the inner lining stainless steel tube (2) are squeezed and fitted by continuous pressure, and an electric welder is used to weld and seal the interface area of ​​the end of the outer stainless steel tube (1) and the end of the inner lining stainless steel tube (2); S6. Using a cutting machine to cut off the excess parts of the ends of the outer stainless steel tube (1) and the inner lining stainless steel tube (2); S7, grinding the ends of the finished composite pipe to ensure the flatness of the ends, and then using a polishing machine to polish the outer annular surface of the outer stainless steel pipe (1) and the inner annular surface of the lining stainless steel pipe (2); S8, composite pipe cleaning; S9. Stress relief.

4. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 3, characterized in that: In step S1, the outer stainless steel tube (1) is welded into a tube by welding a stainless steel strip.

5. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 3, characterized in that: In step S1, the steps of manufacturing the rough carbon structural steel pipe (4) and the lined stainless steel pipe (2) are as follows: A die is used to insert the carbon structural steel pipe (4) and the lined stainless steel pipe (2), and a drawing device is used to increase the inner diameters of the carbon structural steel pipe (4) and the lined stainless steel pipe (2). A roller press is used to insert a solid rod into the lined stainless steel pipe (2), and then force is applied from the outside to extrude the outer surface of the lined stainless steel pipe (2), so that an outer limit clamping ring (6) is formed on the surface of the lined stainless steel pipe (2).

6. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 5, characterized in that: In step S1, the lengths of the prepared outer stainless steel tube (1) and the inner stainless steel tube (2) are equal and greater than the length of the carbon structural steel tube (4).

7. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 6, characterized in that: In step S1, during the drawing process of the rough carbon structural steel pipe (4) and the lined stainless steel pipe (2), lubricating oil needs to be applied to the inside thereof. After the drawing is completed, the lubricating oil in the carbon structural steel pipe (4) and the lined stainless steel pipe (2) is cleaned and removed using a cleaning device, and the cleaning liquid is then flushed out by a high-pressure airflow, while the carbon structural steel pipe (4) and the lined stainless steel pipe (2) are dried.

8. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 3, characterized in that: In step S8, the specific steps of cleaning the composite tube are: S81, placing the processed composite pipe in a cleaning machine to clean the metal powder and lubricating oil generated by polishing; S82, placing the preliminarily cleaned composite pipe in an air dryer, using a high-pressure airflow to flush out the cleaning liquid on the inner and outer surfaces of the composite pipe, and drying the surface at the same time; S83. Place a felt on one end of the lined stainless steel tube (2), and ensure that the felt is in close contact with the inner wall of the lined stainless steel tube (2). Then drip cleaning liquid onto the felt, and flush the felt out with high-pressure gas. In this way, the inner wall of the lined stainless steel tube (2) is wiped clean by the felt and the cleaning liquid, and the cleaning is completed.

9. The method for manufacturing a corrosion-resistant lined stainless steel composite pipe according to claim 3, characterized in that: In step S9, the specific steps of eliminating stress are: S91. Place the cleaned composite tube on the transmission belt of the high-temperature furnace, and use a steel wire to limit the position of the composite tube; S92. After the composite pipe is cooled, place the composite pipe in a straightening machine to eliminate stress and ensure the straightness of the composite pipe.

Images