CN113481434A - Thick-wall super 13Cr seamless steel pipe with yield strength of 125 steel grade and production method thereof - Google Patents
Thick-wall super 13Cr seamless steel pipe with yield strength of 125 steel grade and production method thereof Download PDFInfo
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- CN113481434A CN113481434A CN202110685367.1A CN202110685367A CN113481434A CN 113481434 A CN113481434 A CN 113481434A CN 202110685367 A CN202110685367 A CN 202110685367A CN 113481434 A CN113481434 A CN 113481434A
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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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- 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
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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
- C21D8/10—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
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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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
- C22C38/40—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
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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
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/70—Combining sequestration of CO2 and exploitation of hydrocarbons by injecting CO2 or carbonated water in oil wells
Abstract
The invention relates to a thick-wall super 13Cr seamless steel tube with 125 steel grade yield strength and a production method thereof, wherein the seamless steel tube has the following properties: the tensile strength is greater than or equal to 896MPa, the Rp0.2 yield strength is 862-1034 MPa, and the elongation is greater than or equal to 12%. The production method of the seamless steel tube comprises the following steps: the method comprises the steps of producing a super 13Cr casting blank by electric furnace smelting and continuous casting; casting blank annealing is performed, and the hardness is reduced; processing the blank, removing surface oxide skin, center porosity and cracks; fourthly, heating to 1150-1220 ℃ through electromagnetic induction, and performing hot extrusion molding; fifthly, preheating, heating the steel pipe to 960-1010 ℃, and cooling to room temperature by blowing; sixthly, heating to 960-1010 ℃, rapidly cooling quenching oil, heating to 560-610 ℃, and tempering to obtain the super 13Cr steel pipe with the steel grade performance of 125. The invention improves the yield and quality of the seamless steel pipe and reduces the production cost. The seamless steel pipe has good surface quality, high mechanical property of oil quenching heat treatment, higher strength and good toughness.
Description
Technical Field
The invention belongs to the field of industrial equipment production, and particularly relates to a thick-wall super 13Cr seamless steel tube with a yield strength of 125 steel grade and a production method thereof.
Background
With the gradual depletion of shallow wells and easily developed oil fields in the world and the increasing demand for energy in various countries, people are forced to turn to exploiting carbon dioxide-containing corroded oil fields with more severe geological conditions. The L80-13Cr is steel for petroleum exploitation, has good carbon dioxide corrosion resistance and low cost, is a corrosion-resistant alloy, and is widely applied to L80-13Cr seamless steel tubes in oil field exploitation.
As the depth of an oil well increases, geological conditions become complex, and the common low-steel grade L80-13Cr is difficult to bear the pressure generated by complex geology, so that the material is required to have higher strength performance and good impact toughness. Under the condition that the material composition is not changed, the L80-13Cr can be tempered to 125ksi steel grade by reducing the tempering temperature or the tempering time, but the plasticity and the toughness of the composition are greatly reduced, the brittleness is extremely high, and the composition is easy to crack and cannot be used. Therefore, the technology is important to fundamentally optimize components, research the chemical components and the production process of the 125Ksi steel grade with higher strength by combining the factors influencing the strength, the impact toughness and the corrosion resistance, and realize the steel with higher impact energy and carbon dioxide corrosion performance under the high-strength condition.
Disclosure of Invention
The invention aims to provide a thick-wall super 13Cr seamless steel pipe with the yield strength of 125 steel grade, which has higher strength and good toughness and is used for the exploitation process of oil fields containing carbon dioxide. The invention also aims to provide a production method of the thick-wall super 13Cr seamless steel pipe with the yield strength of 125 steel grade.
The technical scheme of the invention is as follows: the thick-wall super 13Cr seamless steel pipe with the yield strength of 125 steel grade comprises the following components in percentage by mass: c: less than or equal to 0.04, Si: 0.30 to 0.50, Mn: 0.40-0.60, P: less than or equal to 0.016 and S: less than or equal to 0.005, Cr: 12.7 to 13.5, Ni: 5.0-6.0, Mo: 1.5-3.0, Ti: 0.03 to 0.10, Nb: 0.01-0.06, V: 0.05 to 0.15, Al: 0.01-0.08, Ca: 0.0005-0.008, N: 0.008 to 0.025, Cu: less than or equal to 0.25, O: less than or equal to 0.0035 and H: less than or equal to 0.0004, and the balance of Fe and inevitable impurities.
The diameter of the outer circle of the seamless steel tube is phi 100-phi 325mm, and the wall thickness is 15-55 mm. The seamless steel pipe has the following properties: the tensile strength is greater than or equal to 896MPa, the Rp0.2 yield strength is 862-1034 MPa, the elongation is greater than or equal to 12%, and the hardness is less than or equal to 34 HRC. The full-size impact energy of the transverse Charpy V-shaped notch of the seamless steel pipe at-10 ℃ is more than or equal to 60J.
The invention relates to a production method of a thick-wall super 13Cr seamless steel tube with 125 steel grade yield strength, which comprises the following steps:
the method comprises the steps of smelting a blank, and producing a super 13Cr casting blank through an electric furnace smelting and continuous casting process;
annealing the blank, and annealing the casting blank obtained in the step to reduce the hardness of the casting blank;
processing the single edge of the outer circle of the casting blank obtained in the step II by 5-15 mm, processing the diameter of a central hole by 40-100 mm, and removing surface oxide skin, central porosity and cracks;
carrying out reaming and extrusion forming, uniformly heating the processed casting blank to 1150-1220 ℃ by using an electromagnetic induction furnace, and carrying out hot extrusion forming through reaming and extrusion to obtain a steel pipe with a finished size;
fifthly, preheating, uniformly heating the steel pipe to 960-1010 ℃, heating for 5-10 min/mm, and cooling to normal temperature by blowing;
sixthly, performing thermal refining, namely uniformly heating the steel pipe to 960-1010 ℃, then performing quick cooling by using quenching oil, cooling the steel pipe to 40-50 ℃, and then uniformly heating to 560-610 ℃ for tempering treatment to obtain a 125 steel grade super 13Cr steel pipe.
The method comprises the steps of smelting a blank: smelting molten steel in an electric furnace, feeding the molten steel into an LF furnace for refining, feeding an Al wire, carrying out vacuum treatment in a VD furnace when the temperature of the molten steel is 1600-1670 ℃, keeping the vacuum for 20-40 min, wherein the vacuum degree is 25-65 Pa, and adding an Si-Ca wire before vacuum. The molten steel is continuously cast into a round tube blank at the temperature of 1500-1580 ℃. The annealing temperature of blank annealing is 750-850 ℃, the heat is preserved for 12-24 h, and the blank is cooled to 450 ℃ along with the furnace. And step four, in a reaming and extrusion forming stage, uniformly heating to 1150-1220 ℃ by using an electromagnetic induction furnace, firstly carrying out high-pressure water descaling, and then lubricating the inner surface and the outer surface by using glass powder. And (3) reaming by adopting a 2500T vertical reamer, and then carrying out hot extrusion molding by adopting a 6300T horizontal extruder, wherein the extrusion speed is 200-350 mm/s, and the extrusion ratio is 5-15.
Sixthly, performing a quenching and tempering treatment stage, uniformly heating the steel pipe to 960-1010 ℃, preserving heat for 4-8 min/mm, and then performing quick cooling by using quenching oil. And (3) cooling the steel pipe to 40-50 ℃, uniformly heating to 560-610 ℃, preserving the heat for 6-15 min/mm, and tempering to obtain the 125 steel grade super 13Cr steel pipe.
According to the invention, the casting blank, hot extrusion molding and oil quenching heat treatment are combined to produce the thick-wall super 13Cr seamless steel tube with the yield strength of 125 steel grade, so that the problems of long process, low yield and poor performance of the prior art are solved, the forging process is omitted, the loss of a riser is reduced, the yield and the quality of the 125 steel grade super 13Cr thick-wall seamless steel tube are improved, and the production cost is reduced. The seamless steel pipe produced by the invention has good surface quality, high mechanical property after oil quenching heat treatment, higher strength and good toughness, and is widely applied to the exploitation process of oil fields containing carbon dioxide.
Detailed Description
The present invention will be described in detail with reference to examples. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
The thick-wall super 13Cr seamless steel pipe with the yield strength of 125 steel grade has the production specification of phi 133mm multiplied by 35mm in wall thickness, and the chemical components are shown in the following table 1:
TABLE 1 test data of the composition of phi 133mm x 35mm super 13Cr seamless steel pipe/(mass percent)
The production process of the thick-wall super 13Cr seamless steel pipe with the yield strength of 125 steel grade comprises the following steps:
the method comprises the steps of smelting a blank, and producing a super 13Cr casting blank through an electric furnace smelting and continuous casting process; the specification of the casting blank is phi 315mm multiplied by 900mm long, and the super 13Cr casting blank is prepared by adopting the electric furnace, external refining, vacuum degassing and continuous casting process. Smelting molten steel in an electric furnace, feeding the molten steel into an LF furnace for refining, feeding an Al wire, carrying out vacuum treatment in a VD furnace when the temperature of the molten steel is 1600-1670 ℃, keeping the vacuum for 20-40 min, wherein the vacuum degree is 25-65 Pa, and adding an Si-Ca wire before vacuum. The purity of steel is ensured by adopting the smelting mode, and the steel liquid is continuously cast into a round pipe blank when the temperature of the steel liquid is 1500-1580 ℃.
And annealing the blank, and annealing the casting blank obtained in the step to reduce the hardness of the casting blank. The annealing temperature is 780 ℃, the heat preservation is carried out for 12 hours, and the temperature is cooled to 400-450 ℃ along with the furnace.
Processing the blank, processing the single edge of the outer circle of the casting blank to 300mm, processing the diameter of the central hole to be 50mm, and removing surface oxide skin, central porosity and cracks.
And fourthly, reaming and extrusion forming, uniformly heating the processed casting blank to 1150-1200 ℃ by using an electromagnetic induction furnace, carrying out high-pressure water descaling, and then lubricating the inner surface and the outer surface by using glass powder. Medium-alkali powder is used for internal lubrication, 844-7 for external lubrication and medium-alkali powder is used for glass mat powder. Carrying out reaming molding by adopting a 2500T vertical reamer, then carrying out hot extrusion by adopting a 6300T horizontal extruder, wherein the inner diameter of an extrusion cylinder is 315mm, the inner diameter of an extrusion die is 135mm, a core rod is 63.5mm, the extrusion ratio is 6.58, the extrusion speed is 200-350 mm/s, and a steel pipe with phi 133mm and thickness of 35mm is extruded.
Fifthly, preheating treatment is carried out, the steel pipe is uniformly heated to 960-1000 ℃, the heating time is 5-10 min/mm, and blowing cooling is carried out until the temperature is normal.
Sixthly, performing thermal refining, namely uniformly heating the steel pipe to 980-100 ℃, then performing quick cooling by using quenching oil, cooling the steel pipe to 40-50 ℃, and then uniformly heating to 580 ℃ for tempering treatment to obtain the 125-grade super 13Cr steel pipe.
And (3) detecting the performance of the produced thick-walled super 13Cr seamless steel pipe with the yield strength of 125 steel grades, wherein the detection data are shown in a table 2.
TABLE 2.125 test results of the performance of super 13Cr seamless steel pipes of steel grade
Claims (8)
1. The utility model provides a thick wall super 13Cr seamless steel pipe of 125 steel grades of yield strength, characterized by: the steel for the seamless steel pipe comprises the following components in percentage by mass: c: less than or equal to 0.04, Si: 0.30 to 0.50, Mn: 0.40-0.60, P: less than or equal to 0.016 and S: less than or equal to 0.005, Cr: 12.7 to 13.5, Ni: 5.0-6.0, Mo: 1.5-3.0, Ti: 0.03 to 0.10, Nb: 0.01-0.06, V: 0.05 to 0.15, Al: 0.01-0.08, Ca: 0.0005-0.008, N: 0.008 to 0.025, Cu: less than or equal to 0.25, O: less than or equal to 0.0035 and H: less than or equal to 0.0004, and the balance of Fe and inevitable impurities.
2. The thick-walled super 13Cr seamless steel tube of 125 grade yield strength as claimed in claim 1, wherein: the diameter of the outer circle of the seamless steel pipe is phi 100-phi 325 mm; the wall thickness is 15 mm-55 mm.
3. The thick-walled super 13Cr seamless steel tube of 125 grade yield strength as claimed in claim 1, wherein: the seamless steel pipe has the following properties: the tensile strength is more than or equal to 896MPa, the Rp0.2 yield strength is 862-1034 MPa, the elongation is more than or equal to 12%, and the hardness is less than or equal to 34 HRC; the full-size impact energy of the transverse Charpy V-shaped notch of the seamless steel pipe at the temperature of-10 ℃ is more than or equal to 60J.
4. The method for producing thick-walled super 13Cr seamless steel pipe with 125 grade yield strength as claimed in claim 1, wherein the method comprises the following steps: the production method comprises the following steps:
the method comprises the steps of smelting a blank, and producing a super 13Cr casting blank through an electric furnace smelting and continuous casting process;
annealing the blank, and annealing the casting blank obtained in the step to reduce the hardness of the casting blank;
processing the single edge of the outer circle of the casting blank obtained in the step II by 5-15 mm, processing the diameter of a central hole by 40-100 mm, and removing surface oxide skin, central porosity and cracks;
carrying out reaming and extrusion forming, uniformly heating the processed casting blank to 1150-1220 ℃ by using an electromagnetic induction furnace, and carrying out hot extrusion forming through reaming and extrusion to obtain a steel pipe with a finished size;
fifthly, preheating, uniformly heating the steel pipe to 960-1010 ℃, heating for 5-10 min/mm, and cooling to normal temperature by blowing;
sixthly, performing thermal refining, namely uniformly heating the steel pipe to 960-1010 ℃, then performing quick cooling by using quenching oil, cooling the steel pipe to 40-50 ℃, and then uniformly heating to 560-610 ℃ for tempering treatment to obtain a 125 steel grade super 13Cr steel pipe.
5. The method for producing thick-walled super 13Cr seamless steel pipe with 125 steel grade yield strength as claimed in claim 4, wherein: smelting molten steel by an electric furnace, sending the molten steel into an LF furnace for refining, feeding an Al wire, performing vacuum treatment by a VD furnace when the temperature of the molten steel is 1600-1670 ℃, wherein the vacuum degree is 25-65 Pa, adding a Si-Ca wire before vacuum, and keeping the vacuum for 20-40 min; the molten steel is continuously cast into a round tube blank at the temperature of 1500-1580 ℃.
6. The method for producing thick-walled super 13Cr seamless steel pipe with 125 steel grade yield strength as claimed in claim 4, wherein: the annealing temperature of blank annealing is 750-850 ℃, the heat is preserved for 12-24 h, and the blank is cooled to 400-450 ℃ along with the furnace.
7. The method for producing thick-walled super 13Cr seamless steel pipe with 125 steel grade yield strength as claimed in claim 4, wherein: step four, in a reaming and extrusion forming stage, uniformly heating to 1150-1220 ℃ by using an electromagnetic induction furnace, firstly carrying out high-pressure water descaling, and then lubricating the inner surface and the outer surface by using glass powder; and (3) reaming by adopting a 2500T vertical reamer, and then carrying out hot extrusion molding by adopting a 6300T horizontal extruder, wherein the extrusion speed is 200-350 mm/s, and the extrusion ratio is 5-15.
8. The method for producing thick-walled super 13Cr seamless steel pipe with 125 steel grade yield strength as claimed in claim 4, wherein: uniformly heating the steel pipe to 960-1010 ℃, preserving heat for 4-8 min/mm, and then quickly cooling by quenching oil; and (3) cooling the steel pipe to 40-50 ℃, uniformly heating to 560-610 ℃, preserving the heat for 6-15 min/mm, and tempering to obtain the 125 steel grade super 13Cr steel pipe.
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