CN100570195C - The manufacture method of large-diameter seamless steel tube - Google Patents
The manufacture method of large-diameter seamless steel tube Download PDFInfo
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- CN100570195C CN100570195C CNB2008101239048A CN200810123904A CN100570195C CN 100570195 C CN100570195 C CN 100570195C CN B2008101239048 A CNB2008101239048 A CN B2008101239048A CN 200810123904 A CN200810123904 A CN 200810123904A CN 100570195 C CN100570195 C CN 100570195C
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Abstract
The present invention relates to a kind of manufacture method of large-diameter seamless steel tube, this method selects for use the straight seam welded steel pipe of external diameter Φ 508mm～Φ 610mm to manage as mother, be processed into flawless female pipe, become the hollow forging of external diameter Φ 620mm～Φ 1400mm through the thermal expansion of at least one passage, carry out cold hole enlargement aligning and become the crude product steel pipe of external diameter Φ 630mm～Φ 1422mm, at last to the crude product steel pipe carry out pipe end processing, the hydrostatic test, pipe end flaw detection and body flaw detection, survey longly weigh, spray printing obtains the finished product large-diameter seamless steel tube after being coated with the wet goods finishing.This method not only can be produced the large-diameter seamless steel tube that no weld seam exists, and replace straight-line joint submerged arc welding tube (UOE and JCOE), and cost is lower, and manufacturing efficiency height, product can be directly used in petroleum gas and carry.
Description
Technical field
The present invention relates to a kind of manufacture method of steel pipe, specifically, relate to a kind of manufacture method of large-diameter seamless steel tube, belong to the Ferrous Metallurgy field.
Background technique
It is Φ 630mm～Φ 1422mm that heavy caliber seamless steel pipe refers to external diameter, and wall thickness is 6mm～25.4mm, and length is the steel pipe of 6000mm～12000mm, mainly is to comprise spiral submerged welded pipe, straight-line joint submerged arc welding tube, plate bending rolls butt welded tube.Poor, the outer diameter of steel pipes low precision of the Forming Quality of plate bending rolls butt welded tube wherein, weld seam is many and efficient is low, is not suitable for producing in enormous quantities.The manufacturing efficiency of spiral submerged welded pipe is 1.0～2.0 meters/minute, but because the length of weld seam is 1.5～2.5 times of straight-line joint submerged arc welding tube, the easy misalignment of weld bond, the residual stress of pipe is big, and can't eliminate with the mode of cold hole enlargement, therefore, the spiral submerged welded pipe oil gas that only is used for the lower or inessential area of pressure is carried.What the transfering natural gas from the west to the east the second stage of the project of China was used in a large number at present is straight-line joint submerged arc welding tube.Straight-line joint submerged arc welding tube mainly comprises UOE steel pipe and JCOE steel pipe, no matter is UOE steel pipe or JCOE steel pipe, and the raw material that its straight-line joint submerged arc welding tube production line uses all are Wide and Thick Slab, and its price is very high, is generally 9000～9500 yuan/ton.
At present, advantages such as ERW (straight seam welded steel pipe) is simple because of processing technology, productivity is high, processing cost is low, constant product quality have obtained application more and more widely.The ERW straight seam welded steel pipe be with coil of strip as raw material, become welded tube through overmolding, high frequency welding.Raw material are abundant especially and price is low, and the hot-rolled coil price of same material is about 5900～6200 yuan/ton, than low 2500～3000 yuan/ton of Wide and Thick Slab.If as raw material, produce bigbore steel pipe with hot-rolled coil, on raw-material price, have clear superiority.The thermal expansion method generally is the production that is used for the pipe elbow of production medium-small diameter, also have indivedual enterprises use in small-bore weldless tube carry out thermal expansion, produce large diameter slightly weldless tube, present domestic fertile maximum outside diameter Φ 460mm, maximum specification through thermal expansion is external diameter Φ 810mm, wall thickness 10～40mm.Also do not produce the large-diameter seamless steel tube of diameter at present greater than Φ 1016mm through thermal expansion.
Summary of the invention
The manufacture method that the purpose of this invention is to provide a kind of large-diameter seamless steel tube (external diameter Φ 630mm～Φ 1422mm), this method not only can be produced the large-diameter seamless steel tube that no weld seam exists, replace straight-line joint submerged arc welding tube, and cost is lower, manufacturing efficiency height, product can be directly used in petroleum gas and carry.
The object of the present invention is achieved like this, and the manufacture method of large-diameter seamless steel tube may further comprise the steps:
(1) selection of female pipe and processing: selecting external diameter for use is that the medium caliber straight seam welded steel pipe of Φ 508mm～Φ 610mm is managed as mother, and the inside and outside burr of removing, the annealing of intermediate frequency weld seam, body and seam inspection, do the quality that has guaranteed the ERW welded tube like this, thereby make raw-material source to guarantee, in addition, in order to guarantee the length of production tube, generally all use long ERW welded tube to manage as mother;
(2) thermal expansion: with more than the effective Frequency Induction Heating to 930 of mother ℃, by the thermal expansion of at least one passage, become the hollow forging of external diameter Φ 620mm～Φ 1400mm, each passage enlarging rate is 120%～180%; The wall thickness change of pipe is little in the production process of hole enlargement, mainly is the shorten length of pipe, and external diameter enlarges.
(3) cold hole enlargement: with the cold hole enlargement becoming of the hollow forging in previous step external diameter Φ 630mm～Φ 1422mm crude product large-diameter seamless steel tube, enlarging rate is 101%～102%; The purpose in this step is, because uneven steel pipe cooling and nonuniform plastic deformation, very big, external diameter of the tortuosity of pipe and circularity change greatly behind the thermal expansion, can not directly use, and be the steel pipe of Φ 630mm～Φ 1422mm for external diameter, because external diameter and wall ratio are big, can not adopt conventional cross roll aligning or gag press straightening mode to align, adopt cold hole enlargement mode, steel pipe behind the thermal expansion is carried out full circle and aligning, and eliminate uneven residual stress, thereby guaranteed the follow-up use of steel pipe.
(4) finishing: earlier the crude product large-diameter seamless steel tube that obtains in the previous step is carried out pipe end processing, the head and the tail two ends cut into concordant state, mainly are the inhomogeneous deformation parts of excision pipe head, guarantee the circularity and the wall thickness of pipe; Then to the finished product large-diameter seamless steel tube carry out the hydrostatic test, pipe end and body flaw detection, survey longly weigh, the spray printing oiling, obtain the finished product large-diameter seamless steel tube.In this process, each root steel pipe all being carried out the circumferential stress that the pressure of the hydrostatic test, test bears by pipe is 60% of nominal yield strength, and 10 seconds of pressurize, to guarantee the high-voltage resistance capability of pipe.Pipe end and body to pipe carries out ultrasonic flaw detection again, prevents that from there are little defectives such as crackle in tube interior.At last pipe is surveyed the long spray printing of weighing and be coated with the wet goods operation, so that finished product dispatches from the factory;
Preferably, said thermal expansion comprise two passages, the enlarging rate of each passage is 130%～145%, the enlarging rate of said cold hole enlargement is 101.5%～101.6%;
Preferably, the external diameter of the straight seam welded steel pipe of said medium caliber is Φ 610mm, and wall thickness is 17.5mm, and length is 22000mm; The external diameter of hollow forging is 1200mm, and wall thickness is 16.2mm, and length is 12500mm; The external diameter of crude product large-diameter seamless steel tube is Φ 1219mm, and wall thickness is 16.0mm, and length is 12400mm, and said thermal expansion mode is a push mode;
More preferably, said thermal expansion mode is the drawing formula.
The large-diameter seamless steel tube that adopts manufacture method of the present invention to produce is compared with UOE, JCOE heavy caliber straight-line joint submerged arc welding tube, has following advantage:
(1) boundary dimension of steel pipe is all very even at length direction or the wall thickness of circumferencial direction and external diameter, and dimensional accuracy is better than seamless steel tube.
(2) weld seam of steel pipe has passed through heating for multiple times and deformation process, no matter be at length direction or even in the tissue and the performance of circumferencial direction, identical with seamless steel tube, no matter be that antiseptic property or withstand voltage properties obviously are better than UOE and JCOE heavy caliber straight-line joint submerged arc welding tube.
Embodiment
Below by embodiment the present invention is described further.
It is Φ 1219mm that embodiment 1 makes external diameter, and wall thickness is 16mm, and length is the seamless steel tube of 12000mm
(1) selection of female pipe and processing: selecting external diameter for use is Φ 610mm, and wall thickness is 17.5mm, and length is that the medium caliber straight seam welded steel pipe of 22000mm is managed as mother, and removes inside and outside burr, the annealing of intermediate frequency weld seam, body and seam inspection;
(2) thermal expansion: adopt push mode hole enlargement mode, with the effective Frequency Induction Heating to 940 of mother ℃, hole enlargement plug of inner placement, heating in medium frequency induction coil and hole enlargement plug maintain static, promote steel pipe by the hole enlargement plug by the pushing main frame, realize hole enlargement, become external diameter Φ 900mm through the first passage Frequency Induction Heating pushing thermal expansion to steel pipe, wall thickness 16.8mm, length is the intervalve of 16040mm; Through the second passage thermal expansion is external diameter Φ 1200mm, wall thickness 16.2mm, and length is the hollow forging of 12500mm;
(3) cold hole enlargement: with the cold hole enlargement becoming of the hollow forging in previous step external diameter Φ 1219mm, wall thickness is 16.0mm, and length is the crude product large-diameter seamless steel tube of 12400mm;
(4) finishing: earlier the crude product large-diameter seamless steel tube that obtains in the previous step is carried out pipe end processing, the head and the tail two ends cut into concordant state; Then to the finished product large-diameter seamless steel tube carry out the hydrostatic test, pipe end and body flaw detection, survey longly weigh, the spray printing oiling, obtain external diameter Φ 1219mm, wall thickness is 16.0mm, length is the finished product large-diameter seamless steel tube of 12000mm, meets state quality standard.
It is Φ 1240mm that embodiment 2 makes external diameter, and wall thickness is 20mm, and length is the seamless steel tube of 12000mm
(1) selection of female pipe and processing: selecting external diameter for use is Φ 610mm, and wall thickness is 17.5mm, and length is that the medium caliber straight seam welded steel pipe of 22000mm is managed as mother, and removes inside and outside burr, the annealing of intermediate frequency weld seam, body and seam inspection;
(2) thermal expansion: adopt drawing formula hole enlargement mode, with more than the effective Frequency Induction Heating to 945 of mother ℃, hole enlargement plug of inner placement, steel pipe maintains static, the heating in medium frequency induction coil moves with the hole enlargement plug and moves simultaneously, and the hole enlargement plug is realized the hole enlargement to the steel pipe body under the pulling of drawing main frame, become external diameter Φ 1000mm through the first passage Frequency Induction Heating pushing thermal expansion, wall thickness 20.8mm, length is the intervalve of 16500mm; Through the second passage thermal expansion is external diameter Φ 1215mm, wall thickness 20.2mm, and length is the hollow forging of 12500mm;
(3) cold hole enlargement: with the cold hole enlargement becoming of the hollow forging in previous step external diameter Φ 1240mm, wall thickness is 20mm, and length is the crude product large-diameter seamless steel tube of 12400mm;
(4) finishing: earlier the crude product large-diameter seamless steel tube that obtains in the previous step is carried out pipe end processing, the head and the tail two ends cut into concordant state; Then to the finished product large-diameter seamless steel tube carry out the hydrostatic test, pipe end and body flaw detection, survey longly weigh, the spray printing oiling, obtain external diameter Φ 1240mm, wall thickness is 20mm, length is that the finished product large-diameter seamless steel tube of 12000mm meets state quality standard.
Claims (5)
1, the manufacture method of large-diameter seamless steel tube is characterized in that, may further comprise the steps:
(1) selection of female pipe and processing: selecting external diameter for use is that the medium caliber straight seam welded steel pipe of Φ 508mm～Φ 610mm is managed as mother, and removes inside and outside burr, the annealing of intermediate frequency weld seam, body and seam inspection;
(2) thermal expansion: with more than the effective Frequency Induction Heating to 930 of mother ℃, by the thermal expansion of at least one passage, become the hollow forging of external diameter Φ 620mm～Φ 1400mm, each passage enlarging rate is 120%～180%;
(3) cold hole enlargement: with the cold hole enlargement becoming of the hollow forging in previous step external diameter Φ 630mm～Φ 1422mm crude product large-diameter seamless steel tube, enlarging rate is 101%～102%;
(4) finishing: earlier the crude product large-diameter seamless steel tube that obtains in the previous step is carried out pipe end processing, the head and the tail two ends cut into concordant state; Then to the finished product large-diameter seamless steel tube carry out the hydrostatic test, pipe end and body flaw detection, survey longly weigh, the spray printing oiling, obtain the finished product large-diameter seamless steel tube.
2, the manufacture method of large-diameter seamless steel tube according to claim 1 is characterized in that, said thermal expansion comprises two passages, and the enlarging rate of each passage is 130%～145%, and the enlarging rate of said cold hole enlargement is 101.5%～101.6%.
3, the manufacture method of large-diameter seamless steel tube according to claim 2 is characterized in that, the external diameter of the straight seam welded steel pipe of said medium caliber is Φ 610mm, and wall thickness is 17.5mm, and length is 22000mm; The external diameter of hollow forging is 1200mm, and wall thickness is 16.2mm, and length is 12500mm; The external diameter of crude product large-diameter seamless steel tube is Φ 1219mm, and wall thickness is 16.0mm, and length is 124000mm.
According to the manufacture method of the described large-diameter seamless steel tube of arbitrary claim among the claim 1-3, it is characterized in that 4, said thermal expansion mode is a push mode.
According to the manufacture method of the described large-diameter seamless steel tube of arbitrary claim among the claim 1-3, it is characterized in that 5, said thermal expansion mode is the drawing formula.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2008101239048A CN100570195C (en) | 2008-06-12 | 2008-06-12 | The manufacture method of large-diameter seamless steel tube |
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| CNB2008101239048A CN100570195C (en) | 2008-06-12 | 2008-06-12 | The manufacture method of large-diameter seamless steel tube |
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| CN100570195C true CN100570195C (en) | 2009-12-16 |
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| CN101825883A (en) * | 2010-04-12 | 2010-09-08 | 中国石油集团渤海石油装备制造有限公司 | Tubing intelligent forming detection and correction method and tubing forming system |
| CN102233510B (en) * | 2011-05-23 | 2016-06-08 | 天津市裕兴钢管有限公司 | Heavy caliber longitudinal submerged arc welded pipe production technique |
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