CN102039311A - Short-flow longitudinal rolling production method for small-bore high-alloy seamless steel pipe - Google Patents
Short-flow longitudinal rolling production method for small-bore high-alloy seamless steel pipe Download PDFInfo
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- CN102039311A CN102039311A CN2010105051162A CN201010505116A CN102039311A CN 102039311 A CN102039311 A CN 102039311A CN 2010105051162 A CN2010105051162 A CN 2010105051162A CN 201010505116 A CN201010505116 A CN 201010505116A CN 102039311 A CN102039311 A CN 102039311A
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Abstract
The invention relates to a short-flow longitudinal rolling production method for a small-bore high-alloy seamless steel pipe. The short-flow longitudinal rolling production method for the small-bore high-alloy seamless steel pipe is implemented by five process steps of preparing billets, heating pipe billets, rolling tubular billets, rolling pierced billets and sizing the finished pipes. During sizing, a sizing mill is used for replacing a rod-removing machine to realize on-line rod-removing function; the process is suitable for the characteristics of various specifications, various types and small batched order quantity during the production of boiler pipes. Due to the adoption of the short-flow production, the investment is relatively small and is about 1/3 of PQF or FQM investment of the traditional continuous rolling line; and the finished product ratio is increased. The production process is flexible; and multi-specification multi-variety pipe billets are shaped by a net-shape forming technique and are produced economically. The total investment is small; the compression rolling ratio of the small-bore steel pipe is economic; and energy consumption and pollution are low. The investment is small; the consumed cost of tools and dies is low; and the product quality is guaranteed.
Description
Technical field
The present invention relates to the short flow process axial rolling of a kind of small-bore high-alloy seamless steel pipe production technology.
Background technology
Small-bore high-alloy seamless steel pipe is meant external diameter below 114mm, adopts alloy pipe stock to make.Steel pipe is widely used in fields such as large-sized boiler, power station, PETROLEUM PROCESSING.But, be difficult to arrange production because the small-caliber steel pipe specification that the boiler power station is used is many, wide in variety, length specification is many, the single order quantity is few.So present domestic two kinds of production methods that mainly contain.The one, long flow process continuous rolling production line, mostly be 5～6 three groups of open type roller mills greatly, continuous rolling production line output is big, and is complete in specifications, can realize the production of boiler tube, but the production line investment is very big, the cost that tool and mould consumes is also very high, and operative skill requires very high, adopts single big pipe to produce the compression ratio surplus that small-caliber steel pipe is produced, produce uneconomically, belong to highly energy-consuming production.The 2nd, adopt cold-drawn production, at present domestic still in this way is main, cold-drawn is produced small-bore pipe and is also had its advantage, production technology is flexible, adaptability is strong, is the pickling of not breaking away from steel pipe but the puzzlement cold-drawn produces, pollutes heavy, labour intensity is big, and cold-drawn is produced the cost of steel pipe than the hot rolling height.For the steel pipe of some special steel grades, as T11, T12, T91, above-mentioned two kinds of methods such as T92 all can not be produced, and can only lean on cold rolling process production at present, and face the production cost height equally, the production bottleneck that lumber recovery is low.
Along with country to high energy consumption, the management that high pollution enterprise produces is more and more stronger, middle and small scale cold-drawn manufacturer of the thousands of family of China, it is aging to be faced with equipment, technology falls behind, the present situation that production cost is high is also sought the outlet of novel seamless steel pipe's production in a hurry.
Summary of the invention
The object of the invention is to provide the short flow process axial rolling of a kind of small-bore high-alloy seamless steel pipe production technology, and it not only can adapt to many kinds that boiler tube is produced, many steel grades, characteristics such as batch output is few.
The present invention includes following steps:
1) blank is prepared: continuous solid tubes is cut off, formed solid pipe;
2) heating of pipe blank: place the stove that goes in ring to heat solid pipe;
3) hollow billet is rolling: the solid pipe that will heat is delivered to the perforation unit and is prolonged and axially pierce a through hole, forms hollow hollow billet;
4) hollow forging is rolling: place a short plug in the through hole of hollow hollow billet, hollow hollow billet is placed prolong vertically rollingly on three groups of open type roller mills that prolong vertical arrangement, form hollow forging;
5) production tube sizing: in the through hole of hollow forging, place a short plug, hollow forging is placed sizing on the sizing mill, on cold bed, cool off then.
When hollow billet was rolling, the total length difference of hollow hollow billet and solid pipe was 2～3mm.
When hollow forging is rolling, be set in the interior short plug transfixion of through hole of hollow hollow billet.
When hollow forging was rolling, the axial rolling lengthening coefficient was 1.2～2.Adopting little extensional is that the hollow billet surface quality that guarantees to have worn behind the hole improves, and finishes and decide the wall process.
When the production tube sizing, be set in the interior short plug transfixion of through hole of hollow forging.
The present invention has adopted above technical scheme, produces small-bore high-alloy seamless steel pipe by the short flow process of five big processing steps realizations.Adopt sizing mill to replace taking off excellent machine during sizing of the present invention and realize the online excellent function of taking off.Adopt this technology can adapt to the many specifications of boiler tube in producing, many kinds, the characteristics that the batch ordering amount is few.Especially diameter is less than 114mm, and wall thickness is that 14mm is following, material is some high alloy steel pipes that are difficult to produce of T11, T12, T91 or T92.Adopt this short flow process production investment less relatively, be about 1/3 of traditional tandem rolling line PQF or FQM investment, adopt oblique milling, vertical rolling mode product quality height, and lumber recovery is improved also.Compare with the cold-drawn production technology with long flow process tandem rolling, it is flexible to have production technology, many descriptions pipe, near-net forming, economical production.And overall investment is few, and the small-caliber steel pipe compression is rolling than economical, low energy consumption, the low pollution.And invest for a short time, the tool and mould consuming cost is very low, and product quality is secure.
The specific embodiment:
Production stage:
1, material is prepared: select pipe from the pipe warehouse, pipe is carried out dimension control, and flaw detection, qualified pipe is selected in chemical analysis and metallographic microanalysis.Qualified pipe is cut into Len req according to technological requirement, form solid pipe, stand-by.
2, heating of pipe blank: with belt stove solid pipe is heated, be heated to the temperature of technological requirement.
3, hollow billet is rolling: the solid pipe that will heat is transferred to the perforation unit and bores a hole, and forms hollow hollow billet.The present invention adopts vertical cone mill to prolong and axially pierces a through hole, and overall elongation is controlled in 2～3mm, and the total length difference of promptly hollow hollow billet and solid pipe is 2～3mm.Will be before perforation according to the material and the specification of the pipe of the hollow billet specification that will produce and use, the roll spacing, guide plate of adjusting the perforation unit apart from and come directly towards position etc.The hollow billet wall thickness is by roll and top distance decision before.This distance can be adjusted by adjusting roller spacing, top diameter and position, top.The external diameter of hollow billet is decided by guide plate distance, roll shop building distance and position, top.
4, hollow forging is rolling: hollow hollow billet places and prolongs vertically rollingly on three groups of open type roller mills of vertical arrangement, forms hollow forging.Wherein, the open type roller mill can adopt three roller adjustable roller frames, places an actionless short plug when rolling in the through hole of hollow hollow billet, and the axial rolling lengthening coefficient is 1.2～2.
5, production tube sizing: place an actionless short plug in the steel pipe after axial rolling, directly carry out the finish rolling sizing then on sizing mill, total sizing reduction can guarantee the appearance and size of the steel pipe in intact footpath surely in 30%, can guarantee that again wall thickness remains unchanged.On cold bed, cool off behind the sizing.
Claims (5)
1. the short flow process axial rolling of small-bore high-alloy seamless steel pipe production method is characterized in that may further comprise the steps:
1) blank is prepared: continuous solid tubes is cut off, formed solid pipe;
2) heating of pipe blank: place the stove that goes in ring to heat solid pipe;
3) hollow billet is rolling: the solid pipe that will heat is delivered to the perforation unit and is prolonged and axially pierce a through hole, forms hollow hollow billet;
4) hollow forging is rolling: place a short plug in the through hole of hollow hollow billet, hollow hollow billet is placed prolong vertically rollingly on three groups of open type roller mills that prolong vertical arrangement, form hollow forging;
5) production tube sizing: in the through hole of hollow forging, place a short plug, hollow forging is placed sizing on the sizing mill, on cold bed, cool off then.
2. according to the short flow process axial rolling of the described small-bore high-alloy seamless steel pipe of claim 1 production method, it is characterized in that when hollow billet is rolling the total length difference of hollow hollow billet and solid pipe is 2～3mm.
3. according to the short flow process axial rolling of the described small-bore high-alloy seamless steel pipe of claim 1 production method, it is characterized in that when hollow forging is rolling short plug transfixion.
4. according to the short flow process axial rolling of the described small-bore high-alloy seamless steel pipe of claim 1 production method, it is characterized in that when hollow forging is rolling the axial rolling lengthening coefficient is 1.2～2.
5. according to the short flow process axial rolling of the described small-bore high-alloy seamless steel pipe of claim 1 production method, it is characterized in that when the production tube sizing short plug transfixion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105051162A CN102039311A (en) | 2010-09-29 | 2010-09-29 | Short-flow longitudinal rolling production method for small-bore high-alloy seamless steel pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105051162A CN102039311A (en) | 2010-09-29 | 2010-09-29 | Short-flow longitudinal rolling production method for small-bore high-alloy seamless steel pipe |
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| CN102039311A true CN102039311A (en) | 2011-05-04 |
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| CN2010105051162A Pending CN102039311A (en) | 2010-09-29 | 2010-09-29 | Short-flow longitudinal rolling production method for small-bore high-alloy seamless steel pipe |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN105478478A (en) * | 2015-11-19 | 2016-04-13 | 扬州诚德钢管有限公司 | Process for forming large-diameter seamless thick-wall and extra-strong steel pipes |
| CN114289512A (en) * | 2021-12-31 | 2022-04-08 | 江苏银环精密钢管有限公司 | Accurate feeding method for U-shaped seamless tube for high-pressure heater |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189111A (en) * | 1996-04-19 | 1998-07-29 | 住友金属工业株式会社 | Seamless steel pipe manufacturing method and equipment |
| CN1544168A (en) * | 2003-11-24 | 2004-11-10 | 中国地质大学（武汉） | Hollow drill steel rolling process |
| CN101020190A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN101428298A (en) * | 2008-12-03 | 2009-05-13 | 无锡西姆莱斯石油专用管制造有限公司 | Process for manufacturing pipeline tube |
-
2010
- 2010-09-29 CN CN2010105051162A patent/CN102039311A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1189111A (en) * | 1996-04-19 | 1998-07-29 | 住友金属工业株式会社 | Seamless steel pipe manufacturing method and equipment |
| CN1544168A (en) * | 2003-11-24 | 2004-11-10 | 中国地质大学（武汉） | Hollow drill steel rolling process |
| CN101020190A (en) * | 2007-03-21 | 2007-08-22 | 中冶东方工程技术有限公司 | Hot rolling process of seamless steel pipe |
| CN101428298A (en) * | 2008-12-03 | 2009-05-13 | 无锡西姆莱斯石油专用管制造有限公司 | Process for manufacturing pipeline tube |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105234200A (en) * | 2015-11-19 | 2016-01-13 | 扬州诚德钢管有限公司 | On-line tube-expanding production process of large-diameter seamless steel tubes |
| CN105478478A (en) * | 2015-11-19 | 2016-04-13 | 扬州诚德钢管有限公司 | Process for forming large-diameter seamless thick-wall and extra-strong steel pipes |
| CN114289512A (en) * | 2021-12-31 | 2022-04-08 | 江苏银环精密钢管有限公司 | Accurate feeding method for U-shaped seamless tube for high-pressure heater |
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Application publication date: 20110504 |