CN112522607A - Q125 steel grade SEW petroleum casing pipe and manufacturing method thereof - Google Patents
Q125 steel grade SEW petroleum casing pipe and manufacturing method thereof Download PDFInfo
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- 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
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- 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
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- 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
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- 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
Abstract
The invention discloses a Q125 steel grade SEW petroleum casing pipe and a manufacturing method thereof, relating to the technical field of petroleum casing pipes. The Q125 steel-grade SEW petroleum casing and the manufacturing method thereof control the consumption of precious alloys Mo, Cr and V, adopt proper production processes such as steel making, continuous casting, hot rolling, cooling, coiling and the like to obtain a hot-rolled coil with the initial yield strength of 400-plus 500MPa and the tensile strength of 600-plus 700MPa of a coil, have excellent initial welding performance of the coil, adopt an SEW pipe manufacturing process, and obtain the Q125-grade petroleum casing with the yield strength of 905-plus 950MPa, the tensile strength 990-plus 1100MPa, the transverse-10 ℃ Charpy impact power Akv of more than or equal to 80J and the elongation A50mm of not less than 18 percent through proper quenching and tempering treatment.
Description
Technical Field
The invention relates to the technical field of petroleum casings, in particular to a Q125 steel grade SEW petroleum casing and a manufacturing method thereof.
Background
The petroleum casing pipe is an important pipeline material in the petroleum and natural gas exploitation process and is an essential construction material in the exploitation process. Along with continuous exploitation of oil and gas resources, the exploitation environment and conditions are increasingly severe, and continuous exploitation of deep wells and ultra-deep wells (the well depth is more than 5000 m) puts higher requirements on the performance of petroleum casings. Therefore, the development of the petroleum casing pipe with high strength and high toughness is of great significance.
At present, a seamless steel pipe manufacturing process is mainly adopted for the high-strength petroleum casing pipe, a required strength grade is obtained in a quenching and tempering mode, more precious alloy elements such as Cr, Mo and V are generally added, and the raw material cost is increased; meanwhile, the seamless steel pipe is formed by perforation, the size precision of the pipe body is relatively poor, and the control precision limit of the wall thickness uniformity is +/-5%. The SEW petroleum casing pipe has the following advantages: firstly, the raw materials adopt a hot rolled coil of TMCP technology, so that the use amount of precious alloy is reduced, and the cost is reduced; secondly, the tolerance of the wall thickness of the hot rolled plate coil can be controlled within +/-1.5%; finally, counting; compared with the sleeve with the same specification and the same weight, the steel consumption of the ten-thousand-meter footage sleeve is reduced by 5-10 percent compared with the seamless steel pipe.
Patent CN 107502822B discloses a hot continuous rolling steel coil for high-extrusion-resistance SEW petroleum casing and a production method thereof, wherein the hot continuous rolling steel coil comprises the following chemical components: c: 0.22-0.32%, Si: 0.10-0.30%, Mn: 1.10-1.40%, Cr: 0.30-0.60%, P: less than or equal to 0.020%, S: less than or equal to 0.010 percent, Ti: 0.008-0.019%, the balance of Fe and inevitable impurities, the initial yield strength of the steel coil is 340-360MPa, the tensile strength is 620-640MPa, the yield strength of the steel coil tube after quenching and tempering is 840-910 MPa, the tensile strength is 940-1030 MPa, and the strength is still low, so that the use requirements of some ultra-deep wells cannot be met.
Patent CN 104561774 a discloses a P110-grade straight slit petroleum casing and its manufacturing method, wherein the chemical components are C: 0.24% -0.28%, Si: 0.15-0.30%, Mn: 1.25-1.50%, P is less than or equal to 0.020%, S is less than or equal to 0.008%, V: 0.05-0.08%, Ti: 0.010-0.30%, V is added in the steel, the strength of the petroleum casing is improved through precipitation strengthening of V, but the alloy cost is still high, meanwhile, the yield strength of the hot rolled steel coil is more than 570MPa, great difficulty is brought to subsequent welded pipes, the yield strength of the welded pipes is 780-850 MPa, and the tensile strength is 880-970 MPa.
Patent CN 102400065 a discloses a high-toughness ultrahigh-strength seamless steel tube for oil wells and a manufacturing method thereof, wherein the steel comprises the following chemical components in percentage by weight: c: 0.15% -0.27%, Si: less than or equal to 0.30 percent, Mn: 0.20% -0.50%, Cr: 0.85% -1.45%, Mo: 0.40% -1.2%, V: 0.08% -0.20%, Als: 0.01-0.05%, P is less than or equal to 0.012%, S is less than or equal to 0.005%, H is less than or equal to 0.00015%, N: less than or equal to 0.0050%, O: less than or equal to 0.0040 percent, less than or equal to 0.0080 percent of As + Sn + Pb + Sb + Bi, and the balance of Fe. According to the steel, the yield strength of the steel pipe is 980-1150MPa, the tensile strength of the steel pipe is 1040-1230MPa, and the high-strength steel for the oil well pipe is obtained, but the alloy cost is high.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a Q125 steel-grade SEW petroleum casing pipe and a manufacturing method thereof, which solves the problems that the conventional high-strength petroleum casing pipe mainly adopts a seamless steel pipe manufacturing process, adopts a quenching and tempering mode to obtain the required strength grade, generally adds more precious alloy elements such as Cr, Mo and V and the like, and increases the raw material cost; meanwhile, the seamless steel tube is formed by perforation, the dimensional accuracy of the tube body is relatively poor, and the control accuracy limit of the wall thickness uniformity is +/-5%; the SEW petroleum casing pipe has the following advantages: firstly, the raw materials adopt a hot rolled coil of TMCP technology, so that the use amount of precious alloy is reduced, and the cost is reduced; secondly, the tolerance of the wall thickness of the hot rolled plate coil can be controlled within +/-1.5%; finally, counting; compared with the sleeve with the same specification and the same weight, the steel consumption of the ten thousand meter footage sleeve is reduced by 5 to 10 percent compared with the seamless steel tube.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the Q125 steel grade SEW petroleum casing pipe and the manufacturing method thereof, the hot rolled steel coil comprises the following chemical components in percentage by weight: 0.15% -0.25%, Si: less than or equal to 0.30 percent, Mn: 1.00% -1.50%, P: less than or equal to 0.015%, S: less than or equal to 0.0050%, Mo: 0.10% -0.50%, V: 0.03 to 0.06%, Ti: 0.01-0.03%, Cr: 0.20-0.60%, Als: 0.020-0.035%, and the balance of Fe and inevitable impurities, and the specific operation is as follows:
s1, taking the continuous casting slab as a hot rolling blank according to the chemical component weight percentage content of the hot rolling steel coil, wherein during heating, the casting slab enters a heating furnace for heating, the tapping temperature of the casting slab is controlled at 1170-1210 ℃, and the thickness of the initial continuous casting slab is 230 mm;
s2, carrying out rough rolling on the two stands for 8 times, rolling in an austenite recrystallization region in the rough rolling stage, controlling the rolling starting temperature within the range of 1000-1060 ℃, and controlling the thickness of an intermediate blank to be 60mm to obtain the intermediate blank;
s3, carrying out seven-stand continuous rolling on the intermediate blank obtained in the step S2, wherein the accumulated deformation is more than or equal to 60%, increasing the deformation zone and dislocation density in the deformed austenite through accumulated large deformation, increasing the refined grains of the phase transformation nucleation points, and controlling the final rolling temperature at 830-870 ℃ to obtain a hot rolled coil with the thickness of 10-13 mm;
s4, after air cooling, the rolled steel plate is coiled, wherein the coiling temperature is 650-750 ℃.
Preferably, the initial yield strength of the hot continuous rolled plate coil is 400-500MPa, the tensile strength is 600-700MPa, and the initial yield strength is controlled below 500MPa, so as to obtain excellent initial welding performance and facilitate subsequent SEW welding forming; after the plate coil is subjected to SEW welding and quenching and tempering treatment, the yield strength is 905-950MPa, the tensile strength is 990-1100MPa, the Charpy impact power Akv at the transverse temperature of-10 ℃ is more than or equal to 80J, and the elongation A50mm is not less than 18%.
(III) advantageous effects
The invention provides a Q125 steel grade SEW petroleum casing pipe and a manufacturing method thereof. The method has the following beneficial effects: according to the Q125 steel-grade SEW petroleum casing pipe and the manufacturing method thereof, by controlling the use amounts of the precious alloys Mo, Cr and V and adopting appropriate production processes of steel making, continuous casting, hot rolling, cooling, coiling and the like, the hot-rolled coil with the initial yield strength of 400-700 MPa and the tensile strength of 600-700MPa is obtained, and the initial welding performance of the coil is excellent. The Q125-grade petroleum casing with the yield strength of 905-950MPa, the tensile strength 990-1100MPa, the Charpy impact power Akv of 80J or more at the transverse temperature of-10 ℃ and the elongation A50mm of not less than 18 percent is obtained by adopting an SEW pipe manufacturing process and proper quenching and tempering.
Drawings
FIG. 1 is a schematic representation of the metallographic structure (hot rolled state) of an example of the invention;
FIG. 2 is a schematic view of a metallographic structure (quenched and tempered state) according to an embodiment of the present invention;
FIG. 3 is a chemical composition diagram of various embodiments of the present invention;
FIG. 4 is a schematic diagram of the main process parameters and mechanical properties of the rolling process of the present invention;
FIG. 5 is a schematic diagram of the quenching and tempering process and mechanical properties of the pipe according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the present invention provides a technical solution: the Q125 steel grade SEW petroleum casing pipe and the manufacturing method thereof, the hot rolled steel coil comprises the following chemical components in percentage by weight: 0.15% -0.25%, Si: less than or equal to 0.30 percent, Mn: 1.00% -1.50%, P: less than or equal to 0.015%, S: less than or equal to 0.0050%, Mo: 0.10% -0.50%, V: 0.03 to 0.06%, Ti: 0.01-0.03%, Cr: 0.20-0.60%, Als: 0.020-0.035%, and the balance of Fe and inevitable impurities, and the specific operation is as follows:
s1, taking the continuous casting slab as a hot rolling blank according to the chemical component weight percentage content of the hot rolling steel coil, wherein during heating, the casting slab enters a heating furnace for heating, the tapping temperature of the casting slab is controlled at 1170-1210 ℃, and the thickness of the initial continuous casting slab is 230 mm;
s2, carrying out rough rolling on the two stands for 8 times, rolling in an austenite recrystallization region in the rough rolling stage, controlling the rolling starting temperature within the range of 1000-1060 ℃, and controlling the thickness of an intermediate blank to be 60mm to obtain the intermediate blank;
s3, carrying out seven-stand continuous rolling on the intermediate blank obtained in the step S2, wherein the accumulated deformation is more than or equal to 60%, increasing the deformation zone and dislocation density in the deformed austenite through accumulated large deformation, increasing the refined grains of the phase transformation nucleation points, and controlling the final rolling temperature at 830-870 ℃ to obtain a hot rolled coil with the thickness of 10-13 mm;
s4, after air cooling, the rolled steel plate is coiled, wherein the coiling temperature is 650-750 ℃.
Wherein the initial yield strength of the hot continuous rolled plate coil is 400-500MPa, the tensile strength is 600-700MPa, and the initial yield strength is controlled below 500MPa, so as to obtain excellent initial welding performance and facilitate subsequent SEW welding forming; after the plate coil is subjected to SEW welding and quenching and tempering treatment, the yield strength is 905-950MPa, the tensile strength is 990-1100MPa, the Charpy impact power Akv at the transverse temperature of-10 ℃ is more than or equal to 80J, and the elongation A50mm is not less than 18%.
The reasonable component design of the invention is the primary basis for obtaining the product:
1) c: the C element mainly improves the hardenability, the carbide formed by the C element and other alloy elements in the steel can improve the strength, the hardenability and the strength of the steel are difficult to ensure, but the C element can play a destructive role on the toughness of the steel, and the C element is higher than 0.25 percent, so the toughness is difficult to ensure, so the C content is controlled to be 0.15 to 0.25 percent.
2) Si: silicon mainly plays a role of deoxidation here, but is limited to 0.3% or less because it greatly impairs toughness.
3) Mn: manganese can improve hardenability, is combined with S element in steel to form MnS, can avoid the hot brittleness of the steel, can expand the austenite area of the steel, can refine crystal grains, and plays a role in improving the strength and toughness of the steel, the effect is not obvious when the content is lower than 1.0 percent, and when the content is higher than 1.5 percent, the effect of promoting harmful elements to be gathered in a grain boundary begins to be obvious, the toughness of the ultrahigh-strength oil well pipe steel is reduced, and the steel is easy to generate hydrogen sulfide stress corrosion, so the Mn is controlled to be 1.00 to 1.50 percent.
4) Cr: chromium improves hardenability, improves the strength and toughness of steel, has corrosion resistance, is a strong precipitate forming element, and can enlarge a heat treatment process window during subsequent heat treatment to form precipitates, thereby obviously improving the strength of steel. For the purpose of the present invention, Cr is more preferably in the range of 0.20% to 0.60%.
5) Mo: the stability of austenite is improved, and the stability of a heat treatment control process is improved (a heat treatment process window is enlarged) in the subsequent heat treatment process; the strength of the steel is improved by separating out V and Ti, Mo has obvious refining effect on the separated out phase, and can inhibit the curing and growth of the separated out phase, but the cost of the Mo alloy is higher, so the more preferable range of the invention is 0.10-0.50%.
6) V: vanadium forms C, N compounds, has the functions of refining crystal grains and improving strength, and can improve the obdurability of steel. For the purposes of the present invention, V is more preferably in the range of 0.03% to 0.06%.
7) P, S is a harmful impurity element in steel, and is preferable because it induces segregation and increases the brittleness of the material.
In the design of the hot rolling process, the tapping temperature of the initial continuous casting plate blank is 1170-1210 ℃, and the main purpose is to ensure that the material is completely austenitized and alloy elements are fully dissolved. And then two-stage rolling is adopted, wherein the first stage is recrystallization zone rolling, the rolling temperature is controlled to be within 1000-plus 1060 ℃, austenite grains are obviously refined through repeated deformation and recrystallization, the second stage is non-recrystallization zone rolling, the rolling temperature is controlled to be within 900-plus 1000 ℃, deformation and phase transformation are simultaneously carried out, the austenite grains are elongated in the stage, a slip zone is generated simultaneously, and favorable conditions are provided for ferrite nucleation due to the increase of austenite grain boundaries and the occurrence of the slip zone, so that fine-grained ferrite is obtained. In order to ensure that the coiled sheet has excellent initial welding performance, the coiled sheet is subjected to air cooling after rolling, the air cooling finishing temperature is 650-750 ℃, and coiling is carried out at the temperature. As shown in fig. 1, the structure of the high-strength and high-toughness SEW oil casing steel according to the present invention is formed after cooling.
The whole pipe quenching and tempering heat treatment process comprises the following steps: after the hot rolled coil passes through ERW pipe making, the whole pipe is heated to 850-; then heating the whole tube to 650 ℃ at 500 ℃ and keeping the temperature for 60-90min, and cooling in air. The yield strength of the whole tube after the quenching and tempering treatment is 905-950MPa, the tensile strength 990-1100MPa, the transverse-10 ℃ Charpy impact power Akv is more than or equal to 80J, and the elongation A50mm is not less than 18 percent.
Example (b):
the steel structure for the high-strength and high-toughness SEW petroleum casing pipe produced by the method is ferrite and pearlite structures, the yield strength of the steel strip is 400-500MPa, the tensile strength is 600-700MPa, and the elongation A50mm is 30-35%; the yield strength of the whole tube after the quenching and tempering treatment is 905-950MPa, the tensile strength 990-1100MPa, the Charpy impact power Akv at the transverse temperature of-10 ℃ is more than or equal to 80J, and the elongation A50mm is not less than 18 percent.
The high-strength and high-toughness SEW oil casing steel structure produced by the method is ferrite, pearlite and a small amount of bainite structure, the grain size grade is 8.0-10.0, the metallographic structure of a hot-rolled plate coil of an embodiment of the invention is shown in figure 1, and the metallographic structure after quenching and tempering of an embodiment of the invention is shown in figure 2.
The technical solution of the present invention is further illustrated by the following specific examples.
According to the chemical composition requirements provided by the invention, molten iron pretreatment → converter steelmaking → an alloy fine-tuning station → LF external refining → RH external refining → continuous casting → hot rolling are adopted. The chemical components of the tundish molten steel meet the following weight percentage (wt%): c: 0.15% -0.25%, Si: 0.20% -0.30%, Mn: 1.00% -1.50%, P: less than or equal to 0.015%, S: less than or equal to 0.0050%, Mo: 0.10% -0.50%, V: 0.03 to 0.06%, Ti: 0.01-0.03%, Cr: 0.20-0.60%; and Als: 0.020-0.035%; the balance of Fe and inevitable impurities. And carrying out protective casting in the whole continuous casting process.
The chemical composition of each embodiment of the invention is shown in fig. 3. The component detection is carried out according to GB/T4336 atomic emission spectrometry (conventional method) for spark sources of carbon steel and medium and low alloy steel.
In the rolling process, the slab is heated to 1170 ℃ - → 1210 → high-pressure water descaling → 2-stand rough rolling → 7-stand finish rolling → air cooling → coiling, and the main rolling process parameters and the tensile mechanical properties of the test steel are shown in fig. 4.
The quenching and tempering process and the mechanical properties of the pipe in the embodiment of the invention are shown in fig. 5.
In conclusion, the properties of the steel of the embodiment obtained according to the design range of the chemical components of the steel grade and the rolling process control technology are as follows: the yield strength of the steel strip is 400-500MPa, the tensile strength is 600-700MPa, and the elongation A50mm is 30-35%; after the quenching and tempering treatment, the yield strength of the whole tube is 905-950MPa, the tensile strength 990-1100MPa, the transverse-10 ℃ Charpy impact power Akv is not less than 80J, and the elongation A50mm is not less than 18 percent.
In conclusion, the Q125 steel-grade SEW petroleum casing pipe and the manufacturing method thereof have the advantages that by controlling the use amounts of the precious alloys Mo, Cr and V and adopting appropriate production processes such as steel making, continuous casting, hot rolling, cooling, coiling and the like, the hot rolled coil with the initial yield strength of 400-700 MPa and the tensile strength of 600-700MPa is obtained, and the initial welding performance of the coil is excellent. The Q125-grade petroleum casing with the yield strength of 905-950MPa, the tensile strength 990-1100MPa, the Charpy impact power Akv of 80J or more at the transverse temperature of-10 ℃ and the elongation A50mm of not less than 18 percent is obtained by adopting an SEW pipe manufacturing process and proper quenching and tempering.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (2)
1. A Q125 steel grade SEW petroleum casing and its manufacturing method, characterized by that: the hot rolled steel coil comprises the following chemical components in percentage by weight: 0.15% -0.25%, Si: less than or equal to 0.30 percent, Mn: 1.00% -1.50%, P: less than or equal to 0.015%, S: less than or equal to 0.0050%, Mo: 0.10% -0.50%, V: 0.03 to 0.06%, Ti: 0.01-0.03%, Cr: 0.20-0.60%, Als: 0.020-0.035%, and the balance of Fe and inevitable impurities, and the specific operation is as follows:
s1, taking the continuous casting slab as a hot rolling blank according to the chemical component weight percentage content of the hot rolling steel coil, wherein during heating, the casting slab enters a heating furnace for heating, the tapping temperature of the casting slab is controlled at 1170-1210 ℃, and the thickness of the initial continuous casting slab is 230 mm;
s2, carrying out rough rolling on the two stands for 8 times, rolling in an austenite recrystallization region in the rough rolling stage, controlling the rolling starting temperature within the range of 1000-1060 ℃, and controlling the thickness of an intermediate blank to be 60mm to obtain the intermediate blank;
s3, carrying out seven-stand continuous rolling on the intermediate blank obtained in the step S2, wherein the accumulated deformation is more than or equal to 60%, increasing the deformation zone and dislocation density in the deformed austenite through accumulated large deformation, increasing the refined grains of the phase transformation nucleation points, and controlling the final rolling temperature at 830-870 ℃ to obtain a hot rolled coil with the thickness of 10-13 mm;
s4, after air cooling, the rolled steel plate is coiled, wherein the coiling temperature is 650-750 ℃.
2. The Q125 steel grade SEW petroleum casing and the manufacturing method thereof according to claim 1, wherein the steel grade SEW petroleum casing comprises the following components: the initial yield strength of the hot continuous rolled plate coil is 400-500MPa, the tensile strength is 600-700MPa, and the initial yield strength is controlled below 500MPa, so that the initial welding performance is excellent, and the subsequent SEW welding forming is facilitated; after the plate coil is subjected to SEW welding and quenching and tempering treatment, the yield strength is 905-950MPa, the tensile strength is 990-1100MPa, the Charpy impact power Akv at the transverse temperature of-10 ℃ is more than or equal to 80J, and the elongation A50mm is not less than 18%.
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