CN101020192A - Hot rolling process of seamless steel pipe - Google Patents
Hot rolling process of seamless steel pipe Download PDFInfo
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- CN101020192A CN101020192A CN 200710027223 CN200710027223A CN101020192A CN 101020192 A CN101020192 A CN 101020192A CN 200710027223 CN200710027223 CN 200710027223 CN 200710027223 A CN200710027223 A CN 200710027223A CN 101020192 A CN101020192 A CN 101020192A
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- seamless steel
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- hollow
- rolling mill
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 238000005098 hot rolling Methods 0.000 title abstract description 3
- 238000004513 sizing Methods 0.000 claims abstract description 33
- 238000005096 rolling process Methods 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- 238000005242 forging Methods 0.000 claims description 13
- 238000009785 tube rolling Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 238000009749 continuous casting Methods 0.000 claims description 5
- 238000003303 reheating Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000002184 metal Substances 0.000 abstract description 2
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000004080 punching Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
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Abstract
The present invention relates to seamless steel pipe producing technology, and is especially hot rolling process of seamless steel pipe. The present invention adopts continuously cast circular pipe blank or circular steel ingot as material and includes the steps of material heating, cross piercing, periodically rolling, re-heating, sizing, etc to realize perforating deformation, rolling deformation and sizing deformation. The present invention has raised rough pipe wall thickness, saving in power consumption and raised metal yield.
Description
Technical field
The present invention is a kind of rolling mill practice of hot rolled seamless steel tube, belongs to the seamless steel pipe technology field that produces.
Background technology
Traditional rolling mill practice uses circle waveform steel ingot to make raw material, after being heated to 1250～1280 ℃, uses vertical (or horizontal) hydraulic press to be washed into the cup-shaped hollow billet, then heats at rotating table furnace again, wears into hollow hollow billet then on two rolling elongators.Hollow billet rolls into hollow forging through pilger mill after wearing rod on the roll line of pilger mill.Hollow forging needs in excision Pierre's wresting and after cutting, and rolls into steel pipe through heating and multimachine frame sizing mill again, enters cold bed afterwards.
In traditional rolling mill practice, because the punching of vertical (or horizontal) hydraulic press is eccentric serious, in case misoperation the product wall thickness accuracy just will occur and exceed standard.Simultaneously, owing to the operation of wearing into hollow billet is many, cause the hot-rolling metal recovery rate low, energy resource consumption is bigger.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and defective, a kind of rolling mill practice that improves hollow billet wall thickness accuracy and recovery rate of iron, energy-conservation hot rolled seamless steel tube is provided.
For reaching above-mentioned purpose, the present invention proposes a kind of rolling mill practice of hot rolled seamless steel tube, and this rolling mill practice comprises perforation, tube rolling and sizing three large deformation, specifically comprises following operation:
A. continuous casting circular tube blank or circular steel ingot raw material heating,
B. continuous casting circular tube blank that heats or circular steel ingot raw material are through roll piercing operation perforation distortion, and lengthening coefficient is not more than 2.5, and enlarging rate is not more than 5%,
C. the pilger mill operation adopts the hollow billet after pilger mill will be bored a hole to be rolled into hollow forging, and its lengthening coefficient scope is 3～9,
D. hollow forging heats again,
E. the hollow forging that will heat again becomes the steel pipe of required external diameter by the sizing mill sizing, and total reducing rate scope of sizing is 1.5%～5%,
F. finished product enters cold bed.
It is that Φ 219～760mm, wall thickness range are the hot rolled seamless steel tube of 10～130mm that this rolling mill practice is fit to produce the outer diameter of steel pipes scope.
The rolling mill practice of described a kind of hot rolled seamless steel tube, it rolls perforation process and is to use the Mannesmann piercing machine, and solid hot charge is pierced into hollow hollow billet.
The rolling mill practice of described a kind of hot rolled seamless steel tube, it is heating process again, is to use the stepping beam type reheating furnace, and hollow forging is heated to the required temperature of sizing equably.
The rolling mill practice of described a kind of hot rolled seamless steel tube, its sizing operation are to use two roller sizing mills or three roller sizing mills.
The present invention compared with prior art has following beneficial effect:
The present invention adopt that single roll piercing operation replaces the punching of former traditional vertical (or horizontal) hydraulic press, rotating table furnace heats again and three process such as two rolling elongator extensions after, the hollow billet wall thickness accuracy bring up to the hollow billet wall thickness accuracy ± 5%～10%; Can save the energy 15%; Recovery rate of iron can improve 2%.
Description of drawings
Figure is a process schematic representation of the present invention;
Symbol description among the figure
1 raw material that heats, 2 Mannesmann piercing mills, 3 pilger mills
4 reheaters, 5 sizing mills, 6 cold beds
The specific embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is further described.
As shown in the figure.
The rolling mill practice of hot rolled seamless steel tube comprises perforation (or punching), tube rolling and sizing three large deformation operations.Perforation (or punching) is first road distortion operation, and its effect is that solid raw material pierced billet (or punching out) is become tubulose " hollow billet "; Tube rolling is second road distortion operation, and its effect is tubulose " hollow billet " wall thickness to be rolled thin length simultaneously extend, and is rolled into " hollow forging " that meet the requirement of fished pipe wall thickness; Sizing is the 3rd a road distortion operation, and its effect is to guarantee that the outer diameter of steel pipes precision meets the standard code requirement; Above-mentioned three large deformation are to carry out under hot.
Rolling mill practice of the present invention comprises three large deformation operations: perforation distortion operation in first road adopts the Mannesmann piercing machine, use the perforation lengthening coefficient be not more than 2.5 " in " distortion; The second road tube rolling distortion operation adopts pilger mill, and the maximum lengthening coefficient of use tube rolling is " greatly " distortion of 9.0; The 3rd road sizing distortion operation adopts multimachine frame sizing mill, and the maximum lengthening coefficient of use sizing is " little " distortion of 1.2.This rolling mill practice comprises following production process: the raw material 1 that heats (with continuous casting circular tube blank or circular steel ingot) is through Mannesmann piercing mill 2 perforation, through pilger mill 3 tube rollings, heat, enter cold bed 6 through sizing mill 5 sizings and finished product through reheating furnace 4.It is that Φ 219～760mm, wall thickness range are the hot rolled seamless steel tube of 10～130mm that this rolling mill practice is fit to produce the outer diameter of steel pipes scope.
First road perforation (or punching out) distortion operation start rolling temperature is 1200～1250 ℃, uses 2 perforation of Mannesmann piercing machine, and it belongs to the oblique milling deformation method, and rolled piece advances while rotating, and the hot tool of use is roll, top and guide plate (or godet).The roll forming of the roll that the present invention uses is taper or barrel-shaped, guide and guard be about (or about) guide plate.The feed angle that adopts is 4 ° or 5 °, and mill speed is not more than 0.4m/s.Perforation distortion lengthening coefficient is not more than 2.5, and enlarging rate is not more than 5%.
The second road tube rolling distortion operation life cycle pipe mill, 3 tube rollings, it belongs to the forging rolling deformation method, and nearly more than 3 times, so the wall thickness reducing amount maximum can arrive 130mm, maximum lengthening coefficient is 9 to its " hollow forging " wall thickness regrate number of times.
Use stepping beam type reheating furnace 4 heating again, hollow forging is heated to 900～1050 ℃ equably.
The 3rd road sizing distortion operation, thickness of steel pipe uses multimachine frame sizing mill 5 sizings when 50mm (or 70mm) is following, and it belongs to vertical hollow rolling.The present invention adopts dual roll type or three-roller type sizing mill, and total reducing rate of use is not more than 5%.The maximum lengthening coefficient of sizing is 1.2.Finishing temperature must not be lower than 900 ℃ behind the sizing.
The hot rolled seamless steel tube that uses the present invention to produce, hollow billet wall thickness accuracy can be brought up to hollow billet wall thickness ± 5%～10%; Can save the energy 15%, recovery rate of iron can improve 2%.
Claims (4)
1. the rolling mill practice of a hot rolled seamless steel tube, this rolling mill practice comprises perforation, tube rolling and sizing three large deformation, specifically comprises following operation:
A. continuous casting circular tube blank or circular steel ingot raw material [1] heating,
B. continuous casting circular tube blank that heats or circular steel ingot raw material [1] are not more than 2.5 through Mannesmann piercing mill [2] lengthening coefficient, and enlarging rate is not more than 5%,
C. the pilger mill operation adopts the hollow billet after pilger mill will be bored a hole to be rolled into hollow forging, and its lengthening coefficient scope is 3～9,
D. heating [4] again,
E. the hollow forging that will heat again becomes the steel pipe of required external diameter by sizing mill [5] sizing, and total reducing rate scope of sizing is 1.5%～5%,
F. finished product enters cold bed [6].
2. the rolling mill practice of a kind of hot rolled seamless steel tube according to claim 1, it is characterized in that: its roll piercing operation [2] is to use the Mannesmann piercing machine, and solid hot charge is pierced into hollow hollow billet.
3. the rolling mill practice of a kind of hot rolled seamless steel tube according to claim 1, it is characterized in that: it is heating process [4] again, is to use the stepping beam type reheating furnace, and hollow forging is heated to the required temperature of sizing equably.
4. the rolling mill practice of a kind of hot rolled seamless steel tube according to claim 1, it is characterized in that: its sizing operation [5] is to use two roller sizing mills or three roller sizing mills.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710027223 CN101020192A (en) | 2007-03-21 | 2007-03-21 | Hot rolling process of seamless steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710027223 CN101020192A (en) | 2007-03-21 | 2007-03-21 | Hot rolling process of seamless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101020192A true CN101020192A (en) | 2007-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710027223 Pending CN101020192A (en) | 2007-03-21 | 2007-03-21 | Hot rolling process of seamless steel pipe |
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|---|---|
| CN (1) | CN101020192A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| CN102015138B (en) * | 2008-03-25 | 2013-01-23 | 住友金属工业株式会社 | Method for manufacturing seamless pipe and method for determining the length of billet for manufacturing seamless pipe |
| CN103906584A (en) * | 2011-11-01 | 2014-07-02 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN103917307A (en) * | 2011-11-01 | 2014-07-09 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN104874606A (en) * | 2015-06-16 | 2015-09-02 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless steel seamless pipe |
| CN104907353A (en) * | 2015-06-16 | 2015-09-16 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless-steel seamless steel pipe blank |
| CN105127200A (en) * | 2015-09-29 | 2015-12-09 | 中国钢研科技集团有限公司 | Manufacturing method for pressurizer surge line of nuclear power plant |
-
2007
- 2007-03-21 CN CN 200710027223 patent/CN101020192A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102015138B (en) * | 2008-03-25 | 2013-01-23 | 住友金属工业株式会社 | Method for manufacturing seamless pipe and method for determining the length of billet for manufacturing seamless pipe |
| CN102069104A (en) * | 2010-11-30 | 2011-05-25 | 攀钢集团钢铁钒钛股份有限公司 | Method for producing seamless steel tube for big-caliber long tube air bottle in hot rolling mode |
| CN103906584A (en) * | 2011-11-01 | 2014-07-02 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN103917307A (en) * | 2011-11-01 | 2014-07-09 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN103906584B (en) * | 2011-11-01 | 2016-02-17 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN103917307B (en) * | 2011-11-01 | 2016-04-27 | 新日铁住金株式会社 | Manufacturing method of seamless metal pipe |
| CN104874606A (en) * | 2015-06-16 | 2015-09-02 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless steel seamless pipe |
| CN104907353A (en) * | 2015-06-16 | 2015-09-16 | 攀钢集团成都钢钒有限公司 | Production method of high-chromium ferrite stainless-steel seamless steel pipe blank |
| CN105127200A (en) * | 2015-09-29 | 2015-12-09 | 中国钢研科技集团有限公司 | Manufacturing method for pressurizer surge line of nuclear power plant |
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Open date: 20070822 |