CN107385323A - A kind of big expansion rate welded tube of J55 grade of steels and preparation method thereof - Google Patents

A kind of big expansion rate welded tube of J55 grade of steels and preparation method thereof Download PDF

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Publication number
CN107385323A
CN107385323A CN201710425466.XA CN201710425466A CN107385323A CN 107385323 A CN107385323 A CN 107385323A CN 201710425466 A CN201710425466 A CN 201710425466A CN 107385323 A CN107385323 A CN 107385323A
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China
Prior art keywords
welded tube
expansion rate
grade
steels
big expansion
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CN201710425466.XA
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CN107385323B (en
Inventor
李远征
毕宗岳
何石磊
张峰
韦奉
梁航
周新义
刘新成
黄晓江
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China National Petroleum Corp
Baoji Petroleum Steel Pipe Co Ltd
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China National Petroleum Corp
Baoji Petroleum Steel Pipe 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses big expansion rate welded tube of a kind of J55 grade of steels and preparation method thereof, the chemical composition of big expansion rate welded tube is by weight percent：C：0.03~0.12%, Si：0.15~0.35%, Mn：2.5~5.5%, Mo：0.10~0.50%, V：0.01~0.05%, S≤0.01%, P≤0.015%, surplus are Fe and inevitable impurity；Smelted using the raw material of the chemical composition into slab, then heating of plate blank is rolled and coils into roll bending；Roll bending is made by pipe by HFW welding and weld seam burning optimization on line, then to pipe whole implementation thermo-mechanical rolling, and On-line Control cooling treatment and γ+α two-phase section isothermal holdings are implemented to gained thermo-mechanical rolling pipe, it is final to obtain the big expansion rate welded tube of J55 grade of steels, it ensure that tubing after >=20% is radially expanded deformation, tubing longitudinal direction yield strength is 379~552MPa, tensile strength ＞ 517MPa, elongation percentage ＞ 15%, the properties after tubing expansion are effectively ensured and meet the requirement of API Spec 5CT J55 standards.

Description

A kind of big expansion rate welded tube of J55 grade of steels and preparation method thereof
Technical field:
The invention belongs to welded tube technical field, and in particular to a kind of big expansion rate welded tube of J55 grade of steels and preparation method thereof.
Background technology:
Single well technology is also referred to as " equal diameter drilling well ", exactly abandons original sleeve pipe sequence, utilizes the skill of expandable tubular Art characteristic, sleeve pipe is replaced with expandable tubular, the expansion tube of the multistage same size of tripping in and well cementation in well can not only be effective Solve the problems, such as, because tail pipe size caused by tapering type well depth structure is small, influences oil productive capacity, well can also not sacrificed Bad ground is insulated in the case of diameter dimension, reduces the frictional resistance of limitation well horizontal displacement, improves bit speed, significantly Reduce and bore completion time.Inflatable pipe material product is divided into seamless expansion tube and welding expansion tube two types, relative to seamless swollen For tube expansion, welding expansion tube has the advantages that wall thickness dimension precision is high, inwall is much favored by the market without helical form scratch defects. J55 grade of steels are an important petroleum casing pipe grade of steels in U.S.'s API Spec 5CT standards, the oil and gas exploration in China Development field consumption is larger, but the domestic big expansion rate of J55 grade of steels that there is no technology maturation at present may expand pipe material product.
The content of the invention:
It is an object of the invention to provide big expansion rate welded tube of a kind of J55 grade of steels and preparation method thereof, by reasonably into Set up meter separately with reference to the forming-welding technology of steel pipe, weld seam heat treatment, welded tube thermo-mechanical rolling, On-line Control cooling treatment and γ + α two-phase section isothermal holdings enable tubing to have good expansiveness and mechanical property, and the expansion tube warp >=20% is radially swollen After bulging deformation, tubing longitudinal direction yield strength is 379~552MPa, tensile strength ＞ 517MPa, elongation percentage ＞ 15%.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of big expansion rate welded tube of J55 grade of steels, institute The chemical composition for stating big expansion rate welded tube is by weight percent：C：0.03~0.12%, Si：0.15~0.35%, Mn：2.5 ~5.5%, Mo：0.10~0.50%, V：0.01~0.05%, S≤0.01%, P≤0.015%, surplus are Fe and can not kept away The impurity exempted from.
A kind of preparation method of the big expansion rate welded tube of J55 grade of steels, is comprised the step of：
Step 1：The raw material of above-mentioned chemical composition is smelted into slab, then heating of plate blank is rolled and coils into roll bending, 830 DEG C of the finishing temperature ＞ of heating rolling, 650 DEG C of temperature ＞ when batching；
Step 2：Roll bending carries out HFW welding and weld seam burning optimization on line after unreel, slitting, shaping, obtains HFW welderings Steel pipe is connect, and the inside and outside overlap of weld seam is highly repaired, interior overlap height and outer overlap highly≤0.25mm；
Step 3：Thermo-mechanical rolling processing and On-line Control cooling treatment are carried out to HFW welded still pipes, needed for obtaining The pipe of specification, thermo-mechanical rolling temperature are 850~1050 DEG C；
Step 4：Using gas furnace by heating of pipe blank to γ+α two-phase sections Ac320~60 DEG C below, 2~8h is incubated, finally Room temperature is cooled to, obtains the big expansion rate welded tube of J55 grade of steels.
The mode of heating of weld seam burning optimization on line described in above-mentioned steps two is Frequency Induction Heating, heating-up temperature is 400~ 850℃。
Thermo-mechanical rolling processing uses electromagnetic induction heating described in above-mentioned steps three.
The cooling medium that On-line Control described in above-mentioned steps three cools down is water, hydraulic pressure：60~240KPa, water：50~ 300m3/ h, cooling velocity is between water quenching cooling speed and air cooling velocity.
Beneficial effects of the present invention：
1st, the present invention makes roll bending have good strong plasticity, is easy to roll up by the design to composition, rolling and coiling temperature Plate unreel and slitting.
2nd, the present invention uses electromagnetic induction heating and On-line Control cooling technique, effectively shortens tubing heat treatment production week Phase.
3rd, welded tube produced by the invention is after >=20% is radially expanded deformation, and tubing longitudinal direction yield strength is 379~ 552MPa, tensile strength ＞ 517MPa, elongation percentage ＞ 15%, the properties after tubing expansion are effectively ensured and meet API Spec The requirement of 5CT-J55 standards.
Embodiment：
Embodiment 1：
The present embodiment welded tube is with steel chemical composition mass percent：C：0.04%, Si：0.22%, Mn：3.75%, Mo： 0.38%, V：0.026%, S：0.004%, P：0.012%, surplus is Fe and inevitable impurity.
After molten steel after converter smelting, external refining is carried out into Ca processing, slab is casting continuously to form.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is more than 830 DEG C, roll back plate band be cooled to 725~650 DEG C batch it is coiled Plate.
There is seam weld through what unreel, slitting, milling side, shaping, HFW welding and weld seam heat treatment were made 193.7 × 7.3mm of φ Pipe, Frequency Induction Heating carry out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, and the heat time is 20-60s, then the inside and outside overlap of weld seam is repaired, interior overlap height and outer overlap highly≤0.25mm.
HFW welded tubes are heated to 980~1050 DEG C, 15~90s of heat time using electromagnetic induction heating, recycle heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tubes and obtains φ 139.7 × 7.8mm pipes, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, On-line Control then is implemented to thermo-mechanical rolling pipe using online controlled cooling device and is cooled to room temperature (hydraulic pressure：60~ 240KPa, water：50~300m3/h).Gained heating of pipe blank is protected to 705 DEG C of scopes after using gas furnace, On-line Control is cooled down Temperature is air-cooled to room temperature after 3.5 hours, obtain the big expansion rate welded tube of J55 grade of steels.
After testing, the present embodiment welded tube vertical mixing coefficient result is as follows：Yield strength is 405MPa, and tensile strength is 600MPa, uniform elongation 23.6%, elongation after fracture 43%.
For the present embodiment welded tube after fluid pressure type is radially expanded 20% deformation, the mechanical property of tubing longitudinal direction is as follows：Surrender is strong Spend for 505MPa, tensile strength 630MPa, elongation after fracture 23%, reach the J55 grade of steels in API Spec 5CT standards Casing property requirement.
Embodiment 2：
The present embodiment welded tube is with steel chemical composition mass percent：C：0.08%, Si：0.29%, Mn：5.12%, Mo： 0.42%, V：0.014%, S：0.003%, P：0.008%, surplus is Fe and inevitable impurity.
After molten steel after converter smelting, external refining is carried out into Ca processing, slab is casting continuously to form.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is more than 830 DEG C, roll back plate band be cooled to 725~650 DEG C batch it is coiled Plate.
There is seam welded tube through what unreel, slitting, milling side, shaping, HFW welding and weld seam heat treatment were made 194 × 7.8mm of φ, Frequency Induction Heating carries out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, heat time 20- 60s, then the inside and outside overlap of weld seam is repaired, interior overlap height and outer overlap highly≤0.25mm.
HFW welded tubes are heated to 980~1050 DEG C, 15~90s of heat time using electromagnetic induction heating, recycle heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tubes and obtains φ 140 × 8.5mm pipes, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, On-line Control then is implemented to thermo-mechanical rolling pipe using online controlled cooling device and is cooled to room temperature (hydraulic pressure：60~ 240KPa, water：50~300m3/h).Gained heating of pipe blank is protected to 690 DEG C of scopes after using gas furnace, On-line Control is cooled down Temperature is air-cooled to room temperature after 6 hours, obtain the big expansion rate welded tube of J55 grade of steels.
After testing, the present embodiment welded tube vertical mixing coefficient result is as follows：Yield strength is 385MPa, and tensile strength is 615MPa, uniform elongation 27.1%, elongation after fracture 48%.
For the present embodiment welded tube after fluid pressure type is radially expanded 25% deformation, the mechanical property of tubing longitudinal direction is as follows：Surrender is strong Spend for 535MPa, tensile strength 655MPa, elongation after fracture 19.5%, reach the J55 steel in API Spec 5CT standards Level casing property requirement.
Embodiment 3：
The present embodiment welded tube is with steel chemical composition mass percent：C：0.11%, Si：0.18%, Mn：2.96%, Mo： 0.39%, V：0.04%, S：0.008%, P：0.011%, surplus is Fe and inevitable impurity.
After molten steel after electric furnace smelting, external refining is carried out into Ca processing, slab is casting continuously to form.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is more than 830 DEG C, roll back plate band be cooled to 725~650 DEG C batch it is coiled Plate.
There is seam weld through what unreel, slitting, milling side, shaping, HFW welding and weld seam heat treatment were made 219.1 × 8.5mm of φ Pipe, Frequency Induction Heating carry out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, and the heat time is 20-60s, then the inside and outside overlap of weld seam is repaired, interior overlap height and outer overlap highly≤0.25mm.
HFW welded tubes are heated to 980~1050 DEG C, 15~90s of heat time using electromagnetic induction heating, recycle heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tubes and obtains φ 159.3 × 9.3mm pipes, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, On-line Control then is implemented to thermo-mechanical rolling pipe using online controlled cooling device and is cooled to room temperature (hydraulic pressure：60~ 240KPa, water：50~300m3/h)。
Gained heating of pipe blank to 700 DEG C of scopes, insulation is air-cooled to room after 8 hours after using gas furnace, On-line Control is cooled down Temperature, obtain the big expansion rate welded tube of J55 grade of steels.
After testing, the present embodiment welded tube vertical mixing coefficient result is as follows：Yield strength is 395MPa, and tensile strength is 605MPa, uniform elongation 22.8%, elongation after fracture 42%.
For the present embodiment welded tube after fluid pressure type is radially expanded 20% deformation, the mechanical property of tubing longitudinal direction is as follows：Surrender is strong Spend for 515MPa, tensile strength 645MPa, elongation after fracture 22%, reach the J55 grade of steels in API Spec 5CT standards Casing property requirement.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert The embodiment of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off On the premise of from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention by institute Claims of submission determine scope of patent protection.

Claims (5)

  1. A kind of 1. big expansion rate welded tube of J55 grade of steels, it is characterised in that：The chemical composition of the big expansion rate welded tube presses quality percentage Number is：C：0.03~0.12%, Si：0.15~0.35%, Mn：2.5~5.5%, Mo：0.10~0.50%, V：0.01~ 0.05%, S≤0.01%, P≤0.015%, surplus are Fe and inevitable impurity.
  2. A kind of 2. preparation method of the big expansion rate welded tube of J55 grade of steels according to claim 1, it is characterised in that：The system Preparation Method comprises the step of：
    Step 1：The raw material of the chemical composition is smelted into slab, then heating of plate blank is rolled and coils into roll bending, is heated 830 DEG C of the finishing temperature ＞ of rolling, 650 DEG C of temperature ＞ when batching；
    Step 2：Roll bending carries out HFW welding and weld seam burning optimization on line after unreel, slitting, shaping, obtains HFW welding steel Pipe, and the inside and outside overlap of weld seam is highly repaired, interior overlap height and outer overlap highly≤0.25mm；
    Step 3：Thermo-mechanical rolling processing and On-line Control cooling treatment are carried out to HFW welded still pipes, so as to obtain required specification Pipe, thermo-mechanical rolling temperature be 850~1050 DEG C；
    Step 4：Using gas furnace by heating of pipe blank to γ+α two-phase sections Ac320~60 DEG C below, 2~8h is incubated, is finally cooled down To room temperature, the big expansion rate welded tube of J55 grade of steels is obtained.
  3. A kind of 3. preparation method of the big expansion rate welded tube of J55 grade of steels according to claim 2, it is characterised in that：Step 2 The mode of heating of the weld seam burning optimization on line is Frequency Induction Heating, and heating-up temperature is 400~850 DEG C.
  4. A kind of 4. preparation method of the big expansion rate welded tube of J55 grade of steels according to claim 2, it is characterised in that：Step 3 The thermo-mechanical rolling processing uses electromagnetic induction heating.
  5. A kind of 5. preparation method of the big expansion rate welded tube of J55 grade of steels according to claim 2, it is characterised in that：Step 3 The cooling medium of On-line Control cooling is water, hydraulic pressure：60~240KPa, water：50~300m3/ h, cooling velocity between Between water quenching cooling speed and air cooling velocity.
CN201710425466.XA 2017-06-08 2017-06-08 A kind of big expansion rate welded tube of J55 grade of steel and preparation method thereof Active CN107385323B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007253199A (en) * 2006-03-23 2007-10-04 Nippon Steel Corp Thin steel plate having excellent surface cracking resistance during hot rolling, and its manufacturing method
CN100554473C (en) * 2003-05-28 2009-10-28 住友金属工业株式会社 Bury the expander oil well steel pipe underground
CN105925883A (en) * 2016-05-27 2016-09-07 宝鸡石油钢管有限责任公司 High-strength and high-toughness N80Q petroleum casing pipe and manufacturing method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100554473C (en) * 2003-05-28 2009-10-28 住友金属工业株式会社 Bury the expander oil well steel pipe underground
JP2007253199A (en) * 2006-03-23 2007-10-04 Nippon Steel Corp Thin steel plate having excellent surface cracking resistance during hot rolling, and its manufacturing method
CN105925883A (en) * 2016-05-27 2016-09-07 宝鸡石油钢管有限责任公司 High-strength and high-toughness N80Q petroleum casing pipe and manufacturing method thereof

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