CN101353765A - Steel for CT80 grade coiled tubing, and manufacturing method and use thereof - Google Patents
Steel for CT80 grade coiled tubing, and manufacturing method and use thereof Download PDFInfo
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Abstract
The invention provides a steel used for a CT80 coiled tubing, the chemical compositions of which by weight percentage are as follows: 0.04 percent to 0.25 percent of C, 0.10 percent to 0.60 percent of Si, 0.50 percent to 2.0 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.050 percent of S, 0.30 percent to 1.50 percent of Cr, 0.02 percent to 0.13 percent of Nb, 0.01 percent to 0.10 percent of Ti, 0.01 percent to 0.10 percent of V, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni and 0.01 percent to 0.05 percent of Al, and the rest are Fe and other unavoidable impurities. The invention also provides a manufacturing method and the application of the steel. The steel used for the CT80 coiled tubing of the invention has yield strength up to 80Kpsi (kilopond per square inch) and better plasticity. The manufacturing method of the invention is simple and easy to be implemented.
Description
Technical field
The present invention relates to the manufacture method and the application of a kind of CT80 cascade steel for continuous oil pipe, CT80 cascade steel for continuous oil pipe.
Background technology
For conventional thread connection oil pipe, it is called coiled tubing, serpentine tube or coil pipe again to coiled tubing (Coiled Tubing is called for short CT).Be a kind of being wrapped on the cylinder, the long oil pipe of one whole no thread connection that can be lowered to continuously or trip out from oil well.Coiled tubing mainly contains carbon steel, quenched and tempered steel and exotic material etc. with material, exotic material wherein, and for example titanium alloy has light weight and intensity advantages of higher, but price is expensive, is 6 times of common steel coiled tubing.
Since the 1st continuous string coiled tubing unit came out and begins to be used for petroleum industry in the world in 1962, through 40 years of development, the coiled tubing operation now become world's oil and gas industry technical study and use in a focus.
Abroad, the coiled tubing technology mainly is the passage as transmitting fluid, is used for well-flushing, matrix acidifying and nitrogen lifting substantially, and calendar year 2001 accounts for 77% of coiled tubing service income.The coiled tubing technology has expanded to fields such as drilling well, well workover, well logging, perforation and well stimulation at present.The developing direction of world today's well workover technology has been represented in the coiled tubing well workover, and will be as a kind of routine, operation technique is worldwide popularized efficiently.The coiled tubing maximum drilling depth has surpassed 6900m at present, and its external diameter develops into 168.27mm by initial 33.4mm, and along with the development of coiled tubing technology, the application in the drilling well field will further enlarge.We can say that World Oil Industry is experiencing the technological revolution of one-time continuous oil pipe.
China introduces and utilizes the coiled tubing technology to start from the seventies.1977, China introduced the product of the 1st Bowen Oil Tools (Bonn Worktools Inc.).
Along with coiled tubing continuous advancement in technology and development, the use of coiled tubing has expanded to each field of petroleum industry, especially in recent years in the application in drilling well field and oil transportation field, the expansion of range of application is had higher requirement to coiled tubing, is current vital task so develop the coiled tubing of high-level practicality.
It is ripe that coiled tubing development abroad has been tending towards, and the coiled tubing of China is started late, and do not have production and the manufacturing firm of coiled tubing with steel at present, is restricted at many technical elements.Several in the world big coiled tubing principal manufacturer all concentrate on the U.S., they are QualityTubing company (high-quality oil pipe companies), Precision Technology company (accurate Manifold technology company), Southwestern Pipe company (southwestern pipe company).Continuous introduction along with China advanced coiled tubing Operation Van, and extensively carry out and external exchange of technology, the correlation technique of coiled tubing will obtain development rapidly in China, and its application also develops into fields such as drilling well, gathering line by current conventional well workover, logging operation.But domestic employed coiled tubing mainly depends on import, so it is extremely urgent with steel to develop domestic coiled tubing.
Have only the Japan to have delivered the patent of coiled tubing with steel at present, as JP2001303206, this patent has been described a kind of have antifatigue, anti-hydrogen induced cracking and carbon dioxide corrosion-resistant, the stainless manufacturing technology of coiled tubing that can be used for carrying oil gas.This patent adopts stainless composition design, contains the Cr (9～15%) and Ni (0.7～8%) alloying element of higher proportion, in addition, also contains rare metal Zr (0.005～0.10%), and cost is higher.
Other patent about coiled tubing mainly is relevant with implement or relevant with welding property, no comparability.
Main purpose of the present invention is the demand according to current Development of Coiled Tubing Technology trend and petroleum industry, and a kind of CT80 cascade steel for continuous oil pipe is provided, and is used to satisfy oil field operation field demands such as drilling well, well logging, completion.
In addition, the present invention also provides the manufacture method of above-mentioned steel.
Summary of the invention
The object of the present invention is achieved like this:
CT80 cascade steel for continuous oil pipe provided by the invention, its chemical ingredients that has (Wt%) is C:0.04～0.25, Si:0.10～0.60, Mn:0.50～2.0, P≤0.015, S≤0.050, Cr:0.30～1.50, Nb:0.02～0.13, Ti:0.01～0.10, V:0.01～0.10, Mo :≤0.30, Cu :≤0.30, Ni≤0.30, Al:0.01～0.05, surplus are Fe and inevitably are mingled with.
In order to obtain having 80Kpsi (kip/square inch) the cascade steel for continuous oil pipe of high strength and good plasticity, the inventor has carried out relevant experimental study, the composition design philosophy is that low C, high Cr guarantee that this steel grade has good resistance to corrosion, and by adding micro-Nb and being equipped with other a small amount of alloying element crystal grain thinning, improve intensity, in conjunction with cooling controlling and rolling controlling process, obtain ferrite+perlite+a small amount of bainite structure, to guarantee when obtaining good plasticity, not losing intensity.
Composition design considerations of the present invention is as follows:
Carbon C: the most basic strengthening element, but too high C is unfavorable to ductility, toughness and the welding property of steel, influences the strengthening effect degree of Nb simultaneously, the intensity of the too low reduction steel of C.So C is controlled at 0.04%～0.25%.
Silicon Si: mainly being the intensity that improves steel with the solution strengthening form, also be simultaneously the deoxidant element in the steel, but too high levels can worsen the welding property of steel, therefore is controlled at 0.10～0.60%.
Manganese Mn:, be that compensation reduces the main and most economical strengthening element that causes loss of strength in the steel because of C content by the intensity of solution strengthening raising steel.Mn still enlarges the element of γ phase region, can reduce the γ → α transformation temperature of steel, helps to obtain tiny phase-change product, can improve the toughness of steel.This steel grade Mn content is 0.50%～2.00%.
Niobium Nb: be one of topmost element in the modern micro-alloyed steel, fairly obvious to the effect of grain refining.Separate out the austenitic answer of obstruction deformation, recrystallize by NbC strain inducing in the course of hot rolling, when making the rolling deformation austenite structure in non-recrystallization zone in phase transformation, controlled rolling and controlled chilling change tiny phase-change product into, so that steel has high strength and high tenacity.Too low strengthening effect is not obvious, and in addition owing to be subjected to the too high Nb of restriction of C content also not bring into play effect, so Nb content is controlled at 0.02%～0.13%.
Chromium Cr: improve the important element of the hardening capacity of steel, effectively improve the intensity of steel, and Cr content can effectively improve the corrosion resistance nature of steel 0.20% when above; But too high chromium and manganese add in the steel simultaneously, can cause low melting point Cr-Mn composite oxides to form, and form surface crack in hot procedure, simultaneously can the severe exacerbation welding property.Cr content should be limited to 0.30%～1.50% among the present invention.
Titanium Ti: be a kind of intensive carbonitride forming element, the not molten carbonitride of Ti can stop growing up of austenite crystal when steel heats, TiN that separates out when the roughing of high temperature austenite district and TiC can effectively suppress austenite crystal and grow up, and improve the solid solubility of Nb in austenite simultaneously.In welding process, TiN in the steel and TiC particle can significantly stop the heat affected zone grain growth in addition, thereby the welding property of improving steel plate has obvious effect to the impelling strength of improving welded heat affecting zone simultaneously.Ti content is controlled at 0.01%～0.10% among the present invention.
Vanadium V:V is by forming VN or the fine precipitation particles of V (CN) with C and N, and the reinforcement of steel is contributed.Simultaneously, V helps improving the stability of modified back hardness.But too high as content, then cost increases significantly.So its content is controlled at 0.01%～0.10%.
Molybdenum Mo: improve the element of hardening capacity, effect is only second to Mn, and Mo can also play and overcome temper brittleness, improves the effect of heat treatment performance, fatigue property.In high-strength low-alloy steel, yield strength improves with the increase of Mo content, and therefore too high Mo diminishes plasticity.Mo content is smaller or equal to 0.30% among the present invention.
Sulphur, phosphorus (S, P): be unavoidable impurities element in the steel, it is low more good more to wish.By super low sulfur (less than 30ppm) and Ca processing sulfide is carried out inclusion morphology control, can guarantee that steel plate has good impelling strength.
Copper, nickel (Cu, Ni): can improve the intensity of steel by the solution strengthening effect, Cu also can improve the solidity to corrosion of steel simultaneously, and the adding of Ni mainly is to improve the red brittleness that Cu easily causes in steel, and useful to toughness.Cu, Ni content range are≤0.30% among the present invention.
Aluminium Al:Al is the element that adds for deoxidation in the steel, adds an amount of Al and helps crystal grain thinning, improves the toughness and tenacity of steel.
Calcium Ca: handle the form that to control sulfide by Ca, improve the anisotropy of steel plate, improve low-temperature flexibility.
The present invention also provides the manufacture method of CT80 cascade steel for continuous oil pipe, and comprise smelting, casting, slab reheat, controlled rolling, cool off and batch, wherein, slab heating temperature: 1150～1250 ℃; Treat warm temperature range: 1050～950 ℃; Finishing temperature span of control: 780～920 ℃; Coiling temperature span of control: 400～700 ℃; Speed of cooling: 2～20 ℃/s.
According to the present invention, based on material reinforcement theories such as grain refining, phase transformation strengthening, precipitation strength and dislocations strengthenings, adopted the composition of low C, high Cr, low S and Nb, V, Ti alloying to design with steel to having ferrite+perlite+a small amount of bainite CT80 coiled tubing.Hot rolling technology has adopted the hot mechanical treatment technology of controlled rolling and controlled cooling, carries out the structure property control of the finished product, the tissue that obtains to have higher-strength and good plasticity by reasonable component and technology.
The present invention also provides the application of CT80 cascade steel for continuous oil pipe on coiled tubing.Coiled tubing of the present invention all can satisfy its application on coiled tubing with tensile property, elongation and the hardness value of steel.
The present invention has following beneficial effect:
Characteristics of the present invention: (1) the present invention adopts Nb microalloying principle of design, improves intensity by the solution strengthening of Nb and the precipitation strength of Nb (C/N) change thing; (2) steel that obtains according to the present invention, it is organized as ferrite+perlite+a small amount of bainite, and being engaged in of tough phase kept good plasticity when improving intensity; (3) the present invention adopts the low-sulfur design, has good impelling strength to guarantee steel; (4) Nb of containing coiled tubing of the present invention has lower carbon equivalent with steel, has good welding property.
The coiled tubing that goes out produced according to the invention can reach following requirement with rigidity:
(1) tensile property: R
T 0.5〉=552MPa, R
m〉=621MPa
(2) unit elongation: A
50.8% 〉=15%
(3) hardness value: HRC≤22
Embodiment
Be described more specifically the present invention below.
Embodiment 1
The present embodiment coiled tubing is C:0.04, Mn:1.92, Si:0.25, S:0.0016, P:0.009, Nb:0.128, Ti:0.016, Cr:0.62, Ca:0.0023, Al with steel chemical composition (Wt%)
t: 0.035, V:0.06, N:0.006, O:0.002, H:0.0002, surplus is Fe and inevitably is mingled with.Ceq is 0.496.
After smelting, casting, slab reheat, controlled rolling, cooling off and batch series of processes, obtain the coiled tubing steel.Wherein main processing parameter following (1) slab heating temperature: 1200 ℃; (2) treat warm temperature range: 1050～950 ℃; (3) finishing temperature: 850 ℃; (4) coiling temperature control: 580 ℃; (5) speed of cooling scope: 12～17 ℃/s.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:618,621; R
mMPa:750,762; A
50.8%:21.5,20.5; HRC:19.8,21.0.
Embodiment 2
The present embodiment coiled tubing is C:0.08, Mn:1.40, Si:0.25, S:0.0030, P:0.009, Nb:0.07, Ti:0.01, Cu:0.25, Ni:0.15, Cr:0.31, Ca:0.0015, Al with steel chemical composition (Wt%)
t: 0.02, V:0.09, N:0.004, O:0.002, H:0.0003, surplus is Fe and inevitably is mingled with.Ceq is 0.420.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:572,560; R
mMPa:650,630; A
50.8%:28.0,29.4; HRC:12.4,13.0.
Embodiment 3
The present embodiment coiled tubing is C:0.23, Mn:0.70, Si:0.30, S:0.0020, P:0.012, Nb:0.06, Ti:0.02, Cr:0.5, Ca:0.003, Al with steel chemical composition (Wt%)
t: 0.04, V:0.07, N:0.004, O:0.003, H:0.0003, surplus is Fe and inevitably is mingled with.Ceq is 0.461.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:573,580; R
mMPa:662,668; A
50.8%:26.0,26.5; HRC:15.6,16.0.
Embodiment 4
The present embodiment coiled tubing is C:0.08, Mn:1.23, Si:0.53, S:0.0034, P:0.010, Nb:0.05, Ti:0.015, Ni:0.25, Cr:1.08, Ca:0.0023, Al with steel chemical composition (Wt%)
t: 0.03, V:0.02, N:0.004, O:0.002, H:0.0002, surplus is Fe and inevitably is mingled with.Ceq is 0.522.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:650,654; R
mMPa:798,803; A
50.8%:19.0,18.0; HRC:21.8,21.2.
Embodiment 5
The present embodiment coiled tubing is C:0.09, Mn:0.84, Si:0.16, S:0.0020, P:0.008, Nb:0.029, Ti:0.015, Cu:0.12, Ni:0.08, Mo:0.15, Cr:0.55, Ca:0.0018, Al with steel chemical composition (Wt%)
t: 0.026, V:0.029, N:0.004, surplus is Fe and inevitably is mingled with.Ceq is 0.389.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:554,553; R
mMPa:645,644; A
50.8%:29.5,30.0; HRC:11.0,11.8.
Embodiment 6
The present embodiment coiled tubing is C:0.18, Mn:0.6, Si:0.25, S:0.0020, P:0.012, Nb:0.022, Ti:0.015, Cr:0.95, Ca:0.0023, Al with steel chemical composition (Wt%)
t: 0.03, V:0.08, N:0.004, O:0.003, H:0.0003, surplus is Fe and inevitably is mingled with.Ceq is 0.486.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:580,573; R
mMPa:719,723; A
50.8%:24.3,26.0; HRC:16.0,16.3.
Embodiment 7
The present embodiment coiled tubing is C:0.05, Mn:0.55, Si:0.25, S:0.0019, P:0.012, Nb:0.022, Ti:0.015, Cr:1.46, Ca:0.0023, Al with steel chemical composition (Wt%)
t: 0.03, V:0.08, N:0.004, O:0.003, H:0.0003, surplus is Fe and inevitably is mingled with.Ceq is 0.450.
Coiled tubing uses the manufacture method of steel with embodiment 1.
After testing, the present embodiment coiled tubing is as follows with the mechanical property result of steel: R
T0.5MPa:572,579; R
mMPa:720,719; A
50.8%:25.0,25.2; HRC:16.1,16.5.
As can be seen, composition and technology all can reach R designed according to this invention
T0.5〉=552MPa, R
m〉=621MPa; A
50.8% 〉=15%; The requirement of HRC≤22 has good comprehensive mechanical properties, and carbon equivalent is lower, helps welding.Composition of the present invention in addition is simple, and the process window broad is implemented at the scene than being easier to.
Claims (3)
1, a kind of CT80 cascade steel for continuous oil pipe, it is characterized in that, its chemical ingredients (Wt%) is C:0.04～0.25, Si:0.10～0.60, Mn:0.50～2.0, P≤0.015, S≤0.050, Cr:0.30～1.50, Nb:0.02～0.13, Ti:0.01～0.10, V:0.01～0.10, Mo :≤0.30, Cu :≤0.30, Ni≤0.30, Al:0.01～0.05, surplus are Fe and inevitably are mingled with.
2, the manufacture method of CT80 cascade steel for continuous oil pipe as claimed in claim 1 comprises smelting, casting, slab reheat, controlled rolling, cools off and batches, and it is characterized in that:
Slab heating temperature: 1150～1250 ℃;
Treat warm temperature range: 1050～950 ℃;
Finishing temperature span of control: 780～920 ℃;
Coiling temperature span of control: 400～700 ℃;
Speed of cooling: 2～20 ℃/s.
3, the application of CT80 cascade steel for continuous oil pipe as claimed in claim 1 on coiled tubing.
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| CNA2007100939683A CN101353765A (en) | 2007-07-23 | 2007-07-23 | Steel for CT80 grade coiled tubing, and manufacturing method and use thereof |
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| CNA2007100939683A CN101353765A (en) | 2007-07-23 | 2007-07-23 | Steel for CT80 grade coiled tubing, and manufacturing method and use thereof |
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| CN115433870A (en) * | 2021-06-02 | 2022-12-06 | 宝山钢铁股份有限公司 | Low-cost quenched and tempered steel for continuous oil pipe, hot-rolled steel strip, steel pipe and manufacturing method thereof |
| CN115433870B (en) * | 2021-06-02 | 2023-08-11 | 宝山钢铁股份有限公司 | Low-cost quenched and tempered steel for continuous oil pipe, hot rolled steel strip, steel pipe and manufacturing method thereof |
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