CN101418421A - High intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same - Google Patents
High intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same Download PDFInfo
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Abstract
The invention discloses a high-strength oil casing for resisting hydrogen sulfide corrosion and a method for manufacturing the same. The oil casing comprises the following composition in weight percentage: 0.20 to 0.25 percent of C, less than or equal to 0.25 percent of Si, 0.80 to 1.50 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.60 to 1.4 percent of Mo, 0.90 to 1.30 percent of Cr, 0.0005 to 0.010 percent of B, 0.01 to 0.10 percent of Ti, 0.03 to 0.10 percent of Nb, less than or equal to 0.020 percent of As, less than or equal to 0.020 percent of Sn, less than or equal to 0.30 percent of Cu, less than or equal to 0.30 percent of Ni, less than or equal to 0.02 percent of Al, less than or equal to 0.0002 percent of (H), less than or equal to 0.008 percent of (N), and the balance being iron. The method comprises the following steps: molten iron and scrap steel undergoes smelting, refining, vacuum degassing and curved continuous casting to prepare a pipe blank; the pipe blank undergoes hot-rolling to prepare a light pipe; and the light pipe undergoes heat treatment and pipe processing to obtain the finished product. The high-strength oil casing has excellent physical and chemical properties, service performance, and hydrogen sulfide stress corrosion resistance.
Description
Technical field
The present invention relates to a kind of oil well pipe and manufacture method thereof of belonging to, particularly a kind of yield strength is greater than 758MPa (110ksi) high intensity oil casing tube for resisting sulfurated hydrogen corrosion and manufacture method thereof.
Background technology
Carbon steel or low alloy steel is exposed to and contains H
2In the surrounding medium of S, invade in the steel because of the hydrogen that corrosion produces, under stress sulfide-stress cracking (SSCC) can take place, the subject matter that the sulfur-bearing oil-gas field development faces is exactly H
2The S etching problem.In China, the sulfur-bearing oil-gas field mainly is distributed in Sichuan, North China and Xinjiang, and is wherein, especially the most serious with area, east, river, because hydrogen induced cracking (HIC) and sulfide-stress cracking meeting cause tubing and casing (oil pipe and sleeve pipe) early failure even cause catastrophic failure to take place, so the anti-H of Development and Production
2The tubing and casing of S becomes the important topic of research naturally.
Steel is at H
2Corrosion failure phenomenon in the S medium just was found before more than 40 year, and the various countries scholar has carried out number of research projects for this reason.Generally believed H
2S not only has very strong corrodibility to steel, and H
2Still a kind of very strong hydrogen medium, H of oozing of S itself
2The S corrosion failure is caused by hydrogen.Contain H
2S sour oil gas field tubing and casing corrosion failure type mainly contains three kinds of forms: uniform corrosion or (with) spot corrosion, sulfide stress cracking (SSC) (SSC), hydrogen bring out crackle (HIC) and hydrogen blistering (HB).
Cause steel matrix rimose process also not have consistent understanding so far.But generally believe that the content of hydrogen generally is very little in the steel, have test to show to have only ppm usually.Therefore, the position of germinating crackle must be the energy that enough enriched hydrogen are arranged.All exist defective in the oil bushing steel that uses on the actual engineering, the bound energy of these defectives and hydrogen is strong, hydrogen can be caught to stick, and makes it to be difficult to diffusion, just becomes the enrichment region of hydrogen, usually these defectives is called trap.The H of molecular state
2S generates atomic hydrogen in a large number and gathers to these traps, in a single day the hydrogen that is enriched in trap be combined into hydrogen molecule, the hydrogen pressure of accumulation is very high, cause stress concentration, so impel the steel embrittlement, regional area generation viscous deformation, and the germinating crackle cause at last the cracking, this type of fracture belongs to sulfide-stress cracking (SSCC).SSCC belongs to low-stress and breaks, and the stress value when SSCC takes place is usually far below the tensile strength of steel, the fracture apperance of its mechanism characteristic that enbrittles.The brilliant destruction in transcrystalline and edge all can be observed, and general high-strength steel mostly is along crystalline substance and breaks.
Influencing tubing and casing anti-H 2 S stress corrosion material factor mainly contains: the chemical ingredients of the hardness of material, the microstructure of material and material.
The hardness of steel pipe (intensity) is the significant variable of steel pipe H 2 S stress corrosion (SSC) field failure, is the important indicator of control steel pipe generation sulphide stress corrosion.Steel pipe hardness is high more, and the required time of ftractureing is short more, illustrates that SSC susceptibility is high more.Finding the influence of intensity by a large amount of test, when Rt≤700MPa, increase that anti-H 2 S stress corrosion threshold value σ C increases, still, as Rt with Rt to anti-H 2 S stress corrosion〉anti-H 2 S stress corrosion threshold value σ C sharply descends during 700MPa.Practical manifestation is: when YIELD STRENGTH is lower than the stress corrosion threshold value, stress corrosion does not take place; When yield strength was higher than the stress corrosion threshold value, stress corrosion crack can take place in material under the condition far below material yield intensity.Therefore, in NACE MRO175 standard, the anti-SSC material of all of regulation all has the hardness requirement.The microstructure of steel pipe directly affects the anti-SSC performance of steel.To carbon steel and low alloy steel, when its intensity was similar, ascending putting in order was: equally distributed globular carbide in the ferrite, quenching+tempered structure (tempered sorbite), normalizing+tempered structure, normalized structure, bainite and martensitic stucture fully to different microstructures to SSC susceptibility.The equally distributed tiny globular carbide tissue that the back high tempering that quenches obtains is the optimal tissue of anti-SSC, and bainite and martensitic stucture are the most responsive to SSC, and other will change with the intensity of steel SSC susceptibility between the two tissue.The chemical ingredients of steel it is generally acknowledged in carbon steel and low alloy steel that to the influence of its anti-SSC nickel, manganese, sulphur, phosphorus are harmful element.
Summary of the invention
The purpose of this invention is to provide a kind of high intensity oil casing tube for resisting sulfurated hydrogen corrosion and manufacture method thereof, product of the present invention can guarantee to have the anti-H 2 S stress corrosion performance when tubing and casing is at quenching+Annealed Strip in being lower than 758Mpa (110ksi) yield strength scope.
For achieving the above object, the invention provides a kind of high intensity oil casing tube for resisting sulfurated hydrogen corrosion, the pipe composition is counted with weight %: C 0.20～0.25%, Si≤0.25%, Mn 0.80～1.50%, P≤0.015%, S≤0.005%, Mo 0.60～1.4%, and Cr 0.90～1.30%, and B 0.0005～0.010%, Ti 0.01～0.10%, Nb 0.03～0.10%, As≤0.020%, Sn≤0.020%, Cu≤0.30%, Ni≤0.30%, Al≤0.02%, (H)≤0.0002%, (N)≤0.008%, surplus is an iron, and the inevitable impurity of some courses of processing, and the anti-H 2 S stress threshold value 〉=85%SMYS of pipe.
The manufacture method of high intensity oil casing tube for resisting sulfurated hydrogen corrosion of the present invention, comprise at first raw material molten iron and steel scrap made steel and make circular pipe blank, also can adopt sponge iron and steel scrap to make steel and make circular pipe blank, then circular pipe blank hot rolling tube rolling is made light pipe, at last finished product is processed in modified thermal treatment of light pipe and pipe; And the steel-making step is made circular pipe blank after comprising smelting, external refining and vacuum outgas and arc continuous casting.Wherein steel-making is for adopting oxygen coverter or electrosmelting, and employing LF stove and VOD stove carry out refining and vacuum outgas and feed silk, adopt the ACC continuous casting to make circular pipe blank; Tube rolling heats circular pipe blank at first adopting rotary heating furnace, adopts two roller tapered rollers perforation then, tube rolling mill is rolling and 14 sizing mill tube reducings, and through aligning and sawing finishing procedure, after non-destructive test(ing)(NDT) gets light pipe; Modified thermal treatment and pipe are processed as twisting and connect and the homogeneous tube water test by pipe end car silk, box cupling after the modified thermal treatment of light pipe, make the processed oil sleeve pipe at last.Quenching-and-tempering process: 820～940 ℃ of+630～650 ℃ of tempering of quenching.
Can adopt in the actual production
(1) steel-making adopts 40t oxygen converter steelmaking (or 30t electric furnace) to smelt, and LF stove (ladle smelting furnace)+VOD stove (vacuum outgas) refining and hello silk become stand-by circular pipe blank through ACC continuous casting (arc continuous casting steel machine) afterwards then;
(2) tube rolling adopts rotary heating furnace with heating of pipe blank earlier, again with the accurate tube rolling mill of two roller tapered roller perforation+ACCU-ROLL rolling+14 sizing mill tube reducings, and logical begging for rectify blind and sawing finishing procedure, and last non-destructive test(ing)(NDT) becomes weldless steel tube---the telescopic light pipe is used to produce oil.
(3) after modified thermal treatment and the modified thermal treatment of pipe processing light pipe by pipe end car silk, box cupling twist and connect, the homogeneous tube water test, make production tube at last.
Adopt method production of the present invention to have the tubing and casing of making after mentioned component and the technology, have good physicochemical performance, use properties, anti-H 2 S stress corrosion performance, its anti-H 2 S stress corrosion threshold value can reach more than the 85%SMYS (nominal SMYS).
Embodiment
The present invention is based on that following technological thought draws: for metallic substance itself, influence its corrosion resistant factor aspect down several, (1), the chemical stability of metal itself, (2) influence of alloying constituent, (3) influence of the purity of metal, (4) influence of metallographic structure, the influence of (5) metallic surface state
For improving the H 2 S stress corrosion performance of tubing and casing of the present invention, the alloying constituent in the steel, the purity of steel, metallographic structure and steel pipe surfaces externally and internally quality particularly important.
Studies show that in a large number the purity of steel is very big to its solidity to corrosion influence, should reduce P in the steel, S content especially, reach threshold value thereby the content of control P, S just can improve the ability of resisting sulfide stress corrosion.Be accompanied by the development of continuous casting technology and furnace outer refining technology, developed novel process, the novel method of a series of raising steel purity, make the purity that increases substantially steel become possibility.
The chemical ingredients and the thermal treatment of steel have determined alloy organizing, and the latter's variation influences corrosion resisting property.In general, normalized structure is better than the erosion resistance of annealed structure.Ferrite-pearlitic structure does not subject to local corrosion significantly than martensite-bainite structure (quenching-tempering).In general, the intensity of steel is high more, and impact toughness is poor more, to H
2S stress corrosion is just responsive more.By to test steel anti-H
2The lag behind performance test of breaking of S corrosion is thought, influences anti-H
2The S factor of performance of breaking that lags behind at first is the metallographic microstructure state, secondly is alloying constituent.Facts have proved that through the microstructure behind the quenching+high tempering fully be that disperse is distributed in the fine carbide on the ferrite matrix, thisly organize anti-H
2The S performance the best of breaking that lags behind.This is that other carbide are separated out on the original austenite crystal because carbide is separated out and originated in self-tempering in the martensite, so it is more even to distribute, this tissue is near thermodynamic equilibrium state, thereby more can improve anti-H
2S corrosion failure performance.Adding element such as Mo in the steel can improve tempering temperature under the prerequisite that keeps certain intensity, thereby antagonism H
2The S corrosion failure is favourable.The anti-H of steel
2The thermal treatment of S corrosion failure performance is so that quenching+high tempering is best fully, and slack quenching+tempering is taken second place, and normalizing or quenching are the poorest.The size antagonism H of grain fineness number
2The lag behind performance of breaking of S is also influential.The thin more antagonism of grain fineness number H
2The S corrosion failure is favourable more.
Below in conjunction with each chemical element sulphide stress corrosion susceptibility is described in detail the process that tubing and casing of the present invention realizes:
C is not only the main strengthening element in the steel, is again simultaneously one of harmful element that reduces toughness and corrosion resistance nature.Carbon is present in the steel with the form of gap solid solution atom or carbide, plays solution strengthening, increases hardening capacity and dispersion-strengthened.And the reduction of carbon content can significantly reduce separating out of chromium carbide, guarantees effective solid solution capacity of chromium, thereby improves the corrosion resistance nature of steel.Therefore carbon content will suitably be controlled, and preferred C content is % meter C 0.20～0.25% by weight;
Si is not only reductor, also can improve the intensity of steel, can reduce toughness but add a large amount of silicon, and silicon is few more, and the anti-H 2 S stress corrosion ability is high more, and preferred Si content is % meter control≤0.40% by weight.
Mn is unfavorable for anti-H
2The S corrosion.Mn combines with S and can form that MnS is mingled with or the Mn segregation, becomes the micro cathode in the steel, promotes the generation of local corrosion,, thus the anti-H of steel reduced
2The S corrosive nature.But except that C, Mn and Si are the most effective and the most cheap alloying elements that improves intensity.Consider that Mn is to H
2Harmful degree of S is littler than Si, thus optional Mn as the alloying element that improves intensity, preferred L n content is % meter controlled contents≤1.50% by weight.
P makes steel produce segregation easily in crystallisation process.Even also be not easy to make being evenly distributed of P, so can produce high P and low P band by thermal treatment.When austenitic state cools off, high P band is because A3 temperature height, at first separate out ferrite, carbon is concentrated to low P band, changes perlite subsequently into, thereby cause perlite to separate with ferritic, just can form banded structure in the operation of rolling, phosphorus can significantly reduce the low-temperature impact toughness of steel, improves the brittle transition temperature of steel, it is cold short that steel pipe is taken place, and preferred P content % is by weight counted controlled contents≤0.015% of should trying one's best.
S is easy to form sulfide inclusion, have a strong impact on mechanical property, especially impelling strength, the content that reduces S can significantly improve the impelling strength of steel, reduce the formation quantity that S content can reduce strip MnS, thereby also improve the anti-H 2 S stress corrosion performance, preferred S content is % meter control≤0.005% by weight.
Cr increases hardening capacity, has both improved the anti-H of steel
2The S corrosive nature also improves the anti-CO2 corrosive nature of steel, adds Cr and not only can avoid the generation of local corrosion in steel, but also can reduce the average corrosion rate of steel greatly.Contain the erosion-resisting reason of Cr steel and be that specimen surface has formed the metal oxide that is rich in Cr, its compactness and stability have better formed good shielding between metal and corrosive medium, and preferred Cr content is % meter Cr 0.90～1.30% by weight;
Mo increases hardening capacity, in the plasticity and the toughness of quenching, the tempering heat treatment state can improve steel effectively.Mo is a ferritic stabilizer, and its anti-corrosion characteristics are to make the alloy that adds Mo increase passivation ability, make it have resistance to reduction dielectric corrosion and anti-Cl
-The anti-spot corrosion of burn into; The acquisition that contains Mo steel corrosion resistance is to be incorporated as precondition simultaneously with enough content of Cr and Mo; Preferred L o content is % meter Mo 0.60～1.4% by weight;
B increases hardening capacity, strengthens grain-boundary strength, and preferred B content is % meter B 0.0005～0.010% by weight;
Ti forms TiC, TiN, crystal grain thinning, intensity, toughness and the sulfur resistance of raising steel; Preferred Ti content is % meter Ti 0.01～0.10% by weight;
Nb forms NbC, NbN, crystal grain thinning, and intensity, toughness and the sulfur resistance of raising steel, preferred Nb content is % meter Nb 0.03～0.10% by weight;
Steel pipe of the present invention sees Table 1 with other identical grade of steel hydrogen sulfide proof steel pipe patent main chemical compositions contrast both at home and abroad.
This high intensity oil casing tube for resisting sulfurated hydrogen corrosion of table 1 patent main chemical compositions contrast (weight %)
Illustrate: the corresponding grade of steel product of 1-Japanese Patent, 2-Baosteel patent, 200510029218.0 corresponding grade of steel products, 3-product of the present invention
The method of making steel pipe of the present invention may further comprise the steps:
1. steel-making continuous casting technical process
Steel-making converter (electric furnace) refining → external refining just → VOD vacuum outgas → arc continuous casting+induction stirring → cooling → check reconditioning
2. tube-rolling technique flow process
Pipe blanking → ring furnace heating → cone-type piercer → AR tube rolling → high-pressure water descaling → slight-stretch reducing footpath → cooling → aligning → crop end, segmentation → online magnetic leakage detection → manual checking, reconditioning → total length drift test.
3. thermal treatment and pipe processing technique flow process
Modified thermal treatment → ultrasonic inspection → total length drift test → pipe end magnetic-particle inspection → car silk → stubborn box cupling → pipe end drift test → hydrostatic test → car silk → upward guard ring → japanning → spray printing sign → packing → warehouse-in.
The manufacture method of steel pipe of the present invention is achieved in that
1. steel-making
Adopt inclusion constituent content low high-quality molten iron or sponge iron and be aided with the high-quality steel scrap, utilization top-blown oxygen converter or electric furnace are smelted, wherein P content should be lower than 0.15% in the molten iron, S content should be less than 0.04%, by in molten steel, adding the lime making foamed slag of high reactivity degree, fully absorb harmful element P, S etc. in the molten steel.Utilize ladle refining+vacuum outgas+Control and Inclusion Removal technology, carry out external refining.C in the steel can control effectively in the external refining control process, the carburetting problem that also will avoid refractory materials to cause after the refining.Adopt when the S in the steel is controlled at LF and dust, add the top slag or use the calcium treatment technology to finish.Oxygen content in steel is too high, and oxide inclusion and macroscopic view are mingled with increase, has a strong impact on the cleanliness factor of Guan Gang, oxide inclusion is one of root of steel generation HIC and SSCC in the steel, the various performances of harm steel, especially after the inclusion diameter is greater than 50, the various performances of severe exacerbation steel.In order to prevent to occur in the steel diameter greater than 50 oxide inclusion, reduce oxide inclusion quantity, generally control oxygen content in steel less than 50ppm.Adopt external refining LF+VOD and WF (Wire Feed feeds silk) can obtain lower oxygen level, in addition, because refractory materials oxygen supply, molten steel should reduce secondary oxidation as far as possible in transportation and casting process, by improving tundish structure and selecting good tundish covering slag that oxygen level is effectively controlled.Hydrogen is the major cause that causes white point and crackle in the steel.Hydrogen richness in the steel is high more, the probability that HIC produces is big more, corrosion rate is high more, the increase of average crack length is remarkable more, utilize boiling dehydrogenation of electric furnace CO oxidation period bubble and external refining (as Argon stirring, VOD refining) degasification process can control the hydrogen richness in the steel well, may command hydrogen number W[H]≤0.0002%, in addition, prevent that other stages of making steel from increasing hydrogen, adopt ladle and tundish preheating baking can effectively reduce the hydrogen of molten steel.In the casting process, in ladle and tundish system, can obviously reduce the hydrogen of molten steel to the use repeatedly of protective casing heating and same protective casing.The dephosphorization of steel all can carry out in the whole process of steel-making, but final dephosphorization all is to adopt external refining to finish, and its process is: after the tapping of electric furnace dephosphorization, be blown into gas in LF, carry out the strong mixing dephosphorization; Remove dephosphorized slag fully, prevent rephosphorization, carry out reduction refining then; Winding-up Ca-Si pulvis obtains ultra-low phosphoretic steel.Plastic occluded foreignsubstance in the steel and brittle inclusion are the main roots that produces HIC, analysis revealed HIC port surface has the MnS of extension and Al2O3 point chain to be mingled with, and the formation of the formation of SSC and HIC is closely related, in order to improve anti-SSC ability, must reduce inclusion in the steel as far as possible, accurately control the form of inclusion, calcium is handled can control the form of steel inclusion well, thereby improves the anti-SSCC ability of steel.Cast circular steel billet with curved type continuous caster after smelting steel is finished, should strictly control molten steel overheat, casting speed and cooling water inflow during throwing, should adopt long nozzle protection cast.
2. tube rolling
Pipe is at 28mm or 14m ring furnace internal heating, the heating of employing microcomputer control, according to the combustion gas calorific value reasonably regulate combustion gas and air empty so than, 1250～1270 ℃ of heating of pipe blank temperature, guarantee that heating of pipe blank time and temperature are even, the cone type piercer of godet or guide plate about the pipe perforation is adopted and is with, when piercing pipe, adjusts by tapping machine every processing parameter, for tube rolling provides wall thickness deviation little, wall thickness is even, the hollow billet of suitable external diameter, hollow billet after the perforation adopts ACCU-ROLL, and accurate tube rolling mill is rolling can obtain the higher hollow forging of wall thickness accuracy, owing to be oblique milling, some inhomogeneity of wall thickness that it can bring perforation are done further to correct, the inhomogeneity of wall thickness of hollow forging can further be controlled at ± 5% in, the tension reducing unit guarantees to obtain the steel pipe that external diameter and wall thickness accuracy satisfy standard-required, six-roller straightener guarantees that the straight degree of steel pipe is controlled at 1.5mm/m, by designing suitable rolling technological parameter, adopt high-quality warp tool, as: the top, roll, plug, godets etc. also are optimized steel pipe surfaces externally and internally quality.
3, modified thermal treatment and processing
In heat treatment furnace by can make the steel pipe integral performance evenly make it satisfy standard-required to steel pipe integral quenching+temper, and can obtain the best tempered sorbite tissue of anti-H 2 S stress corrosion after the modified thermal treatment, guarantee that steel has good anti-H 2 S stress corrosion cracking performance.Adopt hot size and high-temperature straightening Technology after thermal treatment is come out of the stove, guarantee the external diameter precision of steel pipe, the most important thing is to reduce the unrelieved stress in the steel pipe as far as possible.By the Zhi Jinhang ultrasonic inspection, the flaw detection grade is L2 after the thermal treatment, to guarantee inside and outside surface of steel pipe and internal soundness.
Quenching-and-tempering process: 820～940 ℃ of+630～650 ℃ of tempering of quenching.
The high-temperature straightening temperature is greater than 500 ℃.Should carry out stress relief annealing when being lower than 500 ℃ handles.
Screw thread adopts the processing of umber of feed inlet controlled machine, guarantees that working accuracy meets API standard code requirement, and every steel pipe is done the water test, guarantees that the voltage stabilizing time is no less than 10 seconds.
By the utilization of above manufacture method, make the anti-H 2 S stress corrosion cracking of steel pipe of the present invention and hydrogen-induced cracking resistance reach good quality level with other performances, below division as follows:
The A chemical ingredients
Steel pipe composition of the present invention is even, fluctuation range is little, and harmful element content such as P, S are low, meets API5CT and composition designing requirement fully, thereby has favorable tissue and the performance condition that provides the foundation for steel pipe.The chemical ingredients statistic analysis result sees Table 2
Table 2 steel pipe chemical ingredients of the present invention statistics (weight %)
| Element | C | Si | Mn | P | S | Ni | Cr | Mo | Cu | Nb | Ti | B |
| Mean value | 0.24 | 0.20 | 0.85 | 0.010 | 0.003 | 0.05 | 0.95 | 0.65 | 0.10 | 0.035 | 0.025 | 0.0014 |
The B mechanical property
On the tubing after the modified thermal treatment, get one group of stretching, impact and hardness test check for every batch, the assay statistical average value sees Table 3
Table 3 steel pipe mechanical properties test of the present invention statistics
The C metallographic structure
The microstructure of steel pipe of the present invention is even, crystal grain is tiny, the horizontal grade summation of non-metallic inclusion is less than 3 grades, and inspection statistics the results are shown in Table 4
Table 4 inclusion of the present invention and metallographic structure statistics
The working accuracy of D steel pipe screw thread
Steel pipe accuracy of screw machining height of the present invention, every index all are controlled at half that API 5B allows.The thread taper of two important indicators of embodiment steel pipe thread quality characteristic and the concrete parameter of accurate distance are:
Tight distance: all take off data are all in 50% of API standard.
Thread taper: the thread taper 90% of steel pipe is all between 0.0625-0.0635in.
E anti-H 2 S stress corrosion performance
Steel pipe of the present invention carries out the anti-H 2 S stress corrosion test according to the NACE TMO177 A method of NACE TMO175 standard code, the result shows to have good anti-H 2 S stress corrosion performance, and its anti-H 2 S stress corrosion threshold value reaches 85%SMYS (nominal SMYS).
F steel pipe use properties
Steel pipe of the present invention has carried out the homogeneous tube benchmark test on the steel pipe combined testing machine, the result shows that it has excellent use properties, its strength of joint, sealing property, conquassation value, body stretching and anti-stick button performance can satisfy the regulation of API 5C1 and API 5C2 standard fully, meet the service requirements in oil field.
More than be the application's a embodiment, should be understood that these embodiment only are used to the present invention is described and are not used in to limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Claims (5)
1, a kind of high intensity oil casing tube for resisting sulfurated hydrogen corrosion, it is characterized in that managing composition counts with weight %: C 0.20～0.25%, Si≤0.25%, Mn 0.80～1.50%, P≤0.015%, S≤0.005%, Mo 0.60～1.4%, and Cr 0.90～1.30%, and B 0.0005～0.010%, Ti 0.01～0.10%, Nb0.03～0.10%, As≤0.020%, Sn≤0.020%, Cu≤0.30%, Ni≤0.30%, Al≤0.02%, (H)≤0.0002%, (N)≤0.008%, surplus are iron.
2, high intensity oil casing tube for resisting sulfurated hydrogen corrosion as claimed in claim 1 is characterized in that: the anti-H 2 S stress threshold value 〉=85%SMYS of pipe.
3, the manufacture method of high intensity oil casing tube for resisting sulfurated hydrogen corrosion as claimed in claim 1, it is characterized in that: comprise at first raw material molten iron and steel scrap made steel and make circular pipe blank, then circular pipe blank hot rolling tube rolling is made light pipe, at last finished product is processed in modified thermal treatment of light pipe and pipe; Wherein make steel and make circular pipe blank after step comprises smelting, external refining and vacuum outgas and arc continuous casting.
4, the manufacture method of high intensity oil casing tube for resisting sulfurated hydrogen corrosion as claimed in claim 3 is characterized in that:
Described steel-making adopts LF stove and VOD stove to carry out refining and vacuum outgas and hello silk for adopting oxygen coverter or electrosmelting, adopts the ACC continuous casting to make circular pipe blank;
Described tube rolling heats circular pipe blank at first adopting rotary heating furnace, adopts two roller tapered rollers perforation then, tube rolling mill is rolling and 14 sizing mill tube reducings, and through aligning and sawing finishing procedure, after non-destructive test(ing)(NDT) gets light pipe;
Described modified thermal treatment and pipe are processed as twisting and connect and the homogeneous tube water test by pipe end car silk, box cupling after the modified thermal treatment of light pipe, make the processed oil sleeve pipe at last.
5, as the manufacture method of claim 3 or 4 described high intensity oil casing tube for resisting sulfurated hydrogen corrosion, it is characterized in that described quenching-and-tempering process: 820～940 ℃ of+630～650 ℃ of tempering of quenching.
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