CN103481032B - A kind of large thick-wall sulfur resistive tower barrel forming-welding technology - Google Patents
A kind of large thick-wall sulfur resistive tower barrel forming-welding technology Download PDFInfo
- Publication number
- CN103481032B CN103481032B CN201310438356.9A CN201310438356A CN103481032B CN 103481032 B CN103481032 B CN 103481032B CN 201310438356 A CN201310438356 A CN 201310438356A CN 103481032 B CN103481032 B CN 103481032B
- Authority
- CN
- China
- Prior art keywords
- welding
- category
- weld seam
- seam
- tower barrel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/14—Bending sheet metal along straight lines, e.g. to form simple curves by passing between rollers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a kind of large thick-wall sulfur resistive tower barrel forming-welding technology, adopt the shaping scheme of warm rolling, under steel plate being heated to 600 ~ 620 DEG C of temperature, carry out roll-forming; By controlling welding material impurity content and adopting weld preheating, adjustment welding sequence, postwelding disappears a series of technical measures such as hydrogen process or the heat treatment of postwelding stress-removal, every mechanical property that production joint is met the demands and hic resistance and SSC performance.Good effect of the present invention is: can shorten the heat time; Operate simpler; Steel plate Reducing thickness and elongation can be reduced; Oxide skin is few; Steel plate can be made to obtain slightly large plasticity; The possibility of veneer reeling machine overload can be reduced; The danger of brittle failure can be reduced; Bevel angle is little; Adopt double wire welding, speed is fast; Because groove is less, can welding stress be reduced, welding point cracking resistance can be improved; Automaticity is high, and welder is easy to operate.
Description
Technical field
The present invention relates to that large thick-wall sulfur resistive tower barrel is shaping, solder technology, particularly relating to a kind of material is Q345R (R-HIC), and specification is roll-forming and the welding procedure of the large thick-wall sulfur resistive tower barrel of DN6200 × 200.
Background technology
One of key equipment as the maximization tower in 3,500,000 tons/year of natural gas liquefaction devices: in desulfurization and decarburization device, the equipment size parameter on desulfurization and decarburization absorption tower and process operation parameter are in table 1.
Table 1 equipment size parameter and process operation parameter
Desulfurization and decarburization absorption tower is III class large thick-wall pressure vessel.The critical piece of equipment: the material of cylindrical shell is Q345R (R-HIC) normalizing plate, and wall thickness is 200mm, cylinder internal diameter φ 6200mm, the total length 36900mm of cylindrical shell.It is high that cylindrical shell manufactures not only technical requirement, and manufacture difficulty is large.Especially the roll-forming of cylindrical shell, welding, the technology that P7.92MPaDN6200 large thick-wall sulfur resistive tower barrel is shaping, weld need be developed, to fill up the shaping blank without ripe rolling technology, welding procedure of current P7.92MPaDN6200 large thick-wall sulfur resistive tower barrel.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art, the invention provides a kind of large thick-wall sulfur resistive tower barrel forming-welding technology.
The technical solution adopted for the present invention to solve the technical problems is: a kind of large thick-wall sulfur resistive tower barrel forming-welding technology, comprises the steps:
Step one, shell rolling moulding process:
(1) lower stockline is drawn according to pattern;
(2) edge chamfering;
Warm process in (3) 600 DEG C ~ 620 DEG C, being incubated warm rolling system in enforcement of coming out of the stove immediately for 5 hours;
(4) warm rolling system in: warm rolling system in carrying out on veneer reeling machine;
(5) line cutting stub bar;
(6) on veneer reeling machine, roll gathering for full circle, and use model passed examination;
(7) category-A weld seam is combined: unfitness of butt b≤10mm;
(8) A seam welding: each one of cylindrical shell longitudinal seam left and right end band Product jointing test plate (panel), welding simultaneously;
(9) category-A weld seam process defect detecting test: weld seam welding carries out 100RT defect detecting test to during 1/3 ~ 1/5 thickness of slab;
(10) category-A joint close presentation quality checks;
(11) category-A seam inspection: 100% ray detection and 100% ultrasound detection are carried out to category-A weld seam;
(12) in Wen Jiaoyuan: be heated to 620 DEG C insulation 5 hours after come out of the stove immediately implement in Wen Jiaoyuan, guarantee circularity e≤25mm, corner angle E≤5.0mm, diameter tolerance ± 5mm;
(13) category-A joint close presentation quality check;
(14) category-A weld seam is detected a flaw again: carry out 100% ray detection and 100% ultrasound detection to category-A weld seam;
Step 2, barrel soldering technique:
(1) vertical, the circumferential weld of product adopts double strings narrow chink slugging arc welding, takes over the D class weld seam be connected with housing and adopts shape of a saddle submerged arc welding;
(2) asymmetric two-sided Narrow sloping-glot welding is adopted;
(3) S, P impurity content≤0.025% in welding material;
(4) carry out more than 150 DEG C preheatings at least 1 times, groove both sides thickness range before weldering, be incubated 3 ~ 4 hours, between controlling in welding process, temperature is below 200 DEG C;
(5), when postwelding or centre need to suspend welding, all should postwelding be carried out disappear hydrogen process or enter stove and carry out hidden lino removal by butt welded seam immediately;
(6) weld hardness≤200HB after finished heat treatment.
Compared with prior art, good effect of the present invention is:
One, shaping aspect: the present invention adopts the shaping scheme of warm rolling, carries out roll-forming under being heated to 600 ~ 620 DEG C of temperature by steel plate.
Its good effect is compared with hot rolling:
1) can the heat time be shortened, reduce energy consumption, cost-saving;
2) operator is more close, and operation is comparatively simple, and hoisting and hanging is easier to;
3) can reduce steel plate Reducing thickness and elongation, dimensional accuracy is more easy to control;
4) oxide skin does not form harm less, not easily produces load mould inside and outside cylindrical shell.
Its good effect is compared with cold coiling:
1) steel plate can be made to obtain slightly large plasticity, be easy to control, raise the efficiency;
2) possibility of veneer reeling machine overload can be reduced, can device damage be prevented;
3) danger of brittle failure can be reduced, cylindrical shell quality can be ensured.
Two, welding aspect: the present invention adopts double strings narrow chink slugging arc welding scheme, its good effect is compared with traditional submerged-arc welding:
1) bevel angle is little, and deposited metal is few, can save wlding, reduce electric energy;
2) adopt double wire welding, speed is fast, and efficiency is high, can reduce costs, the reduction of erection time;
3) because groove is less, can welding stress be reduced, welding point cracking resistance can be improved;
4) automaticity is high, and welder is easy to operate.
Detailed description of the invention
A kind of large thick-wall sulfur resistive tower barrel forming-welding technology, comprises the steps:
Step one, shell rolling moulding process:
This step adopts the shaping scheme of warm rolling, that is: steel plate is heated to 600 DEG C ~ 620 DEG C.Roll at this temperature, steel plate both can have been made to obtain the plasticity slightly larger than cold conditions, reduced the possibility of veneer reeling machine overload, the danger of cold coiling brittle failure can be reduced again.Oxide skin does not also form harm, operates also more convenient.Overcome the defect of hot and cold volume, double advantage of getting hot and cold volume.Concrete grammar is as follows:
(1) lower stockline is drawn according to pattern:
1) cutting length L determines by following formula:
L＝π×Dm-△L
In formula: Dm represents cylindrical shell central diameter, △ L represents and rolls elongation, determines by following formula:
△ L=(0.04 ~ 0.055) π × Dm × S/Di, wherein: S represents thickness of slab, Di cylinder internal diameter;
2) blanking width is strip width;
3) pre-bending chieftain surplus every about 800mm is stayed;
4) retaining wall on slope surplus is stayed;
5) make material mark by regulation and transplant.
While drawing lower stockline, pull datum line, and make mark or adopt other to be convenient to align contraposition, the convenient method checked.
(2) edge chamfering:
Adopt semi-automatic method cutting steel plate, two long arris carry out 15 × 45 ° of chamferings, then hand-sand is to presenting metallic luster.
(3) warm process in:
Specify to carry out the heat treatment in 600 DEG C ~ 620 DEG C before warm rolling system by Technology for Heating Processing, be incubated enforcement of coming out of the stove immediately for 5 hours and roll.
(4) warm rolling system in:
The safety measure of job site, veneer reeling machine equipment is carried out, warm rolling system during cold coiling 240 ~ 280mm veneer reeling machine carries out before rolling.
Veneer reeling machine lower roller center distance can by veneer reeling machine parameter from Row sum-equal matrix, when inconsistent with following example, can go out the value of total volume under pressure by setting out survey, carries out rolling with reference to the distribution number of times of lower example and volume under pressure.
Be example by veneer reeling machine lower roller center distance 1600mm, the total volume under pressure of upper axle is about 120mm, and points about 6 times shaping to warm rolling circle in cylindrical shell: on first time, axle volume under pressure is 20mm, rolls, within about 13 minutes, complete to roll speed 1.5m/min enforcement; In second time, axle volume under pressure is 35mm, implements to roll, within about 13 minutes, complete to roll speed 1.5m/min; On third time, axle volume under pressure is 35mm, implements to roll, within about 13 minutes, complete to roll speed 1.5m/min; 4th time upper axle volume under pressure is 20mm, implements to roll, within about 13 minutes, complete to roll speed 1.5m/min; 5th time upper axle volume under pressure is 5mm, implements to roll, within about 13 minutes, complete to roll speed 1.5m/min; 6th time upper axle volume under pressure is 5mm, implements to roll, within about 13 minutes, complete to roll speed 1.5m/min.
(5) line cutting stub bar:
The line of cut of unnecessary chieftain's material (straight section, about 800mm) after drawing cylindrical shell pre-bending chieftain by figure, cylinder internal diameter dimensional discrepancy is ± 3mm, draws the lower stockline of test plate (panel) two pair by test plate (panel) figure; Draw stockline under mother metal test plate (panel): 260 × 300,1.By line cutting stub bar, cutting test plate (panel) carbon plane, slagging-off etc.; Hand-sand category-A groove, groove face polishing is level and smooth.Groove face carries out 100% Magnetic testing, and need reach I grade of criterion of acceptability of JB/T4730 regulation.
(6) cold coiling draws in:
Cold coiling 240 ~ 280mm veneer reeling machine carries out roll and draw in as full circle, and use model passed examination.
(7) category-A weld seam is combined:
By pattern combination category-A weld seam, unfitness of butt b≤10mm (GB150 standard: b≤1/16 δ s
(, and≤10mm, δ s-thickness of slab).
(8) A seam welding:
Welding is carried out, weld preheating process by pattern and welding process requirement.Each one of cylindrical shell longitudinal seam left and right end band Product jointing test plate (panel), welding simultaneously.(welding process strictly controls welding deformation, takes inside and outside alternately welding to wait measure to prevent).
(9) category-A weld seam process defect detecting test:
Weld seam welding carries out 100RT defect detecting test to time about 1/3 ~ 1/5 thickness of slab (weld joint on inner side preferably can flush mother metal), and by JB/T4730-2005 standard, X-ray Testing Technology grade is not less than AB level, and qualified rank is II grade.
After the flaw detection of category-A weld seam process is qualified, then undertaken welding full category-A weld seam by pattern and welding process requirement.
(10) category-A joint close presentation quality checks:
Butt welded seam presentation quality and geomery are tested.
(11) category-A seam inspection:
Category-A weld seam carries out 100% ray detection, and by JB/T4730-2005 standard, X-ray Testing Technology grade is not less than AB level, and qualified rank is II grade.
Category-A weld seam carries out 100% ultrasound detection, and by JB/T4730-2005 standard, pulse reflection method ultrasonic detecting technology grade is not less than B level, and qualified rank is I grade.
(12) Wen Jiaoyuan in:
By Technology for Heating Processing carry out middle temperature heating, be namely heated to 620 DEG C insulation 5 hours after come out of the stove immediately implement in Wen Jiaoyuan (checking with model).Circularity e≤25mm (standard: e≤1%Di and be not more than 25mm); E≤5.0m (GB150 standard: corner angle E≤(δ s/10+2) mm, and be not more than 5mm); Diameter tolerance ± 5mm.
(13) category-A joint close presentation quality check:
Inspector's butt welded seam presentation quality and geomery are tested.
(14) category-A weld seam is detected a flaw again
Category-A weld seam carries out 100% ray detection, and by JB/T4730-2005 standard, X-ray Testing Technology grade is not less than AB level, and qualified rank is II grade.
Category-A weld seam carries out 100% ultrasound detection, and by JB/T4730-2005 standard, pulse reflection method ultrasonic detecting technology grade is not less than B level, and qualified rank is I grade.
Step 2, barrel soldering technique:
This step is mainly through controlling welding material impurity content, with employing weld preheating, the input of Control Welding Process heat, adjustment welding sequence, postwelding disappears a series of technical measures such as hydrogen process or the heat treatment of postwelding stress-removal, every mechanical property that production joint is met the demands and hic resistance and SSC performance, can be used for the welding of heavy wall sulfur resistive tower and sulfur resistive material of the same type.Concrete grammar is as follows:
(1) vertical, the circumferential weld (A, category-B) of product adopts double strings narrow chink slugging arc welding, takes over the D class weld seam be connected with housing and adopts shape of a saddle submerged arc welding, so that enhance productivity.Simultaneously according to weldment structure situation, in order to reduce welding deformation, two-sided alternately welding also can be adopted.
(2) according to welding equipment feature, adopt the welding of asymmetric two-sided Narrow sloping-glot, welding loading and welding stress and distortion can be reduced like this.
(3) strictly control the impurity contents (S+P≤0.025%) such as welding material S, P, wlding is selected according to the principle of equal strength.In order to reduce the impact of manufacturing process repeatedly heat treatment properties of weld, the welding material of high coupling also can be selected.
(4) carry out more than 150 DEG C preheatings at least 1 times, groove both sides thickness range before weldering, be incubated 3 ~ 4 hours to ensure that mother metal is heated evenly, unanimously, between controlling in welding process, temperature is below 200 DEG C for inside and outside temperature, is the highlyest no more than 230 DEG C.
(5) guarantee in welding process not produce the defects such as slag inclusion, pore and crackle.
(6), when postwelding or centre need to suspend welding, all should postwelding be carried out disappear hydrogen process or enter stove and carry out hidden lino removal by butt welded seam immediately; Forbid after finished heat treatment, in equipment surface any position striking, avoiding arc scratch.
(7) control weld hardness, after finished heat treatment, answer≤200HB.
Claims (4)
1. a large thick-wall sulfur resistive tower barrel forming-welding technology, is characterized in that: comprise the steps:
Step one, shell rolling moulding process:
(1) lower stockline is drawn according to pattern;
(2) edge chamfering;
Warm process in (3) 600 DEG C ~ 620 DEG C, being incubated warm rolling system in enforcement of coming out of the stove immediately for 5 hours;
(4) warm rolling system in: warm rolling system in carrying out on veneer reeling machine;
(5) line cutting stub bar;
(6) on veneer reeling machine, roll gathering for full circle, and use model passed examination;
(7) category-A weld seam is combined: unfitness of butt b≤10mm;
(8) A seam welding: each one of cylindrical shell longitudinal seam left and right end band Product jointing test plate (panel), welding simultaneously;
(9) category-A weld seam process defect detecting test: weld seam welding carries out 100%RT defect detecting test to during 1/3 ~ 1/5 thickness of slab;
(10) category-A joint close presentation quality checks;
(11) category-A seam inspection: 100% ray detection and 100% ultrasound detection are carried out to category-A weld seam;
(12) in Wen Jiaoyuan: be heated to 620 DEG C insulation 5 hours after come out of the stove immediately implement in Wen Jiaoyuan, guarantee circularity e≤25mm, corner angle E≤5.0mm, diameter tolerance ± 5mm;
(13) category-A joint close presentation quality check;
(14) category-A weld seam is detected a flaw again: carry out 100% ray detection and 100% ultrasound detection to category-A weld seam;
Step 2, barrel soldering technique:
(1) vertical, the circumferential weld of product adopts double strings narrow chink slugging arc welding, takes over the D class weld seam be connected with housing and adopts shape of a saddle submerged arc welding;
(2) asymmetric two-sided Narrow sloping-glot welding is adopted;
(3) S, P content of impurities≤0.025% in welding material;
(4) carry out more than 150 DEG C preheatings at least 1 times, groove both sides thickness range before weldering, be incubated 3 ~ 4 hours, between controlling in welding process, temperature is below 200 DEG C;
(5), when postwelding or centre need to suspend welding, all should postwelding be carried out disappear hydrogen process or enter stove and carry out hidden lino removal by butt welded seam immediately;
(6) weld hardness≤200HB after finished heat treatment.
2. a kind of large thick-wall sulfur resistive tower barrel forming-welding technology according to claim 1, it is characterized in that: in step one when drawing lower stockline according to pattern, cutting length L determines by following formula:
L=π×Dm-△L
In formula: Dm represents cylindrical shell central diameter, △ L represents and rolls elongation, determines by following formula:
△ L=(0.04 ~ 0.055) π × Dm × S/Di, wherein: S represents thickness of slab, Di represents cylinder internal diameter.
3. a kind of large thick-wall sulfur resistive tower barrel forming-welding technology according to claim 1, is characterized in that: in step one when to edge chamfering, carry out 15 × 45 ° of chamferings, then hand-sand is to presenting metallic luster to two long arris.
4. a kind of large thick-wall sulfur resistive tower barrel forming-welding technology according to claim 1, is characterized in that: described veneer reeling machine is 240 ~ 280mm veneer reeling machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310438356.9A CN103481032B (en) | 2013-09-24 | 2013-09-24 | A kind of large thick-wall sulfur resistive tower barrel forming-welding technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310438356.9A CN103481032B (en) | 2013-09-24 | 2013-09-24 | A kind of large thick-wall sulfur resistive tower barrel forming-welding technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103481032A CN103481032A (en) | 2014-01-01 |
| CN103481032B true CN103481032B (en) | 2016-01-20 |
Family
ID=49821811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310438356.9A Active CN103481032B (en) | 2013-09-24 | 2013-09-24 | A kind of large thick-wall sulfur resistive tower barrel forming-welding technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103481032B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103920967B (en) * | 2014-02-24 | 2016-01-20 | 中国化学工程第十四建设有限公司 | Absorption tower welding method |
| CN105057905B (en) * | 2015-08-13 | 2017-05-31 | 德阳东汽电站机械制造有限公司 | A kind of welding method of combustion engine Large Diameter Pipeline exhaust duct |
| CN111360100B (en) * | 2019-06-11 | 2022-10-04 | 绍兴银球压力容器制造有限公司 | Energy-saving compressor cooler barrel machining process |
| CN111633299B (en) * | 2020-05-15 | 2022-01-07 | 上海石化机械制造有限公司 | Manufacturing process of pressure container |
| CN113134705A (en) * | 2021-05-24 | 2021-07-20 | 上海水合环境工程有限公司 | Roundness control tool for steel vertical tank and application method thereof |
| CN115055925B (en) * | 2022-07-29 | 2024-04-19 | 重庆东憧铝业有限公司 | Plate rolling process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3764036A (en) * | 1970-12-02 | 1973-10-09 | Ametek Inc | Cryogenic liquid storage systems |
| CN103008991A (en) * | 2012-12-10 | 2013-04-03 | 衡阳风顺车桥有限公司 | Rolling method of small-bore circular tubes |
| CN202913966U (en) * | 2012-09-25 | 2013-05-01 | 中国石油天然气集团公司 | Surface casing pipe for coal-bed gas well |
| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0996399A (en) * | 1995-07-25 | 1997-04-08 | Toyoda Gosei Co Ltd | Pressure container |
| US6499646B1 (en) * | 2000-04-05 | 2002-12-31 | Indian Sugar And General Engineering Corp. | Fusion welded liquefiable gas cylinder with overpressure protection heads and method for making the same |
-
2013
- 2013-09-24 CN CN201310438356.9A patent/CN103481032B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3764036A (en) * | 1970-12-02 | 1973-10-09 | Ametek Inc | Cryogenic liquid storage systems |
| CN202913966U (en) * | 2012-09-25 | 2013-05-01 | 中国石油天然气集团公司 | Surface casing pipe for coal-bed gas well |
| CN103008991A (en) * | 2012-12-10 | 2013-04-03 | 衡阳风顺车桥有限公司 | Rolling method of small-bore circular tubes |
| CN103286414A (en) * | 2013-04-27 | 2013-09-11 | 中国石油天然气集团公司 | Welding method of oil gas transmission antisulphour steel pipelines |
Non-Patent Citations (3)
| Title |
|---|
| L245NCS抗硫管线的焊接工艺;代波;《科技创新与应用》;20121231(第28期);第133-134页 * |
| 压力容器焊接的质量控制;杨文伟;《焊接》;20050430(第4期);第44-45页 * |
| 大直径06Cr13马氏体不锈复合钢板压力容器的制造;傅华 等;《川化》;20100630(第2期);第28-33页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103481032A (en) | 2014-01-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103481032B (en) | A kind of large thick-wall sulfur resistive tower barrel forming-welding technology | |
| CN101886222B (en) | Method for manufacturing high-strength X90 steel grade spiral submerged arc welded pipe | |
| CN103934639B (en) | A kind of thin-walled cold-bending molding technology | |
| CN104148773B (en) | A kind of method controlling band large-scale metal tube sheet welding distortion | |
| CN102248372B (en) | Method for producing single-sided composite stainless steel cold rolling base stock | |
| CN102330034A (en) | X65MS steel-grade spiral welded tube for acidic corrosion environment and manufacturing method thereof | |
| CN103028631B (en) | Manufacture process of thin-wall spiral composite steel pipe | |
| CN102941423B (en) | Preparation method of aluminum alloy welding wire | |
| CN102205458B (en) | Manufacturing method for X120 steel-level spiral seam hidden arc welding tube | |
| CN105290573A (en) | Welding method of medium-sized storage tank of 1000m<3>00Cr14Ni14Si4 steel | |
| CN108500559B (en) | Manufacturing method of extra-large-pipe-diameter thick-wall X80 steel-grade spiral submerged arc welded pipe | |
| CN105880952A (en) | Production process of longitudinal submerged arc welded pipe for oil and gas transmission | |
| CN106112389A (en) | A kind of bimetallic clad steel plate elbow method of manufacturing technology | |
| CN102950432A (en) | Q245R longitudinal submerged arc welded natural gas blow-down pipe manufacturing method | |
| CN101701315B (en) | Manufacturing method of submerged pipeline steel pipe | |
| CN104625648A (en) | Technological method for machining square and rectangular pipes | |
| CN104191176A (en) | Method for manufacturing low-temperature flow weighing container | |
| CN105834697A (en) | Manufacturing method of X80 pipeline steel straight welded pipe | |
| CN102649123B (en) | Method for producing extra thick composite board through dissymmetrical composite rolling | |
| CN105525228B (en) | Nuclear safety grade 316L stainless steel gauge pipe | |
| CN102784812B (en) | Manufacturing method of X65 steel-grade HFW (High Frequency Welding) steel pipe for ore pulp conveying pipeline | |
| CN102294571A (en) | Method for manufacturing high-temperature and high-pressure steel pipe | |
| CN107639359A (en) | A kind of modified welding procedure for thick-walled vessel cylinder longitudinal joint groove | |
| CN102294380A (en) | Method for manufacturing medium-temperature and high-pressure steel pipe | |
| CN102294572A (en) | Method for manufacturing high-temperature and high-pressure steel pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20180115 Address after: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee after: China Petroleum Engineering Construction Co Ltd Address before: 610041 Chengdu high tech Zone, Sichuan province sublimation Road No. 6 Patentee before: Engineering Design Co., Ltd., China Petroleum Group |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210209 Address after: 100007 No. 9 North Main Street, Dongcheng District, Beijing, Dongzhimen Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. Address before: No. 6, Sichuan hi tech Zone, sublime Road, Chengdu, Sichuan Patentee before: CHINA PETROLEUM ENGINEERING & CONSTRUCTION Corp. |