High-toughness stainless steel pipe

Abstract

The invention relates to the technical field of steel pipes, in particular to a high-toughness stainless steel pipe which comprises an outer pipe body, the outer pipe body is filled with an inner pipe fitting, the pipe diameter of the inner pipe fitting is smaller than the diameter of a pipe cavity of the outer pipe body, a filler space is formed between the inner pipe fitting and the pipe cavity of the outer pipe body, and the filler space is filled with a composite layer. The composite layer comprises a round spring ring, the spring ring is a wave ring provided with inner and outer protrusions, the inner protrusions of the spring ring elastically abut against the pipe wall of the inner pipe fitting, the outer protrusions of the spring ring elastically abut against the cavity wall of the outer pipe fitting, and the inner protrusions and the outer protrusions on the spring ring are evenly arranged according to the annular shape of the spring ring. When the four pipe fitting units are heated to martensite through the heating rods, the strength and toughness of the four pipe fitting units can be improved, the four pipe fitting units serve as inner-layer pipes of the outer pipe body, the outer pipe body is assisted to be applied to a supporting occasion, and the supporting strength of the whole pipe fitting can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe sampling, in particular to a strong and tough stainless steel pipe. Background Art

[0002] Stainless steel pipes are used in steel structures. When used as supports, they bear a large gravity. When used in lateral steel structures, they also bear shear forces. Therefore, in steel structure construction, the support strength and shear damage degree that can be carried are important criteria for measuring stainless steel pipes.

[0003] However, most stainless steel pipes are single-layer pipes, and heat treatment is required to improve their strength and toughness. The mechanical properties after high-temperature heating are only reflected on the single-layer pipe wall. When used as a support, the bending resistance is poor, especially when damaged by radial shear force, the destructive force cannot be reduced. Therefore, the heat treatment performance of existing stainless steel pipes needs to be further improved. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a strong and tough stainless steel pipe, including an outer pipe body, the outer pipe body is filled with an inner pipe fitting, the pipe diameter of the inner pipe fitting is smaller than the diameter of the tube cavity of the outer pipe body, and a filling space is formed between the inner pipe fitting and the tube cavity of the outer pipe body, the filling space is filled with a composite layer, the composite layer includes a circular spring ring, the spring ring is a wave ring with inner and outer protrusions, the inner protrusion of the spring ring elastically presses against the tube wall of the inner pipe fitting, the outer protrusion of the spring ring elastically presses against the cavity wall of the outer pipe body, the inner and outer protrusions on the spring ring are evenly arranged in the ring shape of the spring ring, the bottom end of the inner pipe fitting is fixed with a warping ring, the warping ring is circular, and the outer edge of the warping ring The inner tube is bent upward and locked on the tube wall of the outer tube body, the inner tube is composed of at least four tube units, the warping ring is composed of at least four warping ring units, and a corresponding warping ring unit is fixed to the bottom end of each tube unit, each adjacent two tube units are butt-jointed with each other, and each adjacent two warping ring units follow two tube units and are butt-jointed with each other. When the tube cavity of the inner tube is heated, the heat is transferred to the four tube units, so that the four tube units expand in the radial direction and separate from each other in the circumferential direction at the same time, and the heat expansion is transferred to the inner protrusion of the spring coil through the outer wall of the tube unit, so that the spring coil expands radially in the filler space.

[0005] As a further preferred embodiment, the composite layer also includes an expansion agent filled in the filler space, the expansion agent fills the filler space along the height direction, the spring coil is buried in the filler space by the expansion agent, and when the lumen of the inner pipe is heated, the heat is transferred to the filler space through the wall of the inner pipe, so that the expansion agent releases the expansion effect and applies the expansion effect to the spring coil, causing the spring coil to expand radially toward the lumen wall of the outer tube body.

[0006] As a further preferred embodiment, the outer tube body is provided with release holes, the release holes are arranged in a plurality of rows, the plurality of rows of release holes are evenly arranged along the length direction of the outer tube body, and the release holes are circular holes.

[0007] As a further preference, the outer side of each piece of the pipe unit corresponds to at least one row of release holes.

[0008] As a further preference, the composite layer also includes a mixture filled in the filler space by weight, and the mixture includes by weight C: 0.15%-0.35%, Si: 0.10%-0.60%, Mn: 1.00%-2.00%, Nb: 0.02%-0.07%, Al: 0.01%-0.06%, Ti: 0.02%-0.12%.

[0009] As further preferred, there are a plurality of spring coils, and the plurality of spring coils are buried in the mixture at equal distances along the length direction of the filler space.

[0010] As a further preferred embodiment, the four pipe fitting units are composed of two first pipe fitting units and two second pipe fitting units, and the two sides of the first pipe fitting unit are butt-jointed with the adjacent sides of the two second pipe fitting units, and the two sides of the first pipe fitting unit are provided with burrs butt-jointed with the adjacent sides of the two second pipe fitting units, and the burrs are L-shaped notches opened on the two sides of the first pipe fitting unit and composed of an outer clamping part and an inner extension part, and the burrs are butt-jointed with the adjacent sides of the second pipe fitting unit through the clamping part, and the extension part extends an arc length along the arc-shaped inner surface of the second pipe fitting unit in a seamless butt-jointed manner, and the first pipe fitting unit and the second pipe fitting unit move in the circumferential direction relative to the butt-jointed relationship of the burrs, and at the same time, the four warping ring units move synchronously with the first pipe fitting unit and the second pipe fitting unit in the circumferential direction.

[0011] As further preferred, the spring ring is made of flat steel, the spring ring is vertically arranged in the filler space with the thickness side of the flat steel being vertical, and is buried in the filler space by the expansion agent and the mixture.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. First, after the inner pipe is heated, its four-piece pipe unit expands radially, and the outer wall of the four-piece pipe unit is used to lock the composite layer in the packing space; second, when the four-piece pipe unit expands due to heat, it will expand radially, and the outer wall surface of the four-piece pipe unit provides pressure to the spring coil through the outer protrusion, forcing the spring coil to expand radially in the packing space and be further locked in the packing space; it can be seen that when the pipe is heat-treated, the inner pipe is used as the heat source starting position for heating, so that the four-piece pipe unit is subjected to radial thermal expansion movement, at this time the packing space becomes narrower, so that the composite layer and the spring coil are clamped in the packing space, and when the four-piece pipe unit is heated to martensite by the heating rod, its strength and toughness can be improved. The four-piece pipe unit is used as the inner layer of the outer pipe body, and is used in supporting occasions to assist the outer pipe body, which can improve the supporting strength of the entire pipe.

[0014] 2. The spring coil is sandwiched between the outer wall of the four-piece pipe unit and the inner wall of the outer tube body, which is equivalent to forming an elastic connection structure between the four-piece pipe unit and the outer tube body. When the outer part of the outer tube body is subjected to radial impact, the spring coil releases its elasticity and reduces the destructive force, and the outer tube body radially reduces vibration, thereby improving the ability of the outer tube body to resist bending and deformation. There are several spring coils, and several spring coils are buried in the mixture at equal distances along the length direction of the filler space, that is, these spring coils are buried at different length positions of the filler space through the mixture in an equidistant manner. When the outer wall of the outer tube body is subjected to radial impact force, these spring coils buffer at the same time and buffer and reduce the impact force. Since these spring coils are distributed at different positions of the filler space, when the outer tube body is hit, the ability to resist bending and deformation is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of a high-toughness stainless steel pipe provided in an embodiment of the present invention from a top view;

[0016] Figure 2 A schematic top view of a strong and tough stainless steel pipe provided in an embodiment of the present invention;

[0017] Figure 3 The strong and tough stainless steel pipe provided in the embodiment of the present invention is composed of Figure 2 The schematic diagram after A section is drawn;

[0018] Figure 4 The strong and tough stainless steel pipe provided in the embodiment of the present invention is composed of Figure 3 The enlarged schematic diagram of the B part is shown;

[0019] Figure 5 The strong and tough stainless steel pipe provided in the embodiment of the present invention is composed of Figure 1A schematic diagram of removing a first pipe unit is shown;

[0020] Figure 6 A schematic diagram of disassembly of a high-toughness stainless steel pipe provided in an embodiment of the present invention when the outer pipe body is removed and only the pipe fitting unit is retained;

[0021] Figure 7 This is a schematic diagram of only the outer tube body of the strong and tough stainless steel tube provided in an embodiment of the present invention.

[0022] In the figure: 1. outer tube body; 2. inner tube; 3. filler space; 4. composite layer; 5. spring coil; 6. warping ring; 7. tube unit; 71. first tube unit; 72. second tube unit; 73. burr; 74. clamping part; 75. extension part; 8. warping ring unit; 9. release hole. DETAILED DESCRIPTION

[0023] The above and other embodiments and advantages of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0024] In one embodiment, if Figure 1-Figure 7 As shown:

[0025] The present embodiment provides a strong and tough stainless steel pipe, including an outer tube body 1, which is filled with an inner tube fitting 2, the tube diameter of the inner tube fitting 2 is smaller than the tube cavity diameter of the outer tube body 1, and a filling space 3 is formed between the inner tube fitting 2 and the tube cavity of the outer tube body 1, and the filling space 3 is filled with a composite layer 4, and the composite layer 4 includes a circular spring ring 5, and the spring ring 5 is a wave ring with inner and outer protrusions. The inner protrusion of the spring ring 5 elastically presses on the tube wall of the inner tube fitting 2, and the outer protrusion of the spring ring 5 elastically presses on the cavity wall of the outer tube body 1, and the inner and outer protrusions on the spring ring 5 are evenly arranged in the ring shape of the spring ring 5, and a warping ring 6 is fixed at the bottom end of the inner tube fitting 2, and the warping ring 6 is circular, and the outer edge of the warping ring 6 is upward Bending and locking on the tube wall of the outer tube body 1, the inner tube 2 is composed of at least four tube units 7, and the warping ring 6 is composed of at least four warping ring units 8. A corresponding warping ring unit 8 is fixed to the bottom end of each tube unit 7, and each adjacent two tube units 7 are butt-jointed together, and each adjacent two warping ring units 8 follow the two tube units 7 and are butt-jointed together. When the tube cavity of the inner tube 2 is heated, the heat is transferred to the four tube units 7, so that the four tube units 7 expand in the radial direction and separate from each other in the circumferential direction, and the heat expansion is transferred to the inner protrusion of the spring coil 5 through the outer wall of the tube unit 7, so that the spring coil 5 expands radially in the packing space 3.

[0026] The composite layer 4 also includes an expansion agent filled in the filler space 3. The expansion agent fills the filler space 3 along the height direction. The spring coil 5 is buried in the filler space 3 by the expansion agent. When the lumen of the inner pipe 2 is heated, the heat is transferred to the filler space 3 through the wall of the inner pipe 2, so that the expansion agent releases the expansion effect and acts on the spring coil 5, so that the spring coil 5 expands radially toward the lumen wall of the outer tube body 1.

[0027] The composite layer 4 also includes a mixture filled in the filler space 3 by weight, and the mixture includes C: 0.15%-0.35%, Si: 0.10%-0.60%, Mn: 1.00%-2.00%, Nb: 0.02%-0.07%, Al: 0.01%-0.06%, Ti: 0.02%-0.12%.

[0028] Before the pipe fitting is used, it is heat-treated by a high-temperature heating rod, and the heating rod is inserted into the inner pipe fitting 2. When the inner pipe fitting 2 is heated, two actions will occur. First, after the inner pipe fitting 2 is heated, its four pipe fitting units 7 will expand radially (radial expansion), and the outer walls of the four pipe fitting units 7 will be used to lock the composite layer in the packing space 3; second, when the four pipe fitting units 7 are heated and expanded, they will expand radially, and the outer wall surface of the four pipe fitting units 7 will provide pressure to the spring coil 5 through the outer protrusion, forcing the spring coil 5 to radially expand in the packing space 3. Expanded, and further locked in the packing space 3; it can be seen that when the pipe is heat treated, the inner pipe 2 is used as the heat source starting position for heating, so that the four-piece pipe unit 7 radially expands and moves. At this time, the packing space 3 becomes narrower, so that the composite layer and the spring coil 5 are clamped in the packing space 3. When the four-piece pipe unit 7 is heated to martensite by the heating rod, its strength and toughness can be improved. The four-piece pipe unit 7 is used as the inner layer tube of the outer tube body 1, and is assisted by the outer tube body 1 in supporting occasions, which can improve the supporting strength of the entire pipe fitting. The composite layer 4 includes a mixture filled in the filler space 3 by weight, and the mixture includes but is not limited to C: 0.15%-0.35%, Si: 0.10%-0.60%, Mn: 1.00%-2.00%, Nb: 0.02%-0.07%, Al: 0.01%-0.06%, Ti: 0.02%-0.12%. When the inner pipe 2 is heated to martensite at high temperature, heat is transferred to these mixtures, and these mixtures exert mechanical properties. After annealing To further improve the strength and toughness of the pipe fitting, the spring coil 5 is sandwiched between the outer wall of the four-piece pipe fitting unit 7 and the inner wall of the outer tube body 1 (in the packing space 3), which is equivalent to forming an elastic connection structure between the four-piece pipe fitting unit 7 and the outer tube body 1. When the outer part of the outer tube body 1 is subjected to radial impact, the spring coil 5 releases its elasticity and reduces the destructive force, and the outer tube body 1 radially reduces vibration, thereby improving the ability of the outer tube body 1 to resist bending deformation. There are several spring coils 5, and the several spring coils 5 are arranged along the length direction of the packing space 3 ( Figure 1The spring coils 5 are buried in the mixture at equal distances (in the height direction) in the filling space 3, that is, the spring coils 5 are buried in the mixture at different length positions of the filling space 3 in an equidistant manner. When the outer wall of the outer tube body 1 is subjected to radial impact force, the spring coils 5 buffer and reduce the impact force at the same time. Since the spring coils 5 are distributed at different positions of the filling space 3, the outer tube body 1 has greatly improved anti-bending and anti-deformation capabilities when it is impacted.

[0029] like Figure 2 , Figure 5 As shown, the spring coil 5 is a wavy full-circle structure. Therefore, when the inner ring of the inner pipe 2 is heated and causes its four-piece pipe unit 7 to move radially, the movement force is transmitted to the spring coil 5 through the inner protrusion, and then transmitted to the outer tube body 1 by the outer protrusion on the spring coil 5. Even if the inner pipe 2 is deformed by heat treatment, the outer tube body 1 will not be deformed. The outer tube body 1 is an outer stainless tube with decorative properties. The heat-treated inner pipe 2 (four-piece pipe unit 7) is the inner core of the outer tube body 1 and can fully assist the outer tube body 1 in bearing loads. The spring coil 5 is made of flat steel. The spring coil 5 is vertically arranged in the packing space 3 in a manner that the thickness side of the flat steel is vertical, that is, the narrow side of the spring coil 5 is vertical downward, the outer wide surface is elastically contacted with the cavity wall of the outer tube body 1 by the outer protrusion, and the inner wide surface is elastically contacted with the four-piece pipe unit 7 by the inner protrusion. When the outer tube body 1 is impacted, the elastic area of ​​the spring coil 5 is increased, and the anti-bending and anti-deformation capabilities are further improved.

[0030] like Figure 1 , Figure 5 as well as Figure 7 As shown, the outer tube body 1 is provided with release holes 9, which are arranged in several rows and are evenly arranged along the length direction of the outer tube body 1. The release holes 9 are round holes, and each tube unit 7 has at least one row of release holes 9 on its outer side. When the heating rod enters the inner tube 2 (four tube units 7) for heat treatment, the tube unit 7 releases heat, which is transferred to the packing space 3 to heat the mixture in the packing space 3 and then released to the outside through the release holes 9.

[0031] like Figure 2 , Figure 6As shown, the four-piece pipe fitting unit 7 is composed of two first pipe fitting units 71 and two second pipe fitting units 72. The two sides of the first pipe fitting unit 71 are butted against the adjacent sides of the two second pipe fitting units 72, and the two sides of the first pipe fitting unit 71 are provided with burrs 73 butted against the adjacent sides of the two second pipe fitting units 72. The burrs 73 are L-shaped notches formed on the two sides of the first pipe fitting unit 71 and composed of an outer clamping portion 74 and an inner extension portion 75. The burrs 73 are butted against the adjacent sides of the second pipe fitting unit 72 through the clamping portion 74, and the extension portion 75 extends an arc length along the arc-shaped inner surface of the second pipe fitting unit 72 in a seamless butt-jointed manner. The first pipe unit 71 and the second pipe unit 72 move in the circumferential direction relative to the docking relationship of the flash 73, and at the same time, the four warping ring units 8 move synchronously with the first pipe unit 71 and the second pipe unit 72 in the circumferential direction. When the four pipe units 7 expand due to heat and move in the radial direction, they are still docked together by the extension part 75 and the clamping part 74. When the inner pipe 2 is heated, it not only ensures that the four pipe units 7 move effectively in four directions respectively, but also ensures that the two adjacent pipe units 7 are connected together, avoiding cracks at the docking points of the two pipe units 7, causing the mixture in the filler space 3 to flow into the inner pipe 2.

[0032] The above orientation designations do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the orientations are described relatively with reference to the figures. In essence, the specific orientations of the components are described according to their actual installation and actual use as well as the customary orientations of technicians in this field. This is hereby explained.

[0033] The specific implementation methods described above further describe the invention purpose, technical solutions, and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, 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. Strong and tough stainless steel pipe, characterized by: The invention comprises an outer tube body (1), wherein the inner tube body (1) is filled with an inner tube member (2), wherein the tube diameter of the inner tube member (2) is smaller than the tube cavity diameter of the outer tube body (1), and a filling space (3) is formed between the inner tube member (2) and the tube cavity of the outer tube body (1), wherein the filling space (3) is filled with a composite layer (4), wherein the composite layer (4) comprises a circular spring ring (5), wherein the spring ring (5) is a wave ring provided with inner and outer protrusions, wherein the inner protrusion of the spring ring (5) elastically presses against the tube wall of the inner tube member (2), and the outer protrusion of the spring ring (5) elastically presses against the cavity wall of the outer tube body (1), wherein the inner and outer protrusions on the spring ring (5) are evenly arranged in the shape of the spring ring (5), and a warping ring (6) is fixed at the bottom end of the inner tube member (2), wherein the warping ring (6) is circular, and the outer edge of the warping ring (6) is bent upwards and locked on the tube wall of the outer tube body (1); the inner tube (2) is composed of at least four tube units (7); the warping ring (6) is composed of at least four warping ring units (8); a corresponding warping ring unit (8) is fixed to the bottom end of each tube unit (7); each adjacent two tube units (7) are butt-jointed with each other; each adjacent two warping ring units (8) follow two tube units (7) to butt-join with each other; when the tube cavity of the inner tube (2) is heated, the heat is transferred to the four tube units (7), so that the four tube units (7) expand in the radial direction and separate in the circumferential direction at the same time, and the heat expansion is transferred to the inner protrusion of the spring ring (5) through the outer wall of the tube unit (7), so that the spring ring (5) expands radially in the packing space (3).

2. The strong and tough stainless steel pipe according to claim 1, characterized in that: The composite layer (4) further comprises an expansion agent filled in the filler space (3), the expansion agent filling the filler space (3) along the height direction, the spring coil (5) being buried in the filler space (3) by the expansion agent, and when the lumen of the inner tube (2) is heated, the heat is transferred to the filler space (3) through the wall of the inner tube (2), so that the expansion agent releases the expansion effect, and the expansion effect acts on the spring coil (5), so that the spring coil (5) expands radially toward the lumen wall of the outer tube body (1).

3. The strong and tough stainless steel pipe according to claim 1, characterized in that: The outer tube body (1) is provided with release holes (9), the release holes (9) are arranged in a plurality of rows, the plurality of rows of release holes (9) are evenly arranged along the length direction of the outer tube body (1), and the release holes (9) are circular holes.

4. The strong and tough stainless steel pipe according to claim 1, characterized in that: The outer side of each pipe unit (7) corresponds to at least one row of release holes (9).

5. The strong and tough stainless steel pipe according to claim 1, characterized in that: The composite layer (4) further comprises a mixture filled in the filler space (3) by weight, wherein the mixture comprises, by weight, C: 0.15%-0.35%, Si: 0.10%-0.60%, Mn: 1.00%-2.00%, Nb: 0.02%-0.07%, Al: 0.01%-0.06%, and Ti: 0.02%-0.12%.

6. The strong and tough stainless steel pipe according to claim 2, characterized in that: There are a plurality of spring coils (5), and the plurality of spring coils (5) are buried in the mixture at equal distances along the length direction of the filler space (3).

7. The strong and tough stainless steel pipe according to claim 3, characterized in that: The four-piece pipe unit (7) is composed of two first pipe units (71) and two second pipe units (72), the two sides of the first pipe unit (71) are butted with the adjacent sides of the two second pipe units (72), and the two sides of the first pipe unit (71) are provided with burrs (73) butted with the adjacent sides of the two second pipe units (72), the burrs (73) are L-shaped notches formed on the two sides of the first pipe unit (71) and composed of an outer clamping portion (74) and an inner extension portion (75). The flash (73) is butted against the adjacent edge of the second pipe unit (72) through the clamping portion (74), and the extension portion (75) extends an arc length along the arc-shaped inner surface of the second pipe unit (72) in a seamless butt-jointed manner. The first pipe unit (71) and the second pipe unit (72) move in a circumferential direction relative to the butt-jointed relationship of the flash (73), and at the same time, the warping ring units (8) at four locations move synchronously with the first pipe unit (71) and the second pipe unit (72) in the circumferential direction.

8. The strong and tough stainless steel pipe according to claim 6, characterized in that: The spring ring (5) is made of flat steel, and the spring ring (5) is vertically arranged in the filler space (3) with the thickness side of the flat steel being vertical, and is buried in the filler space (3) by the expansion agent and the mixture.

Images