CN115433870A - Low-cost quenched and tempered steel for continuous oil pipe, hot-rolled steel strip, steel pipe and manufacturing method thereof - Google Patents
Low-cost quenched and tempered steel for continuous oil pipe, hot-rolled steel strip, steel pipe and manufacturing method thereof Download PDFInfo
- Publication number
- CN115433870A CN115433870A CN202110613116.2A CN202110613116A CN115433870A CN 115433870 A CN115433870 A CN 115433870A CN 202110613116 A CN202110613116 A CN 202110613116A CN 115433870 A CN115433870 A CN 115433870A
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- steel
- low
- cost
- tempered
- quenched
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 311
- 239000010959 steel Substances 0.000 title claims abstract description 311
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 47
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 19
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 10
- 239000012535 impurity Substances 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 52
- 238000005496 tempering Methods 0.000 claims description 32
- 238000010791 quenching Methods 0.000 claims description 19
- 230000000171 quenching effect Effects 0.000 claims description 19
- 238000003723 Smelting Methods 0.000 claims description 14
- 238000009749 continuous casting Methods 0.000 claims description 14
- 230000006698 induction Effects 0.000 claims description 14
- 229910001563 bainite Inorganic materials 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims description 9
- 229910052748 manganese Inorganic materials 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 238000000137 annealing Methods 0.000 description 2
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- 210000001503 joint Anatomy 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
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- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000005204 segregation Methods 0.000 description 2
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- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- HMUNWXXNJPVALC-UHFFFAOYSA-N 1-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C(CN1CC2=C(CC1)NN=N2)=O HMUNWXXNJPVALC-UHFFFAOYSA-N 0.000 description 1
- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 1
- WZFUQSJFWNHZHM-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)CC(=O)N1CC2=C(CC1)NN=N2 WZFUQSJFWNHZHM-UHFFFAOYSA-N 0.000 description 1
- YJLUBHOZZTYQIP-UHFFFAOYSA-N 2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)N1CC2=C(CC1)NN=N2 YJLUBHOZZTYQIP-UHFFFAOYSA-N 0.000 description 1
- JJPWJEGNCRGGGA-UHFFFAOYSA-N 4-[[2-[5-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-1,3,4-oxadiazol-2-yl]acetyl]amino]benzoic acid Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C1=NN=C(O1)CC(=O)NC1=CC=C(C(=O)O)C=C1 JJPWJEGNCRGGGA-UHFFFAOYSA-N 0.000 description 1
- CONKBQPVFMXDOV-QHCPKHFHSA-N 6-[(5S)-5-[[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]piperazin-1-yl]methyl]-2-oxo-1,3-oxazolidin-3-yl]-3H-1,3-benzoxazol-2-one Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)N1CCN(CC1)C[C@H]1CN(C(O1)=O)C1=CC2=C(NC(O2)=O)C=C1 CONKBQPVFMXDOV-QHCPKHFHSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910000922 High-strength low-alloy steel Inorganic materials 0.000 description 1
- 229910000742 Microalloyed steel Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
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- 230000002401 inhibitory effect Effects 0.000 description 1
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- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000013386 optimize process Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 239000011574 phosphorus Substances 0.000 description 1
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- 229910052720 vanadium Inorganic materials 0.000 description 1
Classifications
-
- 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
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- 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
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
-
- 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/20—Flexible or articulated drilling pipes, e.g. flexible or articulated rods, pipes or cables
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Manufacturing & Machinery (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
The invention discloses low-cost quenched and tempered steel for a continuous oil pipe, which comprises the following chemical elements in percentage by mass except Fe and inevitable impurities: c:0.18-0.32%, si:0.05 to 0.30%, mn:0.90-2.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.10-0.50%, ti:0.008-0.025%, cu:0.10-0.40%, ni:0.05-0.30%, B:0.002-0.005%, ca:0.001-0.004%, al:0.01-0.05 percent of N and less than or equal to 0.007 percent of N. In addition, the invention also discloses a hot rolled steel strip made of the steel for the quenched and tempered coiled tubing and a steel tube made of the hot rolled steel strip. In addition, the invention also discloses a manufacturing method of the hot-rolled steel strip and the steel pipe. The low-cost quenched and tempered steel for the continuous oil pipe effectively controls the alloy cost, and the manufactured hot rolled steel strip is low in strength and has good shaping, toughness and processability.
Description
Technical Field
The present invention relates to a metal material and a method for producing the same, and particularly to a steel for a quenched and tempered continuous oil pipe, a steel strip, a steel pipe, and a method for producing the same.
Background
Compared with the conventional threaded connection oil pipe, the hardened and tempered Coiled oil pipe (CT) is an oil pipe which is a jointless Coiled pipe formed by obliquely connecting a plurality of sections of steel strips and welding the steel strips through rolling forming, so the hardened and tempered Coiled oil pipe is also called as a flexible oil pipe, a Coiled pipe or a coil pipe. The coiled tubing has outstanding advantages in oil field operation, is rapidly developed in the last decade, is widely applied to the operation processes of oil and gas field well repair, well drilling, well completion, well logging and the like, and is known as an universal operation machine.
In the current coiled tubing application, the conventional low-carbon alloy steel tube is still used as a main material, the conventional CT90 structure generally comprises ferrite, pearlite and bainite, the CT110 structure comprises bainite and a small amount of ferrite, the CT90 and the CT110 are steel grades which are most widely applied at present, and the production difficulty of the CT130 with higher strength is higher.
In the industrial production process, along with the improvement of the steel grade of the low-carbon alloy steel pipe, more alloy elements are generally required to be added, so that the alloy cost is greatly increased, and great pressure is brought to the manufacturing stability and equipment capacity load of each process of rolling steel strips, manufacturing pipes and the like.
In addition, the conventional coiled tubing is generally subjected to simple stress relief annealing after tubing, the structure of a welding seam has great difference with the tubing, the welding part has great residual stress and is more easily corroded, the fatigue life of the welding seam is in a descending trend relative to the tubing along with the improvement of the strength grade of the coiled tubing, and the field failure is also caused frequently. Therefore, it is a current trend of coiled tubing products to further improve the performance of coiled tubing while controlling the alloy cost to cope with complex well conditions.
Based on the above, the invention expects to obtain a low-cost quenched and tempered steel for coiled tubing, a hot rolled steel strip, a steel tube and a manufacturing method thereof, aiming at the difficulty of improving the strength of the conventional coiled tubing, the invention adopts an alloy design different from the conventional coiled tubing, can obtain the hot rolled pickled steel strip for the coiled tubing with lower strength and excellent surface quality by rolling and pickling, and carries out heat treatment on the prepared steel strip after the tubing is manufactured.
Disclosure of Invention
One of the purposes of the invention is to provide a low-cost quenched and tempered steel for a coiled tubing, which adopts a component design idea different from that of a conventional coiled tubing, and effectively controls the alloy cost while improving the strength of steel materials through chemical component design mainly based on carbon and manganese reinforcement and assisting in multielement microalloy. The low-cost quenched and tempered steel for the continuous oil pipe has low cost and excellent performance, can be used for preparing hot rolled steel strips and steel pipes, is effectively applied to the operation fields of oil and gas field drilling, well repair, well completion and the like, and has very good popularization prospect and application value.
In order to achieve the above object, the present invention provides a low-cost quenched and tempered steel for continuous oil pipe, which contains Fe and inevitable impurities, and which further contains the following chemical elements in mass percent:
C：0.18-0.32％、Si：0.05-0.30％、Mn：0.90-2.50％、P≤0.015％、S≤0.005％、Cr：0.10-0.50％、Ti：0.008-0.025％、Cu：0.10-0.40％、Ni：0.05-0.30％、B：0.002-0.005％、Ca：0.001-0.004％、Al：0.01-0.05％、0＜N≤0.007％。
further, in the low-cost quenched and tempered steel for a continuous oil pipe, the mass percentages of the chemical elements are as follows:
c:0.18-0.32%, si:0.05 to 0.30%, mn:0.90-2.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.10-0.50%, ti:0.008-0.025%, cu:0.10-0.40%, ni:0.05-0.30, B:0.002-0.005%, ca:0.001-0.004%, al:0.01 to 0.05 percent, more than 0 and less than or equal to 0.007 percent of N, and the balance of Fe and other inevitable impurities.
In the low-cost quenched and tempered steel for the continuous oil pipe, a component system mainly comprising C and Mn is adopted, and a certain amount of B element is added to increase the hardenability of the steel and ensure that the steel has higher strength after pipe making and heat treatment.
Of course, in some preferred embodiments, appropriate amounts of Nb and Mo can be added into the steel, and the invention can reduce tempering resistance by reducing the contents of Cr and Mo so as to meet the requirement of lower hardness after heat treatment; in addition, in some preferred embodiments, the invention can also add trace amounts of Ti and Nb elements to achieve the effect of refining grains.
In the low-cost quenched and tempered steel for a continuous oil pipe according to the present invention, the design principle of each chemical element is as follows:
c: in the low-cost quenched and tempered steel for the continuous oil pipe, C is the most economical strengthening element, and the strength of the steel can be improved through interstitial solid solution strengthening by adding a proper amount of C into the steel. The improvement of the content of the C element in the steel can greatly improve the hardenability of the steel, reduce the addition of other noble alloys, further reduce the production cost and is beneficial to reducing the yield ratio of the steel, so that the content of the C element in the steel is not too low. However, it should be noted that the content of C element in the steel should not be too high, and when the content of C element in the steel is too high, the ductility, toughness and weldability of the steel are adversely affected. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the invention, the mass percent of the element C is controlled to be 0.18-0.32%.
Of course, in some preferred embodiments, the mass percentage of the C element may be controlled to be between 0.20 and 0.30% in order to obtain better implementation effects.
Si: in the low-cost quenched and tempered steel for continuous oil pipe according to the present invention, si is not only a solid-solution strengthening element but also a deoxidizing element in the steel. However, it should be noted that the content of Si element in steel should not be too high, and when the content of Si element in steel is too high, the welding performance of steel is deteriorated, and it is easy to remove scale produced in hot rolling process to affect the surface quality, and if the content of Si exceeds 0.30%, the toughness of steel may be reduced, and temper brittleness may be easily promoted. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of Si element is controlled to be 0.05 to 0.30%.
Of course, in some preferred embodiments, the mass percentage of the Si element may be controlled between 0.05 and 0.22% in order to obtain better implementation effects.
Mn: in the low-cost quenched and tempered steel for continuous oil pipe according to the present invention, mn element can improve the strength of the steel by solid solution strengthening, which is the most important and economical strengthening element in the steel to compensate for the loss of strength due to the decrease in C content. In addition, mn is an element that expands the γ phase region, which can lower the γ → α transformation temperature of steel, contribute to obtaining a fine transformation product, can improve toughness of steel, and also contribute to control of oxygen and sulfur in the steel making process. Therefore, in order to secure the advantageous effects of the Mn element to obtain a desired strength level, the Mn element content in the steel is preferably not less than 0.90%. However, when the content of Mn element in steel is increased, segregation tends to be severe and an embrittling component is easily formed during heat treatment, thereby decreasing fatigue life and corrosion resistance of the coiled tubing. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of the Mn element is controlled to be 0.90 to 2.50%.
Of course, in some preferred embodiments, the mass percentage of the Mn element may be controlled to be between 1.20 and 1.80% in order to obtain better implementation effects.
P, S: in the low-cost quenched and tempered steel for the continuous oil pipe, P and S are inevitable impurity elements in the steel, and when the content of the P element in the steel is too high, cold brittleness of the steel is easily caused; when the content of S in steel is too high, hot embrittlement is likely to occur, and the properties of steel are unstable, so that the contents of phosphorus and sulfur in steel should be reduced as much as possible, as technical conditions permit. Therefore, in the low-cost quenched and tempered steel for the continuous oil pipe, the mass percent of P is controlled to be less than or equal to 0.015 percent, and the mass percent of S is controlled to be less than or equal to 0.005 percent.
Cr: in the low-cost quenched and tempered steel for continuous oil pipe, cr element can improve the hardenability of the steel and has a certain solid solution strengthening effect. Therefore, when the mass percent of the Cr element in the steel is controlled to be 0.10% or more, the corrosion resistance of the steel can be effectively improved, and a compact protective layer can be formed on the surface of the steel to play a role in protecting a matrix. However, it should be noted that the content of Cr element in steel should not be too high, and when the content of Cr element in steel is too high, temper brittleness of steel is promoted, weld quality is not good, and a gray spot defect is easily formed. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of the Cr element is controlled to be 0.10 to 0.50%.
Ti: in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, ti is an effective element for a good deoxidizing and degassing agent and fixing nitrogen and carbon. The undissolved carbonitride of Ti can prevent austenite grains from growing when the steel is heated, tiN and TiC precipitated during the high-temperature austenite zone rough rolling can effectively inhibit the austenite grains from growing to refine the grains, and the precipitation can also inhibit the high-temperature grains from growing to improve the welding performance. In addition, the addition of a proper amount of Ti element in the steel is beneficial to weakening the temper brittleness of the steel. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of Ti element is controlled to be 0.008 to 0.025%.
Cu: in the low-cost quenched and tempered steel for a continuous oil pipe according to the present invention, an appropriate amount of Cu element may be added to the steel to improve the strength of the steel by a solid solution strengthening effect. In addition, the proper amount of Cu element added into the steel can also obviously improve the atmospheric corrosion resistance of the steel. However, it should be noted that the Cu content in the steel is not so high that the hot deformation workability of the steel is adversely affected when the Cu content in the steel is high. Based on this, in the low-cost quenched and tempered steel for continuous oil pipe according to the present invention, the mass percentage of the Cu element is controlled to be 0.10 to 0.40%.
Ni: in the low-cost quenched and tempered steel for a continuous oil pipe according to the present invention, an appropriate amount of Ni element may be added to the steel to improve the strength of the steel by a solid solution strengthening effect. The Ni element can effectively refine grains and improve the hot brittleness easily caused by the Cu element in the steel, and is very beneficial to the toughness of the steel. Based on this, in the low-cost quenched and tempered steel for continuous oil pipe according to the present invention, the mass percentage of Ni element is controlled to be 0.05 to 0.30%.
B: in the low-cost quenched and tempered steel for the continuous oil pipe, the B has the main function of increasing the hardenability of the steel, can effectively improve the performance of the material after quenching and tempering, and improves the uniformity of the performance in the thickness direction. In addition, a proper amount of B element is added into the steel to replace other noble metal elements to a certain extent, so that the production cost is reduced. However, it should be noted that the content of B element in steel is not so high, and when the content of B element in steel exceeds 0.005%, hardenability of steel tends to decrease, and B element tends to promote temper brittleness. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of the element B is controlled to be 0.002 to 0.005%.
Of course, in some preferred embodiments, the mass percentage of the B element may be controlled between 0.0025 and 0.0045% in order to obtain better implementation effect.
Ca: in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, ca treatment can be achieved by adding an appropriate amount of Ca element, and the form of sulfide can be controlled by Ca treatment, so that anisotropy of the steel sheet can be improved, and low-temperature toughness of the steel sheet can be improved. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of Ca element is controlled to be 0.001-0.004%.
Al: in the low-cost quenched and tempered steel for the continuous oil pipe, al is an element added into the steel for deoxidation, and the addition of a proper amount of Al is beneficial to refining grains and improving the toughness of the steel. However, it should be noted that the content of Al element in the steel is not excessively high, and when the content of Al element in the steel is more than 0.05%, coarse precipitates may be formed, thereby weakening the toughness of the steel. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipe of the present invention, the mass percentage of Al element is controlled to be 0.01 to 0.05%.
N: in the low-cost quenched and tempered steel for the continuous oil pipe, a proper amount of N element is added to form TiN particles with a high melting point, so that the effect of inhibiting coarsening of slab particles in a reheating process is achieved, and the toughness of the steel is improved. However, it should be noted that the content of N element in steel should not be too high, and when the content of N element in steel is too high, the yield strength of steel is obviously improved due to high-concentration free N atom pinning dislocation after aging, but the toughness of the material is also damaged. Based on the above, in the low-cost quenched and tempered steel for the continuous oil pipe, the mass percent of N element is controlled to be more than 0 and less than or equal to 0.007%.
Therefore, when the chemical composition design is carried out on the low-cost quenched and tempered steel for the coiled tubing, the components and the process design idea different from those of the conventional coiled tubing are adopted, and the strength and the toughness of the material are ensured by taking carbon and manganese reinforcement as main materials and taking Ti and other micro-alloys as auxiliary materials; the tempering brittleness and the tempering resistance are weakened through low Cr and Mo, so that the material has better toughness and low hardness after pipe making and final heat treatment; by adding a proper amount of B element to partially replace Cr and Mo, the steel is ensured to have good hardenability, the performance uniformity after heat treatment is improved, and the alloy cost is effectively reduced.
Further, in the low-cost quenched and tempered steel for continuous oil pipes, the mass percentages of the chemical elements are as follows: 75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15) is less than or equal to 22; and/or P (Si + Mn). Times.10 4 Less than or equal to 150, wherein each element in the formula represents a numerical value before the mass percentage content of the corresponding element.
Further, in the low-cost quenched and tempered steel for continuous oil pipes, the mass percentages of the chemical elements are as follows: 75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15) is less than or equal to 20; and/or P (Si + Mn). Times.10 4 Less than or equal to 130, wherein each element in the formula represents a numerical value before the percentage content of the corresponding element by mass.
In the above technical solution of the present invention, after the low-cost steel for a quenched and tempered continuous oil pipe according to the present invention is smelted, cast, and hot-rolled to obtain a hot-rolled steel strip, the hot-rolled steel strip may be subjected to pickling, pipe making, heat treatment, and coiling to obtain a corresponding steel pipe. Wherein, after the pipe is manufactured, in the subsequent heat treatment step, quenching and tempering treatment are needed, and the theoretical value of the hardness of the material after high-temperature tempering is HRC cal =75.5-0.094T +6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15), in order to make the material after quenching and tempering meet the hardness upper limit requirement of CT90, the inventionThe invention can further control the elements of C, mn, cr, mo, V, ni and Cu to meet the following requirements while controlling the mass percentage of a single chemical element: HRC cal (temperature T = 650) =75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15) ≦ 22; of course, in some preferred embodiments, it may be preferable to control the HRC cal (temperature T = 650) is less than or equal to 20. And substituting each chemical element in the above formula into the numerical value before the mass percentage content percentage of the chemical element.
It should be noted that, after heat treatment, the P element is likely to segregate in grain boundaries to reduce intergranular cohesion, and Mn and Si promote segregation of the P element to accelerate embrittlement. Therefore, the invention can preferably control the P, si and Mn elements in the steel to meet the following requirements while controlling the mass percentage of the single chemical element: p (Si + Mn). Times.10 4 150 or less, preferably P (Si + Mn). Times.10 4 130 or less to improve the toughness after heat treatment and reduce the stress corrosion sensitivity. And substituting each chemical element in the above formula into the numerical value before the mass percentage content percentage of the chemical element.
Further, the steel for a low-cost quenched and tempered continuous oil pipe according to the present invention further contains at least one of 0 < Nb < 0.02% and 0 < Mo < 0.02%.
Furthermore, in the low-cost quenched and tempered steel for the continuous oil pipe, nb is more than 0 and less than or equal to 0.015 percent.
In the technical scheme of the invention, a proper amount of Nb and/or Mo can be added into the low-cost quenched and tempered steel for continuous oil pipes, and the performance of the steel can be further improved by adding both the Nb and the Mo.
Nb: in the low-cost quenched and tempered steel for the continuous oil pipe, nb is one of important elements of low-carbon microalloyed steel, nb which is dissolved in the hot rolling process can be precipitated by strain induction to form carbonitride of Nb, pinning grain boundaries can inhibit the growth of deformed austenite, and the deformed austenite can be transformed into a fine product with high dislocation density through controlled rolling and controlled cooling. The solid-solution Nb is dispersed and precipitated in the matrix as second-phase particles NbC after the steel strip is coiled, and further plays a role in precipitation strengthening. It should be noted that, in the present invention, the content of Nb element in the steel should not be too high, nb is not used as a main strengthening element, and the addition of a large amount of Nb element in the steel increases the tempering resistance of the steel, and the slab is likely to crack, thereby affecting the surface quality, and the content of Nb element in the steel is too high, which deteriorates the weldability of the steel. Based on the above, in the low-cost quenched and tempered steel for the continuous oil pipe, the mass percent of Nb can be controlled to be more than 0 and less than or equal to 0.02 percent.
Of course, in some preferred embodiments, the mass percentage of Nb element can be controlled to be 0 < Nb 0.015% for better performance.
Mo: in the low-cost quenched and tempered steel for the continuous oil pipe, mo is a strong hardenability element, which can not only remarkably delay ferrite phase transformation, but also effectively inhibit the formation of ferrite and pearlite, and can play a role in promoting bainite transformation and strengthening a matrix, thereby obtaining a finer structure. In addition, mo can also overcome the temper brittleness in the heat treatment process, and further plays a role in improving the heat treatment performance and the fatigue performance. It should be noted that in high strength low alloy steel, the content of Mo element in the steel should not be too high, and as the content of Mo element in the steel increases, the plasticity of the steel decreases and the temper resistance increases. Based on the above, in the low-cost quenched and tempered steel for continuous oil pipes, the mass percent of Mo element can be controlled to be more than 0 and less than or equal to 0.02 percent.
Further, in the low-cost quenched and tempered steel for continuous oil pipe according to the present invention, the chemical elements thereof may satisfy at least one of the following contents by mass:
C：0.20-0.30％；
Si：0.05-0.22％；
Mn：1.20-1.80％；
B：0.0025-0.0045％；
Cu：0.10-0.30％；
Ni：0.05-0.25％。
accordingly, another object of the present invention is to provide a hot rolled steel strip made of a low-cost quenched and tempered steel for coiled tubing, which can be rolled in a wide process range to obtain a low-strength hot rolled steel strip for coiled tubing, and which has a low yield ratio and good plastic workability, so as to ensure smooth proceeding of a subsequent forming and welding process and effectively reduce equipment loss.
It should be noted that, unlike the prior art which pursues high-strength steel, the low-cost quenched and tempered steel for coiled tubing according to the present invention can be rolled in a wide process range to obtain a relatively low-cost quenched and tempered steel strip for coiled tubing, which can provide good processability and dimensional accuracy for the subsequent tube-making process, thereby ensuring smooth proceeding of the forming and welding process in the subsequent tube-making process and reducing equipment loss.
In order to achieve the above object, the present invention provides a hot-rolled steel strip produced from the above low-cost quenched and tempered steel for coiled tubing, the microstructure matrix of which is ferrite + pearlite + bainite.
Furthermore, the yield strength of the hot-rolled steel strip is 400-500MPa, the tensile strength is 550-650MPa, and the elongation is more than or equal to 24%.
Accordingly, it is still another object of the present invention to provide a steel pipe having ultra-high strength, which covers the most widely used CT90 and CT110 steel grades, up to CT130 steel grade, and which improves the uniformity of structural properties of the pipe body and the weld joint, and has excellent fatigue life and corrosion resistance, compared to the conventional TMCP-type coiled tubing.
In order to achieve the purpose, the invention provides a steel pipe made of the hot rolled steel strip, wherein the microstructure matrix of the steel pipe is tempered sorbite and bainite, and the phase proportion of the tempered sorbite is more than or equal to 65 percent.
Accordingly, the invention also aims to provide a method for manufacturing the hot rolled steel strip, the hot rolled steel strip manufactured by the method has the advantages of low strength, high elongation, good plate shape, surface quality and dimensional accuracy, good plasticity, toughness and processability, and can ensure the smooth proceeding of the subsequent pipe-making forming welding process and effectively reduce the equipment loss.
In order to achieve the above object, the present invention provides the above method for manufacturing a hot rolled steel strip, comprising the steps of:
(1) Smelting and continuous casting;
(2) Hot rolling: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; the coiling temperature is controlled to be 500-650 ℃.
In the manufacturing method of the hot rolled steel strip, in the step (1), the smelting process can be performed by conventional smelting methods such as electric furnace or converter smelting and the like, and the external refining can be performed in a mode of RH vacuum degassing and LF desulphurization so as to refine the molten steel, wherein the degassing time can be controlled to be more than or equal to 3min. Correspondingly, after smelting is finished, in the subsequent continuous casting step, the superheat degree of continuous casting can be controlled to be 10-25 ℃, and the sedation time is controlled to be more than or equal to 6min.
Further, in the step (2) of the method for manufacturing a hot-rolled steel strip according to the present invention, it is necessary to control the slab heating temperature to 1130 to 1280 ℃ and the slab soaking time coefficient to 1.5 to 2.0min/mm because: according to the invention, less Nb and Ti elements are added in the chemical composition design, and the contribution of the solid solution strengthening effect on the final strength of the steel strip is less, so that the plate blank can be heated at a lower heating temperature, the energy consumption cost of a heating furnace can be reduced, and the scale on the surface of the plate blank can be reduced, thereby reducing the scale on the surface of the hot-rolled steel strip and reducing the defects caused by residual scale in the subsequent processing. It should be noted, however, that the slab heating temperature should also not be too low to place a large load on the rolling mill.
Accordingly, in step (2) of the method for manufacturing a hot-rolled steel strip according to the present invention, it is necessary to control the finish rolling temperature to 800 to 920 ℃ because: when the finishing rolling temperature is too high and exceeds 920 ℃, austenite grains are coarsened obviously, a steel belt easily generates a serious banded structure or mixed crystal structure, and the plasticity and the processing performance of the material are adversely affected; if the finish rolling temperature is lower than 800 ℃, the finish rolling temperature of the edge of the steel strip may be lower than Ar3, and the properties of the edge structure are very easy to be abnormal.
Further, in the present invention, the coiling temperature is controlled to be 500 to 650 ℃ because: when the coiling temperature is lower than 500 ℃, the proportion of bainite and other hard phase structures in the structure is obviously increased, even partial martensite structures may appear, the strength level and the fluctuation range of the steel strip are obviously increased, the performance stability and the plate shape are poor, and the subsequent tube-making forming is not facilitated; if the coiling temperature exceeds 650 ℃, the strength is easy to be lower, a relatively serious banded structure is easy to generate, the mechanical property of the metal is anisotropic due to the presence of the banded structure, the direction of the banded structure is obviously superior to the vertical direction of the banded structure, and the metal is easy to break from a junction in the process of tube making and forming.
Further, in the method for manufacturing a hot-rolled steel strip according to the present invention, in the step (1), a degree of superheat of continuous casting is controlled to be 10 to 25 ℃, and/or a calm time is equal to or more than 6min.
Accordingly, another object of the present invention is to provide a method for manufacturing the above steel pipe, wherein the steel pipe manufactured by the method has ultra-high strength, the strength of the steel pipe covers the most widely used CT90 and CT110, and the highest strength can reach the CT130 steel grade, compared with the conventional TMCP-state coiled tubing, the uniformity of the structural properties of the pipe body and the weld joint is improved, and the steel pipe has excellent fatigue life and corrosion resistance.
In order to achieve the above object, the present invention provides the above method for manufacturing a steel pipe, comprising the steps of:
(1) Smelting and continuous casting;
(2) Hot rolling to obtain a hot rolled strip: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; controlling the coiling temperature to be 500-650 ℃;
(3) Acid washing;
(4) Manufacturing a pipe;
(5) Heat treatment, which comprises three steps of preheating, induction quenching and tempering, wherein in the step of induction quenching, the quenching temperature is controlled to be above Ac3 temperature, and the cooling speed is 30-80 ℃/s; wherein in the tempering step, the tempering temperature is controlled to be 500-650 ℃, and cooling is carried out after tempering;
(6) And (4) coiling.
In the technical scheme of the invention, in the manufacturing process of the steel pipe, the heat treatment process in the step (5) is optimized and improved, so that the steel pipe which has high strength and can meet the requirements of more deep wells and long horizontal sections for downhole operation can be obtained.
In the prior art, the structural properties of a welding seam and a pipe body of a conventional coiled tubing are greatly different, and the fatigue property of the welding seam is in a descending trend relative to the pipe body along with the increase of the strength, so that the welding seam becomes a bottleneck for limiting the overall performance of the high-strength coiled tubing. The conventional coiled tubing is usually subjected to simple stress relief annealing only after welding, but the manufacturing method of the steel tube provided by the invention has the advantages that the heat treatment process is optimized, and multiple heat treatment processes of the whole tube are adopted in the heat treatment step, so that the difference of the structure performance between a welding seam and a tube body can be greatly reduced, the adverse effect of the welding seam on the whole performance is reduced, the strength is improved, the good fatigue life and corrosion resistance are obtained, and the service life of the coiled tubing is prolonged.
According to the invention, through the heat treatment process of the whole pipe, the influence of the performance difference of the steel strip on the performance of the final coiled tubing finished product is reduced, the residual stress of the pipe body and the position of a welding line in the pipe manufacturing process is weakened, and the reliability of the coiled tubing is improved.
In step (3) of the method for producing a steel pipe according to the present invention, a steel strip having a good surface quality can be obtained by pickling. Wherein, in the acid washing step, the coiling temperature can be controlled to be less than or equal to 75 ℃, the acid washing temperature is controlled to be between 60 and 75 ℃, and the acid washing time is controlled to be 45 to 100s.
Correspondingly, in the step (4) of the steel pipe manufacturing method, the steel strip can be longitudinally cut into the width required by the continuous oil pipe in the pipe manufacturing stage, then the butt joint of the steel strip is completed along the length direction in an end welding mode, the straight welding seam welding can be completed by utilizing high-frequency induction welding after the welding steel strip is bent and formed by a forming unit, the required outer diameter size of the continuous pipe is obtained by sizing treatment, and the continuous oil pipe still keeps TMCP state tissues at the time.
In the step (5) of the steel pipe manufacturing method of the invention, in the heat treatment step, the whole pipe heat treatment of the coiled tubing comprises three steps of preheating, induction quenching and tempering. In the step of induction quenching, the pipe body can be heated to a temperature above Ac3 temperature (the final temperature of ferrite completely transformed into austenite during heating) through an induction heating furnace and is kept for a sufficient time, so that complete decomposition of ferrite or carbide is effectively ensured, and the whole pipe body is uniformly diathermized. And after heating, spraying and cooling, adjusting the pressure and the speed of water flow according to the size specification of the product and the ambient temperature, and controlling the cooling speed to be 30-80 ℃/s so as to ensure that the whole tube wall finishes tissue transformation in a short time.
Accordingly, in the tempering step of the present invention, the pipe body may be rapidly heated to 500 to 650 ℃ by the induction heating furnace to be tempered. This is because: too high a tempering temperature results in transformation of part of the martensite into high carbon austenite, which tends to transform into a brittle phase, thereby reducing the toughness and fatigue life of the pipe. On the other hand, if the tempering temperature is lower than 500 ℃, the dislocation quenched structure is not completely recovered, and the toughness and fatigue life of the pipe are also greatly reduced. Therefore, the tempering temperature needs to be controlled between 500 ℃ and 650 ℃.
In addition, in the step (6) of the method for manufacturing the steel pipe, a coiling operation is required, after the heat treatment step in the step (5), the steel pipe subjected to the heat treatment can be coiled on a reel through a coiling machine to obtain a finished coiled tubing product, and the final microstructure of the prepared finished coiled tubing product mainly comprises tempered sorbite and the balance bainite and other structures. The structure of the welding seam and the base metal position of the finished product continuous oil pipe is uniformly refined, and the finished product continuous oil pipe has higher strength and better plasticity and toughness.
Further, in the method for manufacturing a steel pipe according to the present invention, in the preheating step in the step (5), the pipe body is heated in three stages, the first stage is heated to 450 to 500 ℃, the second stage is heated to 650 to 700 ℃, and the third stage is heated to 800 to 850 ℃.
In the technical scheme, a preheating step is arranged before the induction quenching operation, the tube body can be heated in a three-stage mode through a preheating zone, the first stage is heated to 450-500 ℃, the second stage is heated to 650-700 ℃, and the third stage is heated to 800-850 ℃, so that the temperature distribution along the section of the tube body can be homogenized through the stage-type heating preheating, the size deformation problem can be reduced, relatively fine and uniform austenite grains can be obtained, and the austenitizing heating uniformity is improved.
Further, in the method for manufacturing a steel pipe according to the present invention, in the step (5), after the tempering is completed, the steel pipe is air-cooled to 150 ℃ or lower and then water-jet-cooled.
Compared with the prior art, the low-cost quenched and tempered steel for the continuous oil pipe, the hot rolled steel strip, the steel pipe and the manufacturing method thereof have the following advantages and beneficial effects:
the low-cost quenched and tempered coiled tubing steel disclosed by the invention is designed through a reasonable chemical component system, adopts a component design idea different from that of a conventional quenched and tempered coiled tubing, and effectively controls the alloy cost through the chemical component design mainly based on carbon and manganese reinforcement and assisted by multi-element microalloy.
Compared with the conventional components, the content of Mo and Cr elements is reduced in the design so as to reduce the hardness after tempering; correspondingly, the invention also ensures the hardenability of the material by adding a proper amount of B element; the invention ensures the corrosion resistance of the steel by adding proper amount of Cr, cu and Ni elements. In the low-cost quenched and tempered steel for the continuous oil pipe, the V element is not added in the steel, and the Nb and the Ti with lower contents are adopted, so that the production cost is reduced while the performance of the steel is ensured.
In addition, the invention also adopts a low-sulfur design to ensure that the developed steel has good impact toughness and fatigue resistance; the steel for the quenched and tempered continuous oil pipe is also controlled to be added with a low-content Si element so as to remove iron scales in the rolling process and further improve the surface quality.
By adopting the steel for the quenched and tempered continuous oil pipe and matching with the optimized process design, the steel can be rolled in a wider process range to obtain a hot rolled steel strip, and the prepared hot rolled steel strip has the advantages of lower strength, higher elongation, good plate shape, surface quality and dimensional precision, good plasticity, toughness and processability, can ensure the smooth proceeding of the subsequent pipe-making forming welding process, and effectively reduces the equipment loss.
In addition, the steel pipe of the invention can be further prepared by adopting the hot rolled steel strip of the invention, has ultrahigh strength, the strength of the steel pipe covers CT90 and CT110 which are most widely applied at present, the highest strength can reach CT130 steel grade, compared with the conventional TMCP-state continuous oil pipe, the uniformity of the structure performance of the pipe body and a welding seam is improved, and the steel pipe has excellent fatigue life and corrosion resistance.
Correspondingly, in the manufacturing method of the steel pipe, the steel pipe is subjected to online pipe arrangement heat treatment by adopting a special heat treatment process, the high-strength continuous oil pipe with adjustable performance can be obtained by adjusting the heat treatment process, the strength of the continuous oil pipe can meet the CT90 and CT110 steel grades and can reach the CT130 steel grade at the highest, the continuous oil pipe can be effectively applied to the operation fields of oil and gas field drilling, well repair, well completion and the like, and the requirements of downhole operation of more deep wells and long horizontal sections can be met.
It should be noted that according to the components and the process designed by the invention, the hot rolled steel strip with the same component can be matched with different heat treatment processes to manufacture the continuous oil pipes with different strength grades, thereby simplifying purchasing and stock preparation processes and improving the production management efficiency.
Detailed Description
The steel for low-cost quenched and tempered continuous oil pipe, the hot-rolled steel strip, the steel pipe and the method for manufacturing the same according to the present invention will be further explained and illustrated with reference to specific examples, but the explanation and the illustration do not unduly limit the technical aspects of the present invention.
Examples 1 to 6
Tables 1 to 1 and tables 1 to 2 show the mass percentages of the respective chemical elements in the low-cost heat-treated steel for continuous oil pipe of examples 1 to 6.
TABLE 1-1. (wt.%, balance Fe and other unavoidable impurities)
Tables 1-2.
| Numbering | 75.5-0.094×650+6.66(C+Mn/6+(Cr+Mo+V)/5+(Ni+Cu)/15) | P(Si+Mn)×10 4 |
| Example 1 | 19 | 80 |
| Example 2 | 19 | 56 |
| Example 3 | 18 | 113 |
| Example 4 | 19 | 83 |
| Example 5 | 18 | 141 |
| Example 6 | 17 | 53 |
Note: in the above table, "75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15)" and "P (Si + Mn). Times.10 + 4 Each element in the formula of' represents a numerical value before the percentage of the mass percent of the corresponding element.
The steels for low-cost heat-treated type continuous oil pipe according to examples 1 to 6 of the present invention can be manufactured into corresponding hot rolled steel strips, and examples 1 to 6 to 1 hereinafter show hot rolled steel strips manufactured using the steels for heat-treated type continuous oil pipe according to examples 1 to 6.
In the present invention, the hot rolled steel strips of examples 1-1 to 6-1 were all produced by the following steps:
(1) Smelting and continuous casting: in the smelting step, an electric furnace and a converter are adopted for smelting, and external refining is carried out for RH vacuum degassing and LF desulphurization, wherein the time for vacuum degassing is controlled to be more than or equal to 3min; in the continuous casting step, the superheat degree of continuous casting is controlled to be 10-25 ℃, and the sedation time is controlled to be more than or equal to 6min.
(2) Hot rolling: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; the coiling temperature is controlled to be 500-650 ℃.
It should be noted that, in the present invention, the chemical compositions and the relevant process parameters of the hot rolled steel strips of examples 1-1 to 6-1 all satisfy the design rule control requirements of the present invention.
Table 2 lists specific process parameters in the manufacturing methods of the hot rolled steel strips of examples 1-1 to 6-1.
Table 2.
The hot rolled steel strips of examples 1-1 to 6-1 thus obtained were sampled to obtain samples, and the yield strength, elongation and the like of the hot rolled steel strips of each example were measured to obtain test data for evaluating mechanical properties thereof, respectively, and the results of the measurement of the mechanical properties are shown in table 3 below.
Table 3 lists the relevant mechanical property parameters of the hot rolled steel strips of examples 1-1 to 6-1.
Table 3.
By observing the hot rolled steel strips of the embodiments, the hot rolled steel strips of the embodiments with ferrite, pearlite and bainite as microstructure matrixes can be obtained by the rolling process by adopting the design components of the invention. As can be seen from Table 2 and Table 3, the hot rolled steel strips of examples 1-1 to 6-1 all had a yield strength of 405 to 497MPa, a tensile strength of 560 to 650MPa, and an elongation of 24% or more. The hot rolled steel strips of each embodiment have low strength and high elongation, are good in plate shape, surface quality and dimensional accuracy, have good plasticity, toughness and processability, and are very beneficial to the subsequent pipe making process.
After the mechanical properties of the hot rolled steel strips of examples 1-1 to 6-1 were measured, the hot rolled steel strips of examples were reprocessed to produce steel pipes, respectively, and the steel pipes of examples thus produced were shown in examples 1-2 to 6-2, respectively.
In the present invention, the steel pipes of examples 1-2 to 6-2 were all produced by the following steps:
(1) Smelting and continuous casting: in the smelting step, an electric furnace and a converter are adopted for smelting, external refining is carried out for RH vacuum degassing and LF desulphurization, wherein the time of vacuum degassing is controlled to be more than or equal to 3min; wherein in the continuous casting step, the superheat degree of the continuous casting is controlled to be 10-25 ℃, and the sedation time is more than or equal to 6min.
(2) Hot rolling to obtain a hot rolled strip: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; the coiling temperature is controlled to be 500-650 ℃.
(3) Acid washing: controlling the coiling temperature to be 70 ℃, the pickling temperature to be 65 ℃, the pickling time to be 80s, and the thickness of the obtained steel strip to be less than or equal to 7mm;
(4) Pipe making: the method comprises the following steps of longitudinally cutting a steel belt into a width required by a quenched and tempered coiled tubing, completing butt joint of the steel belt along the length direction in an end welding mode, completing straight welding seam welding by utilizing high-frequency induction welding after the welded steel belt is bent and formed by a forming unit, and obtaining the required outer diameter size of a connecting pipe through sizing treatment, wherein the quenched and tempered coiled tubing still keeps TMCP state tissues at the moment.
(5) The heat treatment comprises three steps of preheating, induction quenching and tempering, wherein in the preheating step, the pipe body can be heated in three stages, the first stage is heated to 450-500 ℃, the second stage is heated to 650-700 ℃, and the third stage is heated to 800-850 ℃; wherein in the step of induction quenching, the quenching temperature is controlled to be higher than Ac3 temperature, and the cooling speed is 30-80 ℃/s; wherein in the tempering step, the tempering temperature is controlled to be 500-650 ℃, and after the tempering is finished, the water can be sprayed for cooling after the air is cooled to below 150 ℃;
(6) And (4) coiling.
It should be noted that the chemical compositions and related process parameters of the steel pipes of examples 1-2 to 6-2 all satisfy the design specification control requirements of the present invention, and the related process parameters of the steel pipes of examples 1-2 to 6-2 in step (1) and step (2) are completely the same as the process parameters listed in table 2.
In the invention, the steel strip needs to be pickled after the hot rolling operation is finished, in the pickling step of the step (3), the coiling temperature of each embodiment is controlled to be 70 ℃, the pickling temperature is controlled to be 65 ℃, the pickling time is controlled to be 80s, after the hot rolled steel strip is pickled and oiled, hot rolling oxide skin is removed, and the hot rolled pickled steel strip with good surface quality is obtained, the thickness of the hot rolled pickled steel strip is 3.96mm, the width of the hot rolled pickled steel strip is 1.2m, and the whole coil weight is more than or equal to 16 tons. Accordingly, in the tube making stage, the coiled tubing with the outer diameter of 38.1mm can be obtained through sizing treatment, and then the coiled tubing enters a heat treatment process.
Table 4 lists the specific process parameters in the above-described manufacturing method for the steel pipes of examples 1-2 to 6-2.
Table 4.
The prepared steel pipes of examples 1-2 to 6-2 were sampled, respectively, and the yield strength, elongation, and other relevant properties of the steel pipes of each example were measured, thereby obtaining test data for evaluating the mechanical properties thereof, respectively, which are listed in table 5.
Table 5 lists the relevant mechanical properties of the steel pipes of examples 1-2 to 6-2.
Table 5.
As can be seen by combining the mechanical properties of the hot rolled steel strips and steel pipes shown in tables 3 and 5, the properties of the hot rolled steel strips of example 1-1 and the hot rolled steel strips of example 3-1 after quenching and tempering at 650 ℃ can reach the CT90 grade; the hot rolled steel strip of example 4-1 and the hot rolled steel strip of example 6-1, after quenching and tempering at 580 ℃, could reach CT110 grade; the hot rolled steel strip of example 2-1 and the hot rolled steel strip of example 5-1, after quenching and 500 ℃ tempering, could reach CT130 grade.
Therefore, in the manufacture of the steel pipes of examples 1-2 to 6-2 according to the present invention, by controlling different heat treatment processes, the tensile properties and hardness of the steel pipes can meet the requirements of CT90-CT130 steel grade, the properties of the coiled tubing obtained by heat treatment at the same temperature after the steel strips with different strengths are made are similar, and the hardness difference among the base material, the weld joint and the heat affected zone is significantly small.
Therefore, according to the chemical composition design of the low-cost quenched and tempered steel for the continuous oil pipe, the low-strength hot-rolled steel strip with the yield strength of 400-500MPa, the tensile strength of 550-650MPa and the elongation rate of more than or equal to 24% can be effectively prepared by rolling in a wider process interval, and the low-strength hot-rolled steel strip is good in shape, surface quality and size precision, has good shaping, toughness and processing performance, and is beneficial to reducing the equipment loss in the pipe making process and improving the quality efficiency of forming welding.
Correspondingly, the prepared hot rolled steel strip is subjected to acid pickling, pipe making, forming and welding, and then is subjected to special online heat treatment, so that the structure uniformity of the continuous oil pipe can be effectively improved, the fatigue life and the corrosion resistance of the continuous oil pipe are improved, the high-strength continuous oil pipe with the structure mainly comprising tempered sorbite and bainite is finally obtained, and the performance of the continuous oil pipe can cover the CT90-CT130 steel grade through the adjustment of components and processes.
In conclusion, the low-cost quenching and tempering type coiled tubing has various advantages compared with the conventional coiled tubing by performing online heat treatment on the whole coiled tubing after tubing. On one hand, continuous oil pipe products with different steel grades can be obtained by adopting the same raw material and adjusting the heat treatment process, so that the purchasing and stock preparation processes are simplified, and the production management efficiency is improved. On the other hand, the steel grade CT90 and CT110 which are most widely applied at present can be replaced after the pipe is manufactured, the strength can reach the CT130 steel grade at most, and the requirements of downhole operation at different depths can be met.
In addition, in the manufacturing method of the steel pipe, the structural performance uniformity, the fatigue life and the corrosion resistance of the coiled tubing are improved, the reliability and the service life of the coiled tubing are improved, the failure risk is reduced and the working efficiency of an oil well is improved by optimally designing the heat treatment process. Therefore, the high-strength coiled tubing designed and manufactured by the technical scheme of the invention has the advantages of high strength, conforms to the development trend of the coiled tubing, can be effectively applied to the operation fields of oil and gas field drilling, well repair, well completion and the like, can meet the underground operation requirements of more deep wells and long horizontal sections, and has good market application prospect.
It should be noted that the combination of the features in the present application is not limited to the combination described in the claims of the present application or the combination described in the specific examples, and all the features described in the present application may be freely combined or combined in any manner unless contradicted by each other.
In addition, it should be noted that the above-mentioned embodiments are only specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiments and similar changes or modifications can be easily made by those skilled in the art from the disclosure of the present invention and shall fall within the scope of the present invention.
Claims (15)
1. A low-cost quenched and tempered steel for continuous oil pipe, which contains Fe and unavoidable impurities, characterized by further containing the following chemical elements in mass percent:
C：0.18-0.32％、Si：0.05-0.30％、Mn：0.90-2.50％、P≤0.015％、S≤0.005％、Cr：0.10-0.50％、Ti：0.008-0.025％、Cu：0.10-0.40％、Ni：0.05-0.30％、B：0.002-0.005％、Ca：0.001-0.004％、Al：0.01-0.05％、0＜N≤0.007％。
2. the steel for a low-cost quenched and tempered continuous oil pipe as claimed in claim 1, wherein the steel comprises the following chemical elements in percentage by mass:
c:0.18-0.32%, si:0.05 to 0.30%, mn:0.90-2.50%, P is less than or equal to 0.015%, S is less than or equal to 0.005%, cr:0.10-0.50%, ti:0.008-0.025%, cu:0.10-0.40%, ni:0.05-0.30, B:0.002-0.005%, ca:0.001-0.004%, al:0.01 to 0.05 percent of Fe, more than 0 and less than or equal to 0.007 percent of N, and the balance of Fe and other inevitable impurities.
3. The steel for a low-cost quenched and tempered continuous oil pipe as claimed in claim 1 or 2, wherein the steel has chemical elements in mass percent: 75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15) is less than or equal to 22; and/or P (Si + Mn). Times.10 4 Less than or equal to 150, wherein each element in the formula represents a numerical value before the mass percentage content of the corresponding element.
4. The low-cost quenched and tempered steel for continuous oil pipes as claimed in claim 3, wherein the steel comprises the following chemical elements in percentage by mass: 75.5-0.094 × 650+6.66 (C + Mn/6+ (Cr + Mo + V)/5 + (Ni + Cu)/15) is less than or equal to 20; and/or P (Si + Mn). Times.10 4 Less than or equal to 130, wherein each element in the formula represents the mass percent of the corresponding elementThe numerical value before the semicolon.
5. The steel for a low-cost heat-treated continuous oil pipe according to claim 1 or 2, further comprising at least one of 0 < Nb.ltoreq.0.02% and 0 < Mo.ltoreq.0.02%.
6. The steel for a low-cost heat-treated continuous oil pipe according to claim 5, wherein 0 < Nb.ltoreq.0.015%.
7. The steel for a low-cost quenched and tempered continuous oil pipe according to claim 1 or 2, wherein the steel has chemical elements in a mass percentage that satisfies at least one of the following:
C：0.20-0.30％；
Si：0.05-0.22％；
Mn：1.20-1.80％；
B：0.0025-0.0045％；
Cu：0.10-0.30％；
Ni：0.05-0.25％。
8. a hot-rolled steel strip produced using the low-cost quenched and tempered steel for coiled tubing according to any one of claims 1 to 7, characterized in that the microstructure matrix is ferrite + pearlite + bainite.
9. The hot rolled steel strip as claimed in claim 8 having a yield strength of 400 to 500MPa, a tensile strength of 550 to 650MPa and an elongation of 24% or more.
10. A steel pipe produced using the hot-rolled steel strip as claimed in any one of claims 8 or 9, characterized in that the microstructure matrix is tempered sorbite + bainite, wherein the phase proportion of the tempered sorbite is 65% or more.
11. A method of making hot rolled steel strip as claimed in claim 8 or claim 9 comprising the steps of:
(1) Smelting and continuous casting;
(2) Hot rolling: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; the coiling temperature is controlled to be 500-650 ℃.
12. The method of manufacturing a hot-rolled steel strip as claimed in claim 11, wherein in the step (1), the degree of superheat of the continuous casting is controlled to 10 to 25 ℃ and/or the calming time is 6min or more.
13. A method of manufacturing a steel pipe as defined in claim 10, comprising the steps of:
(1) Smelting and continuous casting;
(2) Hot rolling to obtain a hot rolled strip: controlling the heating temperature of the plate blank to be 1130-1280 ℃; the heat preservation time coefficient of the plate blank is 1.5-2.0min/mm; controlling the finishing temperature to be 800-920 ℃; controlling the coiling temperature to be 500-650 ℃;
(3) Acid washing;
(4) Manufacturing a pipe;
(5) Heat treatment, which comprises three steps of preheating, induction quenching and tempering, wherein in the step of induction quenching, the quenching temperature is controlled to be higher than Ac3 temperature, and the cooling speed is 30-80 ℃/s; wherein in the tempering step, the tempering temperature is controlled to be 500-650 ℃, and cooling is carried out after tempering;
(6) And (4) coiling.
14. The method of manufacturing a steel pipe as claimed in claim 13 wherein the preheating step in the step (5) is a three-stage heating of the pipe body, the first stage being heated to 450-500 ℃, the second stage being heated to 650-700 ℃, and the third stage being heated to 800-850 ℃.
15. The method of manufacturing a steel pipe as claimed in claim 13 or 14 wherein in step (5), after the tempering is completed, the steel pipe is air-cooled to 150 ℃ or less and then water-jet-cooled.
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