CN102560287A - X90 steel bent pipe and bending method thereof - Google Patents
X90 steel bent pipe and bending method thereof Download PDFInfo
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- CN102560287A CN102560287A CN2012100531088A CN201210053108A CN102560287A CN 102560287 A CN102560287 A CN 102560287A CN 2012100531088 A CN2012100531088 A CN 2012100531088A CN 201210053108 A CN201210053108 A CN 201210053108A CN 102560287 A CN102560287 A CN 102560287A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention discloses an X90 steel bent pipe, and belongs to the field of manufacturing of bent pipes. X90 steel comprises the following chemical components by mass percentage: 0.06-0.10 percent of C, 0.1-0.3 percent of Si, 1.4-2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.01 percent of S, 0.08-0.6 percent of Cr, 0.1-0.5 percent of Mo, 0-0.3 percent of Cu, 0.15-0.5 percent of Ni, 0.03-0.11 percent of Nb, 0-0.06 percent of Ti, 0.02-0.10 percent of V and 0.17-0.25 percent of Pcm. The bending method comprises the steps of manufacturing a steel pipe with a controlled-rolled X90 steel plate, and then bending the steel pipe in an induction heating process. The strength of the bend pipe is greater than 625 MPa; the low-temperature impact toughness of a parent material is greater than 100 J; the low-temperature impact toughness of a welding seam is greater than 75 J; requirements of the X90 steel bent pipe can be met; and the X90 steel bent pipe can be used as a bent pipe for petroleum and natural gas conveying pipelines.
Description
Technical field
The present invention relates to a kind of X90 steel bend pipe and bending method thereof, belong to bend pipe and make the field.
Background technology
Bend pipe can adopt ERW as requested, and the heavy caliber bend pipe mainly to adopt ERW, present large-scale bend pipe production be the X80 bend pipe, particularly less to the bend pipe more than the X80 steel to the big thick-wall bend research of X90 steel.
Steel pipe's production only can be accomplished after the moulding through steel plate and the welding; The performance of steel pipe depends on steel plate itself and weldprocedure; And steel plate is the controlled rolling and controlled cooling production through the advanced person, and hot-work and thermal treatment organically combine, and has guaranteed steel plate so that steel pipe reaches high combination of strength and toughness.But the production of bend pipe is obviously different with steel pipe's production, and steel plate in the process of bending, also needs twice heat-processed after steel pipe is processed in weldering, must cause the variation of controlled rolling and controlled cooling steel plate tissue and the reduction of performance.Bend the back and adopt the water spray cooling; Though can reduce the degree of degradation to a certain extent, because the restriction of the continuous space condition of heating and cooling, so effect can be very not remarkable; So the bend pipe that adopts common X90 steel tube bending to become is difficult to reach X90 steel performance demands; Patent 201110043719.X discloses a kind of X90 steel and made bend pipe, but carbon content is higher in the composition of steel, and the weldability when bend pipe and pipe line steel weld is poor.Heating temperature and speed of cooling can directly influence the room temperature texture and the performance, particularly thick-wall bend of material in addition, because speed of cooling is low excessively, can cause the performance of bend pipe significantly to reduce.
Summary of the invention
The technical problem that the present invention will solve provides a kind of X90 steel bend pipe and bending method thereof, and bend pipe of the present invention can satisfy the technical requirements of X90 steel bend pipe, good manufacturability fully.
The technical scheme that the present invention taked is: a kind of X90 steel bend pipe, and the mass percent of X90 steel consists of:
C 0.06～0.10%, and Si 0.1～0.3%, and Mn 1.4～2.0%, P≤0.015%; S≤0.01%, Cr 0.08～0.6%, and Mo 0.1～0.5%; Cu 0～0.3%, and Ni 0.15～0.5%, and Nb 0.03～0.11%; Ti 0～0.06%, and V 0.02～0.10%, control Pcm 0.17～0.25%.
The caliber of bend pipe is that 406～1422mm, wall thickness are that 12～40mm, radius-of-curvature are 2～12m.
The bending method of X90 steel bend pipe is to adopt X90 steel controlled rolling steel plate to make steel pipe, adopts the induction heating bending method again, and induction heating temperature is 930～1150 ℃, and the induction heating frequency is 500～1500Hz, and the speed of bending is 20～80mm/s.
Adopt the beneficial effect that technique scheme produced to be: X90 steel of the present invention; Total alloy content of C and alloying element such as Mn, Mo, Ni, Cu, Nb etc. is pressed carbon equivalent Ceq greater than 0.43%; Wherein C content is greater than 0.06%; Thereby guarantee that the bend pipe material has high hardening capacity, obtain bainite structure or bainite+martensitic stucture thereby guarantee to bend the cooling back; C content can guarantee the weldability when bend pipe and pipe line steel weld less than 0.10%.
It is 930 ℃ that bend pipe of the present invention bends in the process heating minimum temperature, and because of steel grade provided by the invention, carbon content is lower; And contain a large amount of strong carbide forming elements; If temperature is lower than 930 ℃, can be insufficient because of austenitizing, fully solid solutions of carbide such as Ti, Nb, V; Make carbon and the containing quantity not sufficient of alloying element in the austenite and cause hardening capacity to reduce, performance is not enough; When if temperature surpasses 1150 ℃, austenite crystal takes place to grow up unusually, the performance of bend pipe is reduced, so heating and temperature control is in 930～1150 ℃ of TRs.
In the bending technique, the adding low frequency is too low, and then electric current is big, and is too high to the requirement of equipment aspect, there is no need.The ratio-frequency heating surface action causes the heating thickness low LCL, so select 500～1500Hz.
Bend pipe of the present invention, intensity are greater than 625MPa, and the mother metal low-temperature impact toughness is greater than 100J, and the weld seam low-temperature impact toughness can satisfy the technical requirements of X90 steel bend pipe fully greater than 75J, and good manufacturability can be used as the bend pipe that oil, natural-gas transfer pipeline are used.
Embodiment
Embodiment 1
Steel plate is pricked in the made X90 control of following table 1 chemical ingredients, adopts vertical masonry joint union-melt weld to process the steel pipe of F1016 * 21mm, and on tube-bending machine, processing radius-of-curvature is the 6096mm bend pipe.
Table 1
Bending method is: 1080 ± 20 ℃ of induction heating temperatures, induction heating frequency are 700Hz, and the speed of bending is 35 ± 2mm/min, the water spray cooling.Bend pipe performance test results such as following table 2, performance reaches the technical indicator of X90 steel bend pipe defined.
Table 2
Embodiment 2
Steel plate is pricked in the made X90 control of following table 3 chemical ingredientss, adopts vertical masonry joint union-melt weld to process the steel pipe of F1422 * 40mm, and on tube-bending machine, processing radius-of-curvature is the 8532mm bend pipe.
Table 3
Bending method is: 1130 ± 20 ℃ of induction heating temperatures, induction heating frequency are 1000Hz, and the speed of bending is 22 ± 2mm/min, the water spray cooling.Bend pipe performance test results such as following table 4, performance reaches the technical indicator of X90 steel bend pipe defined.
Table 4
Embodiment 3
Steel plate is pricked in the made X90 control of following table 5 chemical ingredientss, adopts vertical masonry joint union-melt weld to process the steel pipe of F406.4 * 12mm, and on tube-bending machine, processing radius-of-curvature is the 2438mm bend pipe.
Table 5
Bending method is: 950 ± 20 ℃ of induction heating temperatures, induction heating frequency are 800Hz, and the speed of bending is 55 ± 5mm/min, the water spray cooling.Bend pipe performance test results such as following table 6, performance reaches the technical indicator of X90 steel bend pipe defined.
Table 6
Embodiment 4
Steel plate is pricked in the made X90 control of following table 7 chemical ingredientss, adopts vertical masonry joint union-melt weld to process the steel pipe of F1219 * 32mm, and on tube-bending machine, processing radius-of-curvature is the 7314mm bend pipe.
Table 7
Bending method is: 1100 ± 20 ℃ of induction heating temperatures, induction heating frequency are 900Hz, and the speed of bending is 35 ± 2mm/min, the water spray cooling.Bend pipe performance test results such as following table 8, performance reaches the technical indicator of X90 steel bend pipe defined.
Table 8
Embodiment 5
Steel plate is pricked in the made X90 control of following table 9 chemical ingredientss, adopts vertical masonry joint union-melt weld to process the steel pipe of F813 * 26.2mm, and on tube-bending machine, processing radius-of-curvature is the 4878mm bend pipe.
Table 9
Bending method is: 1050 ± 20 ℃ of induction heating temperatures, induction heating frequency are 1000Hz, and the speed of bending is 70 ± 10mm/min, the water spray cooling.Bend pipe performance test results such as following table 10, performance reaches the technical indicator of X90 steel bend pipe defined.
Table 10
Claims (3)
1. an X90 steel bend pipe is characterized in that, the mass percent of X90 steel consists of:
C 0.06～0.10%, and Si 0.1～0.3%, and Mn 1.4～2.0%, P≤0.015%; S≤0.01%, Cr 0.08～0.6%, and Mo 0.1～0.5%; Cu 0～0.3%, and Ni 0.15～0.5%, and Nb 0.03～0.11%; Ti 0～0.06%, and V 0.02～0.10%, control Pcm 0.17～0.25%.
2. X90 steel bend pipe as claimed in claim 1 is characterized in that, the caliber of bend pipe is that 406～1422mm, wall thickness are that 12～40mm, radius-of-curvature are 2～12m.
3. according to claim 1 or claim 2 the bending method of X90 steel bend pipe is to adopt X90 steel controlled rolling steel plate to make steel pipe, adopts the induction heating bending method again; It is characterized in that; Induction heating temperature is 930～1150 ℃, and the induction heating frequency is 500～1500Hz, and the speed of bending is 20～80mm/s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100531088A CN102560287A (en) | 2012-03-02 | 2012-03-02 | X90 steel bent pipe and bending method thereof |
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| CN2012100531088A CN102560287A (en) | 2012-03-02 | 2012-03-02 | X90 steel bent pipe and bending method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567940A (en) * | 2015-12-23 | 2016-05-11 | 北京有色金属研究总院 | Method for improving flaring and bending deformation resisting capacity of metal pipe |
| CN108588348A (en) * | 2018-04-23 | 2018-09-28 | 西南石油大学 | A kind of high-strength steel heating bend manufacturing method and system |
| CN109023068A (en) * | 2018-09-04 | 2018-12-18 | 鞍钢股份有限公司 | Steel plate for VC (polyvinyl chloride) nanoparticle reinforced X90 plastic pipe and manufacturing method thereof |
| CN109136756A (en) * | 2018-09-04 | 2019-01-04 | 鞍钢股份有限公司 | NbC nanoparticle reinforced X90 plastic pipe steel plate and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200790A (en) * | 2006-12-12 | 2008-06-18 | 辽阳石化机械设计制造有限公司 | Oil-gas transportation large-scale high-pressure pipe fittings steel as well as pipes, pipe fittings and welding materials produced thereby |
| CN101205587A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing high-strength X80 steel spiral welded pipe |
| CN101205593A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | X80 steel bend pipe and bending technique thereof |
-
2012
- 2012-03-02 CN CN2012100531088A patent/CN102560287A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200790A (en) * | 2006-12-12 | 2008-06-18 | 辽阳石化机械设计制造有限公司 | Oil-gas transportation large-scale high-pressure pipe fittings steel as well as pipes, pipe fittings and welding materials produced thereby |
| CN101205587A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | Method for manufacturing high-strength X80 steel spiral welded pipe |
| CN101205593A (en) * | 2007-12-10 | 2008-06-25 | 华北石油管理局第一机械厂 | X80 steel bend pipe and bending technique thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105567940A (en) * | 2015-12-23 | 2016-05-11 | 北京有色金属研究总院 | Method for improving flaring and bending deformation resisting capacity of metal pipe |
| CN105567940B (en) * | 2015-12-23 | 2017-08-25 | 北京有色金属研究总院 | A kind of method for improving the anti-enlarging crooked deformability of metal pipe material |
| CN108588348A (en) * | 2018-04-23 | 2018-09-28 | 西南石油大学 | A kind of high-strength steel heating bend manufacturing method and system |
| CN109023068A (en) * | 2018-09-04 | 2018-12-18 | 鞍钢股份有限公司 | Steel plate for VC (polyvinyl chloride) nanoparticle reinforced X90 plastic pipe and manufacturing method thereof |
| CN109136756A (en) * | 2018-09-04 | 2019-01-04 | 鞍钢股份有限公司 | NbC nanoparticle reinforced X90 plastic pipe steel plate and manufacturing method thereof |
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Application publication date: 20120711 |