CN107893200A - Low temperature resistant big diameter elbow and its manufacture method - Google Patents
Low temperature resistant big diameter elbow and its manufacture method Download PDFInfo
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- CN107893200A CN107893200A CN201710993318.8A CN201710993318A CN107893200A CN 107893200 A CN107893200 A CN 107893200A CN 201710993318 A CN201710993318 A CN 201710993318A CN 107893200 A CN107893200 A CN 107893200A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D7/00—Bending rods, profiles, or tubes
- B21D7/16—Auxiliary equipment, e.g. for heating or cooling of bends
- B21D7/162—Heating equipment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L43/00—Bends; Siphons
- F16L43/001—Bends; Siphons made of metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
Abstract
The invention provides a kind of low temperature resistant bigbore bend pipe and its manufacture method, the alloying component mass percent of the bend pipe is C：0.1~0.3%, Mn：1.2~2.5%, P：0.2~0.7%, S：0~0.005%, Mo：0.02~0.4%, Cr：0.02~0.3%, Si：0.2~0.7%, Al：0.015~0.035%, Ni：0~0.6%, Ca：0.002~0.005%, Cu：0~0.2%, Ca：0.002~0.005%, remaining is Fe.Manufacture method of the present invention comprises the following steps：Bending technique parameter setting；Vertical masonry joint submerged-arc welding main pipe is placed on Medium frequency induction bending machine；Body is heated by load coil, heating-up temperature is 950 1050 DEG C；Steel pipe promotes walking, and brake forming is bend pipe, while carries out water-spraying control to body；Heating in medium frequency temperature controls with fltting speed.This bend pipe has excellent comprehensive mechanical property, overcomes outer arc and overproof defect is thinned, bent portion cross section circularity is high, particularly has good toughness in low temperature environment.
Description
Technical field
The present invention relates to a kind of oil-gas transportation pipe fitting, is specially a kind of low temperature resistant bigbore bend pipe and its manufacturer
Method.
Background technology
It is conveying gas, liquid or the stream with solid particle in the industrial installations such as petrochemical industry, electric power, metallurgy, boiler
Body applies pipeline in large quantities.
The development trend of China's natural gas engineering in pipeline is further increase throughput rate and reducingd the construction costs as far as possible.
The oil gas supply agreement signed with China and country of Central Asia and Russia is, it is necessary to which it is 45,000,000,000~60,000,000,000 m3/a's to build throughput rate
Natural gas line.2nd generation (X70 and X80) natural gas pipeline projects technology can not meet the needs of super large throughput rate, need to develop
(the 3rd generation) pipeline engineering technology of new generation (grade of steel X90/X100,1219~1422mm of caliber, pressure are not less than 12MPa).Bend pipe
It is the important component of transportation pipeline, because stress condition is complicated during military service, particularly Sino-Russian eastern line very cold, its
Quality condition will directly affect the safe operation of pipeline, therefore the Production and quality control attention of bend pipe.At present, it is domestic big
The high-grade heating bend manufacturing process of throughput rate is still immature, performance can not still meet requirement, it is necessary to further improve its resultant force
Performance is learned, to ensure the safety and reliability of engineering.
In the transfering natural gas from the west to the east project in China, main line pipeline uses 1200mm large diameter pipeline.But oil gas is defeated at present
The bend pipes of the high-grade oil gas pipelines of more than 1200mm sent is domestic still untapped at present, relies primarily on import, and in
The bend pipe for the bore 1422mm that Russia's east line natural gas transportation uses still belongs to blank.For a long time, by environmental condition, raw material and add
The puzzlement of work technique, cryogenically virtually increase difficulty of construction always using electricity or steam tracing insulation with oil-gas transportation bend pipe
And operating cost, and increase a large amount of maintenance tasks.
In order to meet the demand, it is necessary to be finely adjusted to the alloying component of bend pipe and organizational controls, it is resistance to low to improve bend pipe
Warm nature energy and comprehensive mechanical property, meet the gas transmission line requirement of low temp area super large throughput rate.
The content of the invention
For in the prior art the defects of, the present invention provides a kind of low temperature resistant bigbore bend pipe and its manufacture method, makes
Obtaining bend pipe has excellent comprehensive mechanical property and resistance to low temperature.
Low temperature resistant big diameter elbow of the present invention, the alloying component mass percent of steel bend pipe is C：0.1~
0.3%, Mn：1.2~2.5%, P：0.2~0.7%, S：0~0.005%, Mo：0.02~0.4%, Cr：0.02~0.3%,
Si：0.2~0.7%, Al：0.015~0.035%, Ni：0~0.6%, Ca：0.002~0.005%, Cu：0~0.2%, Ca：
0.002~0.005%, remaining is Fe；Carbon equivalent is 0.3~0.42%, and Ni+Cr+Mo+Cu≤0.1%.
Further, the nominal diameter DN of bend pipe：1400mm, outer diameter D：1422mm, nominal wall thickness t：30.1mm minimal wall
Thick tmin：28.0mm, radius of curvature R=6D, flow development length L：1000mm.
Further, the pipe end slope-mouth structure of bend pipe by outer ring to inner ring be followed successively by the first bevel phase, the second bevel phase and
Vertical plane section, wherein, vertical plane section is highly 1.6 ± 0.8mm, and the second bevel phase top is away from groove bottom 19mm, and second is oblique
Face section and vertical plane section angle are 37.5 ± 2.5 °, and the first bevel phase angle is 10 ± 1 °.
Further, Inner arcs side corrugation height h≤1.3mm of the bend loss part of bend pipe, and between adjacent two corrugations crest
It is more than 150 away from f and the ratio between corrugation height h f/h；Wherein h=(D2+D4)/2-D3, D2, D4 are the outer of two adjacent peaks
Footpath, trough external diameters of the D3 between two adjacent peaks.
Method for manufacturing bent pipe of the present invention, using Medium frequency induction bending machine, comprise the following steps：
1) bending technique parameter setting；
2) vertical masonry joint submerged-arc welding main pipe is placed on Medium frequency induction bending machine；
3) body is heated by load coil, heating-up temperature is 950-1050 DEG C；
4) steel pipe is promoted with 0.2-0.8mm/s speed and walked, and brake forming is 10 ° of -90 ° of bend pipes, while to being managed after heating
Body carries out water-spraying control；
5) heating in medium frequency temperature controls with fltting speed；
6) bend pipe terminates.
Further, to 2 points of difference thermometrics of interior outer arc of heating bend, by the position for adjusting load coil in real time
Put, ensure that temperature difference is less than 10 DEG C at temperature and outer arc at Inner arcs.
Further, infrared radiation thermometer is sensed using Non-contact optical fiber, measured using recurrence average filtering method
Temperature, the multiple sample temperature values continuously obtained are lined up a queue in fact, adopts every time to a new data and is put into tail of the queue,
And an original data of head of the queue are extruded, the arithmetic mean of instantaneous value of data in queue is taken every time, that is, obtains required high smoothness
Measurement temperature value.
Further, in step 5), regulating winding translational speed or speed is promoted mainly on the basis of setting speed, realized
Body temperature it is constant.
Further, in temperature closed loop, by speed inner ring, heating coil translational speed, fltting speed matching are realized
Temperature；Heating coil is driven into the parameter settings such as frequency converter, the ramp up time for promoting mainly driving frequency converter, ramp-down time
Unanimously, make heating coil, promote mainly speed and steadily switch.
According to above-mentioned technical proposal, this big diameter elbow bore reaches 1422mm, has filled up domestic blank, meets Sino-Russian east
The super large throughput rate requirement of line natural gas transportation project.This bend pipe has excellent comprehensive mechanical property, and it is thinned super to overcome outer arc
Poor defect, bent portion cross section circularity is high, particularly has good toughness in low temperature environment.This manufacture method is in intermediate frequency
On the basis of sensing bending machine, using intelligent control, using PLC complete monitorings heating-up temperature, rate of bending and angle, realize automatic
Change control, improve properties of product and quality stability.
Brief description of the drawings
, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art.In all of the figs, similar element
Or part is typically identified by similar reference.In accompanying drawing, each element or part might not be drawn according to the ratio of reality.
Fig. 1 is the structural representation of bend pipe；
Fig. 2 is bend pipe pipe end slope-mouth structure；
Fig. 3 is bending section corrugation schematic diagram；
Fig. 4 is temperature adjustment loop control theory figure.
Embodiment
The embodiment of technical solution of the present invention is described in detail below in conjunction with accompanying drawing.Following examples are only used for
Clearly illustrate technical scheme, therefore be only used as example, and the protection model of the present invention can not be limited with this
Enclose.
Embodiment one：
Low temperature resistant big diameter elbow described in the present embodiment, the alloying component mass percent of its steel bend pipe is C：
0.15%, Mn：1.2%, P：0.32%, S：0.008%, Mo：0.02%, Cr：0.02%, Si：0.33%, Al：0.019%,
Ni：0.05%, Ca：0.003%, Cu：0.01%, Ca：0.003%, remaining is Fe, carbon equivalent ce 0.35%.
The performance parameter of the present embodiment bend pipe is as follows：
Referring to Fig. 1, the nominal diameter DN of bend pipe：1400mm, outer diameter D：1422mm, nominal wall thickness t：30.1mm minimal wall
Thick tmin：28.0mm, radius of curvature R=6D, flow development length L：1000mm.
Referring to Fig. 2, the pipe end slope-mouth structure of bend pipe is followed successively by the first bevel phase 1, the and of the second bevel phase 2 by outer ring to inner ring
Vertical plane section 3, wherein, vertical plane section is highly 1.6mm, and the second bevel phase top is away from groove bottom 19mm, and the second bevel phase
It it is 37.5 ° with vertical plane section angle, the first bevel phase angle is 10 °, and above-mentioned groove is for 1422mm heavy calibers and according to low
Warm environment optimizes design, and it can better meet construction technology, has more preferable structural strength.
Referring to Fig. 3, Inner arcs side corrugation height h≤1.3mm of the bend loss part of bend pipe, and adjacent two corrugations corrugation pitch
F is more than 150 with the ratio between corrugation height h f/h；
Wherein h=(D2+D4)/2-D3,
D2, D4 are the external diameter of two adjacent peaks, trough external diameters of the D3 between two adjacent peaks.
In addition, the reduction of this bend pipe=(tmin-t1min)/tmin, wherein, tminThe minimum value of straight length wall thickness, t1minFor
Bend pipe outer arc most thin-walled is thick, and the reduction of this bend pipe is less than 9%.
The method for manufacturing above-mentioned bend pipe, Medium frequency induction bending machine is used, is comprised the following steps：
1) bending technique parameter setting；
2) vertical masonry joint submerged-arc welding main pipe is placed on Medium frequency induction bending machine；
3) body is heated by load coil, heating-up temperature is 950-1050 DEG C；
4) promote mainly hydraulic oil cylinder driving steel pipe and walking is promoted with 0.2-0.8mm/s speed, brake forming is 10 ° of -90 ° of bend pipes, together
When to after heating body carry out water-spraying control；
5) heating in medium frequency temperature controls with fltting speed；
6) when reaching setting angle of bend, bend pipe terminates.
Wherein, to 2 points of difference thermometrics of interior outer arc of heating bend, by adjusting the position of load coil in real time, protect
Demonstrate,prove at Inner arcs that temperature difference is less than 10 DEG C at temperature and outer arc, prevent the inconsistent deformation brought of the temperature difference and property from differing.
Medium frequency bending of pipe Heating Zone Temperature measurement is the emphasis in processing technology, and it has very big influence to quality.We
Using Non-contact optical fiber sensing infrared radiation thermometer in method, measurement temperature is obtained using recurrence average filtering method, in fact even
The continuous multiple sample temperature values obtained line up a queue, adopt every time to a new data and are put into tail of the queue, and extrude head of the queue original
The data come, the arithmetic mean of instantaneous value of data in queue is taken every time, that is, obtain the measurement temperature value of required high smoothness.
During medium frequency bending of pipe, the diathermanous state in heating zone, hot zone width, temperature, the type of cooling and curved speed is pushed away to curved
Pipe quality influences very big.It is to be, by adjusting induction coil translational speed and leading speed, to keep that bend pipe, which pushes away curved key,
Cheng Zhongguan temperatures it is constant.
Regulating winding translational speed or speed is promoted mainly on the basis of setting speed, realize the constant of body temperature.In order to
The reaction speed of quickening system, introduce speed setting value and load regulation is carried out to speed as feed-forward signal.During pushing,
Due to reasons such as external interference, hydraulic system fluctuations, actual speed is caused error occur with given speed.In addition, coil moves
Speed, promote mainly speed switching can not steadily carry out, cause body temperature fluctuation.Therefore, in temperature closed loop, by speed
Ring, realize heating coil translational speed, fltting speed matching temperature；Heating coil is driven into frequency converter, promotes mainly driving frequency converter
Ramp up time, the parameter setting such as ramp-down time it is consistent, make heating coil, promote mainly speed and steadily switch.Temperature is adjusted
It is as shown in Figure 4 to save loop control theory.
Embodiment two：
Low temperature resistant big diameter elbow described in the present embodiment, the alloying component mass percent of its steel bend pipe is C：
0.22%, Mn：2.1%, P：0.41%, S：0.003%, Mo：0.33%, Cr：0.28%, Si：0.55%, Al：0.029%,
Ni：0.04%, Ca：0.004%, Cu：0.1%, Ca：0.002%, remaining is Fe, and remaining technical scheme is identical with embodiment one.
The performance parameter of the present embodiment bend pipe is as follows：
Embodiment three：
Low temperature resistant big diameter elbow described in the present embodiment, the alloying component mass percent of its steel bend pipe is C：
0.26%, Mn：2.3%, P：0.66%, S：0.001%, Mo：0.29%, Cr：0.14%, Si：0.53%, Al：0.033%,
Ni：0.03%, Ca：0.005%, Cu：0.2%, Ca：0.004%, remaining is Fe, and remaining technical scheme is identical with embodiment one.
The performance parameter of the present embodiment bend pipe is as follows：
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those within the art that：It still may be used
To be modified to the technical scheme described in previous embodiment, either which part or all technical characteristic are equal
Replace；And these modifications or replacement, the essence of appropriate technical solution is departed from the model of technical scheme of the embodiment of the present invention
Enclose, it all should cover among the claim of the present invention and the scope of specification.
Claims (9)
- A kind of 1. low temperature resistant big diameter elbow, it is characterised in that：The alloying component mass percent of steel bend pipe is C：0.1~0.3%, Mn：1.2~2.5%, P：0.2~0.7%, S：0 ~0.005%, Mo：0.02~0.4%, Cr：0.02~0.3%, Si：0.2~0.7%, Al：0.015~0.035%, Ni：0 ~0.6%, Ca：0.002~0.005%, Cu：0~0.2%, Ca：0.002~0.005%, remaining is Fe；Carbon equivalent is 0.3~0.42%, and Ni+Cr+Mo+Cu≤0.1%.
- 2. low temperature resistant big diameter elbow according to claim 1, it is characterised in that：The nominal diameter DN of bend pipe：1400mm, Outer diameter D：1422mm, nominal wall thickness t：30.1mm, minimum wall thickness (MINI W.) tmin：28.0mm, radius of curvature R=6D, flow development length L： 1000mm。
- 3. low temperature resistant big diameter elbow according to claim 2, it is characterised in that：The pipe end slope-mouth structure of bend pipe is by outer ring The first bevel phase, the second bevel phase and vertical plane section are followed successively by inner ring, wherein, vertical plane section is highly 1.6 ± 0.8mm, the Two bevel phase tops are away from groove bottom 19mm, and the second bevel phase and vertical plane section angle are 37.5 ± 2.5 °, the first bevel phase Angle is 10 ± 1 °.
- 4. low temperature resistant big diameter elbow according to claim 3, it is characterised in that：The Inner arcs side of the bend loss part of bend pipe Wrinkle height h≤1.3mm, and adjacent two corrugation corrugation pitch f and the ratio between corrugation height h f/h is more than 150；Wherein h=(D2+D4)/2-D3,D2, D4 are the external diameter of two adjacent peaks, trough external diameters of the D3 between two adjacent peaks.
- 5. a kind of manufacture method for manufacturing bend pipe as claimed in claim 4, utilizes Medium frequency induction bending machine, it is characterised in that bag Include following steps：1) bending technique parameter setting；2) vertical masonry joint submerged-arc welding main pipe is placed on Medium frequency induction bending machine；3) body is heated by load coil, heating-up temperature is 950-1050 DEG C；4) steel pipe is promoted with 0.2-0.8mm/s speed and walked, and brake forming is 10 ° of -90 ° of bend pipes, while body after heating is entered Row water-spraying control；5) heating in medium frequency temperature controls with fltting speed；6) bend pipe terminates.
- 6. manufacture method according to claim 5, it is characterised in that：Thermometrics are distinguished to 2 points of the interior outer arc of heating bend, By adjusting the position of load coil in real time, ensure that temperature difference is less than 10 DEG C at temperature and outer arc at Inner arcs.
- 7. manufacture method according to claim 6, it is characterised in that：Infrared radiation thermometer is sensed using Non-contact optical fiber, Measurement temperature is obtained using recurrence average filtering method, the multiple sample temperature values continuously obtained are lined up a queue in fact, Adopt every time to a new data and be put into tail of the queue, and extrude an original data of head of the queue, take the arithmetic of data in queue every time Average value, that is, obtain the measurement temperature value of required high smoothness.
- 8. manufacture method according to claim 7, it is characterised in that：In step 5), adjusted on the basis of setting speed Nodel line circle translational speed promotes mainly speed, realizes the constant of body temperature.
- 9. manufacture method according to claim 8, it is characterised in that：In temperature closed loop, by speed inner ring, realize and add Heat coil translational speed, fltting speed matching temperature；Heating coil is driven into frequency converter, promotes mainly ramping up for driving frequency converter The parameter settings such as time, ramp-down time are consistent, make heating coil, promote mainly speed and steadily switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993318.8A CN107893200A (en) | 2017-10-23 | 2017-10-23 | Low temperature resistant big diameter elbow and its manufacture method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710993318.8A CN107893200A (en) | 2017-10-23 | 2017-10-23 | Low temperature resistant big diameter elbow and its manufacture method |
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| CN107893200A true CN107893200A (en) | 2018-04-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517113A (en) * | 2006-07-13 | 2009-08-26 | 住友金属工业株式会社 | Bend pipe and process for producing the same |
| CN101880818A (en) * | 2010-06-04 | 2010-11-10 | 中国石油天然气集团公司 | Preparation method of X80 bent pipe and steel for pipe fittings |
| CN102268612A (en) * | 2011-08-25 | 2011-12-07 | 中国石油集团渤海石油装备制造有限公司 | X80 steel elbow with low temperature resistance and manufacturing process thereof |
-
2017
- 2017-10-23 CN CN201710993318.8A patent/CN107893200A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101517113A (en) * | 2006-07-13 | 2009-08-26 | 住友金属工业株式会社 | Bend pipe and process for producing the same |
| CN101880818A (en) * | 2010-06-04 | 2010-11-10 | 中国石油天然气集团公司 | Preparation method of X80 bent pipe and steel for pipe fittings |
| CN102268612A (en) * | 2011-08-25 | 2011-12-07 | 中国石油集团渤海石油装备制造有限公司 | X80 steel elbow with low temperature resistance and manufacturing process thereof |
Non-Patent Citations (1)
| Title |
|---|
| 何利民等: "《大型油气储运设施施工》", 30 September 2007, 中国石油大学出版 * |
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Application publication date: 20180410 |
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