CN102400065A - High-toughness and ultra-high strength seamless steel pipe for oil well and manufacturing method thereof - Google Patents
High-toughness and ultra-high strength seamless steel pipe for oil well and manufacturing method thereof Download PDFInfo
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- CN102400065A CN102400065A CN201010276444XA CN201010276444A CN102400065A CN 102400065 A CN102400065 A CN 102400065A CN 201010276444X A CN201010276444X A CN 201010276444XA CN 201010276444 A CN201010276444 A CN 201010276444A CN 102400065 A CN102400065 A CN 102400065A
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Abstract
The invention discloses a high-toughness and ultra-high strength seamless steel pipe for oil well and a manufacturing method thereof. The steel contains the following chemical components of: by weight, 0.15-0.27% of C; Si being less than or equal to 0.30%; 0.20-0.50% of Mn; 0.85-1.45% of Cr; 0.40-1.2% of Mo; 0.08-0.20% of V; 0.01-0.05% of Als; P being less than or equal to 0.012%; S being less than or equal to 0.005%; H being less than or equal to 0.00015%; N being less than or equal to 0.0050%; O being less than or equal to 0.0040%; As+Sn+Pb+Sb+Bi being less than or equal to 0.0080%; and the balance being Fe. By a specific manufacturing process, the low alloy steel provided by the invention is prepared into a steel pipe, which is characterized by a mechanical property that the ratio of transverse notch CVN to yield strength is greater than or equal to 0.1, therefore raising the security of applying the ultra-high strength oil-well pipe with strength level of more than Q125 in deep wells and ultra-deep wells.
Description
Technical field
The invention belongs to low alloy steel and make the field, particularly a kind of superstrength weldless steel tube with H.T., but fuel feeding, gas field drilling oil and natural gas use.
Background technology
Along with the exploitation in a large number year by year of global crude oil, Sweet natural gas, the exploitation of shallow table oil reservoir can not have been satisfied the huge demand that increases day by day, and the D.D. in oil, gas field is in continuous intensification, and some local D.D. has reached six, seven kms, even darker.Along with the increase of well depth, geologic condition becomes complicated and harshness, and high temperature, highly compressed subsurface environment are had higher requirement to strong, the tough performance of oil well pipe in addition, and the highest grade of steel Q125 of API oil well pipe can not satisfy the request for utilization of these deep-wells, ultra deep well.At present, be badly in need of ys more than 125ksi, and the superstrength oil well pipe with low notch sensitivity that impelling strength is complementary with it.
Generally speaking, the high more then toughness of the intensity of steel is just low more, and the two is growth and decline each other, according to the fracture mechanics theory of strength, allows the critical size and the K of the tiny flaw of existence in the oil well pipe
ICWith σ
yRatio square relevant, promptly oil well pipe intensity is high more, needs the toughness of coupling also high more; The technical guidance document of British Department of Energy shows, when the ratio of the horizontal cut CVN of oil well pipe (J of unit) and ys (units MPa) more than or equal to 0.1 the time, the notch sensitivity of steel pipe could guarantee the safety of use; Be the oil well pipe of ys greater than 140ksi (980MPa); It need mate the above horizontal CVN of 98J, and the strong oil well pipe of existing in the market superelevation all is difficult to reach this requirement.
Summary of the invention
The object of the present invention is to provide a kind of superstrength oil well pipe and method of manufacture thereof with excellent toughness; The oil well pipe tubing of invention satisfies the technical guidance document requirement of British Department of Energy; The ratio of horizontal cut CVN and ys that is oil well pipe guarantees oil, gas field deep-well and the ultra deep well safe working needs to oil pipe more than or equal to 0.1.
High-ductility ultrahigh-strength oil well pipe composition of the present invention is stipulated as follows by weight percentage: C:0.15%～0.27%, Si :≤0.30%, Mn:0.20%～0.50%, Cr:0.85%～1.45%, Mo:0.40%～1.2%, V:0.08%～0.20%, Als:0.01%～0.05%; P≤0.012%; S≤0.005%; H: N≤0.00015%: O≤0.0050% :≤0.0040%, As+Sn+Pb+Sb+Bi≤0.0080%, all the other are Fe.
The explanation that each alloying element scope is selected:
C: the main effect of carbon is to improve hardening capacity; Can improve intensity with other carbide that adds up to element to form in the steel, carbon content is lower than 0.15%, and the hardening capacity of steel and intensity are difficult to guarantee; But carbon can play destruction to the toughness of steel, and carbon is higher than 0.27% toughness and is difficult to guarantee.For reaching the object of the invention, the preferred scope of C is 0.19%～0.25%.
Si: silicon here mainly has been desoxydatoin, but bigger to the toughness infringement, so it is limited to below 0.3%.
Mn: manganese can improve hardening capacity, is combined into MnS with S element in the steel, can avoid the hot short generation of steel; Simultaneously Mn can enlarge the austenitic area of steel, can crystal grain thinning, play the effect of the obdurability that improves steel; Content is lower than that effect in 0.2% o'clock is not obvious, and content surpasses at 0.5% o'clock, and the effect that impels harmful element to gather partially at crystal boundary begins obviously; Reduce the toughness of the strong oil well pipe steel of superelevation, make steel be prone to produce H 2 S stress corrosion simultaneously.
Cr: chromium improves hardening capacity, improves the obdurability of steel, and has anti-corrosion effect, and it is not enough to be lower than 0.85% o'clock toughness, is higher than at 1.45% o'clock, acts on not obviously, and more high-load chromium will increase the temper brittleness of steel.For reaching the object of the invention, the preferred scope of Cr is 1.00%～1.25%.
Mo: molybdenum improves hardening capacity, improves the resistance to tempering of steel, suppresses temper brittleness, and its crystal grain thinning effect is obvious, and bigger to the obdurability effect that improves steel, content is lower than 0.40%, and obdurability is difficult to meet the demands, and it is saturated to be higher than 1.20% effect, and cost increases.For reaching the object of the invention, the preferred scope of Mo is 0.65%～0.9%.
V: vanadium forms C, Nization thing, has the effect of crystal grain thinning, raising intensity, can improve the obdurability of steel, and content is lower than at 0.08% o'clock and does not reach requirement, and it is not obvious to be higher than effect in 0.20% o'clock, when content raises again toughness is played destruction.For reaching the object of the invention, the preferred scope of V is 0.10%～0.12%.
Als: aluminium adds as strong reductor on the one hand, but crystal grain thinning on the other hand improves the toughness of steel, and it is not enough that acid-soluble aluminum content is lower than effect in 0.01% o'clock in the steel, and it is saturated to be higher than 0.05% effect, and begins to damage the high temperature obdurability of steel.For reaching the object of the invention, the preferred scope of Al is 0.01%～0.035%.
The method of manufacture of product of the present invention is to press mentioned component and smelt, cast, make circular pipe blank, hot rolling tubulation, the steel pipe cooling; Carry out 900～950 ℃ normalizing treatment; Then carry out 870～920 ℃ shrend, again through 620～660 ℃ temper, tempering time 60～150 minutes.Steel pipe after the thermal treatment adopts the band temperature correction that is not less than 300 ℃ straight, the stress removing that aligning back steel pipe warp is 580～630 ℃.
Steel pipe after the thermal treatment also need pass through flaw detection.
Weldless steel tube through above-mentioned technology manufacturing has following performance:
Ys: 980-1150MPa tensile strength: 1040-1230MPa
Impelling strength: horizontal full-scale Charpy-V impact power (0 ℃)＞115J
Vertical full-scale Charpy-V impact power (0 ℃)＞115J
Unit elongation＞20%
Beneficial effect of the present invention is embodied in:
(1) uses ratio that the steel pipe of technology manufacturing of the present invention has high horizontal cut CVN and a ys more than or equal to 0.1 performance characteristics, can increase the safety in utilization of the strong oil well pipe of superelevation in deep-well, ultra deep well of the above intensity rank of Q125 greatly.
(2) the alloying constituent proportioning still belongs to the low alloy steel category, practices thrift cost.
(3) steel pipe of technology manufacturing of the present invention has high cleanliness, low unrelieved stress, characteristics that homogeneous microstructure is stable, has improved the anti-delayed fracture ability and the resistance to corrosion of steel pipe.
(4) steel pipe of technology manufacturing of the present invention adopts bloom continuous casting, tandem rolling circular pipe blank tubulation, and rolling compression ratio is big, has improved the obdurability of the matrix of steel, makes steel pipe can finally obtain comparatively ideal toughness proportioning.
(5) steel pipe of technology manufacturing of the present invention adopts the preceding normalizing mode uniform formation of thermal treatment, improves the transverse impact toughness value.
Embodiment
Steel alloy process converter smelting of the present invention, continuous casting, rolling circular pipe blank, steel pipe rolling and thermal treatment, aligning, stress removing, specific embodiment is referring to table 1, table 2.
Table 1 chemical ingredients
Table 2 processing parameter
Through table 1,2 design implementation; Make steel pipe obtain the above ys of 980MPa, the steel pipe of technology manufacturing of the present invention adopts the mode uniform formation of the preceding normalizing of modified thermal treatment, improves the transverse impact toughness value; Make steel pipe be equipped with very high impelling strength; The ratio of its horizontal cut CVN and ys is more than or equal to 0.1, and simultaneously, steel pipe has low unrelieved stress, characteristics that homogeneous microstructure is stable; Improve the anti-delayed fracture ability and the resistance to corrosion of steel pipe, increased the safety in utilization of the strong oil well pipe of superelevation in deep-well, ultra deep well of the above intensity rank of Q125 greatly.Table 3 is depicted as the mechanical property result of the embodiment of the invention.
Table 3 product performance
Claims (4)
1. strong oil well seamless steel pipe of H.T. superelevation; It is characterized in that: steel pipe chemical component weight per-cent is: C:0.15%～0.27%, Si :≤0.30%, Mn:0.20%～0.50%, Cr:0.85%～1.45%, Mo:0.40%～1.2%, V:0.08%～0.20%, Als:0.01%～0.05%; P≤0.012%; S≤0.005%; H: N≤0.00015%: O≤0.0050% :≤0.0040%, As+Sn+Pb+Sb+Bi≤0.0080%, all the other are Fe.
2. the strong oil well seamless steel pipe of H.T. superelevation as claimed in claim 1; It is characterized in that: steel pipe chemical component weight per-cent is: C:0.19%～0.25%, Cr:1.00%～1.25%, Mo:0.65%～0.9%, V:0.10%～0.12%, Als:0.01%～0.035%; P≤0.008%; S＜0.003%, H: N≤0.0001%: O≤0.0040% :≤0.0030%, As+Sn+Pb+Sb+Bi≤0.0040%.
3. method of manufacture that is used for claim 1 or the strong oil well seamless steel pipe of 2 described H.T. superelevation; It is characterized in that: press mentioned component and smelt, cast, make circular pipe blank, hot rolling tubulation; Steel pipe cools off, and carries out 900～950 ℃ normalizing treatment, carries out 870～920 ℃ shrend afterwards; Again through 620～660 ℃ temper, tempering time 60～150 minutes.
4. the method for manufacture of the strong oil well seamless steel pipe of H.T. superelevation according to claim 3 adopts the band temperature correction that is not less than 300 ℃ straight after the steel pipe thermal treatment, the stress removing that aligning back steel pipe warp is 580～630 ℃.
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| CN201010276444XA CN102400065A (en) | 2010-09-07 | 2010-09-07 | High-toughness and ultra-high strength seamless steel pipe for oil well and manufacturing method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703831A (en) * | 2012-05-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Cu-contained and Cr-controlled seamless steel tube for nuclear power station and production method for Cu-contained and Cr-controlled seamless steel tube |
| CN103510009A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Steel used for steam turbine auxiliary machinery of nuclear power unit and manufacturing method thereof |
| CN103614632A (en) * | 2013-12-10 | 2014-03-05 | 镇江市华阳机电制造有限公司 | Manufacturing method of submarine oil well valve base |
| CN104789882A (en) * | 2015-03-16 | 2015-07-22 | 天津欧派卡石油管材有限公司 | Production method of petroleum casing pipe |
| CN105907936A (en) * | 2016-05-10 | 2016-08-31 | 江苏沙钢集团有限公司 | Uniform phase structure and plate shape control method for high strength and toughness steel plate |
| CN105960479A (en) * | 2014-02-07 | 2016-09-21 | 新日铁住金株式会社 | High alloy for oil well use |
| CN109055873A (en) * | 2018-10-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111020370A (en) * | 2019-10-31 | 2020-04-17 | 鞍钢股份有限公司 | Single-layer wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof |
| CN114836691A (en) * | 2022-04-28 | 2022-08-02 | 鞍钢股份有限公司 | Seamless steel pipe for drilling and production and manufacturing method thereof |
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| CN1902330A (en) * | 2003-10-10 | 2007-01-24 | 特纳瑞斯连接股份公司 | Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same |
| CN101250671A (en) * | 2008-03-26 | 2008-08-27 | 天津钢管集团股份有限公司 | Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof |
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| CN1902330A (en) * | 2003-10-10 | 2007-01-24 | 特纳瑞斯连接股份公司 | Low carbon alloy steel tube having ultra high strength and excellent toughness at low temperature and method of manufacturing the same |
| CN101250671A (en) * | 2008-03-26 | 2008-08-27 | 天津钢管集团股份有限公司 | Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102703831A (en) * | 2012-05-22 | 2012-10-03 | 内蒙古包钢钢联股份有限公司 | Cu-contained and Cr-controlled seamless steel tube for nuclear power station and production method for Cu-contained and Cr-controlled seamless steel tube |
| CN103510009A (en) * | 2012-06-20 | 2014-01-15 | 鞍钢股份有限公司 | Steel used for steam turbine auxiliary machinery of nuclear power unit and manufacturing method thereof |
| CN103510009B (en) * | 2012-06-20 | 2016-01-20 | 鞍钢股份有限公司 | A kind of steam turbine auxiliary machinery of nuclear power unit steel and manufacture method thereof |
| CN103614632A (en) * | 2013-12-10 | 2014-03-05 | 镇江市华阳机电制造有限公司 | Manufacturing method of submarine oil well valve base |
| CN103614632B (en) * | 2013-12-10 | 2015-10-28 | 镇江市华阳机电制造有限公司 | A kind of manufacture method of sub-sea drilled wells valve base |
| CN105960479A (en) * | 2014-02-07 | 2016-09-21 | 新日铁住金株式会社 | High alloy for oil well use |
| CN104789882A (en) * | 2015-03-16 | 2015-07-22 | 天津欧派卡石油管材有限公司 | Production method of petroleum casing pipe |
| CN105907936A (en) * | 2016-05-10 | 2016-08-31 | 江苏沙钢集团有限公司 | Uniform phase structure and plate shape control method for high strength and toughness steel plate |
| CN109055873A (en) * | 2018-10-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method |
| CN110656287A (en) * | 2019-09-30 | 2020-01-07 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN110656287B (en) * | 2019-09-30 | 2021-02-23 | 鞍钢股份有限公司 | Seamless steel pipe for high-strength drill rod and manufacturing method thereof |
| CN111020370A (en) * | 2019-10-31 | 2020-04-17 | 鞍钢股份有限公司 | Single-layer wear-resistant seamless steel pipe for concrete pump truck and manufacturing method thereof |
| CN114836691A (en) * | 2022-04-28 | 2022-08-02 | 鞍钢股份有限公司 | Seamless steel pipe for drilling and production and manufacturing method thereof |
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Application publication date: 20120404 |