CN113202982A

CN113202982A - Precise seamless stainless steel pipe for hydraulic system pipeline, production process and connecting structure

Info

Publication number: CN113202982A
Application number: CN202110507909.6A
Authority: CN
Inventors: 张培丽; 赵江山; 陈强
Original assignee: Shanghai Fengxian Steel Tube Factory Co ltd
Current assignee: Shanghai Fengxian Steel Tube Factory Co ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2021-08-03
Anticipated expiration: 2041-05-10
Also published as: CN113202982B

Abstract

The utility model relates to a hydraulic system is accurate seamless nonrust steel pipe, production technology and connection structure for pipeline, it includes the pipeline main part, the one end or both ends opening border of pipeline main part are provided with the flange subassembly, the flange subassembly includes flange one and flange two, flange one is turned over outwards by the opening border that the pipeline main part is right and is formed, flange two turns over towards pipeline main part center by flange outer lane border and turns over the formation, flange one turns over an angle and is alpha, 90 > alpha > 45, flange one turns over an angle and be beta, 45 > beta > 0. The application can adapt to the connection of a flange system.

Description

Precise seamless stainless steel pipe for hydraulic system pipeline, production process and connecting structure

Technical Field

The application relates to the field of steel pipes, in particular to a precise seamless stainless steel pipe for a hydraulic system pipeline, a production process and a connection structure.

Background

Seamless steel pipes are steel pipes made of one piece of metal, with no seams on the surface. The seamless steel pipe has the advantages of high pressure resistance, good toughness, long pipe section and few joints, and is widely applied to hydraulic system pipelines.

For the pipeline construction project of the existing marine oil regulating system, when the specification of a system pipeline is below DN32, a design department usually only provides a pipeline interface schematic diagram and does not provide a pipeline layout diagram. However, the existing marine oil regulating system pipeline construction adopts a mode of firstly bending a steel pipe and then welding the steel pipe on site, so that links of manually measuring and marking the length of the steel pipe on site are added, and the construction precision is poor and the efficiency is low.

In the prior art, application number CN201811114446.1 discloses a steel pipe for hydraulic line, and its technical essential is: including the steel pipe body, the steel pipe body is provided with the scale mark that is used for instructing its length.

In view of the above-mentioned related technologies, the inventor believes that in the existing hydraulic pipeline installation, a non-welded flange system connection is often adopted, and the pipeline installation cannot be applied to the flange system connection.

Disclosure of Invention

In order to adapt to the connection mode of a flange system, the application provides a precise seamless stainless steel pipe for a hydraulic system pipeline, a production process and a connection structure.

The application provides a precision seamless stainless steel pipe, production technology and connection structure for hydraulic system pipeline, adopts following technical scheme:

first aspect, the application provides a nonrust steel pipe of accurate seamless for hydraulic system pipeline, including the pipeline main part, the one end or both ends opening border of pipeline main part are provided with the flange subassembly, the flange subassembly includes flange one and flange two, flange one is turned over outwards by the opening border that the pipeline main part is right and is formed, flange two turns over towards the pipeline main part center by a flange outer lane border and turns over a formation, flange one turns over an angle and is alpha, 90 > alpha > 45, flange one turns over an angle and is beta, 45 > beta > 0.

By adopting the technical scheme, the flange assembly can be adapted to a flange connecting system for connection, and meanwhile, as the angle is more than 90 degrees and more than 45 degrees and more than beta and more than 0 degree, the external force born by the flange assembly can be dispersed to different directions after connection, and the connection stability is optimized.

In a second aspect, the present application provides a process for producing a precision seamless stainless steel tube, comprising the steps of:

and (3) blank inspection: removing oxidized iron scales on the surface of the tube blank, checking whether the surface layer of the tube blank has defects such as cracks and the like, and cleaning the detected micro defects;

feeding and finish rolling: feeding the qualified pipe blank and finish rolling the pipe blank into a pipeline main body;

and (3) heat treatment: performing bright heat treatment on the pipeline main body;

straightening: straightening the pipeline main body, and welding a first connecting flange in the flange assembly to one end of the pipeline main body after straightening;

nondestructive flaw detection: performing nondestructive inspection on the pipeline main body and the flange assembly, and checking whether structural defects exist;

and (3) finishing: and finishing the pipeline main body and the flange assembly, and polishing burrs and surfaces of the pipeline main body and the flange assembly.

The third aspect, the application provides a connection structure, including connecting ring platform and two fasteners, two border chamfers that the center was kept away from to the connecting ring platform are formed with faying surface one, the fastener including be pipy connecting portion and with the same central axis's of connecting portion fastening ring platform, the internal diameter of fastening ring platform is less than the internal diameter of connecting portion, the connecting portion inner circle border chamfer of fastening ring platform orientation connection is formed with faying surface two, faying surface one and faying surface two all adapt to in the flange subassembly, the flange subassembly all is by the centre gripping between faying surface one and faying surface two, two the equal overcoat of fastening ring platform and threaded connection in connecting ring platform.

Through adopting above-mentioned technical scheme, when connecting two adjacent pipelines, only need to rotate connecting portion and drive the fastening ring platform and move towards the connecting ring platform, make fastening ring platform butt in the flange subassembly, and with flange subassembly centre gripping between faying face one and faying face two, with can dismantle two adjacent pipeline main parts and connect, when the installation is relatively more convenient, still can not produce destruction to flange subassembly and pipeline main part itself, simultaneously when sealed effect descends, only need change connecting ring platform or fastener can.

Optionally, two the connecting pipe has been overlapped to the fastener overcoat, connecting pipe fixed connection is in the connecting ring platform, connecting portion or fastening ring platform fixedly connected with limit ring, connecting portion or fastening ring platform cover are equipped with tighrening ring one, the outer lane border threaded connection of tighrening ring one is in the inner wall of connecting pipe, tighrening ring one supports to locate the limit ring towards the one end of another tighrening ring one.

Through adopting above-mentioned technical scheme, connecting portion threaded connection is after the connecting ring platform, rotates tighrening ring one again and makes its threaded connection in connecting pipe to make tighrening ring one to support and locate the restriction ring, in order to do the restriction to the rotation of restriction ring, when reducing the not hard up possibility of connecting portion during the use, can also further optimize connection structure's leakproofness, bear the performance of intraductal pressure during the optimization uses.

Optionally, the connecting portion or the fastening ring is sleeved with a second fastening ring in threaded connection, and the second fastening ring abuts against one end of the first fastening ring, which is far away from the limiting ring.

Through adopting above-mentioned technical scheme, when the tighrening ring two can restrict the not hard up of tighrening ring one, can also make tighrening ring atress relatively more even to optimize the result of use.

Optionally, the first fastening ring abuts against the end face of the limiting ring and is formed by chamfering the edge of the first fastening ring, and the first fastening ring abuts against the end face of the second fastening ring and is formed by chamfering the edge of the first fastening ring.

By adopting the technical scheme, when the connecting part is loosened, the limiting ring is abutted to the chamfer surface of the first fastening ring, and the first fastening ring is more tightly combined with the connecting pipe, so that the obstruction of the loosening of the connecting part is increased; simultaneously when the tighrening ring is not hard up, the border that the outer wall of the chamfer of tighrening ring two can be with a tighrening ring chamfer is blocked to reduce the not hard up possibility of tighrening ring, thereby stability when optimizing the use.

Optionally, a sealing member for sealing is arranged between the first overlapping surface and the second overlapping surface.

Through adopting above-mentioned technical scheme, the leakproofness when the sealing member can further optimize the use reduces the inside liquid of pipeline main part and oozes the possibility.

Optionally, the sealing member includes a joint portion and two sealing portions, the sealing portion is a taper pipe-shaped structure, two the sealing portion is respectively clamped between the first overlapping surface and the flange assembly and between the second overlapping surface and the flange assembly, the joint portion is an annular structure and is simultaneously and fixedly connected to the two sealing portions.

Through adopting above-mentioned technical scheme, two sealing portions can be sealed to the clearance between flange subassembly and the fastening ring platform and the clearance between flange subassembly and the connecting ring platform, and when the joint portion can be sealed to the clearance between fastening ring platform and the connecting flange, joint portion and the integrative setting of sealing portion can optimize the convenience when later stage need be changed the sealing member.

Optionally, a plurality of wall annuluses have all been seted up to sealing portion inner wall and outer wall, the wall annuluses encircles the central axis setting of sealing portion.

Through adopting above-mentioned technical scheme, cut off the annular and can reduce the possibility that produces the leakage because of capillary phenomenon between sealing member and faying surface one or faying surface two.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the flange assembly can be adapted to a flange connection system for connection, and the external force borne by the flange assembly can be dispersed to different directions after connection due to the fact that the angle is more than 90 degrees and more than alpha and more than 45 degrees and more than beta and more than 0 degrees, and the connection stability is optimized;

2. when connecting two adjacent pipelines, only need to rotate connecting portion and drive the fastening ring platform and remove towards the connecting ring platform for fastening ring platform butt in the flange subassembly, and with flange subassembly centre gripping between faying face one and faying face two, in order to can dismantle two adjacent pipeline main parts and connect, when the installation is relatively more convenient, still can not produce the destruction to flange subassembly and pipeline main part itself, simultaneously when sealed effect descends, only need change connecting ring platform or fastener can.

Drawings

FIG. 1 is a schematic structural diagram of a seamless stainless steel tube according to an embodiment of the present invention.

Fig. 2 is an assembly structure diagram of the connection structure according to the embodiment of the present application.

Fig. 3 is a schematic sectional view of line a-a in fig. 2.

Fig. 4 is an enlarged schematic structural view of a portion B in fig. 3.

FIG. 5 is a schematic cross-sectional view of a seal and a support according to an embodiment of the present disclosure.

Fig. 6 is an enlarged schematic view of a portion C of fig. 5.

Description of reference numerals: 1. a pipe body; 2. a flange assembly; 21. a first connecting flange; 22. a second connecting flange; 3. a connecting ring platform; 31. a first lapping surface; 4. a fastener; 41. a connecting portion; 42. a fastening ring table; 43. a second lapping surface; 44. a confinement ring; 45. a fastening ring I; 46. a second fastening ring; 5. a connecting pipe; 51. a stationary ring table; 6. a seal member; 61. a bonding section; 62. a sealing part; 621. partition ring grooves; 622. an inner cavity; 63. a card slot; 7. a support member; 71. a support plate; 72. a butting block; 73. a mesh tube; 74. a catalytic tube.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a precision seamless stainless steel pipe for a hydraulic system pipeline. Referring to fig. 1, a precision seamless stainless steel pipe for a hydraulic system pipe includes a pipe body 1 and a flange assembly 2 provided at one end or both ends of the pipe body 1. The pipe body 1 is of a tubular structure.

The flange assembly 2 comprises a first connecting flange 21 and a second connecting flange 22, the first connecting flange 21 is formed by folding the opening edge of the pipeline main body 1 towards the direction far away from the central axis of the pipeline main body, and the second connecting flange 22 is formed by folding the opening edge of the large end of the first connecting flange 21 towards the direction of the central axis of the pipeline main body 1.

The turning angle of the first connecting flange 21 is alpha, namely the included angle between the first connecting flange 21 and the central axis of the pipeline main body 1 is alpha, and alpha is more than 90 degrees and is more than 45 degrees; the turning angle of the second connecting flange 22 is beta, and the angle is more than 45 degrees and is more than beta and more than 0 degree.

When the flange assembly 2 is installed, the flange assembly 2 can be suitable for connection of a flange system, axial displacement of the pipeline main body 1 can be better limited through the first connecting flange 21 due to the fact that 90 degrees are larger than alpha and larger than 45 degrees and larger than beta and larger than 0 degree, and in use, axial force borne by the flange assembly 2 is converted into component force in different directions through the cooperation of the second connecting flange 22 and the first connecting flange 21, so that the effects of adapting to connection of the flange system and enabling connection to be more stable are achieved.

The production process of the seamless stainless steel tube comprises the following steps:

and (3) blank inspection: removing oxide scales on the surface of the tube blank, checking whether the surface layer of the tube blank has defects such as cracks or not by a dry fluorescent magnetic powder inspection method, an eddy current inspection method or an electromagnetic flaw detection method, and cleaning tiny defects detected on the tube blank by a grinding machine and a wind shovel;

feeding and finish rolling: feeding the qualified pipe blank, and finish-rolling the pipe blank into a pipeline main body 1 through a pipe rolling machine;

and (3) heat treatment: performing bright heat treatment on the pipeline main body 1, performing bright annealing treatment on the pipeline main body 1, so that the temperature of the pipeline main body 1 is slowly reduced to below 500 ℃ in the closed space after the pipeline main body 1 is subjected to heating annealing in the closed space, and then naturally cooling;

straightening: straightening the pipeline main body 1 through a straightening machine, and welding the small end of the connecting flange I21 in the flange assembly 2 to one end of the pipeline main body 1 after straightening;

nondestructive flaw detection: performing nondestructive inspection on the pipeline main body 1 and the flange component 2, and checking whether structural defects exist, wherein the nondestructive inspection can be performed by a dry fluorescent magnetic powder inspection method, an eddy current inspection method or an electromagnetic flaw detection method;

and (3) finishing: finishing the pipeline main body 1 and the flange component 2, and polishing burrs and surfaces of the pipeline main body 1 and the flange component 2.

The embodiment of the application also discloses a connecting structure, referring to fig. 2 and 3, the connecting structure comprises a connecting ring platform 3 and two fasteners 4, and two edges of the connecting ring platform 3, which are far away from the central axis thereof, are chamfered to form a first overlapping surface 31. Wherein the inner diameter of the connection ring 3 is equal to the inner diameter of the pipe body 1.

The fastening piece 4 comprises a tubular connecting part 41 and a fastening ring platform 42 which is coaxial with the connecting part 41, the inner diameter of the fastening ring platform 42 is smaller than that of the connecting part 41, and a second lapping surface 43 is formed on the inner ring edge of one end, facing the connecting part 41, of the fastening ring platform 42 in a chamfering mode.

Referring to fig. 2 and 3, the first overlapping surface 31 is fitted to the outer wall of the flange assembly 2, and the second overlapping surface 43 is fitted to the inner wall of the flange assembly 2, so that both the first overlapping surface 31 and the second overlapping surface 43 are fitted to the flange assembly 2. Two flange assemblies 2 adjacent to opposite ends of the pipe body 1 are clamped between one of the first overlapping surfaces 31 and the second overlapping surface 43 of one of the fastening members 4, and the other flange assembly 2 is clamped between the other first overlapping surface 31 and the second overlapping surface 43 of the other fastening member 4. Both fastening ring blocks 42 are externally threaded and screwed to the connecting ring block 3.

When the adjacent pipelines are installed, the flange assembly 2 can be clamped between the fastening piece 4 and the connecting ring platform 3 by arranging the flange assembly 2 between the first lapping surface 31 and the second lapping surface 43, so that the purpose of fastening and connecting the two adjacent pipeline main bodies 1 is achieved, meanwhile, the structure of the pipeline main body 1 does not need to be damaged, the integrity of the pipeline main body 1 is kept, and because the angle is more than 90 degrees and more than 45 degrees and more than 0 degrees, when the two adjacent pipeline main bodies 1 are connected, the fastening force received by the clamping of the flange assembly 2 can be dispersed to component forces in different directions, the connection stability is improved, meanwhile, the installation is facilitated, the flange assembly 2 is clamped, the connection tightness is improved, and the pressure bearing performance is optimized.

Referring to fig. 3 and 4, in addition, in order to reduce the possibility that the liquid in the pipe may leak out from the gap between the flange assembly 2 and the first overlapping surface 31 or the second overlapping surface 43 due to high pressure during use. A sealing element 6 for sealing is arranged between the first contact surface 31 and the second contact surface 43.

Sealing member 6 includes joint portion 61 and two sealing portions 62, and joint portion 61 is the loop configuration, and sealing portion 62 is taper pipe column configuration and main aspects and sets up towards connecting ring platform 3, and two sealing portions 62's the equal fixed connection in joint portion 61 on the main aspects border. Wherein, the combining portion 61 and the sealing portion 62 are both supported by an elastic material, such as rubber or silicone.

Referring to fig. 4 and 5, one of the seal portions 62 of the same seal 6 is sandwiched between the faying surface one 31 and the flange assembly 2, i.e., between the connecting collar 3 and the flange assembly 2. The other sealing portion 62 of the same seal 6 is clamped between the second overlapping surface 43 and the flange assembly 2, i.e., between the fastening ring platform 42 and the flange assembly 2, and the joint portion 61 is located at the large-end opening edge of the second connecting flange 22.

When the connecting portion 41 is rotated to drive the fastening ring platform 42 to face the connecting ring platform 3 during installation, the two sealing portions 62 can be clamped at the same time, the gap between the first overlapping surface 31 and the flange component 2 and the gap between the second overlapping surface 43 and the flange component 2 are sealed, the gap between the first overlapping surface 31 and the second overlapping surface 43 can be sealed through the joint portion 61, and meanwhile, the connecting portion can be convenient to disassemble and assemble.

In order to reduce the capillary phenomenon generated on the outer wall of the sealing portion 62, a plurality of partition ring grooves 621 are formed on both the outer wall and the inner wall of the sealing portion 62, so as to reduce the capillary phenomenon. The partition ring grooves 621 are distributed along the axial direction of the sealing portion 62 and are disposed along the same central axis.

Referring to fig. 4 and 5, the first overlapping surface 31 and the second overlapping surface 43 are provided with a clamping groove 63 for placing the sealing part 62 corresponding to the outer wall of the second connecting flange 22, the groove wall of the clamping groove 63 is in a conical tube structure and is coaxial with the second connecting flange 22, and the sealing part 62 is partially clamped in the clamping groove 63. Wherein, the flange 21 is simultaneously supported and is located the faying surface 43 on the fastening ring platform 42 and the faying surface 31 on the connecting ring platform 3 to stability when optimizing the use reduces because of later stage sealing member 6 hardens or plastify and leads to the possibility that the clearance between faying surface 31 and faying surface 43 increases.

Referring to fig. 5 and 6, an inner cavity 622 with a taper pipe-shaped structure is formed inside the sealing portion 62, and a support 7 which expands with time is arranged in the inner cavity 622 so as to be able to spread and fully fill the gap between the first bridging surface 31 and the flange assembly 2 or the gap between the second bridging surface 43 and the flange assembly 2 after installation.

Support piece 7 includes two backup pads 71, a plurality of butt joint pieces 72 and a plurality of mesh pipe 73, and backup pad 71 is the taper pipe column structure and sets up with flange two 22 with the central axis, and a plurality of butt joint pieces 72 respectively one-to-one insert locate in mesh pipe 73 and both set up with the central axis, and butt joint piece 72 and mesh pipe 73 are fixed connection respectively in two backup pads 71 facies curb plate face. The plurality of abutting blocks 72 are uniformly arranged between the two supporting plates 71.

Referring to fig. 5 and 6, the inner cavity 622 is filled with a time-delay expansion curing agent, the mesh tube 73 is filled with a catalyst tube 74, the catalyst tube 74 is a closed structure and is filled with a catalyst for catalyzing the time-delay expansion curing agent to cure, the abutting block 72 abuts against the catalyst tube 74, and the catalyst tube 74 is made of a fragile material, such as glass or brittle plastic. Wherein, the delayed expansion curing agent can be selected from water-swelling water-stop glue, and the catalytic tube 74 is filled with water.

When the device is installed, the connecting portion 41 is rotated, the fastening ring table 42 is abutted to the first connecting flange 21, the sealing portion 62 can be extruded by the second overlapping face 43, the supporting plate 71 is pushed, the abutting block 72 is driven to extrude the catalytic tube 74, so that the catalyst flows out from the holes of the mesh tube 73, the time-delay expansion curing agent is solidified after expansion, in the expansion process, the inner cavity 622 can be expanded, the two supporting plates 71 are pushed to move away from each other, the outer wall of the sealing portion 62 is relatively fully filled in the gap, and only the sealing element 6 needs to be replaced during subsequent inspection, and the influence on maintenance is reduced.

Referring to fig. 2 and 3, in order to reduce the possibility of loosening of the fastening collar 42 relative to the connecting collar 3 during use, the fastening member 4 is sheathed with a connecting tube 5 for reducing the possibility of loosening of the fastening collar 42. The connecting pipe 5 and the connecting ring platform 3 are arranged on the same central axis, the inner wall of the connecting pipe 5 is fixedly connected with a fixing ring platform 51 on the same central axis, and the fixing ring platform 51 is sleeved on and fixedly connected with the outer wall of the connecting ring platform 3 so as to fixedly connect the connecting pipe 5 to the connecting ring platform 3 through the fixing ring platform 51. Wherein the stationary ring table 51 is located between two fasteners 4.

The connecting portion 41 or the fastening ring platform 42 is fixedly connected with a limiting ring 44, the connecting portion 41 or the fastening ring platform 42 is fixedly connected with a first fastening ring 45, and the outer ring edge of the first fastening ring 45 is in threaded connection with the inner wall of the connecting pipe 5. One end of the first fastening ring 45 facing the other fastening ring 45 abuts against the limiting ring 44, and the tightening rotation direction of the first fastening ring 45 is opposite to the tightening rotation direction of the fastening ring platform 42. Wherein, the end of the first fastening ring 45 far away from the fixed ring platform 51 is in a hexagonal prism structure, so as to rotate the first fastening ring 45.

When the sealing ring is used, the first fastening ring 45 can abut against the limiting ring 44, so that the fastening ring platform 42 connected with the limiting ring 44 can be limited, the possibility that the fastening ring platform 42 loosens relative to the connecting ring platform 3 in the using process is reduced, and meanwhile, the sealing performance in the using process can be optimized.

Referring to fig. 2 and 3, the connecting portion 41 or the fastening ring platform 42 is sleeved and screwed with a second fastening ring 46, and the second fastening ring 46 abuts against one end of the first fastening ring 45 away from the limiting ring 44, so as to limit the loosening of the first fastening ring 45 and optimize the integrity of use. The outer wall of the end part of the second fastening ring 46 far away from the first fastening ring 45 is in a hexagonal prism structure.

In addition, the end face of the first fastening ring 45 abutted to the limiting ring 44 is formed by chamfering the edge of the inner ring of the first fastening ring 45, the end face of the first fastening ring 45 abutted to the second fastening ring 46 is formed by chamfering the edge of the outer ring of the first fastening ring 45, and the end faces of the opposite ends of the second fastening ring 46 and the limiting ring 44 are both adapted to the two chamfered ring faces formed by chamfering the first fastening ring 45.

Therefore, when the fastening ring platform 42 is used, the abutting surfaces formed by the two chamfers of the first fastening ring 45 can be used, when the fastening ring platform 42 is loosened, the first fastening ring 45 tends to be expanded towards the direction away from the central axis of the first fastening ring 45, the friction force borne by the limiting ring 44 is increased, the loosening of the fastening ring platform 42 fixedly connected to the limiting ring 44 is reduced, the use stability and the sealing performance are further optimized, and meanwhile the limiting effect of the second fastening ring 46 on the first fastening ring 45 can be further effectively achieved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a precision seamless stainless steel pipe for hydraulic system pipeline, includes pipeline main part (1), its characterized in that: the one end or both ends opening border of pipeline main part (1) are provided with flange subassembly (2), flange subassembly (2) are including flange (21) and flange two (22), flange (21) are turned over outwards by pipeline main part (1) right opening border and are rolled over and form, flange two (22) are turned over towards pipeline main part (1) center by flange (21) outer lane border and are rolled over and form, the angle of turning over of flange (21) is alpha, and 90 > alpha > 45, the angle of turning over of flange (21) is beta, and 45 > beta > 0.

2. A production process of a precise seamless stainless steel pipe is characterized by comprising the following steps: the method comprises the following steps: and (3) blank inspection: removing oxidized iron scales on the surface of the tube blank, checking whether the surface layer of the tube blank has defects such as cracks and the like, and cleaning the detected micro defects; feeding and finish rolling: feeding the qualified pipe blank and finish rolling the pipe blank into a pipeline main body (1); and (3) heat treatment: carrying out bright heat treatment on the pipeline main body (1); straightening: straightening the pipeline main body (1), and welding a first connecting flange (21) in the flange component (2) to one end of the pipeline main body (1) after straightening; nondestructive flaw detection: carrying out nondestructive inspection on the pipeline main body (1) and the flange component (2) and checking whether structural defects exist or not; and (3) finishing: finishing the pipeline main body (1) and the flange component (2), and polishing burrs and surfaces of the pipeline main body (1) and the flange component (2).

3. The utility model provides a connection structure of seamless nonrust steel pipe which characterized in that: including connecting ring platform (3) and two fasteners (4), two border chamfers of connecting ring platform (3) away from the center are formed with faying face (31), fastener (4) including being pipy connecting portion (41) and with connecting portion (41) fastening ring platform (42) with the central axis, the internal diameter of fastening ring platform (42) is less than the internal diameter of connecting portion (41), fastening ring platform (42) are formed with faying face two (43) towards connecting portion (41) inner circle border chamfer of connecting, faying face one (31) and faying face two (43) all adapt to flange subassembly (2), flange subassembly (2) are all by the centre gripping between faying face one (31) and faying face two (43), two the equal overcoat of fastening ring platform (42) and threaded connection in connecting ring platform (3).

4. The connecting structure of seamless stainless steel pipes according to claim 3, characterized in that: two fastener (4) overcoat has connecting pipe (5), connecting pipe (5) fixed connection is in connecting ring platform (3), connecting portion (41) or fastening ring platform (42) fixedly connected with limit ring (44), connecting portion (41) or fastening ring platform (42) cover are equipped with fastening ring (45), the outer lane border threaded connection of fastening ring (45) is in the inner wall of connecting pipe (5), limit ring (44) are supported to locating towards the one end of another fastening ring (45) in fastening ring (45).

5. The connecting structure of seamless stainless steel pipes according to claim 4, characterized in that: the connecting part (41) or the fastening ring platform (42) is sleeved and connected with a second fastening ring (46) in a threaded manner, and the second fastening ring (46) abuts against one end, far away from the limiting ring (44), of the first fastening ring (45).

6. The connecting structure of seamless stainless steel pipes according to claim 5, characterized in that: the end face that the first fastening ring (45) supports and locates the limiting ring (44) is the border chamfer shaping of first fastening ring (45), the end face that the first fastening ring (45) supports and locates the second fastening ring (46) is the border chamfer shaping of the same first fastening ring (45).

7. The joint structure of a seamless stainless steel pipe according to any one of claims 3 to 5, wherein: and a sealing element (6) for sealing is arranged between the first overlapping surface (31) and the second overlapping surface (43).

8. The connecting structure of seamless stainless steel pipes according to claim 7, characterized in that: the sealing element (6) comprises a combination part (61) and two sealing parts (62), the sealing parts (62) are of a taper pipe-shaped structure, the two sealing parts (62) are respectively clamped between the first lap joint surface (31) and the flange component (2) and between the second lap joint surface (43) and the flange component (2), and the combination part (61) is of an annular structure and is simultaneously and fixedly connected with the two sealing parts (62).

9. The connecting structure of seamless stainless steel pipes according to claim 8, characterized in that: a plurality of wall annular grooves (621) have all been seted up to sealing portion (62) inner wall and outer wall, wall annular groove (621) encircle the central axis setting of sealing portion (62).