CN105364426A - Method for preparing thick-wall high-frequency welded steel tube - Google Patents
Method for preparing thick-wall high-frequency welded steel tube Download PDFInfo
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- CN105364426A CN105364426A CN201510948023.XA CN201510948023A CN105364426A CN 105364426 A CN105364426 A CN 105364426A CN 201510948023 A CN201510948023 A CN 201510948023A CN 105364426 A CN105364426 A CN 105364426A
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- 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
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Abstract
The invention discloses a method for preparing a thick-wall high-frequency welded steel tube. The thickness of the steel tube is 28 mm. The preparation method includes the following steps that 1, a hot-rolled coil plate is unreeled and cut; 2, row rollers are formed; 3, seams are pre-welded; 4, welding forming is conducted; 5, the welded seams are treated and cooled; 6, the welded seams are subjected to heat treatment; 7, finishing, inspecting and putting in storage are carried out. By means of the method for preparing the thick-wall high-frequency welded steel tube, the overall strength and low-temperature-resistant toughness of the thick-wall welded tube are improved by forming the row rollers, pre-welding the seams and conducting postweld heat treatment, the existence of welded seam cracking or welded seam tension is avoided, and the overall performance of the thick-wall steel tube is guaranteed.
Description
Technical field
The present invention relates to welded still pipe field, particularly relate to a kind of preparation method of heavy wall high-frequency welded steel pipe.
Background technology
Thick walled steel tube typically refers to the steel pipe of pipe thickness at more than 20mm, be for the 20mm wall thickness of domestic production within steel pipe.Thick walled steel tube is mainly used in transportation pipe spool, slurry pipeline steel pipe, petroleum casing pipe and structure pipe, square and rectangular pipe.
The impact of welding parameter and intermediate frequency simulation normalizing parameter when the performance of thick walled steel tube is mainly subject to the mouldability of shaping load, edges of boards and welds, its timber intensity is high, resilience is just very large, so the little prerequisite being impact and welding rear steel pipe stability of socket opening after being shaped, otherwise the steel pipe after welding is easy to weld seam to tear.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of preparation method of heavy wall high-frequency welded steel pipe, can effectively reduce steel pipe base shaping after mouth of pipe size, ensure thick walled steel tube welding after overall performance.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: the preparation method providing a kind of heavy wall high-frequency welded steel pipe, the thickness of described steel pipe is 28mm, and described preparation method comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting, obtain single welded pipe blank after being unreeled by hot-rolled coil by the coiled sheet width of thick walled steel tube, milling limit width requirement;
(2) row-roll forming process: adopt minor diameter row roller forming machine to adopt 6 methods to be bent into radial misalignment opening socket the sheet material after shearing in step (1), then adjust size rolls and correct roll location, making opening socket joint close;
(3) prewelding joint close: adopt Prewelding machine prewelding joint close;
(4) welding fabrication: utilize the High Frequency Solid State source of welding current that the pipe of postwelding pre-in step (3) is welded into socket;
(5) weld seam process and cooling: remove the weld seam burr inside and outside welding socket, then carry out with low temperature compressed air process of jetting and lower the temperature;
(6) weld seam heat treatment: carry out normalized treatment with welding socket cooled in induction heater step (5);
(7) repair, check, put in storage.
In a preferred embodiment of the present invention, in described step (4), the process conditions of described welding fabrication are: bonding power 1500 ~ 2000kW, bonding speed 12 ~ 15m/min, welding temperature 1500 ~ 1550 DEG C, extruding allowance 16 ~ 18mm, welding current 15 ~ 18A.
In a preferred embodiment of the present invention, in described step (5), described compressed-air actuated pressure is 10 ~ 20Kpa, and temperature is 5 ~ 10 DEG C.
In a preferred embodiment of the present invention, in described step (6), the condition of described normalized treatment is: heating frequency 50 ~ 60kHz, heating-up temperature 950 ~ 1050 DEG C, constant temperature keeps 5 ~ 15min, then cools to 300 DEG C with the furnace, Air flow 10 ~ 15min again, last water-cooled is to room temperature.
The invention has the beneficial effects as follows: the preparation method of a kind of heavy wall high-frequency welded steel pipe of the present invention, adopt row-roll forming process, prewelding joint close and post weld heat treatment, improve the bulk strength of heavy wall welded pipe and low temperature resistant toughness, avoid the existence of weld cracking or weld seam tension force, ensure the overall performance of thick walled steel tube.
Detailed description of the invention
Below preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
The embodiment of the present invention comprises:
Embodiment 1
Present invention is disclosed a kind of preparation method of heavy wall high-frequency welded steel pipe, the specification of described steel pipe is: diameter 35mm, pipe thickness 28mm, and described preparation method comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, slitting is carried out by the coiled sheet width of thick walled steel tube, milling limit width requirement after being unreeled by hot-rolled coil, obtain single welded pipe blank, and ensure that steel billet has enough shaping surpluses, welding surplus, amount of compression and edge milling amount;
(2) row-roll forming process: adopt minor diameter row roller forming machine to adopt 6 methods to be bent into radial misalignment opening socket the sheet material after shearing in step (1), then adjust size rolls and correct roll location, making opening socket joint close;
(3) prewelding joint close: adopt Prewelding machine welding at prewelding power 500kW, weldering pre speed 15min/min, prewelding temperature 1400 DEG C, make the opening joint close of steel billet;
(4) welding fabrication: utilize the High Frequency Solid State source of welding current that the pipe of postwelding pre-in step (3) is welded into socket; The process conditions of described welding fabrication are: bonding power 1500kW, bonding speed 12m/min, welding temperature 1550 DEG C, extruding allowance 16mm, welding current 15A;
(5) weld seam process and cooling: remove the weld seam burr inside and outside welding socket, wherein, inner burr push rod ejects, and be then 10Kpa with pressure, temperature is that the compressed air of 5 DEG C is jetted, to remove burr, butt welded seam carries out cooling and processes simultaneously;
(6) weld seam heat treatment: adopt medium frequency induction heater butt welded seam to carry out simulation normalized treatment, to eliminate the internal stress and rolled hardening that produce because weld seam cools rapidly in welding process, improve weld metal zone plasticity, improve or eliminate the inequality of composition and tissue in welding; The condition of described normalized treatment is: heating frequency 50kHz, heating-up temperature 950 DEG C, and constant temperature keeps 5min, then cools to 300 DEG C with the furnace, then Air flow 10 ~ 15min, and last water-cooled is to room temperature;
(7) repair, check, put in storage.
Embodiment 2
Present invention is disclosed a kind of preparation method of heavy wall high-frequency welded steel pipe, the specification of described steel pipe is: diameter 35mm, pipe thickness 28mm, and described preparation method comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, slitting is carried out by the coiled sheet width of thick walled steel tube, milling limit width requirement after being unreeled by hot-rolled coil, obtain single welded pipe blank, and ensure that steel billet has enough shaping surpluses, welding surplus, amount of compression and edge milling amount;
(2) row-roll forming process: adopt minor diameter row roller forming machine to adopt 6 methods to be bent into radial misalignment opening socket the sheet material after shearing in step (1), then adjust size rolls and correct roll location, making opening socket joint close;
(3) prewelding joint close: adopt Prewelding machine welding at prewelding power 800kW, weldering pre speed 20min/min, prewelding temperature 1400 DEG C, make the opening joint close of steel billet;
(4) welding fabrication: utilize the High Frequency Solid State source of welding current that the pipe of postwelding pre-in step (3) is welded into socket; The process conditions of described welding fabrication are: bonding power 2000kW, bonding speed 15m/min, welding temperature 1500 DEG C, extruding allowance 18mm, welding current 15A;
(5) weld seam process and cooling: remove the weld seam burr inside and outside welding socket, wherein, inner burr push rod ejects, and be then 20Kpa with pressure, temperature is that the compressed air of 10 DEG C is jetted, to remove burr, butt welded seam carries out cooling and processes simultaneously;
(6) weld seam heat treatment: adopt medium frequency induction heater butt welded seam to carry out simulation normalized treatment, to eliminate the internal stress and rolled hardening that produce because weld seam cools rapidly in welding process, improve weld metal zone plasticity, improve or eliminate the inequality of composition and tissue in welding; The condition of described normalized treatment is: heating frequency 60kHz, heating-up temperature 1050 DEG C, and constant temperature keeps 5min, then cools to 300 DEG C with the furnace, then Air flow 10 ~ 15min, and last water-cooled is to room temperature;
(7) repair, check, put in storage.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize description of the present invention to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (4)
1. a preparation method for heavy wall high-frequency welded steel pipe, is characterized in that, the thickness of described steel pipe is 28mm, and described preparation method comprises the steps:
(1) hot-rolled coil unreels shearing: according to the dimensional requirement of welded pipe, carries out slitting, obtain single welded pipe blank after being unreeled by hot-rolled coil by the coiled sheet width of thick walled steel tube, milling limit width requirement;
(2) row-roll forming process: adopt minor diameter row roller forming machine to adopt 6 methods to be bent into radial misalignment opening socket the sheet material after shearing in step (1), then adjust size rolls and correct roll location, making opening socket joint close;
(3) prewelding joint close: adopt Prewelding machine prewelding joint close;
(4) welding fabrication: utilize the High Frequency Solid State source of welding current that the pipe of postwelding pre-in step (3) is welded into socket;
(5) weld seam process and cooling: remove the weld seam burr inside and outside welding socket, then carry out with low temperature compressed air process of jetting and lower the temperature;
(6) weld seam heat treatment: carry out normalized treatment with welding socket cooled in induction heater step (5);
(7) repair, check, put in storage.
2. the preparation method of heavy wall high-frequency welded steel pipe according to claim 1, it is characterized in that, in described step (4), the process conditions of described welding fabrication are: bonding power 1500 ~ 2000kW, bonding speed 12 ~ 15m/min, welding temperature 1500 ~ 1550 DEG C, extruding allowance 16 ~ 18mm, welding current 15 ~ 18A.
3. the preparation method of heavy wall high-frequency welded steel pipe according to claim 1, is characterized in that, in described step (5), described compressed-air actuated pressure is 10 ~ 20Kpa, and temperature is 5 ~ 10 DEG C.
4. the preparation method of heavy wall high-frequency welded steel pipe according to claim 1, it is characterized in that, in described step (6), the condition of described normalized treatment is: heating frequency 50 ~ 60kHz, heating-up temperature 950 ~ 1050 DEG C, constant temperature keeps 5 ~ 15min, then cools to 300 DEG C with the furnace, Air flow 10 ~ 15min again, last water-cooled is to room temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510948023.XA CN105364426A (en) | 2015-12-17 | 2015-12-17 | Method for preparing thick-wall high-frequency welded steel tube |
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| CN201510948023.XA CN105364426A (en) | 2015-12-17 | 2015-12-17 | Method for preparing thick-wall high-frequency welded steel tube |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106271432A (en) * | 2016-08-30 | 2017-01-04 | 天津鑫凯建业科技有限公司 | A kind of steel pipes with straight manufacturing process and the reel hold down gag for this technique |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
| CN112570472A (en) * | 2020-12-02 | 2021-03-30 | 中冶南方（武汉）热工有限公司 | Hot-rolled stainless steel annealing and pickling line |
| CN113020315A (en) * | 2021-03-08 | 2021-06-25 | 常熟市盈博钢管有限公司 | Method for manufacturing thin-wall chilled special pipe |
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| KR100651774B1 (en) * | 2005-12-26 | 2006-12-01 | 주식회사 포스코 | Manufacturing method of electric resistance welded steel pipe |
| CN102312075A (en) * | 2010-06-29 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for improving low-temperature impact toughness of weld joint of weld pipe welded in manner of high-frequency straight welding |
| CN104646931A (en) * | 2013-11-16 | 2015-05-27 | 无锡大金高精度冷拔钢管有限公司 | Manufacturing method of cold drawn welded pipe for precision oil cylinder |
| CN104842128A (en) * | 2015-06-08 | 2015-08-19 | 武汉钢铁(集团)公司 | Ultrahigh radius-thickness ratio high-frequency longitudinal-seam welded pipe manufacturing method |
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2015
- 2015-12-17 CN CN201510948023.XA patent/CN105364426A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100651774B1 (en) * | 2005-12-26 | 2006-12-01 | 주식회사 포스코 | Manufacturing method of electric resistance welded steel pipe |
| CN102312075A (en) * | 2010-06-29 | 2012-01-11 | 攀钢集团钢铁钒钛股份有限公司 | Method for improving low-temperature impact toughness of weld joint of weld pipe welded in manner of high-frequency straight welding |
| CN104646931A (en) * | 2013-11-16 | 2015-05-27 | 无锡大金高精度冷拔钢管有限公司 | Manufacturing method of cold drawn welded pipe for precision oil cylinder |
| CN104842128A (en) * | 2015-06-08 | 2015-08-19 | 武汉钢铁(集团)公司 | Ultrahigh radius-thickness ratio high-frequency longitudinal-seam welded pipe manufacturing method |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106271432A (en) * | 2016-08-30 | 2017-01-04 | 天津鑫凯建业科技有限公司 | A kind of steel pipes with straight manufacturing process and the reel hold down gag for this technique |
| CN110142310A (en) * | 2019-05-31 | 2019-08-20 | 常熟市盈博钢管有限公司 | A kind of production technology of steel pipes with straight |
| CN112570472A (en) * | 2020-12-02 | 2021-03-30 | 中冶南方（武汉）热工有限公司 | Hot-rolled stainless steel annealing and pickling line |
| CN113020315A (en) * | 2021-03-08 | 2021-06-25 | 常熟市盈博钢管有限公司 | Method for manufacturing thin-wall chilled special pipe |
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Application publication date: 20160302 |
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