CN101251215A - Reactor main pipe hot leg elbow and method for manufacturing the same - Google Patents
Reactor main pipe hot leg elbow and method for manufacturing the same Download PDFInfo
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- CN101251215A CN101251215A CNA200810300744XA CN200810300744A CN101251215A CN 101251215 A CN101251215 A CN 101251215A CN A200810300744X A CNA200810300744X A CN A200810300744XA CN 200810300744 A CN200810300744 A CN 200810300744A CN 101251215 A CN101251215 A CN 101251215A
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Abstract
The invention discloses a reactor main pipe hot section bend pipe used for the third generation nuclear power stations and a manufacturing method thereof, and can meet the technical requirement of the third generation nuclear power stations to the pipe. The pipe comprises a bending section with a bending radius R equal to 1.5D, straight pipe sections arranged on both ends of the bending section, and a pipe body formed by two pipe mouths on the straight pipe sections close to the bending section, wherein, the pipe body has an integrated structure of the whole forgeable piece, the volume of the space in the pipe that the pipe body is filled through a core mold is greater than 95 percent of compression mold of a combined molding mold at the bending section, the straight pipe sections and the pipe mouths adopt the machining molding. The manufacturing method can meet the technical requirement of a main pipe hot section bend pipe, can assure the metal structure and performance of the pipe body, also decreases the machining difficulty, has less metal cutting output, and greatly decreases the processing production difficulty and the cost. The whole set of mold has no processing difficulty, can be manufactured by the ordinary machining equipment, and can be applied in the processing production of integrated large-scale fittings with straight pipe sections and bending sections.
Description
Technical field
The present invention relates to a kind of hot segment of bent pipe of main pipeline of reactor and manufacture method thereof that is used for third generation nuclear power station.
Background technique
At present, the advanced large-scale AP1000 pressurized-water reactor nuclear power plant of the newly-designed third generation, be at present in the world two generation nuclear power station and two generations add the update type of nuclear power station.Its major advantage have working life from before be increased to 60 years in 40 years, the electric motor power of single seat nuclear power station reaches 1,250,000 kilowatts.Because technology improves, and requires equipment to reduce weld seam as far as possible, reduced a lot of in labour work for inspection amount, advantage such as also have compact structure, Security is good, generated energy is big, but shortcomings such as manufacture difficulty is big are also arranged.It is integrated that its hot segment of bent pipe of main pipeline makes stainless steel monobloc forging band ozzle into by original stainless steel segmentation foundry goods (straight tube adopts centrifugal casting and elbow to adopt conventional cast) welding, and straight tube, elbow, the nozzle design of segmentation become integrated forging, strengthened the difficulty of making.The AP1000 reactor is not also being built unit at present, China takes the lead in starting this type, and hot segment of bent pipe of main pipeline also requires to be the monobloc forging formula and to be with ozzle, because of complex-shaped, manufacture difficulty is very big, and the fabrication scheme that provides is that the method with machining processes after the solid forging.The required stainless steel ingot of forging reaches 150 tons, and pipe orifice almost is difficult to process with the method for machinery, and the tissue of forging and performance also are difficult to guarantee.
The AP1000 hot segment of bent pipe of main pipeline all also there is not ripe manufacturing technology both at home and abroad at present, it is Ultralow Carbon Stainless Steel heavy forging (316LN), therefore similar products like in the world all seldom, all has more technological difficulties on operations such as smelting, forging, brake forming, machining.Hot leg elbow one end length of straight pipe 2235mm, the other end length of straight pipe 1234mm, the centre is the 1.5D bend radius bent pipe, and two integrated ozzles is being arranged shown in Fig. 1～4 near the crooked position place.The external diameter of this hot leg elbow is 952.5mm, and internal diameter is 787.4mm, and the bend angle of bending section is 56.4 °, and its technical requirements is: crooked position out of roundness≤4%, crooked back of the body arc attenuate amount≤12.5%, nominal wall thickness 82.55mm, minimum wall thickness (MINI W.) 72.2mm.
The technological difficulties of above-mentioned hot leg elbow machine shaping are:
1, bending radius is the bending of 1.5D two ends band straight tube.
The bending radius of elbow is 1D～1.5D, and straight length is not with at two ends, and bend pipe just is with straight length.The manufacturing process of elbow has two kinds, and the one, compression moulding, the 2nd, pick the type of making.The manufacturing process of bend pipe is the Frequency Induction Heating bend pipe, the bending radius of bend pipe is general 〉=and 3D, if bending radius is less than 3D, the ovality of crooked position and attenuate amount can fiercely increase, when bending radius was 1.5D, the attenuate amount of bend pipe back of the body arc was up to 25%, and ovality ≈ 15%.
The compression molding elbow, the contour shape of its blank is trapezoidal.The trapezoidal bottom edge lengths is the length of run of the outer camber line of elbow, and trapezoidal top margin length is the length of run of camber line in the elbow.During brake forming, blank brake forming under the effect of interior external mold.Figure 10 is a 1.5D semi major axis elbow compression moulding schematic diagram, and Figure 11 is 1.5D semi major axis elbow blank figure.The fill factor that its core is filled space in the body generally has only about 80%, and the fill factor here is core volume and the ratio of managing interior spatial volume.Therefore, the ovality of product crooked position nearly 15%.This technology is the conventional process of elbow compression moulding.
Behind the two sideband straight tubes, blank just can not be made into trapezoidal, can only make the straight tube shape.The inner arc metal can only compress when crooked, and the outer arc metal can only stretch, and when not taking measures, the attenuate of outer arc is up to 33%.Therefore, the crooked difficulty of the bend pipe of two ends band straight tube and radius of curvature R=1.5D is very big.
2, have two ozzles respectively near the crooked position place.
After ozzle and bend pipe are integrated, increased great difficulty for the design of compacting tool set, and the metal at ozzle position can not get even compression in when making moulding, asymmetric outer tube mouth steric hindrance has been ended when stretching flowing of metal and has been replenished.
Summary of the invention
Technical problem to be solved by this invention provides a kind of hot segment of bent pipe of main pipeline of reactor and manufacture method thereof that satisfies the technical requirements of third generation nuclear power station.
The technical solution adopted for the present invention to solve the technical problems is: hot segment of bent pipe of main pipeline, comprise on the bending section of radius of curvature R=1.5D, the straight length that is arranged on the bending section two ends and the straight length body that two ozzles that the position near bending section is provided with constitute, it is characterized in that: body is the integrative-structure of solid forging, bending section is by compression molding, straight length and ozzle adopt the machining moulding, wherein, D is the body external diameter.Like this, the hot segment of bent pipe of main pipeline of its solid forging is through after the compression molding, and the metal structure of its body and performance can be effectively guaranteed.
Above-mentioned hot segment of bent pipe of main pipeline of reactor, two ozzle can be to be separately positioned on the straight length at bending section two ends, and the axis of two ozzles is not at grade; Also can be that two ozzles are arranged on the straight length of bending section one end simultaneously, the axis of two ozzles be in the same plane.
Further be that above-mentioned body adopts Ultralow Carbon Stainless Steel to make.
The manufacture method of hot segment of bent pipe of main pipeline is characterized in that: comprise the steps:
A, making comprise the combined shaping mold of upper die and lower die and core, and core adopts metal to make, and core is filled the fill factor in space in the body greater than 95%; Wherein, fill factor is core volume and the ratio of managing interior spatial volume.
B, produce the pipe of straight tube-like according to the each several part construction profile of body;
C, pipe is carried out machining, process body endoporus and excircle, ozzle endoporus and excircle.
D, with the core pipe of packing into, place compression moulding between patrix and the counterdie then;
E, taking-up core, the end face at machining body two ends and the end face of ozzle thereof;
F, full surface finish.
Further be behind step C, to carry out ultrasonic flaw detection.
Further be behind step D, whole body to be carried out solution treatment.
Further be after step F, to carry out Liquid penetrant examination and ultrasonic flaw detection for the second time.
As the optimization to technique scheme, the fill factor that core is filled space in the body is 97.5%.
The invention has the beneficial effects as follows: because the integrative-structure of hot segment of bent pipe of main pipeline employing solid forging and bending section are by compression molding, not only satisfied the technical requirements of hot segment of bent pipe of main pipeline, compare with mach hot segment of bent pipe of main pipeline simultaneously, the metal structure of its body and performance can obtain more effectively guaranteeing, also reduced the machining difficulty simultaneously, the metal cutting amount is few, and blank weight reduces more than 50%, greatly reduces processing and manufacturing difficulty and cost.A whole set of mould does not have difficulty of processing, just can make with general machining apparatus, also can be applicable to have the processing and fabricating of the integrated large-size pipe of straight length and bending section.
Description of drawings
Fig. 1 is the plan view of a kind of hot segment of bent pipe of main pipeline of reactor of structural type among the present invention.
Fig. 2 is along the sectional view of A-A direction among Fig. 1.
Fig. 3 is along the sectional view of B-B direction among Fig. 1.
Fig. 4 is the plan view of the hot segment of bent pipe of main pipeline of reactor of another kind of structural type among the present invention.
Fig. 5 is the sectional view of a kind of pipe of hot segment of bent pipe of main pipeline of reactor of structural type among the present invention.
Fig. 6 is the sectional view of the pipe of the hot segment of bent pipe of main pipeline of reactor of another kind of structural type among the present invention.
Fig. 7 is that employing of the present invention is combined into pattern carries out shaping operation to the camber section schematic representation.
Fig. 8 is the sectional view along C-C direction among Fig. 7.
Fig. 9 is the matching relationship decomposing schematic representation of core under core and the matrix under the convex among Fig. 7.
Figure 10 is an elbow compression moulding schematic diagram commonly used.
Figure 11 is 1.5D semi major axis elbow blank figure.
Be labeled as among the figure: core 102, shoulder plane 11, straightway metope 12 under core 101, the matrix under core 10, the convex under core 9, the bending section under core 8, the straight length on core 7, the bending section on bending section 1, straight length 2, ozzle 3, patrix 4, counterdie 5, chock 6, the straight length, cavity 13, projection 14, groove 15.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1～shown in Figure 9, hot segment of bent pipe of main pipeline of reactor of the present invention, comprise on the bending section 1 of radius of curvature R=1.5D, the straight length 2 that is arranged on bending section 1 two ends and the straight length 2 body that two ozzles 3 that the position near bending section 1 is provided with constitute, D is the body external diameter.Body can adopt Ultralow Carbon Stainless Steel to make, and body is the integrative-structure of solid forging.Wherein, bending section 1 is by compression molding, and straight length 2 and ozzle 3 adopt the machining moulding.Bending section 1 more can guarantee metal structure and the performance of body than bending section 1 by the machining moulding by compression molding, thereby effectively guarantees the technical requirements and the combination property of its body.
The distributing position of two ozzles 3 of above-mentioned hot segment of bent pipe of main pipeline of reactor can be following structural type, a kind ofly is: two ozzles 3 are separately positioned on the straight length 2 at bending section 1 two ends, and the axis of two ozzles 3 is not at grade; Another kind is: two ozzles 3 are arranged on the straight length 2 of bending section 1 one ends simultaneously, and the axis of two ozzles 3 is in the same plane.
The manufacture method of hot segment of bent pipe of main pipeline comprises the steps:
A, make the combined shaping mold comprise patrix 4, counterdie 5 and core 6, core adopts metal to make, thereby can pack into from the straight tube of pipe easily, and the demoulding the body bending section behind bend pipe easily; During the design core, the fill factor that makes space in its core filling body preferably reaches 97.5% greater than 95%, so just can further guarantee to make when compression molding its briquetting pressure evenly to transmit, be convenient to evenly flowing of metal, also can guarantee the circularity requirement of product simultaneously;
B, produce the pipe of straight tube-like according to the each several part construction profile of body;
C, pipe is carried out machining, process body endoporus and excircle, ozzle 3 endoporus and excircle.
D, with the core pipe of packing into, place compression moulding between patrix 4 and the counterdie 5 then, form the bending section 1 of body;
E, taking-up core, the end face at machining body two ends and the end face of ozzle 3 thereof;
F, full surface finish.
Behind above-mentioned steps C, carry out ultrasonic flaw detection, can further guarantee quality of tube blank steel.
Behind above-mentioned steps D, whole body is carried out solution treatment, after step F, carry out Liquid penetrant examination and the work of ultrasound spy for the second time, further strengthen the structure property of workpiece, guarantee quality of processing.
The combinations thereof shaping die, comprise patrix 4, counterdie 5 and core, core adopts metal to make, patrix 4 and counterdie 5 be provided with body on the position and the suitable cavity 13 of size of ozzle 3, core is filled the fill factor in space in the body greater than 95%, preferably reaches 97.5%.
Core comprises core and a plurality of chock 6 formations under core on the polylith, the polylith, the quantity of last core, following core is many more, can guarantee volume that core fills space in the pipe of body of hot segment of bent pipe of main pipeline more greater than 95%, thereby reach the technical requirements of the out of roundness of the bending section of body, crooked back of the body arc attenuate amount etc.Chock 6 be arranged between core and the following core and the diameter of the width of chock 6 and body endoporus suitable, the axis of chock 6 is on the axis of body endoporus, is used for wedging and withdraws from core.Last core, down the quantity of core and chock 6 equates, the last core of corresponding part, position, descends core and chock 6 length on the axially bored line in body suitable, thereby makes it can phase mutual interference when bend pipe.Wherein:
A, go up core and comprise on two straight lengths core 8 on the core 7 and polylith bending section, the length of core 7 is mated with the length of the straight length 2 of corresponding body on the straight length, on the polylith bending section core 8 stacked arrangement and stacked after the length and the inner hole wall arc length of the bending section 1 of body suitable, thereby guarantee the smooth smooth of circular arc in the bending section of body.
B, following core comprises under the straight length core 10 under the core 9 and polylith bending section, the length of core 9 is mated with the length of the straight length 2 of corresponding body under the straight length, core 10 is made up of core 102 under core 101 and the matrix under the polylith convex under the bending section, the shoulder plane 11 of core 101 is provided with axial projection 14 under the convex, the shoulder plane 11 of core 102 is provided with axial groove 15 under the matrix, core 101 under the adjacent convex, the 11 mutual planes contact of shoulder plane and the projection 14 of core 102 cooperates with groove 15 under the matrix, and core 101 under the polylith convex, under the matrix core 102 at interval stacked arrangement and stacked after the length and the interior axially bored line arc length of the bending section 1 of body suitable; The above-mentioned stacked arrangement of core 102 under core 101, the matrix under the polylith convex, the one, whole core is played circumferential positioning action, relatively moving of circumferencial direction can not take place in parts adjacent in the promptly whole core; The 2nd, in forming process, only be on the shoulder plane of plane contact, to slide but do not break away from plane contact between the core 102 under core 101, the matrix under the adjacent convex, make the axial arc of bend pipe after the moulding good, there is not ring sample defective, promptly surfacing is smooth.
In order to guarantee the circularity requirement of product, counterdie 5 both sides are straightway metope 12, and patrix 4 is inserted between the straightway metope 12 of counterdie 5, and the width between the straightway metope 12 of the width of patrix 4 and counterdie 5 both sides is suitable.Like this, the bending section 1 that makes its body can both obtain the guard circle protection from managing bad straight tube in the process of whole brake forming.
Embodiment 1: hot segment of bent pipe of main pipeline of the present invention, comprise on the bending section 1 of bending radius 1.5D, the straight length 2 that is arranged on bending section 1 two ends and the straight length 2 body that two ozzles 3 that the position near bending section 1 is provided with constitute, and D is the body external diameter.Two ozzles 3 are separately positioned on the straight length 2 at bending section 1 two ends, and the axis of two ozzles 3 is not at grade.Body adopts Ultralow Carbon Stainless Steel to make, and body is the integrative-structure of solid forging.Wherein, bending section 1 is by compression molding, and straight length 2 and ozzle 3 adopt the machining moulding.Adopt said method and combined shaping mold mold pressing processing bending section 1, the volume that core is filled the interior space of pipe of body is 95%, and the processing back is tested product, meets design requirement.
Embodiment 2: hot segment of bent pipe of main pipeline of the present invention, comprise on the bending section 1 of radius of curvature R=1.5D, the straight length 2 that is arranged on bending section 1 two ends and the straight length 2 body that two ozzles 3 that the position near bending section 1 is provided with constitute, and D is the body external diameter.Two ozzles 3 are arranged on the straight length 2 of bending section 1 one ends simultaneously, and the axis of two ozzles 3 is in the same plane.Body adopts Ultralow Carbon Stainless Steel to make, and body is the integrative-structure of solid forging.Wherein, bending section 1 is by compression molding, and straight length 2 and ozzle 3 adopt the machining moulding.Adopt said method and combined shaping mold mold pressing processing bending section 1, the volume that core is filled the interior space of pipe of body is 97.5%, and the processing back is tested product, meets design requirement.
Claims (9)
1. hot segment of bent pipe of main pipeline of reactor, comprise the body that last two ozzles (3) that are provided with near the position of bending section (1) of the bending section (1) of radius of curvature R=1.5D, the straight length (2) that is arranged on bending section (1) two ends and straight length (2) constitute, it is characterized in that: body is the integrative-structure of solid forging, bending section (1) is by compression molding, straight length (2) and ozzle (3) adopt the machining moulding, wherein, D is the body external diameter.
2. hot segment of bent pipe of main pipeline of reactor as claimed in claim 1 is characterized in that: two ozzles (3) are separately positioned on the straight length (2) at bending section (1) two ends, and the axis of two ozzles (3) is not at grade
3. hot segment of bent pipe of main pipeline as claimed in claim 1 is characterized in that: two ozzles (3) are arranged on the straight length (2) of bending section (1) one end simultaneously, and the axis of two ozzles (3) is in the same plane.
4. as claim 1,2 or 3 described hot segment of bent pipe of main pipeline of reactor, it is characterized in that: body adopts Ultralow Carbon Stainless Steel to make.
5. the manufacture method of hot segment of bent pipe of main pipeline of reactor is characterized in that: comprise the steps:
A, making comprise the combined shaping mold of patrix (4), counterdie (5) and core, and core employing metal is made, and core is filled the fill factor in space in the body greater than 95%, and wherein, fill factor is core volume and the ratio of managing interior spatial volume.
B, produce the pipe of straight tube-like according to the each several part construction profile of body;
C, pipe is carried out machining, process body endoporus and excircle, ozzle (3) endoporus and excircle.
D, with the core pipe of packing into, place compression moulding between patrix (4) and the counterdie (5) then;
E, taking-up core, the end face of the end face at machining body two ends and ozzle (3) thereof;
F, full surface finish.
6. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 5 is characterized in that: step and after carry out ultrasonic flaw detection.
7. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 6 is characterized in that: behind step D whole body is carried out solution treatment.
8. the manufacture method of hot segment of bent pipe of main pipeline of reactor as claimed in claim 7 is characterized in that: carry out Liquid penetrant examination and ultrasonic flaw detection for the second time after step F.
9. as the manufacture method of claim 5,6,7 or 8 described hot segment of bent pipe of main pipeline of reactor, it is characterized in that: the fill factor that core is filled space in the body is 97.5%.
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| CN101745782A (en) * | 2008-12-22 | 2010-06-23 | 二重集团（德阳）重型装备股份有限公司 | Method for manufacturing hot segment of bent pipe of main pipeline of reactor |
| CN101783191B (en) * | 2009-01-21 | 2012-05-16 | 中国核电工程有限公司 | Super pipeline for nuclear power plant as well as manufacturing method thereof |
| CN102632182A (en) * | 2012-03-23 | 2012-08-15 | 江阴南工锻造有限公司 | Forging molding process for integral hollow nuclear power main pipe |
| CN103659167A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe fitting machining method |
| CN103672272A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe blank |
| CN103791170A (en) * | 2012-10-31 | 2014-05-14 | 丰田自动车株式会社 | Pipe with rib and method for manufacturing pipe with rib |
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| CN103867835A (en) * | 2012-12-13 | 2014-06-18 | 中国核动力研究设计院 | Integrally forged main pipe |
| CN108223948A (en) * | 2017-12-13 | 2018-06-29 | 浙江伟星新型建材股份有限公司 | PPR three-way pipes and its manufacturing method |
| CN108889792A (en) * | 2018-05-25 | 2018-11-27 | 无锡市新峰管业有限公司 | A kind of super wall thickness seamless elbow pipe fitting forming technique of heavy caliber |
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| CN114309127A (en) * | 2020-09-29 | 2022-04-12 | 郑州万达重工股份有限公司 | Inner wall surfacing small-bending-radius bent pipe and forming method thereof |
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| CN1050835A (en) * | 1990-08-01 | 1991-04-24 | 大连弯头化工机械厂 | Variable-diameter special-shaped seamless metal pipe bend forming method |
| CN1072627A (en) * | 1991-11-28 | 1993-06-02 | 陈振业 | The manufacture method of the steel elbow of band straight length and mould and products thereof |
| CN2195984Y (en) * | 1994-06-18 | 1995-05-03 | 国营庆安宇航设备公司 | Equipment for bending tube |
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| CN101745782A (en) * | 2008-12-22 | 2010-06-23 | 二重集团（德阳）重型装备股份有限公司 | Method for manufacturing hot segment of bent pipe of main pipeline of reactor |
| CN101783191B (en) * | 2009-01-21 | 2012-05-16 | 中国核电工程有限公司 | Super pipeline for nuclear power plant as well as manufacturing method thereof |
| CN102632182B (en) * | 2012-03-23 | 2014-06-11 | 江阴南工锻造有限公司 | Forging molding process for integral hollow nuclear power main pipe |
| CN102632182A (en) * | 2012-03-23 | 2012-08-15 | 江阴南工锻造有限公司 | Forging molding process for integral hollow nuclear power main pipe |
| CN103659167A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe fitting machining method |
| CN103672272A (en) * | 2012-09-11 | 2014-03-26 | 北京首宏钢重型装备技术有限公司 | Pipe blank |
| CN103791170B (en) * | 2012-10-31 | 2016-11-23 | 丰田自动车株式会社 | Pipe with ribbing and its manufacture method |
| CN103791170A (en) * | 2012-10-31 | 2014-05-14 | 丰田自动车株式会社 | Pipe with rib and method for manufacturing pipe with rib |
| CN103817278B (en) * | 2012-11-19 | 2016-04-06 | 上海重型机器厂有限公司 | The manufacture method of third generation compressed water reactor nuclear power cooling medium pump pump case forging |
| CN103817278A (en) * | 2012-11-19 | 2014-05-28 | 上海重型机器厂有限公司 | Method for manufacturing pump shell forging of third-generation pressurized water reactor nuclear power coolant pump |
| CN103867835A (en) * | 2012-12-13 | 2014-06-18 | 中国核动力研究设计院 | Integrally forged main pipe |
| CN108223948A (en) * | 2017-12-13 | 2018-06-29 | 浙江伟星新型建材股份有限公司 | PPR three-way pipes and its manufacturing method |
| CN108889792B (en) * | 2018-05-25 | 2020-03-17 | 无锡市新峰管业有限公司 | Forming process of large-caliber super-wall-thickness seamless elbow pipe fitting |
| CN108889792A (en) * | 2018-05-25 | 2018-11-27 | 无锡市新峰管业有限公司 | A kind of super wall thickness seamless elbow pipe fitting forming technique of heavy caliber |
| CN109187864A (en) * | 2018-09-06 | 2019-01-11 | 苏州热工研究院有限公司 | Used in nuclear power station forges main pipeline manufacturing process assessment method |
| CN109187864B (en) * | 2018-09-06 | 2021-02-26 | 苏州热工研究院有限公司 | Method for evaluating manufacturing process of forged main pipeline for nuclear power station |
| CN111375990A (en) * | 2018-12-29 | 2020-07-07 | 上海新闵重型锻造有限公司 | Manufacturing method of S-shaped elbow |
| CN110005895A (en) * | 2019-04-04 | 2019-07-12 | 中国核电工程有限公司 | Reducing elbow and the pipe arrangement connection method for utilizing reducing elbow |
| CN110005895B (en) * | 2019-04-04 | 2021-08-10 | 中国核电工程有限公司 | Reducing elbow and pipeline arrangement and connection method using same |
| CN114309127A (en) * | 2020-09-29 | 2022-04-12 | 郑州万达重工股份有限公司 | Inner wall surfacing small-bending-radius bent pipe and forming method thereof |
| CN114309127B (en) * | 2020-09-29 | 2023-09-26 | 郑州万达重工股份有限公司 | Inner wall surfacing small bending radius bent pipe and forming method thereof |
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