CN105728911A - Process for welding steel pipes of pipelines - Google Patents
Process for welding steel pipes of pipelines Download PDFInfo
- Publication number
- CN105728911A CN105728911A CN201610271319.7A CN201610271319A CN105728911A CN 105728911 A CN105728911 A CN 105728911A CN 201610271319 A CN201610271319 A CN 201610271319A CN 105728911 A CN105728911 A CN 105728911A
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- welding
- pipe line
- wire
- line steel
- weld
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- 238000003466 welding Methods 0.000 title claims abstract description 103
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000008569 process Effects 0.000 title abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 230000004907 flux Effects 0.000 claims abstract description 3
- 238000003801 milling Methods 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 7
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 239000002932 luster Substances 0.000 claims description 3
- 230000002146 bilateral effect Effects 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 241000251468 Actinopterygii Species 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000010953 base metal Substances 0.000 abstract 3
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
- B23K9/186—Submerged-arc welding making use of a consumable electrodes
- B23K9/188—Submerged-arc welding making use of a consumable electrodes making use of several electrodes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
- B23K33/006—Filling of continuous seams for cylindrical workpieces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/095—Monitoring or automatic control of welding parameters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/164—Arc welding or cutting making use of shielding gas making use of a moving fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/10—Pipe-lines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a process for welding steel pipes of pipelines. The process includes steps that double-edge X-shaped grooves with internal and external groove angles of 45 degrees are formed in steel plates of pipeline steel, and rust on base metal within 50 mm ranges of two sides of each edge of each steel plate of the pipelines is removed; Ar+CO2 mixed gas shielded welding is carried out by the aid of pulse welding power sources matched with solid-core welding wires, and the strength of the solid-core welding wires is not lower than the strength of the base metal; multi-wire submerged-arc welding is carried out, welding sequences include carrying out internal welding at first and then carrying out external welding, the diameters of welding wires are unequal to one another, internal welding is carried out on small welding specifications, external welding is carried out on large welding specifications, submerged-arc welding is matched with the solid-core welding wires and sintered flux, and the strength of the solid-core welding wire is not lower than the strength of the base metal. The process has the advantages that mechanical properties of weld seams can be guaranteed, the appearance of the weld seams can be effectively improved, fish ridges can be eliminated, and the corrosion prevention cost can be reduced; the process is low in production cost, high in applicability and convenient to popularize and apply.
Description
Technical field
The present invention relates to genus welding technology field, is related specifically to pipe line steel tubulation welding procedure.
Background technology
In recent years, the branch line after the defeated Trunk Line of oil company head builds up is built in the ascendant, and pipeline demand focuses primarily upon
Thin wall thickness steel tube, for straight-line joint submerged arc welding tube JCOE tube-making process, i.e. welds employing " prewelding (Ar+CO2Mixed gas arc welding
Or CO2Gas shielded arc welding)+astute and able (inside and outside submerged-arc welding) ".During for 12mm≤wall thickness≤15mm straight-line joint pipeline steel submerged arc welding,
Tube mill all uses three wire bonds, has an advantage in that weld heat input is little, and weld properties is good, but appearance of weld width is relatively
Narrow, the fullest open defect of weld edge is more, particularly easily occurs fish back in the middle of outside weld so that steel pipe is outside carrying out
During anticorrosion, owing to weld seam transition is unsmooth, cause anticorrosive coat rupture need to anticorrosion again, the most both have impact on welding quality, the most greatly
Add greatly anticorrosion difficulty and anticorrosion cost.
For 12mm≤wall thickness≤15mm straight-line joint pipeline steel tube-making process, current domestic employing for groove ruler inside and outside milling limit
Very little substantially divide equally, tube-making process that inside and outside submerged arc three wire bond, gage of wire are impartial, but outside weld reinforcement superelevation, weld seam often occur
There is the technological problems of fish back in outward appearance.Due to by material and influence of wall thickness, interior outside weld uses three wire bonds, and slope inside and outside milling limit
Mouth is the most impartial, but due to JCOE moulding process so that there is pre-weld seam together in outer groove, outer groove size will be inclined
Little so that the phenomenon that weld width is narrower, the highest, edge is uneven, largely effect on welding and anticorrosive quality.
Summary of the invention
It is an object of the invention to provide a kind of pipe line steel tubulation welding procedure, this technique is joined by optimizing milling side slope mouth
Number, welding conditions and welding wire coupling, can improve the aesthetics of welding quality and weld seam.
Pipe line steel tubulation welding procedure, it is characterised in that: this processing step is as follows:
(1) bilateral X-type groove opened by pipe line steel steel plate, and inside and outside bevel angle 45 °, root face size Control is in 5.0mm～6.0mm, milling
Rear outer groove chamfer length 2mm～3mm bigger than internal groove chamfer length；
(2) then mother metal in the range of each 50mm in pipe line steel edges of boards both sides eliminates rust；
(3) prewelding: use the Ar+CO of pulse welding power supply2Mixed gas arc welding；Welding condition is: weldingvoltage 22
～26V, welding current 700A～800A, speed of welding 3.5m/min～4.0m/min, thermal weld stress amount controls at 2.6KJ/
Cm～3.3KJ/cm, shield gas flow rate 75L/min～85L/min, coupling is not less than the solid core welding wire of strength of parent；
(4) astute and able: to use multiplewire submerged arc welding, welding sequence is interior postwelding outside weld, and gage of wire is unequal, and interior weldering uses little
Welding conditions, outside weld use big welding conditions, and thermal weld stress controls at 27KJ/cm～30KJ/cm, and submerged-arc welding coupling is the lowest
Solid core welding wire and sintered flux in strength of parent.
The wall thickness range of pipe line steel steel plate is: 12mm≤wall thickness≤15mm
Rust cleaning described in step (2) is to be removed by the rust on 50mm scope mother metal surface, steel plate both sides clean with wire brush so that it is
Expose metallic luster.
Ar+CO described in step (3)2Mixed gas arc welding technique uses pulse welding power supply.
Astute and able employing multiplewire submerged arc welding described in step (4) refers to inside and outside submerged-arc welding and all uses four wire bonds, before interior outside weld
Rear filament diameter differs, and one, two is 4mm, and three, four is 2.4mm.
The positive effect of the present invention is:
1, weld reinforcement is controlled within 2.5mm by the present invention, both ensure that the mechanical property of weld seam, has the most effectively improved weld seam
Exterior appearance, eliminate fish back.
2, the present invention is effectively guaranteed inherent quality and the mechanical property of weld seam, weld seam and HAZ impact flexibility at-20 DEG C
Shi Junneng reaches more than 100J.
3, present invention reduces anticorrosion cost, and production cost is low, the suitability is strong, it is simple to popularization and application.
Detailed description of the invention
The detailed description of the invention of the present invention is further illustrated below in conjunction with specific embodiment.
Embodiment one
(1) choosing steel pipe of pipe line steel specification is 914 × 12.5, material L415M；Inside and outside bevel angle 45 °, root face size 5mm,
Outer groove chamfer length 2mm bigger than internal groove chamfer length after milling；
(2) rust on mother metal surface in the range of the 50mm of steel plate both sides is removed dry by the Pipeline Steel Plate wire brush first step obtained
Only so that it is expose metallic luster；
(3) prewelding: use the Ar+CO of pulse welding power supply2Mixed gas arc welding, Ar and CO2Percent by volume be 80%:
20%；Welding condition is: weldingvoltage 24V, welding current 700A, speed of welding 4.0m/min, thermal weld stress amount
2.8KJ/cm, shield gas flow rate 75L/min～85L/min；The welding wire used is CHW-50C8, diameter 3.0mm.
(4) astute and able: to use four submerged-arc weldings, welding sequence is interior postwelding outside weld, and interior outside weld one, two is 4mm, three,
Four is 2.4mm.Interior outside weld welding conditions are as follows:
Table 1 914 × 12.5 welding conditions
Postwelding weld appearance molding is good, inside and outside welding line reinforcement 2.2.mm, and latent defect is few, without fish back；Weld seam and HAZ
Impact absorbing energy (-20 DEG C) average at more than 100J.
Embodiment two
(1) choosing steel pipe of pipe line steel specification is 610 × 14.2, material L450M；Inside and outside bevel angle 45 °, root face size
5.5mm, outer groove chamfer length 3mm bigger than internal groove chamfer length after milling；
(2) mother metal in the range of each 50mm in the pipe line steel edges of boards both sides first step obtained eliminates rust；
(3) prewelding: use the Ar+CO of pulse welding power supply2Mixed gas arc welding, Ar and CO2Percent by volume be 80%:
20%；Welding condition is: weldingvoltage 24V, welding current 800A, speed of welding 3.5m/min, thermal weld stress amount
3.3KJ/cm, shield gas flow rate 75L/min～85L/min；The welding wire used is CHW-50C8, diameter 3.0mm.
(4) astute and able: to use four submerged-arc weldings, welding sequence is interior postwelding outside weld, and interior outside weld one, two is 4mm, three,
Four is 2.4mm.Interior outside weld welding conditions are as follows:
Table 2 610 × 14.2 welding conditions
Postwelding weld appearance molding is good, inside and outside welding line reinforcement 2.0mm, and latent defect is few, without fish back；Weld seam and HAZ
Impact absorbing energy (-20 DEG C) average at more than 100J.
Embodiment three
(1) choosing steel pipe of pipe line steel specification is 914 × 14.27, material L415；Inside and outside bevel angle 45 °, root face size
5.5mm, outer groove chamfer length 3mm bigger than internal groove chamfer length after milling；
(2) mother metal in the range of each 50mm in the pipe line steel edges of boards both sides first step obtained eliminates rust；
(3) prewelding: use the Ar+CO of pulse welding power supply2Mixed gas arc welding, Ar and CO2Percent by volume be 80%:
20%；Welding condition is: weldingvoltage 24V, welding current 800A, speed of welding 3.5m/min, thermal weld stress amount
3.3KJ/cm, shield gas flow rate 75L/min～85L/min；The welding wire used is CHW-50C8, diameter 3.0mm.
(4) astute and able: to use four submerged-arc weldings, welding sequence is interior postwelding outside weld, and interior outside weld one, two is 4mm, three,
Four is 2.4mm.Interior outside weld welding conditions are as follows:
Table 3 914 × 14.27 welding conditions
Postwelding weld appearance molding is good, inside and outside welding line reinforcement 2.0mm, and latent defect is few, without fish back；Weld seam and HAZ
Impact absorbing energy (-20 DEG C) average at more than 100J.
Claims (5)
1. pipe line steel tubulation welding procedure, it is characterised in that: this processing step is as follows:
(1) bilateral X-type groove opened by pipe line steel steel plate, and inside and outside bevel angle 45 °, root face size Control is in 5.0mm～6.0mm, milling
Rear outer groove chamfer length 2mm～3mm bigger than internal groove chamfer length；
(2) then mother metal in the range of each 50mm in pipe line steel edges of boards both sides eliminates rust；
(3) prewelding: use the Ar+CO of pulse welding power supply2Mixed gas arc welding；Welding condition is: weldingvoltage 22～
26V, welding current 700A～800A, speed of welding 3.5m/min～4.0m/min, thermal weld stress amount controls at 2.6KJ/cm
～3.3KJ/cm, shield gas flow rate 75L/min～85L/min, coupling is not less than the solid core welding wire of strength of parent；
(4) astute and able: to use multiplewire submerged arc welding, welding sequence is interior postwelding outside weld, and gage of wire is unequal, and interior weldering uses little
Welding conditions, outside weld use big welding conditions, and thermal weld stress controls at 27KJ/cm～30KJ/cm, and submerged-arc welding coupling is the lowest
Solid core welding wire and sintered flux in strength of parent.
Pipe line steel tubulation welding procedure the most according to claim 1, it is characterised in that: the wall thickness range of pipe line steel steel plate
For: 12mm≤wall thickness≤15mm.
Pipe line steel tubulation welding procedure the most according to claim 2, it is characterised in that: the rust cleaning described in step (2) is to use
The rust on 50mm scope mother metal surface, steel plate both sides is removed clean by wire brush so that it is expose metallic luster.
Pipe line steel tubulation welding procedure the most according to claim 2, it is characterised in that: the Ar+CO described in step (3)2Mixing
Gas shielded welding progress uses pulse welding power supply.
Pipe line steel tubulation welding procedure the most according to claim 2, it is characterised in that: the astute and able employing described in step (4)
Multiplewire submerged arc welding refers to inside and outside submerged-arc welding and all uses four wire bonds, and before and after interior outside weld, filament diameter differs, and one, two is 4mm,
Three, four is 2.4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271319.7A CN105728911A (en) | 2016-04-28 | 2016-04-28 | Process for welding steel pipes of pipelines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271319.7A CN105728911A (en) | 2016-04-28 | 2016-04-28 | Process for welding steel pipes of pipelines |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105728911A true CN105728911A (en) | 2016-07-06 |
Family
ID=56287414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610271319.7A Pending CN105728911A (en) | 2016-04-28 | 2016-04-28 | Process for welding steel pipes of pipelines |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107813036A (en) * | 2016-09-13 | 2018-03-20 | 张盘 | A kind of two-sided single track buried arc welding method of cut deal mariages |
| CN108747216A (en) * | 2018-06-01 | 2018-11-06 | 江阴市三和重工钢制品有限公司 | The manufacturing process of No. 35 steel submerged-arc welded (SAW) pipes of wear-resisting dredging |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN111872522A (en) * | 2020-07-14 | 2020-11-03 | 中石化石油机械股份有限公司沙市钢管分公司 | Submerged-arc welding process for acid-resistant pipe |
| CN113798788A (en) * | 2021-09-01 | 2021-12-17 | 渤海造船厂集团有限公司 | Allowance-free one-step forming method for large-thickness small-curvature high-strength steel cylinder |
Citations (7)
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|---|---|---|---|---|
| US4258242A (en) * | 1978-06-30 | 1981-03-24 | Shigeo Fujimori | Welding process for production of a steel pipe |
| JPH05261568A (en) * | 1992-03-23 | 1993-10-12 | Nippon Steel Corp | Production of clad steel pipe |
| CN101648311A (en) * | 2008-08-15 | 2010-02-17 | 中国海洋石油总公司 | Method for welding submarine pipelines |
| CN102950432A (en) * | 2012-11-16 | 2013-03-06 | 中国石油集团渤海石油装备制造有限公司 | Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method |
| CN104889527A (en) * | 2015-06-12 | 2015-09-09 | 中石化石油工程机械有限公司沙市钢管厂 | Pipeline steel pipe welding technology |
| CN105171208A (en) * | 2015-10-22 | 2015-12-23 | 中国石油集团渤海石油装备制造有限公司 | Prewelding method of thin-wall longitudinal submerged-arc welded (LSAW) pipes with small bore diameter |
| CN105171207A (en) * | 2015-10-19 | 2015-12-23 | 中国石油集团渤海石油装备制造有限公司 | Welding method of X80 steel grade steel pipe with wall thickness of 22 mm |
-
2016
- 2016-04-28 CN CN201610271319.7A patent/CN105728911A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4258242A (en) * | 1978-06-30 | 1981-03-24 | Shigeo Fujimori | Welding process for production of a steel pipe |
| JPH05261568A (en) * | 1992-03-23 | 1993-10-12 | Nippon Steel Corp | Production of clad steel pipe |
| CN101648311A (en) * | 2008-08-15 | 2010-02-17 | 中国海洋石油总公司 | Method for welding submarine pipelines |
| CN102950432A (en) * | 2012-11-16 | 2013-03-06 | 中国石油集团渤海石油装备制造有限公司 | Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method |
| CN104889527A (en) * | 2015-06-12 | 2015-09-09 | 中石化石油工程机械有限公司沙市钢管厂 | Pipeline steel pipe welding technology |
| CN105171207A (en) * | 2015-10-19 | 2015-12-23 | 中国石油集团渤海石油装备制造有限公司 | Welding method of X80 steel grade steel pipe with wall thickness of 22 mm |
| CN105171208A (en) * | 2015-10-22 | 2015-12-23 | 中国石油集团渤海石油装备制造有限公司 | Prewelding method of thin-wall longitudinal submerged-arc welded (LSAW) pipes with small bore diameter |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107813036A (en) * | 2016-09-13 | 2018-03-20 | 张盘 | A kind of two-sided single track buried arc welding method of cut deal mariages |
| CN108747216A (en) * | 2018-06-01 | 2018-11-06 | 江阴市三和重工钢制品有限公司 | The manufacturing process of No. 35 steel submerged-arc welded (SAW) pipes of wear-resisting dredging |
| CN110788456A (en) * | 2019-10-24 | 2020-02-14 | 番禺珠江钢管（珠海）有限公司 | Multi-wire submerged arc welding process with low weld seam surplus height for thin-wall steel pipe |
| CN111872522A (en) * | 2020-07-14 | 2020-11-03 | 中石化石油机械股份有限公司沙市钢管分公司 | Submerged-arc welding process for acid-resistant pipe |
| CN113798788A (en) * | 2021-09-01 | 2021-12-17 | 渤海造船厂集团有限公司 | Allowance-free one-step forming method for large-thickness small-curvature high-strength steel cylinder |
| CN113798788B (en) * | 2021-09-01 | 2023-07-11 | 渤海造船厂集团有限公司 | One-step forming method for large-thickness small-curvature high-strength steel cylinder without allowance |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 434000 Jingzhou, Hubei, Sha District, Beijing East Road, No. 2 Applicant after: SHASHI STEEL PIPE BRANCH OF SINOPEC PETROLEUM MACHINERY CO.,LTD. Address before: 434000 Jingzhou, Hubei, Sha District, Beijing East Road, No. 2 Applicant before: SHASHI STEEL PIPE FACTORY, SINOPEC PETROLEUM ENGINEERING MACHINERY CO.,LTD. |
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| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20170926 Address after: 434000 No. 2, Beijing East Road, Hubei, Jingzhou Applicant after: SHASHI STEEL PIPE BRANCH OF SINOPEC PETROLEUM MACHINERY CO.,LTD. Applicant after: SINOPEC OILFIELD EQUIPMENT Corp. Address before: 434000 Jingzhou, Hubei, Sha District, Beijing East Road, No. 2 Applicant before: SHASHI STEEL PIPE BRANCH OF SINOPEC PETROLEUM MACHINERY CO.,LTD. |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160706 |