CN104388663A - Thermomechanical treatment method of tube longitudinal welding seam - Google Patents
Thermomechanical treatment method of tube longitudinal welding seam Download PDFInfo
- Publication number
- CN104388663A CN104388663A CN201410674179.9A CN201410674179A CN104388663A CN 104388663 A CN104388663 A CN 104388663A CN 201410674179 A CN201410674179 A CN 201410674179A CN 104388663 A CN104388663 A CN 104388663A
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- Prior art keywords
- tubing
- welding seam
- deformation
- weld
- seam
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Abstract
The invention discloses a thermomechanical treatment method of a tube longitudinal welding seam, which comprises the following steps: carrying out local heating on the welding seam by medium-frequency induction to complete austenitizing temperature above, extruding until the tube welding seam structure has certain deformation, and carrying out quenching+sub-temperature normalizing heat treatment so that the tube longitudinal welding seam has the same properties as the tube body structure. The method obviously optimizes the structure and performance of the welding seam; the longitudinal continuous welding seam of the welded steel tube has similar structure and performance to the base material; the deformation strengthening and heat treatment are organically combined to implement integration and continuity of the continuous rheological extrusion forming and achieve the goal that the tube body has basically the same structure and performance as the welding seam; and the method has the characteristics of high production efficiency and good product performance. The method has the advantages of simple technique, low cost and the like, and can easily implement industrialization.
Description
Technical field:
The invention belongs to field of metallurgy, relate to a kind of deformation heat treatment method of tubing, especially a kind of deformation heat treatment method of tubing lengthwise weld seam.
Background technology:
Straight seam welded steel pipe application is in the industry increasingly extensive, particularly in oil and gas field, the large heavy caliber pipe to oil-gas transportation, little under enter oil well pipe in thousands of rice bran oil well, have the trend of replacement conventional helical welded tube and weldless steel tube.But along with deepening continuously of straight seam welded steel pipe application, the requirement of harsh work condition environment properties of weld is more and more higher.
The longitudinal weld tissue of straight seam welded steel pipe, the method for performance optimization adopt the method for weld seam partial heat treatment usually, as normalizing, annealing etc.Adopt this type of heat treating method that the structure property of weld seam can be made to be optimized, but the limited efficiency optimized.Reason is that Heating temperature needs usually higher than AC3 when thermal treatment butt welded seam organization optimization is better, when welded seam area is locally heated to more than AC3, can form new heat affected zone again at heating region edge, become the performance weak area that another is potential.
When eliminating seam organization defect by homogeneous tube thermal treatment, the Heating temperature higher than AC3 makes tubing easily be out of shape under external force; And Heating temperature lower than AC3 time, the limited efficiency of the optimization of seam organization.
Summary of the invention:
The object of the invention is to the shortcoming overcoming above-mentioned prior art, a kind of deformation heat treatment method of tubing lengthwise weld seam is provided, adopt Medium frequency induction mode that weld seam is locally heated to more than complete austenitizing temperature, the mode of extruding is adopted to make tubing seam organization that a certain amount of deformation occur, then the heat treating method of quenching+sub-temperature normalizing is adopted to make the microstructure and property of tubing longitudinal weld and body basically identical, to improve the structure property of tubing lengthwise weld seam, thus improve tubing overall performance and service safety.
The object of the invention is to solve by the following technical programs:
(1) before tube forming, according to the size of tubing specification, deformation quantity, the sheet material of slitting respective width or band, the wide and bevel shape of accurate switchboard.
(2) sheet material or band are adopted UOE method precise forming, accurately control angular aperture, amount of compression, the tubing after shaping adopts the welding processs such as ratio-frequency welding, plasma weldering, argon arc welding to weld, and postwelding removes outer wall weld reinforcement.
(3) intermediate frequency or other rapid heating modes is adopted by welded seam area to be heated to more than AC3, employing accurately the mould of sizing or pair of rollers tubing heating region can apply certain deformation along tubing circumference, thus the tissue of welded seam area is control effectively.
(4), after thermomechanical treatment, cooling is fast implemented in butt welded seam region, to guarantee to cool the tiny tissue of rear acquisition crystal grain.After deformation completes, the weld reinforcement after extruding is cleared up.
(5) full body is heated to two-phase region, as required, controlled cooling model is carried out to it.The type of cooling is water-cooled after air cooling to certain temperature, or is as cold as air cooling or sub-sectional cooling after certain temperature soon, comprises after being cooled to specified temp and being incubated, make tubing and welded seam area have close structure and properties.
Beneficial effect of the present invention is:
(1) for the tubing of continuous welding, devise a kind of method improving tubing lengthwise seam organization, performance, make seam organization, performance obviously optimizes.
(2) the present invention adopts thermomechanical treatment to improve the structure and properties of the longitudinal continuous weld of Welded Steel Pipe, makes it close with mother metal.
(3) working hardening and thermal treatment organically combine by the present invention, achieve Continuous Flow and become extrusion molding integration and serialization, achieve the object that body and seam organization, performance are basically identical.
(4) have that production efficiency is high, the feature of good product performance.There is the advantages such as simple process, cost are low, easy industrialization.
Embodiment:
Below the present invention is described in further detail:
| Element | C | Si | Mn | P | S | Cr+Mo+Ni+Nb+Ti+Cu |
| Design requirements | 0.100 | 0.381 | 0.80 | 0.006 | 0.004 | 0.92 |
Intend adopting Φ 38.1 × 3.18mm low-carbon microalloy tubing that high frequency welding method manufacture reaches 3500 meters.
(1) according to the demand manufacturing Φ 38.1 × 3.18mm specification, the steel band that employing has following composition, thickness is 3.18mm welds.
(2) according to factors such as the thermomechanical treatments of viscous deformation and weld seam in the specification of the finished product, moulding process, be width be 120.2mm by sheet material slitting, edge is the steel band of I type groove.
(3) adopt UOE method shaping, accurately control angular aperture, amount of compression, adopt high frequency welding method to complete tubing welding.Weld rear employing dedicated tool and removed outer wall weld reinforcement, and made outer pipe wall keep cambered surface.
(4) adopt frequency induction heating by welded seam area laser heating to 925 DEG C, effective width of heating is 15cm.Tubing after heating is continued through three frame extrusion rolls, and water-cooled is carried out to it.
(5) adopt intermediate frequency heating method that body is heated to two-phase region, make its air cooling to 400 ~ 500 DEG C, be incubated water-cooled after three minutes.
(6) homogeneous tube is heated to 500 DEG C of annealing.
(7) adopt the inventive method to prepare the low-carbon microalloy tubing of excellent performance, its seam organization is obviously optimized, basic consistent with body tissue.This tubing does hydrostatic test under the internal pressure conditions of 68.8MPa, and pressurize 15 minutes, does not reveal.Show that weld properties is excellent.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, when the method and technology contents that can utilize above-mentioned announcement are made a little change or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, still belong in the scope of technical solution of the present invention.
Claims (3)
1. the deformation heat treatment method of a tubing lengthwise weld seam, it is characterized in that: adopt Medium frequency induction that weld seam is locally heated to more than complete austenitizing temperature, make tubing seam organization that a certain amount of deformation occur by extruding, then adopt the thermal treatment of quenching+sub-temperature normalizing to make the performance of tubing longitudinal weld consistent with the performance of body tissue.
2. the deformation heat treatment method of tubing lengthwise weld seam as claimed in claim 1, is characterized in that, comprise the steps:
(1) before tube forming, according to the size of tubing specification and deformation quantity, the sheet material of slitting respective width or band, the wide and bevel shape of accurate switchboard;
(2) sheet material or band are adopted UOE method precise forming, accurately control angular aperture, amount of compression, the tubing after shaping adopts the welding processs such as ratio-frequency welding, plasma weldering, argon arc welding to weld, and postwelding removes outer wall weld reinforcement;
(3) adopted by welded seam area intermediate frequency or other rapid heating modes to be heated to more than AC3, adopt the mould of sizing or pair of rollers tubing heating region to apply certain deformation along tubing circumference, thus the tissue of welded seam area is effectively controlled;
(4), after thermomechanical treatment, cooling is fast implemented in butt welded seam region, to guarantee to cool the tiny tissue of rear acquisition crystal grain; After deformation completes, the weld reinforcement after extruding is cleared up;
(5) full body is heated to two-phase region, and controlled cooling model is carried out to it, make tubing and welded seam area have close structure and properties.
3. the deformation heat treatment method of tubing lengthwise weld seam as claimed in claim 2, is characterized in that: the described type of cooling is water-cooled after air cooling to certain temperature, or is as cold as air cooling or sub-sectional cooling after certain temperature soon, comprises after being cooled to specified temp and being incubated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410674179.9A CN104388663A (en) | 2014-11-21 | 2014-11-21 | Thermomechanical treatment method of tube longitudinal welding seam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410674179.9A CN104388663A (en) | 2014-11-21 | 2014-11-21 | Thermomechanical treatment method of tube longitudinal welding seam |
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| Publication Number | Publication Date |
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| CN104388663A true CN104388663A (en) | 2015-03-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410674179.9A Pending CN104388663A (en) | 2014-11-21 | 2014-11-21 | Thermomechanical treatment method of tube longitudinal welding seam |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906347A (en) * | 2017-03-28 | 2017-06-30 | 中国石油天然气集团公司 | A kind of method for changing low-carbon micro steel-alloy seam organization and performance |
| CN108890087A (en) * | 2018-06-28 | 2018-11-27 | 山西太钢不锈钢股份有限公司 | A kind of welding method of S32750 super-duplex stainless steel welded tube |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215625A (en) * | 2008-01-18 | 2008-07-09 | 宝鸡石油钢管有限责任公司 | Deformation heat treatment method for modifying welding seam tissue capability |
| CN102424906A (en) * | 2011-12-14 | 2012-04-25 | 宝鸡石油钢管有限责任公司 | Method for optimizing weld seam structure and properties of HFW(High Frequency Welded) pipes |
| CN103131947A (en) * | 2013-03-21 | 2013-06-05 | 宝鸡石油钢管有限责任公司 | High-performance low-carbon microalloy steel SEW (hot stretch-reducing electric welding) expansion casing and manufacturing method thereof |
| CN103255345A (en) * | 2013-04-26 | 2013-08-21 | 宝鸡石油钢管有限责任公司 | 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and manufacturing method thereof |
-
2014
- 2014-11-21 CN CN201410674179.9A patent/CN104388663A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101215625A (en) * | 2008-01-18 | 2008-07-09 | 宝鸡石油钢管有限责任公司 | Deformation heat treatment method for modifying welding seam tissue capability |
| CN102424906A (en) * | 2011-12-14 | 2012-04-25 | 宝鸡石油钢管有限责任公司 | Method for optimizing weld seam structure and properties of HFW(High Frequency Welded) pipes |
| CN103131947A (en) * | 2013-03-21 | 2013-06-05 | 宝鸡石油钢管有限责任公司 | High-performance low-carbon microalloy steel SEW (hot stretch-reducing electric welding) expansion casing and manufacturing method thereof |
| CN103255345A (en) * | 2013-04-26 | 2013-08-21 | 宝鸡石油钢管有限责任公司 | 80ksi-steel-grade hydrogen sulfide stress corrosion resistant petroleum casing pipe and manufacturing method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106906347A (en) * | 2017-03-28 | 2017-06-30 | 中国石油天然气集团公司 | A kind of method for changing low-carbon micro steel-alloy seam organization and performance |
| CN106906347B (en) * | 2017-03-28 | 2019-02-19 | 中国石油天然气集团公司 | A method of changing low-carbon micro steel-alloy seam organization and performance |
| CN108890087A (en) * | 2018-06-28 | 2018-11-27 | 山西太钢不锈钢股份有限公司 | A kind of welding method of S32750 super-duplex stainless steel welded tube |
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Application publication date: 20150304 |