CN102268612A - X80 steel elbow with low temperature resistance and manufacturing process thereof - Google Patents
X80 steel elbow with low temperature resistance and manufacturing process thereof Download PDFInfo
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Abstract
The invention discloses an X80 steel elbow with low temperature resistance and a manufacturing process thereof. The X80 steel comprises the following components by weight percent: 0.05-0.10% of C, 0.10-0.30% of Si, 1.2-1.9% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, less than or equal to 0.05% of Al, 0.25-1.00% of Ni, 0.10-0.40% of Cr, 0.10-0.30% of Cu, 0.03-0.1% of V, 0.05-0.1% of Nb, 0.10-0.40% of Mo, 0.01-0.03% of Ti, less than or equal to 0.0005% of B and the balance of Fe. Ceq is controlled to 0.39-0.50% and Pcm is controlled to 0.15-0.25%. The induction heating and bending process is adopted, the moulded product is subjected to overall tempering heat treatment. The elbow disclosed by the invention has high yield strength and tensile strength and good low temperature resistance and is suitable for oil and gas pipelines in higher and colder places.
Description
Technical field
The present invention relates to a kind of bend pipe and manufacturing process thereof, low temperature resistant bend pipe of especially a kind of X80 steel and manufacturing process thereof.
Background technology
Along with the exploitation of resources such as the oil of severe cold areas, Sweet natural gas, various oil transportations, gas transmission line go into operation successively, and the requirement of conveying steel pipe is also improved constantly.Find by investigating us, transfering natural gas from the west to the east two wires pipework, Sino-Russian crude oil pipeline engineering etc., the lowest temperature can reach-45 ℃, and many oil and gas pipes need expose under the outside atmosphere of cold is on active service.From now on, will build a large amount of pipelines at extremely frigid zones, huge to the potential of demand of low temperature bend pipe.Therefore, exploitation low temperature bend pipe has boundless market application foreground.
Present domestic pipe line steel bend pipe major part is being used under the envrionment temperature more than-35 ℃, and is being lower than under-35 ℃ the envrionment temperature, the mechanical property of bend pipe, and especially the toughness of bend pipe body weld seam and hot-zone obviously descends.Chinese invention patent (patent No.: ZL 200710185348.2) discloses a kind of X80 steel bend pipe and bending technique thereof, and its performance reaches intensity greater than 555MPa, but resistance to low temperature is difficult to reach the requirement of transfering natural gas from the west to the east to pipeline.
Summary of the invention
The technical problem to be solved in the present invention provides has yield strength and the low temperature resistant bend pipe of a kind of X80 steel and the manufacturing process thereof of advantage such as tensile strength is big, resistance to low temperature is good.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
The weight percent of described X80 steel consists of: C 0.05-0.10%, Si 0.10-0.30%, Mn 1.2-1.9%, P≤0.020%, S≤0.010%, Al≤0.05%, Ni 0.25-1.0%, Cr 0.1-0.40%, Cu 0.1-0.30%, V 0.03-0.1%, Nb 0.05-0.1%, Mo 0.1-0.40%, Ti 0.01-0.03%, B≤0.0005%, surplus are Fe; Control carbon equivalent Ceq 0.39-0.50%, cold cracking FACTOR P cm 0.15-0.25%.
The caliber of the low temperature resistant bend pipe of described X80 steel is that 406～1422mm, wall thickness are that 10～40mm, radius-of-curvature are 2～14.2m.
The manufacturing process of the low temperature resistant bend pipe of described X80 steel is to adopt X80 steel controlled rolling steel plate to make steel pipe, uses the induction heating bending process, induction heating temperature is 1000～1200 ℃, bends speed 20～80mm/min, after the steel pipe heating bends, water spray cooling rapidly, speed of cooling is not less than 15 ℃/s.Carry out whole tempering heat treatment after the bend pipe moulding, tempering temperature: 500-650 ℃, soaking time is 60-90min.
In the composition of X80 steel of the present invention, total alloy content of C and alloying element such as Mn, Mo, Ni, Cu, Nb etc. must be greater than 0.39% by carbon equivalent Ceq, wherein C content must be greater than 0.5%, guarantee that the bend pipe material has high hardening capacity, obtain bainite structure or bainite+martensitic stucture thereby guarantee to bend the cooling back.In order to guarantee that bend pipe body, weld seam and heat affected zone all have higher low-temperature impact-resistant performance, so suitably improve Ni content, reduce the low temperature brittleness transition temperature of steel, its Ni content can not be lower than 0.2%.But because bend pipe when practice of construction, also needs to dock welding with pipeline steel tube, its weldability also is the key issue that pay attention to, therefore, its total alloy content must be less than 0.50% by carbon equivalent Ceq, and wherein C content must be less than 0.10%, and Ni content must be not more than 1.0%.
The X80 steel bend pipe adopts the induction heating bending process; the induction heating flexure temperature need be controlled in 1000～1200 ℃ of scopes, and when temperature was too high, austenite crystal can be grown up rapidly; the bainite structure crystal grain that obtains after causing quenching is thick, reduces the low-temperature impact toughness of bend pipe.Cross when low when temperature, it is saturating to cause bend pipe body wall thickness center to be burnt, and the wall thickness center intensity is reduced, and reduces the intensity of bend pipe body.
The speed that bends reduces with the increase of wall thickness, has both increased the heat-up time of thick walled steel tube, grills thoroughly fully to guarantee it.Speed of cooling is the key factor of the final performance of influence, should be controlled at and be not less than 15 ℃/s, to guarantee to obtain bainite structure or bainite+martensitic stucture.
Adopt the beneficial effect that technique scheme produced to be:
1. overcome the made bend pipe of common X80 steel under-40 to-45 ℃ of environment, bend pipe body and Weld Performance reduce, and the low-temperature impact toughness of corner bead and heat affected zone especially can not satisfy the shortcoming of the on-the-spot service requirements under the low temperature environment.
2. the made bend pipe yield strength of the present invention is greater than 555Mpa, tensile strength is greater than 625Mpa,-45 ℃ of bend pipe body low-temperature impact toughness mean values are greater than 90J, the low-temperature impact toughness mean value of weld seam and heat affected zone is greater than 75J, satisfy the technical requirements of X80 bend pipe fully, for being fit to X80 steel and the bend pipe that severe cold areas oil, natural-gas transfer pipeline are used.
3. bend pipe has high hardening capacity, obtains bainite structure or bainite+martensitic stucture thereby guarantee to bend the cooling back.
Embodiment
Embodiment 1
Steel plate is pricked in X80 control by chemical ingredients shown in the table 1, adopts vertical masonry joint union-melt weld to make the steel pipe of F1016 * 32mm, and making radius-of-curvature on tube-bending machine is the 6096mm bend pipe.
Table 1 X80 steel chemical composition table (surplus is Fe)
| C | Si | Mn | P | S | Al | Ni | Cr |
| 0.05% | 0.10% | 1.7% | 0.010% | 0.007% | 0.03% | 0.40% | 0.10% |
| Cu | V | Nb | Mo | Ti | B | Ceq | Pcm |
| 0.10% | 0.03% | 0.05% | 0.15% | 0.01% | 0.0001% | 0.39% | 0.21% |
Bending technique is: 1100 ± 20 ℃ of temperature, speed are 35 ± 2mm/min, the water spray cooling, and speed of cooling is not less than 15 ℃/s, tempering temperature: 550 ℃, soaking time 60min.The bend pipe performance test results is as shown in table 2.
Table 2 bend pipe performance test result
| Specimen types | Yield strength (MPa) | Tensile strength (MPa) | Gap position | -45 ℃ of ballistic works; J |
| The body longitudinal stretching | 590 | 665 | The bend pipe body | 235/225/190 |
| The body cross directional stretch | 575 | 660 | Corner bead | 85/80/90 |
| The weld seam cross directional stretch | —— | 663 | The bend pipe hot-zone | 145/150/165 |
Embodiment 2
Steel plate is pricked in X80 control by chemical ingredients shown in the table 3, adopts vertical masonry joint union-melt weld to make the steel pipe of F1422 * 40mm, and making radius-of-curvature on tube-bending machine is the 14200mm bend pipe.
Table 3 X80 steel chemical composition table (surplus is Fe)
| C | Si | Mn | P | S | Al | Ni | Cr |
| 0.08% | 0.15% | 1.9% | 0.005% | 0.010% | 0.035% | 0.25% | 0.10% |
| Cu | V | Nb | Mo | Ti | B | Ceq | Pcm |
| 0.15% | 0.05% | 0.05% | 0.10% | 0.02% | 0.0002% | 0.41% | 0.23% |
Bending technique is: 1120 ± 20 ℃ of temperature, speed are 22 ± 2mm/min, the water spray cooling, and speed of cooling is not less than 15 ℃/s, tempering temperature: 650 ℃, soaking time 70min.The bend pipe performance test results is as shown in table 4.
Table 4 bend pipe performance test result
| Specimen types | Yield strength (MPa) | Tensile strength (MPa) | Gap position | -45 ℃ of ballistic works; J |
| The body longitudinal stretching | 585 | 675 | The bend pipe body | 205/225/190 |
| The body cross directional stretch | 570 | 645 | Corner bead | 95/90/110 |
| The weld seam cross directional stretch | —— | 680 | The bend pipe hot-zone | 155/150/115 |
Embodiment 3
Steel plate is pricked in X80 control by chemical ingredients shown in the table 5, adopts vertical masonry joint union-melt weld to make the steel pipe of F508 * 10mm, and making radius-of-curvature on tube-bending machine is the 3048mm bend pipe.
Table 5 X80 steel chemical composition table (surplus is Fe)
| C | Si | Mn | P | S | Al | Ni | Cr |
| 0.06% | 0.30% | 1.5% | 0.020% | 0.003% | 0.02% | 1.0 % | 0.20% |
| Cu | V | Nb | Mo | Ti | B | Ceq | Pcm |
| 0.20% | 0.06% | 0.08% | 0.20% | 0.01% | 0.0003% | 0.50% | 0.18% |
Bending technique is: 1020 ± 20 ℃ of temperature, speed are 78 ± 2mm/min, the water spray cooling, and speed of cooling is not less than 15 ℃/s, tempering temperature: 500 ℃, soaking time 80min.The bend pipe performance test results is as shown in table 6.
Table 6 bend pipe performance test result
| Specimen types | Yield strength (MPa) | Tensile strength (MPa) | Gap position | -45 ℃ of ballistic works; J |
| The body longitudinal stretching | 630 | 720 | The bend pipe body | 190/180/145 |
| The body cross directional stretch | 600 | 705 | Corner bead | 85/90/85 |
| The weld seam cross directional stretch | —— | 690 | The bend pipe hot-zone | 145/120/105 |
Embodiment 4
Steel plate is pricked in X80 control by chemical ingredients shown in the table 7, adopts vertical masonry joint union-melt weld to make the steel pipe of F406 * 25mm, and making radius-of-curvature on tube-bending machine is the 2000mm bend pipe.
Table 7 X80 steel chemical composition table (surplus is Fe)
| C | Si | Mn | P | S | Al | Ni | Cr |
| 0.07% | 0.20% | 1.3% | 0.009% | 0.005% | 0.01% | 0.50% | 0.30% |
| Cu | V | Nb | Mo | Ti | B | Ceq | Pcm |
| 0.25% | 0.08% | 0.08% | 0.40% | 0.03% | 0.0003% | 0.45% | 0.25% |
Bending technique is: 1060 ± 20 ℃ of temperature, speed are 45 ± 2mm/min, the water spray cooling, and speed of cooling is not less than 15 ℃/s, tempering temperature: 620 ℃, soaking time 90min.The bend pipe performance test results is as shown in table 8.
Table 8 bend pipe performance test result
| Specimen types | Yield strength (MPa) | Tensile strength (MPa) | Gap position | -45 ℃ of ballistic works; J |
| The body longitudinal stretching | 620 | 690 | The bend pipe body | 175/155/160 |
| The body cross directional stretch | 610 | 695 | Corner bead | 95/90/90 |
| The weld seam cross directional stretch | —— | 675 | The bend pipe hot-zone | 115/110/95 |
Embodiment 5
Steel plate is pricked in X80 control by chemical ingredients shown in the table 9, adopts vertical masonry joint union-melt weld to make the steel pipe of F813 * 26mm, and making radius-of-curvature on tube-bending machine is the 4878mm bend pipe.
Table 9 X80 steel chemical composition table (surplus is Fe)
| C | Si | Mn | P | S | Al | Ni | Cr |
| 0.10% | 0.25% | 1.2% | 0.015% | 0.007% | 0.05% | 0.75% | 0.40% |
| Cu | V | Nb | Mo | Ti | B | Ceq | Pcm |
| 0.30% | 0.10% | 0.10% | 0.30% | 0.03% | 0.0005% | 0.47% | 0.15% |
Bending technique is: 1180 ± 20 ℃ of temperature, speed are 50 ± 2mm/min, the water spray cooling, and speed of cooling is not less than 15 ℃/s, tempering temperature: 600 ℃, soaking time 70min.The bend pipe performance test results is as shown in table 10.
Table 10 bend pipe performance test result
| Specimen types | Yield strength (MPa) | Tensile strength (MPa) | Gap position | -45 ℃ of ballistic works; J |
| The body longitudinal stretching | 622 | 715 | The bend pipe body | 180/150/165 |
| The body cross directional stretch | 615 | 700 | Corner bead | 95/90/100 |
| The weld seam cross directional stretch | —— | 695 | The bend pipe hot-zone | 110/125/105 |
By bend pipe performance test result as can be known, the made low temperature resistant bend pipe yield strength of the present invention is greater than 555Mpa, tensile strength is greater than 625Mpa,-45 ℃ of bend pipe body low-temperature impact toughness mean values are greater than 90J, the low-temperature impact toughness mean value of weld seam and heat affected zone satisfies the technical requirements of X80 bend pipe fully greater than 75J.
Claims (3)
1. low temperature resistant bend pipe of X80 steel, made by the X80 steel, it is characterized in that the weight percent of described X80 steel consists of: C 0.05-0.10%, Si 0.10-0.30%, Mn 1.2-1.9%, P≤0.020%, S≤0.010%, Al≤0.05%, Ni 0.25-1.00%, Cr 0.1-0.40%, Cu 0.10-0.30%, V 0.03-0.1%, Nb 0.05-0.1%, Mo 0.1-0.40%, Ti 0.01-0.03%, B≤0.0005%, surplus are Fe; Control Ceq 0.39-0.50%, Pcm 0.15-0.25%.
2. the low temperature resistant bend pipe of a kind of X80 steel according to claim 1, the caliber that it is characterized in that described X80 steel bend pipe is 406-1422mm, and wall thickness is 10-40mm, and radius-of-curvature is 2-14.2m.
3. the manufacturing process of the low temperature resistant bend pipe of a kind of X80 steel according to claim 1 and 2, it is characterized in that adopting X80 steel controlled rolling steel plate to make steel pipe, use the induction heating bending process, induction heating temperature is 1000～1200 ℃, bends speed 20～80mm/min, and the steel pipe heating bends back water spray cooling rapidly, speed of cooling is not less than 15 ℃/s, carry out whole tempering heat treatment after the bend pipe moulding, tempering temperature: 500-650 ℃, soaking time 60-90min.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755239A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气集团公司 | Method for improving low-temperature impact toughness of large-diameter large-wall-thickness high-strength hot-bent pipe |
| CN107893200A (en) * | 2017-10-23 | 2018-04-10 | 扬州市管件厂有限公司 | Low temperature resistant big diameter elbow and its manufacture method |
| CN108048747A (en) * | 2018-01-30 | 2018-05-18 | 四川石油天然气建设工程有限责任公司 | A kind of Hi-grade steel bend pipe and preparation method |
| CN108239720A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气集团公司 | A kind of X80 steel, X80 steel plates and its preparation method of threeway |
| CN110306120A (en) * | 2018-03-20 | 2019-10-08 | 中国石油天然气集团有限公司 | A kind of X80 steel-grade D1422mm seamless steel elbow and its manufacturing method |
| CN116005071A (en) * | 2022-12-27 | 2023-04-25 | 南阳汉冶特钢有限公司 | X80 crack-arrest steel plate and production method thereof |
| CN116770198A (en) * | 2023-08-25 | 2023-09-19 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
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| 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 |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105755239A (en) * | 2014-12-17 | 2016-07-13 | 中国石油天然气集团公司 | Method for improving low-temperature impact toughness of large-diameter large-wall-thickness high-strength hot-bent pipe |
| CN105755239B (en) * | 2014-12-17 | 2018-07-13 | 中国石油天然气集团公司 | The method for improving the high-strength hot-bending bends low-temperature impact toughness of heavy caliber thick wall |
| CN108239720A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气集团公司 | A kind of X80 steel, X80 steel plates and its preparation method of threeway |
| CN108239720B (en) * | 2016-12-27 | 2019-11-12 | 中国石油天然气集团公司 | A kind of X80 steel, X80 steel plate and its preparation method of threeway |
| CN107893200A (en) * | 2017-10-23 | 2018-04-10 | 扬州市管件厂有限公司 | Low temperature resistant big diameter elbow and its manufacture method |
| CN108048747A (en) * | 2018-01-30 | 2018-05-18 | 四川石油天然气建设工程有限责任公司 | A kind of Hi-grade steel bend pipe and preparation method |
| CN110306120A (en) * | 2018-03-20 | 2019-10-08 | 中国石油天然气集团有限公司 | A kind of X80 steel-grade D1422mm seamless steel elbow and its manufacturing method |
| CN116005071A (en) * | 2022-12-27 | 2023-04-25 | 南阳汉冶特钢有限公司 | X80 crack-arrest steel plate and production method thereof |
| CN116005071B (en) * | 2022-12-27 | 2024-05-24 | 南阳汉冶特钢有限公司 | X80 crack-arrest steel plate and production method thereof |
| CN116770198A (en) * | 2023-08-25 | 2023-09-19 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
| CN116770198B (en) * | 2023-08-25 | 2023-11-03 | 张家港宏昌钢板有限公司 | Steel plate for low-compression-ratio hydropower and preparation method thereof |
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Effective date of registration: 20201010 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee after: JULONG STEEL PIPE Co.,Ltd. Address before: 300457, No. 3, Tianjin Binhai service outsourcing industry park, No. 19 West Ring Road, Tianjin, Tanggu Patentee before: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee before: JULONG STEEL PIPE Co.,Ltd. |