CN107385323B - A kind of big expansion rate welded tube of J55 grade of steel and preparation method thereof - Google Patents

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

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Publication number
CN107385323B
CN107385323B CN201710425466.XA CN201710425466A CN107385323B CN 107385323 B CN107385323 B CN 107385323B CN 201710425466 A CN201710425466 A CN 201710425466A CN 107385323 B CN107385323 B CN 107385323B
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welded tube
heating
steel
expansion rate
pipe
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CN107385323A (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

Abstract

The invention discloses big expansion rate welded tubes of a kind of J55 grade of steel and preparation method thereof, the chemical component of big expansion rate welded tube is by weight percent are as follows: 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；It is smelted using the raw material of the chemical component into slab, then heating of plate blank is rolled and coils into roll bending；Pipe is made in roll bending 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 holding are implemented to gained thermo-mechanical rolling pipe, it is final to obtain the big expansion rate welded tube of J55 grade of steel, 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 is effectively ensured meet API Spec 5CT-J55 standard requirements.

Description

A kind of big expansion rate welded tube of J55 grade of steel and preparation method thereof
Technical field:
The invention belongs to welded tube technical fields, and in particular to a kind of big expansion rate welded tube of J55 grade of steel and preparation method thereof.
Background technique:
Single wellbore technology is also referred to as " equal diameter drilling well ", exactly abandons original casing sequence, utilizes the skill of expandable tubular Art characteristic replaces casing with expandable tubular, the expansion tube of the multistage same size of tripping in and well cementation in wellbore, can not only be effective It solves the problems, such as that the tail pipe size as caused by tapering type well depth structure is small, influences oil productive capacity, wellbore can also not sacrificed Bad ground is insulated in the case where diameter dimension, reduces the frictional resistance of limitation wellbore horizontal displacement, improves bit speed, significantly It reduces and bores 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 many advantages, such as that wall thickness dimension precision is high, inner wall is much favored by the market without helical form scratch defects. J55 grade of steel is an important petroleum casing pipe grade of steel in U.S.'s API Spec 5CT standard, the oil and gas exploration in China Development field consumption is larger, but the domestic big expansion rate of J55 grade of steel that there is no technology maturation at present may expand pipe material product.
Summary of the invention:
The purpose of the present invention is to provide big expansion rate welded tube of a kind of J55 grade of steel and preparation method thereof, by reasonably at Set up forming-welding technology, weld seam heat treatment, welded tube thermo-mechanical rolling, On-line Control cooling treatment and γ that meter combines steel pipe separately + α two-phase section isothermal holding enables tubing to have good expansiveness and mechanical property, and the expansion tube warp >=20% is radial 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 are as follows: a kind of big expansion rate welded tube of J55 grade of steel, institute State the chemical component of big expansion rate welded tube by weight percent are as follows: 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 keep away The impurity exempted from.
A kind of preparation method of the big expansion rate welded tube of J55 grade of steel, comprises the step of:
Step 1: the raw material of above-mentioned chemical component being smelted into slab, then heating of plate blank is rolled to and coiled 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, molding, obtains HFW weldering Connect steel pipe, and the inside and outside overlap height of weld seam modified, interior overlap height and outer overlap height≤0.25mm；
Step 3: carrying out thermo-mechanical rolling processing and On-line Control cooling treatment to HFW welded still pipe, thus needed for obtaining The pipe of specification, thermo-mechanical rolling temperature are 850~1050 DEG C；
Step 4: use gas furnace by heating of pipe blank to γ+α two-phase section Ac320~60 DEG C below, 2~8h is kept the temperature, finally It is cooled to room temperature, obtains the big expansion rate welded tube of J55 grade of steel.
The heating method of weld seam burning optimization on line described in above-mentioned steps two be mid-frequency induction heating, heating temperature be 400~ 850℃。
The processing of thermo-mechanical rolling described in above-mentioned steps three uses electromagnetic induction heating.
The cooling cooling medium of On-line Control described in above-mentioned steps three 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:
1, the present invention makes roll bending have good strong plasticity by the design to ingredient, rolling and coiling temperature, convenient for volume Plate unreel and slitting.
2, the present invention uses electromagnetic induction heating and On-line Control cooling technique, effectively shortens tubing heat treatment production week Phase.
3, 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 is effectively ensured meet API Spec 5CT-J55 standard requirements.
Specific embodiment:
Embodiment 1:
The present embodiment welded tube steel chemical composition mass percent are as follows: C:0.04%, Si:0.22%, Mn:3.75%, Mo: 0.38%, V:0.026%, S:0.004%, P:0.012%, surplus are Fe and inevitable impurity.
After molten steel after converter smelting, external refining is carried out Ca processing, it is casting continuously to form slab.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is greater 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, molding, HFW welding and weld seam heat treatment were made 193.7 × 7.3mm of φ Pipe, mid-frequency induction heating carry out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, and heating time is 20-60s then modifies the inside and outside overlap of weld seam, interior overlap height and outer overlap height≤0.25mm.
HFW welded tube is heated to 980~1050 DEG C, 15~90s of heating time using electromagnetic induction heating, recycles heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tube and obtains φ 139.7 × 7.8mm pipe, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, then using online controlled cooling device to thermo-mechanical rolling pipe implement On-line Control be cooled to room temperature (hydraulic pressure: 60~ 240KPa, water: 50~300m3/h).Gained heating of pipe blank after On-line Control cooling is protected to 705 DEG C of ranges using gas furnace Temperature is air-cooled to room temperature after 3.5 hours, obtain the big expansion rate welded tube of J55 grade of steel.
Through detecting, the present embodiment welded tube vertical mixing coefficient result is as follows: yield strength 405MPa, tensile strength are 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 Spending is 505MPa, tensile strength 630MPa, and elongation after fracture 23% reaches the J55 grade of steel in API Spec 5CT standard Casing property requirement.
Embodiment 2:
The present embodiment welded tube steel chemical composition mass percent are as follows: C:0.08%, Si:0.29%, Mn:5.12%, Mo: 0.42%, V:0.014%, S:0.003%, P:0.008%, surplus are Fe and inevitable impurity.
After molten steel after converter smelting, external refining is carried out Ca processing, it is casting continuously to form slab.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is greater 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, molding, HFW welding and weld seam heat treatment were made 194 × 7.8mm of φ, Mid-frequency induction heating carries out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, heating time 20- 60s then modifies the inside and outside overlap of weld seam, interior overlap height and outer overlap height≤0.25mm.
HFW welded tube is heated to 980~1050 DEG C, 15~90s of heating time using electromagnetic induction heating, recycles heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tube and obtains φ 140 × 8.5mm pipe, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, then using online controlled cooling device to thermo-mechanical rolling pipe implement On-line Control be cooled to room temperature (hydraulic pressure: 60~ 240KPa, water: 50~300m3/h).Gained heating of pipe blank after On-line Control cooling is protected to 690 DEG C of ranges using gas furnace Temperature is air-cooled to room temperature after 6 hours, obtain the big expansion rate welded tube of J55 grade of steel.
Through detecting, the present embodiment welded tube vertical mixing coefficient result is as follows: yield strength 385MPa, tensile strength are 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 Spending is 535MPa, tensile strength 655MPa, and elongation after fracture 19.5% reaches the J55 steel in API Spec 5CT standard Grade casing property requirement.
Embodiment 3:
The present embodiment welded tube steel chemical composition mass percent are as follows: C:0.11%, Si:0.18%, Mn:2.96%, Mo: 0.39%, V:0.04%, S:0.008%, P:0.011%, surplus are Fe and inevitable impurity.
After molten steel after electric furnace smelting, external refining is carried out Ca processing, it is casting continuously to form slab.Continuous casting steel billet is through 1150- Roll into strip after 1280 DEG C of heating, the finishing temperature of strip is greater 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, molding, HFW welding and weld seam heat treatment were made 219.1 × 8.5mm of φ Pipe, mid-frequency induction heating carry out online normalizing heat treatment to weld seam, and induction heating temperature is 450~820 DEG C, and heating time is 20-60s then modifies the inside and outside overlap of weld seam, interior overlap height and outer overlap height≤0.25mm.
HFW welded tube is heated to 980~1050 DEG C, 15~90s of heating time using electromagnetic induction heating, recycles heat engine Tool rolling equipment implements thermo-mechanical rolling to HFW welded tube and obtains φ 159.3 × 9.3mm pipe, and thermo-mechanical rolling temperature is 850~ 1020 DEG C, then using online controlled cooling device to thermo-mechanical rolling pipe implement On-line Control be cooled to room temperature (hydraulic pressure: 60~ 240KPa, water: 50~300m3/h)。
Gained heating of pipe blank after On-line Control cooling to 700 DEG C of ranges, heat preservation is air-cooled to after 8 hours by room using gas furnace Temperature obtains the big expansion rate welded tube of J55 grade of steel.
Through detecting, the present embodiment welded tube vertical mixing coefficient result is as follows: yield strength 395MPa, tensile strength are 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 Spending is 515MPa, tensile strength 645MPa, and elongation after fracture 22% reaches the J55 grade of steel in API Spec 5CT standard Casing property requirement.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that A specific embodiment of the invention is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not taking off Under the premise of from present inventive concept, several simple deduction or replace can also be made, all shall be regarded as belonging to the present invention by institute Claims of submission determine scope of patent protection.

Claims (1)

1. a kind of preparation method of the big expansion rate welded tube of J55 grade of steel, it is characterised in that: the chemical component of the big expansion rate welded tube By weight percent are as follows: C:0.04~0.08%, Si:0.22~0.29%, Mn:3.75~5.12%, Mo:0.38~ 0.42%, V:0.014~0.026%, S:0.003~0.004%, P:0.008~0.012%, surplus is for Fe and unavoidably Impurity；The preparation method comprises the step of:
Step 1: the raw material of the chemical component is smelted into slab, then heating of plate blank is rolled to and coiled into roll bending, slab Heating temperature is 1150-1280 DEG C, 830 DEG C of the finishing temperature > of heating rolling, 650~725 DEG C of temperature when batching；
Step 2: roll bending carries out HFW welding and weld seam burning optimization on line after unreel, slitting, molding, obtains HFW welding steel Pipe, and modifies the inside and outside overlap height of weld seam, interior overlap height and outer overlap height≤0.25mm；
Step 3: thermo-mechanical rolling processing and On-line Control cooling treatment are carried out to HFW welded still pipe, to obtain required specification Pipe, thermo-mechanical rolling temperature be 850~1020 DEG C；
Step 4: using gas furnace by heating of pipe blank to 690~705 DEG C, 3.5~6h is kept the temperature, room temperature is finally cooled to, obtained The big expansion rate welded tube of J55 grade of steel；
The heating method of weld seam burning optimization on line described in step 2 is mid-frequency induction heating, and heating temperature is 400~820 DEG C, is added The hot time is 20-60s；The processing of thermo-mechanical rolling described in step 3 uses electromagnetic induction heating, using electromagnetic induction heating by HFW Welded tube is heated to 980~1050 DEG C, 15~90s of heating time；The cooling cooling medium of On-line Control described in step 3 is water, water Pressure: 60~240KPa, water: 50~300m3/ h, cooling velocity is between water quenching cooling speed and air cooling velocity；
The vertical mixing coefficient of the welded tube: yield strength is 405MPa or 385MPa, and tensile strength is 600MPa or 615MPa, Uniform elongation is 23.6% or 27.1%, elongation after fracture 43% or 48%；
For the welded tube after fluid pressure type is radially expanded 20%, 25% deformation, the mechanical property of tubing longitudinal direction is respectively as follows: yield strength For 505MPa, 535MPa, tensile strength 630MPa, 655MPa, elongation after fracture 23%, 19.5%.
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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JP4475424B2 (en) * 2003-05-28 2010-06-09 住友金属工業株式会社 Oil well steel pipe for buried pipe expansion
JP4516924B2 (en) * 2006-03-23 2010-08-04 新日本製鐵株式会社 Thin steel plate with excellent surface crack resistance during hot rolling and its manufacturing method
CN105925883B (en) * 2016-05-27 2017-09-15 宝鸡石油钢管有限责任公司 A kind of high-strength and high ductility N80Q petroleum casing pipes and its manufacture method

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