CN104388825B - The anti-CO of below 150ksi grade of steel that CPE unit produces2the preparation technology of corrosion oil well pipe - Google Patents

The anti-CO of below 150ksi grade of steel that CPE unit produces2the preparation technology of corrosion oil well pipe Download PDF

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CN104388825B
CN104388825B CN201410687981.1A CN201410687981A CN104388825B CN 104388825 B CN104388825 B CN 104388825B CN 201410687981 A CN201410687981 A CN 201410687981A CN 104388825 B CN104388825 B CN 104388825B
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pipe
steel
component
oil well
temperature
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CN104388825A (en
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李珺
敬磊
郭兴邦
郭照生
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Jiangsu Changbao Steel Tube Co ltd
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Jiangsu Changbao Steel Tube Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
    • C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium

Abstract

The invention discloses the anti-CO of below 150ksi grade of steel that a kind of CPE unit produces2The preparation technology of corrosion oil well pipe, this technique comprises the steps of: the molten steel after converter smelting by converter smelting according to the mass percent proportioning of each component and each component, and is carried out continuous casting and rolling and becomes pipe by (1)；Wherein, the mass percent of its component and each component is as follows: C:0.13% ~ 0.23%；Si:0.11%~0.41%；Mn:0.8%~1.0%；Cr:5.0%~6.0%；Mo:0.05%~0.45%；Al:0.02% ~ 0.04%, remaining is Fe and inevitable impurity, amounts to 100%.The steel pipe rolling out by this technique, surface quality is good, and dimensional accuracy is high, can be effectively improved the anti-collapse property of body, and be also beneficial to improve the anti-CO of steel pipe2Corrosive nature, mechanical properties of pipe reaches below 150ksi, is suitable for deep & ultra-deep well exploitation and uses.

Description

The anti-CO of below 150ksi grade of steel that CPE unit produces2The preparation technology of corrosion oil well pipe
Technical field
The present invention relates to the anti-CO of below 150ksi grade of steel that a kind of CPE unit produces2The preparation technology of corrosion oil well pipe, belongs to In steel for oil well pipes technical field.
Background technology
At present, along with the increasing of China's oil construction of natural gas fields dynamics, the oil well casing and the oil pipe that gather oil gas are faced with High Temperature High Pressure, height are containing CO2, the strong corrosive environment that coexists such as Cl-, thus cause oil gas field repeatedly to occur down-hole oil tube to rupture, collection Air dry line leakage accident, causes many oil gas field wells all within about 1 year, to be scrapped in advance due to problems in operation, causes huge Big loss, causes serious harm to the safety of life and property of the people, has also threatened national energy strategy simultaneously Safety.
Having L80-13Cr tubing and casing product in existing API 5CT specification, fertile intensity is 80 and 95 grade of steels, the highest clothes Labour temperature is generally 120 DEG C, and corrosion resisting property is less than 0.25mm/y.Along with oil well and the exploitation of gas well, well depth is also being continuously increased, Well depth exceed 5000m rich in CO2And the Oil/gas Well exceeding API standard 13Cr steel pipe service condition is continuously increased, be badly in need of resistance to more High service temperature (120-150 DEG C), corrosion resisting property are more preferable, the higher 110 steel grade oil sleeve pipes of intensity.
The existing corrosion-resistant alloy oil annular tube steel clear 61-207550 of such as Japan Patent, Unexamined Patent 4-224656, Unexamined Patent 11-140594 etc., it is high Cr-containing alloy, also contains higher nickel and molybdenum.Mainly by increasing alloy content particularly Ni and Mo Deng precious metal alloys, it is ensured that high temperature resistant, CO2, and trace H2S corrosive nature.For deep-well require high temperature resistant 120-150 DEG C, resistance to CO2Corrode and be not required for H2The environment of S corrosion, nickelic, the tubing and casing high cost of molybdenum alloy.
Also have the flat 4-88152 of Japan Patent, but the content of its Cr element is between 14%-16%, belongs to 15Cr martensite Rustless steel category, applied environment and manufacturing process all have a bigger difference, and its intensity rank≤100 grade of steel.
Summary of the invention
The technical problem to be solved is the defect overcoming prior art, it is provided that a kind of CPE unit produces The anti-CO of below 150ksi2The preparation technology of corrosion oil well pipe, the steel pipe rolling out by this technique, surface quality is good, size Precision is high, and particularly Wall thickness uniformity and ovality is good, can be effectively improved the anti-collapse property of body；Secondly as push pipe work Skill belongs to and extends greatly axial rolling, and the steel pipe structure property produced is good, is not likely to produce defect, is also beneficial to improve the anti-of steel pipe CO2Corrosive nature；Using Tempering and Quenching, mechanical properties of pipe reaches 150ksi, is suitable for deep & ultra-deep well exploitation and uses.
In order to solve above-mentioned technical problem, the technical scheme is that below the 150ksi that a kind of CPE unit produces Anti-CO2The preparation technology of corrosion oil well pipe, this technique comprises the steps of:
(1) converter smelting is passed through according to the mass percent proportioning of each component and each component, and by the steel after converter smelting Water carries out continuous casting and rolling and becomes pipe；Wherein, the mass percent of its component and each component is as follows: C:0.13%～0.23%； Si:0.11%～0.41%；Mn:0.8%～1.0%；Cr:5.0%～6.0%；Mo:0.05%～0.45%；Al:0.02% ～0.04%, remaining is Fe and inevitable impurity, amounts to 100%；
(2) pipe prepares: after stripping off the skin pipe, then checks pipe surface and removes defect, then fracture is formed multiple It is in charge of base, base will be in charge of and carry out cold centering；
(3) heating of pipe blank: first the base of being in charge of after fracture is preheated, and held for some time；Again by after preheating It is in charge of base to heat, and held for some time；Wherein, the heating and temperature control of second time heating is at 1200 DEG C～1250 DEG C；
(4) perforation: the base of being in charge of after heating is carried out perforation process, forms the hollow billet temperature after hollow billet, and control punch It is 1200 DEG C～1220 DEG C, then hollow billet is carried out punching rod and reducing processes；
(5) push pipe: keep hollow billet temperature to be not less than 1180 DEG C before entering Push bench pipe mill, and spray lubricant equably, will Hollow billet is carried out continuously by the hollow billet being installed with plug by the roller die arranged continuously on Push bench pipe mill and pass diameter gradually decreases Extend rolling, form hollow forging；
(6) get loose rod: by the hollow forging with plug after mandrel bar loosening mill and rod stripping machine process, the hollow forging after rod slipping off enters Row cooling, then cut at hot saw at the bottom of its base；
(7) reheat: again the hollow forging after step (6) processes is entered reheating furnace and carry out reheating process；Wherein, The ambient temperature that reheating processes is 940 DEG C～960 DEG C；
(8) tube reducing: the hollow forging after reheating, by after water under high pressure dephosphorization, passes through to connect on it through micro-tension reducing unit Hollow forging is rolled by the tube reducing roller die that continuous layout and reducing pass gradually decrease, and reaches the steel of product diameter in the middle of required Pipe；
(9) cooling: again steel pipe cooling on cold bed is processed；
(10) cold rolling: will be through the middle product steel pipe after step (9) cooling processes through sofening treatment, inspection reconditioning, acid After washing, again checking reconditioning, lubrication, phosphatization, carry out cold rolling reaching required fished pipe size；
(11) Tempering and Quenching: fished pipe is sequentially passed through high temperature quenching and lonneal, reaches corresponding grade of steel Energy；Wherein, the temperature range of high temperature quenching is 860 DEG C～950 DEG C, and the temperature range of lonneal is 540 DEG C～640 DEG C；
(12) aligning: the steel pipe after Tempering and Quenching passes through temperature correction, and straightening temperature controls be not less than 350 DEG C, makes steel Pipe linearity is not higher than 1.0mm/m；
(13) finishing, finished product is put in storage.
In described step (5), the temperature of plug controls at 500 DEG C～600 DEG C.
Further for providing its better carbon dioxide corrosion-resistant performance, in step (1), in its component also Adding Ni and Cu, its addition is respectively 0 ＜ Ni≤0.2%；0 ＜ Cu≤0.25%.
Further, Ni:0.15%～0.20%, Cu:0.20%～0.25%.
Further for ensureing to be greatly enhanced on the premise of its good toughness the quenching degree of steel, in step (1), Being also added with B in its component, its addition is 0.0005%～0.002%.
Further, in step (1), its component is also added with Ti, Nb, V, addition be respectively as follows: 0 ＜ Ti≤ 0.25%；0 ＜ Nb≤0.22%；0 ＜ V≤0.25%.
After have employed technique scheme, the Si in the oil well pipe composition of the present invention is effective deoxidizer, adds Si pair The intensity improving steel grade is useful, but adds membership in a large number and reduce toughness and corrosion resistance, thus its content is limited in 0.11%～ In the range of 0.41%；Mn has the strongest deoxidizing capacity, intensity and the toughness of steel grade can be greatly improved, but too much Mn also can Reduce the toughness of steel grade, therefore its content is limited in 0.8%～1.0%；Cr is to improving anti-CO2Erosion performance the most economical and Effective element, along with the increase of Cr content, the anti-CO of steel grade2Corrosive nature is multiplied, in order to reach certain anti-CO2Rotten Erosion property also can control the cost of material simultaneously, and its content is limited in 5.0%～6.0%；The interpolation of Mo can improve the strong of steel Degree and corrosion resistance, by proportion optimizing, control its content 0.05%～0.45%；The content of Al is less than 0.005% Shi Buneng reaches deoxidation effect, but is easily caused field trash during too high levels and increases, and reduces toughness and processing characteristics, is therefore contained Amount controls 0.02%～0.04%；It addition, prior art has anti-CO2The low alloy steel product of corrosive nature mostly is 55ksi, 80ksi grade of steel, and the tubing and casing reaching more than 110KSI grade of steel mostly be chemical composition belong to super 13Cr, 15Cr and The high alloy categories such as 22Cr two phase stainless steel, and the steel alloy that the oil well pipe in the present invention is developed not only has good resisting CO2Corrosive nature, and intensity can reach 150ksi grade of steel, and the cost of alloy of material reduces and manufacturing process is simple, this technique Being the technological process of perforation+push pipe+subtract+cold rolling+Tempering and Quenching, by controlling temperature in technical process, deflection divides Join, rolling pass, rolling steel pipe out, surface quality is good, and dimensional accuracy is high, and particularly Wall thickness uniformity and ovality is good, Can be effectively improved the anti-collapse property of body, the intensity of oil well pipe is up to more than 1050MPa, and 0 ° of impact flexibility is up to more than 50J； Secondly as pipe pushing technology belongs to extends greatly axial rolling, the steel pipe structure property produced is good, is not likely to produce defect, the most favorably In the anti-CO improving steel pipe2Corrosive nature；Using Tempering and Quenching, mechanical properties of pipe reaches 150ksi grade of steel, is suitable for deep-well Ultradeep well exploitation uses.
Detailed description of the invention
Be clearly understood to make present disclosure be easier to, below according to specific embodiment, the present invention is made into One step detailed description.
Embodiment one
The steel pipe trimmed size of the present embodiment:
Pipe specification:
Pipe material: 5Cr；
The anti-CO that CPE unit produces2The general steps of manufacturing process of corrosion oil well pipe is: and pipe strips off the skin → and pipe breaks Material, cold centering → be in charge of base preheating → annular furnace heat → be in charge of that base perforation → hollow billet punching is excellent, reducing → push pipe → pine is excellent → De-rod → hot saw → reheating → water under high pressure dephosphorization → stretch reducing → cold bed cools down → checks reconditioning → pickling → again check Reconditioning → lubrication, phosphatization → cold rolling → Tempering and Quenching → aligning → finishing → packaging and warehousing.
The preparation technology of the anti-CO2 corrosion oil well pipe that CPE unit produces, this technique specifically comprises the following steps that
(1) converter smelting is passed through according to the mass percent proportioning of each component and each component, and by the steel after converter smelting Water carries out continuous casting and rolling and becomes pipe；Wherein, the mass percent of its component and each component is as follows: C:0.14%；Si:0.3%； Mn:0.9%；Cr:5.37%；Mo:0.17%；Al:0.029%；Ni:0.19%；Cu:0.24%, remaining is for Fe and can not keep away The impurity exempted from, amounts to 100%.
(2) pipe prepares: after stripping off the skin pipe, again checks pipe surface and removes defect, then fracture is formed many Individual it is in charge of base, base will be in charge of and carry out cold centering；
(3) heating of pipe blank: first the base of being in charge of after fracture is preheated, and held for some time；Again by after preheating It is in charge of base to heat, and held for some time, soaking temperature controls at 1200 DEG C～1250 DEG C；
(4) perforation: the base of being in charge of after heating is carried out perforation process, forms hollow billet, hollow billet specification And the hollow billet temperature after control punch is 1200 DEG C～1220 DEG C, top uses oxidation top, comes directly towards specificationThen Hollow billet carries out punching rod and reducing, and plug uses ladder plug；
(5) push pipe: enter and keep before Push bench pipe mill hollow billet temperature to be not less than 1180 DEG C, plug temperature control at 500 DEG C～ 600 DEG C, and spray lubricant equably, by be installed with the hollow billet of plug by arrange continuously on Push bench pipe mill and pass diameter by The fewest roller die extends rolling continuously to hollow billet, forms hollow forging；Pre-threading travelRoller die uses The mode of new Ao8+4 (8+4 refers to that 8 work housings+4 adjust frame) is designed, and pass parameters see table, hollow forging specification
Table 1 push pipe Ao8+4 pass parameters
(6) get loose rod: by the hollow forging with plug after mandrel bar loosening mill and rod stripping machine process, carries out cold after rod slipping off But, hot saw at the bottom of hollow forging carries out base is cut；
(7) reheat: hollow forging carries out reheating furnace and carries out reheating process；Wherein, the ambient temperature that reheating processes is 940 DEG C～960 DEG C；
(8) tube reducing: the hollow forging after reheating is by, after water under high pressure dephosphorization, arranging continuously on micro-tension reducing unit And hollow forging is rolled by the tube reducing roller die that reducing pass gradually decreases, roller die uses new CR6+2, and (6+2 refers to 6 work housings + 2 adjust frames) mode be designed, pass parameters see table, middle product size
2, table subtracts CR6+2 pass parameters
(9) cooling: steel pipe cooling on cold bed is processed；
(10) cold rolling: to roll middle steel pipe out through sofening treatment, inspection by above-mentioned through step (1)～step (9) Running repair mill, pickling, again check reconditioning, lubrication, phosphatization after, carry out cold rolling reaching required fished pipe size；
(11) Tempering and Quenching: by fished pipe through 900 DEG C of high temperature+560 DEG C of lonneals of quenching；Certainly its temperature is not Being confined to this, the temperature range of high temperature quenching should control at 860 DEG C～950 DEG C, and the temperature range of lonneal should control At 540 DEG C～640 DEG C；
(12) aligning: the steel pipe after heat treatment passes through temperature correction, and straightening temperature controls be not less than 350 DEG C, steel pipe straight line Degree not higher than 1.0mm/m.
(13) finishing, finished product is put in storage.
Through anti-CO prepared by the present embodiment technique2Corrosion oil well pipe reaches 80ksi grade of steel, and dimensional accuracy is high, surface matter Measuring, mechanical property is as follows: yield strength 657MPa, tensile strength 756MPa, elongation percentage 20%.
Such as following table after size and flaw detection:
Embodiment two
The anti-CO that the CPE unit of the present embodiment produces2The preparation technology of corrosion oil well pipe is essentially identical with embodiment one, It is not both: in described step (1), wherein, its component and the mass percent of each component are as follows:
C:0.16%；Si:0.3%；Mn:0.85%；Cr:5.29%；Mo:0.45%；Al:0.031%；Ni:0.18%； Cu:0.24%, remaining is Fe and inevitable impurity, amounts to 100%.
Through anti-CO prepared by the present embodiment technique2Corrosion oil well pipe reaches 110ksi grade of steel, and dimensional accuracy is high, surface matter Measuring, mechanical property is as follows: yield strength 861MPa, tensile strength 950MPa, elongation percentage 15%.
Embodiment three
The anti-CO that the CPE unit of the present embodiment produces2The preparation technology of corrosion oil well pipe is essentially identical with embodiment one, It is not both: in described step (1), wherein, its component and the mass percent of each component are as follows:
C:0.18%；Si:0.2%；Mn:0.8%；Cr:5.0%；Mo:0.05%；Al:0.02%；B:0.0005%；Its Remaining is Fe and inevitable impurity, amounts to 100%.
Through anti-CO prepared by the present embodiment technique2Corrosion oil well pipe reaches 130ksi grade of steel, and dimensional accuracy is high, surface matter Measuring, mechanical property is as follows: yield strength 972MPa, tensile strength 1051MPa, elongation percentage 16%.
Embodiment four
The anti-CO that the CPE unit of the present embodiment produces2The preparation technology of corrosion oil well pipe is essentially identical with embodiment one, It is not both: in described step (1), wherein, its component and the mass percent of each component are as follows:
C:0.2%；Si:0.41%；Mn:1.0%；Cr:6.0%；Mo:0.2%；Al:0.04%, remaining is Fe and can not The impurity avoided, amounts to 100%.
Through anti-CO prepared by the present embodiment technique2Corrosion oil well pipe reaches 140ksi grade of steel, and dimensional accuracy is high, surface matter Measuring, mechanical property is as follows: yield strength 1017MPa, tensile strength 1111MPa, elongation percentage 17%.
Embodiment five
The anti-CO that the CPE unit of the present embodiment produces2The preparation technology of corrosion oil well pipe is essentially identical with embodiment one, It is not both: in described step (1), wherein, its component and the mass percent of each component are as follows:
C:0.22%；Si:0.41%；Mn:0.9%；Cr:6.0%；Mo:0.1%；Al:0.03%；Ti:0.2%；Nb: 0.15%；V:0.20%, remaining is Fe and inevitable impurity, amounts to 100%.
Through anti-CO prepared by the present embodiment technique2Corrosion oil well pipe reaches 150ksi grade of steel, and dimensional accuracy is high, surface matter Measuring, mechanical property is as follows: yield strength 1129MPa, tensile strength 1231MPa, elongation percentage 16%.
Si in the oil well pipe composition of the present invention is effective deoxidizer, and addition Si is useful to the intensity improving steel grade, but Add membership in a large number and reduce toughness and corrosion resistance, so in the range of its content is limited in 0.11%～0.41%；Mn has the strongest Deoxidizing capacity, intensity and the toughness of steel grade can be greatly improved, but too much Mn also can reduce the toughness of steel grade, therefore by it Content is limited in 0.8%～1.0%；Cr is to improving anti-CO2Erosion performance the most economically and efficiently element, along with Cr content Increase, the anti-CO of steel grade2Corrosive nature is multiplied, in order to reach certain anti-CO2Corrosivity also can control the one-tenth of material simultaneously This, be limited in 5.0%～6.0% by its content；The interpolation of Mo can improve intensity and the corrosion resistance of steel, is joined by optimization Ratio, controls its content 0.05～0.45%；Deoxidation effect can not be reached when the content of Al is less than 0.005%, but content mistake It is easily caused field trash time high to increase, reduces toughness and processing characteristics, therefore its content is controlled 0.02～0.04%；It addition, Prior art has anti-CO2The low alloy steel product of corrosive nature mostly is 55ksi, 80ksi grade of steel, and reaches 110KSI steel Tubing and casing more than level mostly is chemical composition and belongs to the high alloy categories such as super 13Cr, 15Cr and 22Cr two phase stainless steel, and The steel alloy that oil well pipe in the present invention is developed not only has good anti-CO2Corrosive nature, and intensity is 150Ksi steel Level, the cost of alloy of material reduces and manufacturing process is simple, and this technique is that perforation+push pipe+open subtracts+cold rolling+Tempering and Quenching Technological process, by the temperature in control technical process, deformation distribution, rolling pass, rolling steel pipe out, surface quality Good, dimensional accuracy is high, and particularly Wall thickness uniformity and ovality is good, can be effectively improved the anti-collapse property of body, oil well pipe Intensity is up to more than 1050MPa, and 0 ° of impact flexibility is up to more than 50J；Secondly as pipe pushing technology belongs to extends greatly axial rolling, raw The steel pipe structure property that output is come is good, is not likely to produce defect, is also beneficial to improve the anti-CO of steel pipe2Corrosive nature；Use quenched Heat treatment, mechanical properties of pipe reaches 150Ksi, is suitable for deep & ultra-deep well exploitation and uses.
Particular embodiments described above, to present invention solves the technical problem that, technical scheme and beneficial effect carry out Further describe, be it should be understood that the specific embodiment that the foregoing is only the present invention, be not limited to The present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in this Within the protection domain of invention.

Claims (5)

1. the anti-CO of below 150ksi grade of steel that a CPE unit produces2The preparation technology of corrosion oil well pipe, it is characterised in that this work Skill comprises the steps of:
(1) pass through converter smelting according to the mass percent proportioning of each component and each component, and the molten steel after converter smelting is entered Row continuous casting and rolling becomes pipe；Wherein, the mass percent of its component and each component is as follows: C:0.13%～0.23%；Si: 0.11%～0.41%；Mn:0.8%～1.0%；Cr:5.0%～6.0%；Mo:0.05%～0.45%；Al:0.02%～ 0.04%, remaining is Fe and inevitable impurity, amounts to 100%；
(2) pipe prepares: after stripping off the skin pipe, then checks pipe surface and removes defect, then fracture forms multiple being in charge of Base, will be in charge of base and carry out cold centering；
(3) heating of pipe blank: first the base of being in charge of after fracture is preheated, and held for some time；Again by being in charge of after preheating Base heats, and held for some time；Wherein, the heating and temperature control of second time heating is at 1200 DEG C～1250 DEG C；
(4) perforation: the base of being in charge of after heating is carried out perforation process, forming the hollow billet temperature after hollow billet, and control punch is 1200 DEG C～1220 DEG C, then hollow billet is carried out punching rod and reducing processes；
(5) push pipe: keep hollow billet temperature to be not less than 1180 DEG C before entering Push bench pipe mill, and spray lubricant equably, will be installed with Hollow billet is extended continuously by the hollow billet of plug by the roller die arranged continuously on Push bench pipe mill and pass diameter gradually decreases Rolling, forms hollow forging；Wherein, the temperature of plug controls at 500 DEG C～600 DEG C；
(6) get loose rod: by the hollow forging with plug after mandrel bar loosening mill and rod stripping machine process, the hollow forging after rod slipping off carries out cold But, then at hot saw at the bottom of its base cut；
(7) reheat: again the hollow forging after step (6) processes is entered reheating furnace and carry out reheating process；Wherein, then add The ambient temperature of heat treatment is 940 DEG C～960 DEG C；
(8) tube reducing: the hollow forging after reheating, by after water under high pressure dephosphorization, passes through continuous cloth on it through micro-tension reducing unit Put and hollow forging is rolled by tube reducing roller die that reducing pass gradually decreases, reach the steel pipe of product diameter in the middle of required；
(9) cooling: again steel pipe cooling on cold bed is processed；
(10) cold rolling: will through middle the product steel pipe after step (9) cooling processes through sofening treatment, check reconditioning, pickling, again After secondary inspection reconditioning, lubrication, phosphatization, carry out cold rolling reaching required fished pipe size；
(11) Tempering and Quenching: fished pipe is sequentially passed through high temperature quenching and lonneal, reaches corresponding grade of steel；Wherein, The temperature range of high temperature quenching is 860 DEG C～950 DEG C, and the temperature range of lonneal is 540 DEG C～640 DEG C；
(12) aligning: the steel pipe after Tempering and Quenching passes through temperature correction, and straightening temperature controls be not less than 350 DEG C, makes steel pipe straight Dimension is not higher than 1.0mm/m；
(13) finishing, finished product is put in storage.
The anti-CO of below 150ksi grade of steel that CPE unit the most according to claim 1 produces2The preparation technology of corrosion oil well pipe, It is characterized in that: in step (1), be also added with Ni and Cu in its component, its addition is respectively 0 ＜ Ni≤0.2%；0 ＜ Cu≤0.25%.
The anti-CO of below 150ksi grade of steel that CPE unit the most according to claim 2 produces2The preparation technology of corrosion oil well pipe, It is characterized in that: Ni:0.15%～0.20%, Cu:0.20%～0.25%.
The anti-CO of below 150ksi grade of steel that CPE unit the most according to any one of claim 1 to 3 produces2Corrosion oil well pipe Preparation technology, it is characterised in that: in step (1), its component is also added with B, its addition be 0.0005%～ 0.002%.
The anti-CO of below 150ksi grade of steel that CPE unit the most according to any one of claim 1 to 3 produces2Corrosion oil well pipe Preparation technology, it is characterised in that: in step (1), being also added with Ti, Nb, V in its component, addition is respectively as follows: 0 ＜ Ti ≤ 0.25%；0 ＜ Nb≤0.22%；0 ＜ V≤0.25%.
CN201410687981.1A 2014-11-25 2014-11-25 The anti-CO of below 150ksi grade of steel that CPE unit produces2the preparation technology of corrosion oil well pipe Active CN104388825B (en)

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CN111945073A (en) * 2020-08-28 2020-11-17 大冶特殊钢有限公司 110KSI thermal production casing pipe and manufacturing method thereof
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JPS5811735A (en) * 1981-07-13 1983-01-22 Sumitomo Metal Ind Ltd Production of high-strength oil well pipe of superior stress corrosion cracking resistance
CN1619005A (en) * 2003-11-21 2005-05-25 天津钢管有限责任公司 Deep well, ultra deep well petroleum sleev in petroleum natural extraction gas and its production method
CN101929313A (en) * 2009-06-24 2010-12-29 宝山钢铁股份有限公司 High-strength hydrogen-sulfide environmental corrosion-resistant seamless petroleum casing pipe and manufacturing method thereof
CN101956146A (en) * 2010-10-12 2011-01-26 西安建筑科技大学 High strength super-martensitic stainless steel for oil and gas pipelines and preparation method thereof
CN103952634A (en) * 2014-04-02 2014-07-30 攀钢集团成都钢钒有限公司 Anti-CO2 corrosion seamless steel pipe and manufacture method thereof

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JPS5811735A (en) * 1981-07-13 1983-01-22 Sumitomo Metal Ind Ltd Production of high-strength oil well pipe of superior stress corrosion cracking resistance
CN1619005A (en) * 2003-11-21 2005-05-25 天津钢管有限责任公司 Deep well, ultra deep well petroleum sleev in petroleum natural extraction gas and its production method
CN101929313A (en) * 2009-06-24 2010-12-29 宝山钢铁股份有限公司 High-strength hydrogen-sulfide environmental corrosion-resistant seamless petroleum casing pipe and manufacturing method thereof
CN101956146A (en) * 2010-10-12 2011-01-26 西安建筑科技大学 High strength super-martensitic stainless steel for oil and gas pipelines and preparation method thereof
CN103952634A (en) * 2014-04-02 2014-07-30 攀钢集团成都钢钒有限公司 Anti-CO2 corrosion seamless steel pipe and manufacture method thereof

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