CN102140610A - Steel suitable for drill rod joint in low-temperature environment and heat treatment process of steel - Google Patents
Steel suitable for drill rod joint in low-temperature environment and heat treatment process of steel Download PDFInfo
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- CN102140610A CN102140610A CN2011100545885A CN201110054588A CN102140610A CN 102140610 A CN102140610 A CN 102140610A CN 2011100545885 A CN2011100545885 A CN 2011100545885A CN 201110054588 A CN201110054588 A CN 201110054588A CN 102140610 A CN102140610 A CN 102140610A
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Abstract
The invention relates to steel suitable for a drill rod joint in a low-temperature environment and a heat treatment process of the steel. The steel used for a drill rod joint comprises the following components by weight percent: C 0.25-0.35%, Mn 0.50-1.00%, P<=0.015%, S<=0.008%, Mo 0.15-1.00%, Ni 0.75-1.50%, Cr 0.80-1.50%, two or more of Si<=0.30%, Al<=0.03%, V<=0.10%, Ti<=0.03% and Re<=0.005%, and the balance of Fe and inevitable trace elements. The heat treatment process of the steel suitable for a drill rod joint is as follows: heating the steel in a furnace to 900-960 DEG C; carrying out heat insulation for 1.0-1.5 hours; putting the steel into a quenching medium and cooling down completely; tempering at the temperature of 660-690 DEG C; carrying out heat insulation for about 2.0-2.5 hours; and then taking the steel out of the furnace. After the steel is treated according to the process, when the yield strength of the steel is 905MPa, longitudinal and full-size charpy impact power average value at -60 DEG C is 110J, the fracture fiber rate is 100% on the average, and the ductile-brittle transition temperature is -85 DEG C.
Description
Technical field
The present invention relates to a kind of drill pipe sub steel that can under low temperature environment, use, belong to the oil and gas technical field.
Background technology
Along with development of global economy, to the petroleum and natural gas be representative the energy demand and rely on increasingly, the energy plays a part very important to the development of country, the people's life.For obtaining more multipotency source, oil drilling turns to more rigorous environment by conventional drilling, such as ultra deep well, deep-sea, ultra-low temperature surroundings etc.Investigation report shows, abundant hydrocarbon resources is being contained in the north polar circle, some countries allow to exploit hydrocarbon resources in succession under this psychro-environment, but its temperature is low to moderate-60 ℃, if in these extremely frigid zones operations, drilling rod must have good low-temperature flexibility (comprising two indexs of ballistic work and ductile-brittle transition temperature), to avoid the low temperature brittleness fracture accident.And drilling rod is formed by joint and joint friction welding usually, and this also just requires joint, joint and weld seam all to have good low-temperature flexibility.
According to the ultimate principle of Metallkunde as can be known, differing materials uses at low temperature environment, has different cold short tendencies, and drill pipe sub material commonly used at present belongs to body centered structure, have tangible cold short tendency, and intensity is high more, and cold short tendency is obvious more.Test-results shows that joint material commonly used such as 37CrMnMo are when its yield strength is 900MPa, along with impact test temperature drops to-60 ℃ by normal temperature, ballistic work is dropped to about 40J by 100J, and ductile-brittle transition temperature is about-50 ℃, can't satisfy-60 ℃ of environment service requirementss.
Summary of the invention
The object of the present invention is to provide a kind of drill pipe sub steel and thermal treatment process thereof that is applicable in low temperature environment, can overcome the existing described weak point of drill pipe sub material, also improved the low-temperature flexibility deposit.When its yield strength was 905MPa ,-60 ℃, vertically, full-scale, Charpy-V impact power mean value was 110J, has improved 2 times nearly than common drill pipe sub, and ductile-brittle transition temperature is-85 ℃.About 35 ℃ have been reduced than common drill pipe sub.
Described purpose is achieved by the following scheme:
A kind of drill pipe sub steel that is applicable to low temperature environment is grouped into by the one-tenth of following weight per-cent: C 0.25-0.35%, Mn 0.50-1.00%, P≤0.015%, S≤0.008%, Mo 0.15-1.00%, Ni 0.75-1.50%, Cr 0.80-1.50%, in addition, also contain Si≤0.30%, Al≤0.03%, V≤0.10%, Ti≤0.03%, in RE≤0.03% two or more, surplus are Fe and the trace elements that can not remove.
Preferentially, described drill pipe sub is grouped into the one-tenth of steel by following weight per-cent: C 0.25-0.28%, and Mn 0.50-0.70%, P 0.008%, S 0.004%, Mo 0.6-0.8%, Ni 1.20-1.50%, Cr 0.80-1.00%, Si 0.25-0.30%, Al 0.02%, V 0.04-0.10%; Surplus is Fe and the trace elements that can not remove.
Another optimal way is as follows, and described drill pipe sub is grouped into the one-tenth of steel by following weight per-cent: C 0.28-0.34%, Mn 0.75-1.0%, P≤0.015%, S≤0.005%, Mo 0.10-0.30%, Ni 0.90-1.10%, Cr 0.95-1.40%, Si 0.23%, and Ti 0.02%, and Re 0.02%; Surplus is Fe and the trace elements that can not remove.
Described low temperature environment is meant-20 ℃ to-60 ℃.
Described drill pipe sub with Heat Treatment Of Steel technology is: with behind the mentioned component uniform mixing in stove internal heating to 900～960 ℃, be incubated after 1.0～1.5 hours, put into quenchant and fully cooling,, come out of the stove after being incubated about 2.0～2.5 hours then 660～690 ℃ of following tempering.After the thermal treatment, grain fineness number 〉=8.0 grade.Total cross section martensitic transformation rate reaches more than 90%.
Below narrate the reason that elements such as C, Si, Mn, P, S, Ni, Cr, Mo, Al, Nb, V, Ca limit among the present invention:
C is a strengthening element main in the steel, and it can significantly improve the intensity and the hardening capacity of steel, and the intensity of stipulating among the API for strength of joint is reached is limited to 0.25% under it.But along with the increase of C content, its low-temperature impact work will reduce, and tough-crisp transition temperature will improve, and simultaneously, consider also and will weld with body, and its C content should not surpass 0.35%.
Mn is useful alloying element in low-temperature steel, and it can not only improve the intensity of steel, reduces the ductile-brittle transition temperature of steel, improves the hardening capacity of steel, can also fall doctor negative deleterious effect with the sulphur bound energy.But Mn too high levels, crystal grain are thick easily, have also increased temper brittleness, and therefore, its content is 0.5～1.0%.
P, S are the harmful elements in the low-temperature steel, and content is low more good more, consider the stability of production cost and batch process, P≤0.015, S≤0.008.
Add Cr and be in order to improve hardening capacity and to improve the intensity of steel, content makes joint of the present invention can obtain good hardening capacity, intensity and toughness with steel 0.80～1.50%.Cr content is too high, can reduce the toughness of steel.
Adding Mo is in order to improve the hardening capacity of steel, to reduce the temper brittleness that other elements cause.Because wall thickness about 20～30mm in joint screw thread place reaches more than 90% for making its total cross section martensitic transformation rate, and general high tempering is favourable with the toughness of steel to drilling rod, therefore adds a certain amount of Mo and is necessary.For obtaining best net effect (cost, performance), its content can float in 0.15～1.0% scope.
Ni is one of most important alloying element in the low-temperature steel, adds in the steel to form αGu Rongti with matrix, can significantly improve ferritic toughness, thereby improves the low-temperature flexibility of ferritic steel for low temperature service.Along with the increase of nickel content in the steel, low-temperature flexibility improves, and ductile-brittle transition temperature reduces.In addition, Ni can also improve the hardening capacity of steel, reduces distortion and the tearing tendency of steel when quenching.But the nickel too high levels increases cost on the one hand, also can damage the processing performances such as weldability of steel on the other hand.Therefore, in the steel of the present invention, the limited range of Ni is 0.75～1.50%.
Al except that deoxidation, can also combine with nitrogen in steel, reduces the deleterious effect of nitrogen in matrix, improves the toughness and the timeliness adaptability to changes of steel, and formed aluminium nitride can hinder growing up of ferrite crystal grain, makes grain refining, further reduces the ductile-brittle transition temperature of steel.But the aluminium too high levels, the inclusion in the steel will exceed standard easily, and this low-temperature flexibility to steel is unfavorable.Therefore, the limited range of Al is≤0.03%.
V can suppress that crystal boundary moves and grain growth in the steel, makes grain refining.No matter in addition, add a certain amount of V in the steel, be annealing, normalizing or quality adjustment condition, can improve the intensity of steel, can also improve the plasticity and toughness of steel.But the V too high levels, for reaching same intensity, tempering temperature can significantly improve, thereby is unfavorable for joint and joint postweld heat treatment technology coupling, finally reduces the low-temperature performance of weld seam, the content of V≤0.01% in the steel of the present invention.
Ti is the strong carbide forming element, and it is thick effectively to suppress austenite crystal, improves the intensity and the low-temperature flexibility of steel, but because Ti and nitrogen, oxygen combining power are very strong, addition is too much, then generates the hard crisp phase of TIN easily, reduces the low-temperature performance of steel.Therefore, content≤0.01% of V in the steel of the present invention.
The avidity of Re and oxygen, sulphur, phosphorus, nitrogen, hydrogen is very strong, has the degassing, desulfurization phosphorus and eliminates the effect of other detrimental impurity, and improve the form and the distribution of inclusion, and its content is controlled at≤0.03 level in the steel of the present invention.
Embodiment
Below by embodiment the present invention is specifically described.Be necessary to be pointed out that at this; following examples only are used for that the invention will be further described; can not be interpreted as limiting the scope of the invention, some nonessential improvement and adjustment that the professional and technical personnel in this field content according to the present invention is made still belong to protection scope of the present invention.
Embodiment 1
(for example, get C 0.26, Si 0.28, and Mn 0.55, and P 0.008, and S 0.004, and Cr 0.85, and Ni 1.27, and Mo 0.65, and Al 0.02, V0.08) by the chemical ingredients of the present invention design.After requirement is smelted, continuous casting and rolling becomes round steel, this hot rolled circular steel is forged into the NC40 male joint of regulation among the API SPEC 7, its external diameter is 139.7mm, internal diameter is 61.9mm, put into pit furnace then and be heated to 920 ℃ and be incubated 1 hour, quench and fully after the cooling, tempering in the pit furnace of packing into, tempering temperature is set at 680 ℃, is incubated to come out of the stove after 2 hours.In the sampling of screw thread place, carry out tension test, serial low temperature impact test and metallurgical analysis test after the thermal treatment.The result shows that joint performance is as follows: yield strength is 905MPa, and-60 ℃, Charpy-V impact power (vertically, full-scale) mean value is 110J, fracture fiber rate average out to 100%, and ductile-brittle transition temperature is-85 ℃, total cross section martensitic transformation rate is greater than 90%.
Embodiment 2
By the chemical ingredients of the present invention design (for example, get C 0.30, Si 0.23, and Mn 0.79, and P 0.006, S0.003, Cr 1.05, Ni 0.99, Mo 0.20, Ti 0.02, Re 0.02).After requirement is smelted, continuous casting and rolling becomes round steel, this hot rolled circular steel is forged into the NC50 female joint of regulation among the API SPEC 7, its external diameter is 168.3mm, internal diameter is 82.5mm, put into pit furnace then and be heated to 940 ℃ and be incubated 1.5 hours, quench and fully after the cooling, tempering in the pit furnace of packing into, tempering temperature is set at 690 ℃, is incubated to come out of the stove after 2.5 hours.In the sampling of screw thread place, carry out hardness, serial low temperature impact test and metallurgical analysis test after the thermal treatment.The result shows that joint performance is as follows: Brinell hardness mean value is 315HB, and-60 ℃, Charpy-V impact power (vertically, full-scale) mean value is 100J, fracture fiber rate average out to 100%, and ductile-brittle transition temperature is-80 ℃, total cross section martensitic transformation rate is greater than 90%.
Claims (5)
1. a drill pipe sub steel that is applicable to low temperature environment is characterized in that, described drill pipe sub is grouped into the one-tenth of steel by following weight per-cent: C 0.25-0.35%, Mn 0.50-1.00%, P≤0.015%, S≤0.008%, Mo 0.15-1.00%, Ni 0.75-1.50%, Cr 0.80-1.50%, in addition, also contain Si≤0.30%, Al≤0.03%, V≤0.10%, Ti≤0.03%, two or more in RE≤0.03%, surplus is Fe and the trace elements that can not remove.
2. drill pipe sub steel according to claim 1, it is characterized in that described drill pipe sub is grouped into the one-tenth of steel by following weight per-cent: C 0.25-0.28%, Mn 0.50-0.70%, P 0.008%, S 0.004%, Mo 0.6-0.8%, Ni 1.20-1.50%, Cr 0.80-1.00%, Si 0.25-0.30%, Al 0.02%, V 0.04-0.10%; Surplus is Fe and the trace elements that can not remove.
3. drill pipe sub steel according to claim 1, it is characterized in that described drill pipe sub is grouped into the one-tenth of steel by following weight per-cent: C 0.28-0.34%, Mn 0.75-1.0%, P≤0.015%, S≤0.005%, Mo 0.10-0.30%, Ni 0.90-1.10%, Cr 0.95-1.40%, Si 0.23%, and Ti 0.02%, and Re 0.02%; Surplus is Fe and the trace elements that can not remove.
4. drill pipe sub steel according to claim 1 is characterized in that, described low temperature environment is meant-20 ℃ to-60 ℃.
5. the drill pipe sub that the is applicable to low temperature environment Heat Treatment Of Steel technology of claim 1, it is characterized in that, comprise the steps: various compositions in stove internal heating to 900～960 ℃, be incubated after 1.0～1.5 hours, put into quenchant and fully cooling, then 660～690 ℃ of following tempering, come out of the stove after being incubated about 2.0～2.5 hours;
Described various composition is C 0.25-0.35% as expressed in weight percent, Mn 0.50-1.00%, P≤0.015%, S≤0.008%, Mo 0.15-1.00%, Ni 0.75-1.50%, Cr 0.80-1.50%, in addition, also contain in Si≤0.30%, Al≤0.03%, V≤0.10%, Ti≤0.03%, RE≤0.03% two or more, surplus is Fe and the trace elements that can not remove.
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| CN2011100545885A CN102140610A (en) | 2011-03-08 | 2011-03-08 | Steel suitable for drill rod joint in low-temperature environment and heat treatment process of steel |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424935A (en) * | 2011-12-19 | 2012-04-25 | 张家港市鼎力铸钢有限公司 | Low-alloy and low-temperature cast steel containing Cr and Ni |
| CN102965586A (en) * | 2012-12-10 | 2013-03-13 | 张家港市鼎力铸钢有限公司 | Low alloy steel |
| CN103233113A (en) * | 2013-04-28 | 2013-08-07 | 江苏曙光石油钻采设备有限公司 | Heat treatment process of welded type weighted drill rod joint |
| CN103789649A (en) * | 2014-02-17 | 2014-05-14 | 上海海隆石油管材研究所 | Carbon-dioxide-corrosion-resistant oil drill pipe and production method thereof |
| CN104004965A (en) * | 2014-06-05 | 2014-08-27 | 通裕重工股份有限公司 | Steel for wind power main shaft and heat treatment method thereof |
| JP2014181394A (en) * | 2013-03-21 | 2014-09-29 | Nippon Chuzo Co Ltd | High strength cast steel material for structure |
| CN104313449A (en) * | 2014-09-29 | 2015-01-28 | 中原特钢股份有限公司 | Production method of low-temperature high-strength high-toughness steel for lifting rings |
| CN104894341A (en) * | 2015-05-26 | 2015-09-09 | 成都高普石油工程技术有限公司 | Processing method for petroleum drilling rod joint |
| CN104988407A (en) * | 2015-06-23 | 2015-10-21 | 中国石油集团渤海石油装备制造有限公司 | Petroleum drilling sulphur-resisting drill pipe and preparation method thereof |
| CN105154627A (en) * | 2015-06-29 | 2015-12-16 | 中原特钢股份有限公司 | Production method for drilling tool materials used in low-temperature environment |
| CN109338064A (en) * | 2018-11-21 | 2019-02-15 | 东北大学无锡研究院 | A kind of heavy-duty gear steel alloy 1.6582 forges the preparation method of circle |
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
| CN115896607A (en) * | 2021-09-24 | 2023-04-04 | 宝山钢铁股份有限公司 | High-hardenability wind power bolt steel, bar and manufacturing method thereof |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102424935A (en) * | 2011-12-19 | 2012-04-25 | 张家港市鼎力铸钢有限公司 | Low-alloy and low-temperature cast steel containing Cr and Ni |
| CN102965586A (en) * | 2012-12-10 | 2013-03-13 | 张家港市鼎力铸钢有限公司 | Low alloy steel |
| JP2014181394A (en) * | 2013-03-21 | 2014-09-29 | Nippon Chuzo Co Ltd | High strength cast steel material for structure |
| CN103233113A (en) * | 2013-04-28 | 2013-08-07 | 江苏曙光石油钻采设备有限公司 | Heat treatment process of welded type weighted drill rod joint |
| CN103789649B (en) * | 2014-02-17 | 2016-08-17 | 上海海隆石油管材研究所 | The oil drill rocker of a kind of carbon dioxide corrosion-resistant and production method thereof |
| CN103789649A (en) * | 2014-02-17 | 2014-05-14 | 上海海隆石油管材研究所 | Carbon-dioxide-corrosion-resistant oil drill pipe and production method thereof |
| CN104004965A (en) * | 2014-06-05 | 2014-08-27 | 通裕重工股份有限公司 | Steel for wind power main shaft and heat treatment method thereof |
| CN104313449A (en) * | 2014-09-29 | 2015-01-28 | 中原特钢股份有限公司 | Production method of low-temperature high-strength high-toughness steel for lifting rings |
| CN104894341A (en) * | 2015-05-26 | 2015-09-09 | 成都高普石油工程技术有限公司 | Processing method for petroleum drilling rod joint |
| CN104988407A (en) * | 2015-06-23 | 2015-10-21 | 中国石油集团渤海石油装备制造有限公司 | Petroleum drilling sulphur-resisting drill pipe and preparation method thereof |
| CN105154627A (en) * | 2015-06-29 | 2015-12-16 | 中原特钢股份有限公司 | Production method for drilling tool materials used in low-temperature environment |
| CN112041468A (en) * | 2018-02-23 | 2020-12-04 | 瓦卢莱克德国有限公司 | High tensile strength and high toughness steel |
| CN109338064A (en) * | 2018-11-21 | 2019-02-15 | 东北大学无锡研究院 | A kind of heavy-duty gear steel alloy 1.6582 forges the preparation method of circle |
| CN110157980A (en) * | 2019-05-09 | 2019-08-23 | 南京钢铁股份有限公司 | A kind of tool joint steel with superior low temperature impact property |
| CN112048669A (en) * | 2020-08-28 | 2020-12-08 | 南京钢铁股份有限公司 | High-strength and high-toughness steel for drill pipe joint and preparation method thereof |
| CN115896607A (en) * | 2021-09-24 | 2023-04-04 | 宝山钢铁股份有限公司 | High-hardenability wind power bolt steel, bar and manufacturing method thereof |
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Application publication date: 20110803 |