CN101020191A - Hot rolling process of seamless steel pipe - Google Patents
Hot rolling process of seamless steel pipe Download PDFInfo
- Publication number
- CN101020191A CN101020191A CN 200710027222 CN200710027222A CN101020191A CN 101020191 A CN101020191 A CN 101020191A CN 200710027222 CN200710027222 CN 200710027222 CN 200710027222 A CN200710027222 A CN 200710027222A CN 101020191 A CN101020191 A CN 101020191A
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- Prior art keywords
- steel pipe
- sizing
- rolling
- expansion
- seamless steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 54
- 239000010959 steel Substances 0.000 title claims abstract description 54
- 238000005098 hot rolling Methods 0.000 title abstract description 3
- 238000004513 sizing Methods 0.000 claims abstract description 35
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 12
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 238000005242 forging Methods 0.000 claims description 14
- 238000009785 tube rolling Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 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 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
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- Metal Rolling (AREA)
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, rotary sizing or reeling, etc to realize perforating deformation, rolling deformation and sizing deformation. The present invention has raised rough pipe wall thickness, raised pipe outer diameter precision, 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 the two-roller skew-rolling elongator.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; And employing roll piercing, also exist pierced billet hollow billet quality not guarantee, the pierced billet process makes and with lubricator causes environmental pollution and use molybdenum base top to cause disadvantages such as cost increase,
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art and defective, provide a kind of technological process short, the rolling mill practice of small investment, energy-conservation hot rolled seamless steel tube.
For reaching above-mentioned purpose, the present invention proposes the Bar Rolling Process scheme of hot rolled seamless steel tube, comprises tube rolling and sizing or expansion two large deformation, specifically comprises following operation:
A. the hollow ingot raw material is heated to 1050～1200 ℃ of the required temperature of tube rolling equably,
B. pilger mill is rolled into hollow forging with the hollow ingot hollow billet that heats, and the lengthening coefficient scope is 3～9 during pilger mill,
C. adopt the insulation heat riser that hollow forging is incubated, is warmed up to 900～1050 ℃ of the required temperature of technology equably,
D. the reeler good hollow forging oblique milling that will be incubated or heat up becomes the expansion steel pipe,
E. heating again is heated to the required temperature of sizing equably with the expansion steel pipe,
F. adopt sizing mill, the expansion steel pipe sizing that heats is become the steel pipe of required external diameter, total reducing rate scope that this sizing mill uses is 1.5%～5%.
G. finished product enters cold bed, and steel pipe evenly is cooled to normal temperature.
It is that Φ 219～760mm, wall thickness range are the hot-rolled stainless seamless steel pipe of 10～50mm that this rolling mill practice is fit to produce outer diameter of steel pipes.
The rolling mill practice of above-mentioned described hot rolled seamless steel tube, its insulation heat riser can adopt through type heat tracing heating mode.
The rolling mill practice of above-mentioned described hot rolled seamless steel tube can adopt two roller sizing mills or three roller sizing mills, the expansion steel pipe sizing that heats is become the steel pipe of required external diameter.
The rolling mill practice of above-mentioned described hot rolled seamless steel tube can adopt the two-roller skew-rolling reeler, and the expansion process is used top and push rod, will be incubated with (or) the intensification hollow forging oblique milling of getting well becomes the expansion steel pipe.
The rolling mill practice of above-mentioned described hot rolled seamless steel tube can adopt walking beam heating furnace that the expansion steel pipe is heated to the required temperature of sizing equably.
The present invention compared with prior art has following beneficial effect:
Rolling mill practice of the present invention had both been avoided the deficiency of roll piercing, can bring into play the advantage that pilger mill uses large deformation again, was one of best rolling mill practice of producing stainless pipe.Compared with prior art, have that one-time investment is few, recovery rate of iron is high and a clear superiority such as production cost is low.
The present invention produces sizing behind the steel pipe elder generation expansion, and the thickness of steel pipe precision can be reached ± 6%～8%S, the outer diameter of steel pipes precision can ± below the 1.0%D.
Description of drawings
Figure is a process schematic representation of the present invention;
Symbol description among the figure
3 insulations of the 1 hollow ingot raw material that heats, 2 pilger mills, heat riser
4 reelers, 5 walking beam heating furnaces, 6 sizing mills
7 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 Bar Rolling Process scheme of this hot rolled seamless steel tube comprises following operation: 1 heating of hollow ingot raw material, pilger mill 2 tube rollings, through type insulation or heat riser 3 insulations or intensification, two-roller skew-rolling reeler 4 expansions, reheating furnace 5 heats again, sizing mill 6 sizings, cold bed 7 cool off etc.It is that Φ 219～760mm, wall thickness range are the hot-rolled stainless seamless steel pipe of 10～50mm that this rolling mill practice is fit to produce outer diameter of steel pipes.
Hot rolled seamless steel tube rolling mill practice of the present invention is heated to hollow ingot raw material 1 1050～1200 ℃ of beginnings that heat certainly equably, is rolled into behind the hot steel pipe till the cooling to sizing distortion operation.The present invention adopts hollow ingot to make raw material, can save perforation distortion operation; Tube rolling operation, its effect are hollow " hollow billet " wall thickness to be rolled thin length simultaneously extend, and are rolled into " hollow forging " that meet the requirement of fished pipe wall thickness, and the maximum lengthening coefficient of tube rolling is " greatly " distortion of 9.0; Sizing (containing expansion) is to guarantee that outer diameter of steel pipes and wall thickness accuracy meet the standard code requirement, and two-roller skew-rolling reeler and multimachine frame sizing mill, the maximum lengthening coefficient when expansion and sizing are " little " distortion of 1.4.
The raw material that the present invention adopts is a hollow ingot, and it has met the specification requirement that first road distortion operation pierced billet (or punching out) becomes hollow " hollow billet ", can directly enter subsequent processing.
The second road tube rolling distortion operation life cycle pipe mill, 2 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 the through type insulation with (or) heat riser 3, with hollow forging be incubated equably with (or) be warmed up to the required temperature of expansion.
The 3rd road sizing (containing expansion) distortion operation, the present invention uses two-roller skew-rolling reeler 4 expansions, it belongs to the oblique milling deformation method, the roll forming of the roll that adopts is barrel-shaped or taper, the maximum lengthening coefficient of expansion is 1.4, the hot tool that uses is roll, top and guide plate (or godet), uses guide plate when producing large-diameter steel pipe, uses godet when producing small-caliber steel pipe.Expansion steel pipe behind two-roller skew-rolling reeler 4 expansions uses stepping beam type reheating furnace 5 heating again, the expansion steel pipe is heated to 900～1050 ℃ equably after, use multimachine frame sizing mill 6 sizings, 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%, and the maximum lengthening coefficient of sizing is 1.2, and the steel pipe finishing temperature must not be lower than 900 ℃ behind the sizing.
Claims (5)
1. the rolling mill practice of hot rolled seamless steel tube comprises tube rolling and sizing or expansion two large deformation, specifically comprises following operation:
A. hollow ingot raw material [1] is heated to 1050～1200 ℃ of the required temperature of tube rolling equably,
B. pilger mill [2] is rolled into hollow forging with the hollow ingot hollow billet that heats, and the lengthening coefficient scope is 3～9 during pilger mill,
C. adopt insulation heat riser [3] that hollow forging is incubated, is warmed up to 900～1050 ℃ of the required temperature of technology equably,
D. reeler (4) the good hollow forging oblique milling that will be incubated or heat up becomes the expansion steel pipe,
E. heating again is heated to the required temperature of sizing equably with the expansion steel pipe,
F. adopt sizing mill (6), the expansion steel pipe sizing that heats is become the steel pipe of required external diameter, total reducing rate scope that this sizing mill uses is 1.5%～5%.
G. finished product enters cold bed (7), and steel pipe evenly is cooled to normal temperature.
2. the rolling mill practice of hot rolled seamless steel tube according to claim 1 is characterized in that: can adopt two-roller skew-rolling reeler (4), the expansion process is used top and push rod, will be incubated with (or) the intensification hollow forging oblique milling of getting well becomes the expansion steel pipe.
3. the rolling mill practice of hot rolled seamless steel tube according to claim 1 is characterized in that: " operation c " heating and heat-insulating device (4), can adopt the through type heat tracing to heat up.
4. the rolling mill practice of hot rolled seamless steel tube according to claim 1 is characterized in that: can adopt two roller sizing mills or three roller sizing mills (6), the expansion steel pipe sizing that heats be become the steel pipe of required external diameter.
5. the rolling mill practice of hot rolled seamless steel tube according to claim 4 is characterized in that: can adopt walking beam heating furnace (5) that the expansion steel pipe is heated to the required temperature of sizing equably.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710027222 CN101020191A (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 200710027222 CN101020191A (en) | 2007-03-21 | 2007-03-21 | Hot rolling process of seamless steel pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101020191A true CN101020191A (en) | 2007-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200710027222 Pending CN101020191A (en) | 2007-03-21 | 2007-03-21 | Hot rolling process of seamless steel pipe |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101797586A (en) * | 2010-03-30 | 2010-08-11 | 天津钢管集团股份有限公司 | Hot sizing device with four-roll five-machine frame rolling mill and production method thereof |
| CN101532113B (en) * | 2008-03-11 | 2011-08-24 | 宝山钢铁股份有限公司 | Anti-collapse oil casing and manufacturing method thereof |
| CN101687232B (en) * | 2007-12-05 | 2013-01-23 | 住友金属工业株式会社 | Manufacturing method of ultra-thin metal pipe by cold rolling method |
| CN101745537B (en) * | 2010-01-11 | 2013-05-29 | 中冶东方工程技术有限公司 | Method for producing seamless steel tube with heat preservation cover of pilger mill |
| CN103252348A (en) * | 2013-05-09 | 2013-08-21 | 新兴铸管股份有限公司 | Hot rolling forming method of stainless steel seamless steel tube |
| 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 |
| CN105921524A (en) * | 2016-05-11 | 2016-09-07 | 天津钢管集团股份有限公司 | Controlled rolling method in seamless pipe hot rolling process |
| CN110404973A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm |
-
2007
- 2007-03-21 CN CN 200710027222 patent/CN101020191A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101687232B (en) * | 2007-12-05 | 2013-01-23 | 住友金属工业株式会社 | Manufacturing method of ultra-thin metal pipe by cold rolling method |
| CN101532113B (en) * | 2008-03-11 | 2011-08-24 | 宝山钢铁股份有限公司 | Anti-collapse oil casing and manufacturing method thereof |
| CN101745537B (en) * | 2010-01-11 | 2013-05-29 | 中冶东方工程技术有限公司 | Method for producing seamless steel tube with heat preservation cover of pilger mill |
| CN101797586A (en) * | 2010-03-30 | 2010-08-11 | 天津钢管集团股份有限公司 | Hot sizing device with four-roll five-machine frame rolling mill and production method thereof |
| CN103252348A (en) * | 2013-05-09 | 2013-08-21 | 新兴铸管股份有限公司 | Hot rolling forming method of stainless steel seamless steel tube |
| 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 |
| CN105921524A (en) * | 2016-05-11 | 2016-09-07 | 天津钢管集团股份有限公司 | Controlled rolling method in seamless pipe hot rolling process |
| CN110404973A (en) * | 2019-07-15 | 2019-11-05 | 扬州诚德钢管有限公司 | A kind of manufacturing method for the seamless steel pipe that diameter is 760mm~914mm |
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Open date: 20070822 |