CN115491606B - CO-resistant low Cr content 2 Corrosion oil casing and preparation method thereof - Google Patents

CO-resistant low Cr content 2 Corrosion oil casing and preparation method thereof Download PDF

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CN115491606B
CN115491606B CN202211192415.4A CN202211192415A CN115491606B CN 115491606 B CN115491606 B CN 115491606B CN 202211192415 A CN202211192415 A CN 202211192415A CN 115491606 B CN115491606 B CN 115491606B
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CN115491606A (en
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苏忠贵
苏小东
黄岩岗
李亮
巩朋涛
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YANAN JIASHENG PETROLEUM MACHINERY CO Ltd
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YANAN JIASHENG PETROLEUM MACHINERY CO Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • C—CHEMISTRY; METALLURGY
    • 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
    • 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
    • C21D1/25—Hardening, combined with annealing between 300 degrees Celsius and 600 degrees Celsius, i.e. heat refining ("Vergüten")
    • 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
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • 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
    • 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
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • 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
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • 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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • 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
    • 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
    • Y02P10/20—Recycling

Abstract

The invention discloses a low Cr content CO-resistant alloy 2 The corrosion oil casing and the preparation method thereof, wherein the oil casing comprises the following chemical components in percentage by mass: 0.21 to 0.29 percent of C, 0.25 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 5.50 percent of Cr, 0.35 to 0.50 percent of Mo, 0.15 to 0.25 percent of Ni, 0.15 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.010 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities. The invention providesThe oil sleeve has low Cr content, low cost, high yield strength, good toughness and CO resistance 2 The corrosion performance is good, the yield strength grade can respectively reach the requirements of 80ksi, 110ksi and 125ksi, and the corrosion performance is high in P CO2 ≤0.2MPa、Cl ‑ The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.

Description

CO-resistant low Cr content 2 Corrosion oil casing and preparation method thereof
Technical Field
The invention relates to the technical field of oil casings, in particular to a low-Cr-content CO-resistant oil casing 2 An etched oil casing and a method of making the same.
Background
CO contained in oil gas resources in China 2 Oil and gas are quite common, and the oil casing material is prepared from CO 2 In the oil-gas environment, under the condition of water, chemical or electrochemical reaction can be carried out on the oil sleeve material, so that the oil sleeve material is corroded, uniform corrosion, local corrosion, perforation and even fracture can be caused, and the normal production and safety of an oil-gas field are seriously affected. Generally, for CO 2 In corrosive environment, the oil casing material is preferably stainless steel with Cr content exceeding 12.5%, such as 13Cr and material with better corrosion resistance, and the corrosion resistant material is suitable for high-yield oil and gas fields such as Tarim, but is unacceptable for low-yield oil and gas fields such as Changqing, and the like due to over high cost, thus providing economic CO resistance for low Cr content 2 The need to corrode oil casings.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a CO-resistant alloy with low Cr content 2 Corrosion-resistant oil casing and preparation method thereof, aiming at solving the problem of CO resistance in the prior art 2 The Cr content of the corroded oil sleeve is high, and the cost is high.
The technical scheme of the invention is as follows:
In a first aspect of the invention, a low Cr content CO tolerant alloy 2 Corroding oil casing, wherein the oil casing comprises the following components in percentage by massThe low Cr content is resistant to CO 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.25 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 5.50 percent of Cr, 0.35 to 0.50 percent of Mo, 0.15 to 0.25 percent of Ni, 0.15 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.010 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
Alternatively, the low Cr content is resistant to CO in mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.27 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 3.49 percent of Cr, 0.35 to 0.46 percent of Mo, 0.15 to 0.25 percent of Ni, 0.17 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.01 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.019 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
Alternatively, the low Cr content is resistant to CO in mass percent 2 The corrosion oil casing comprises the following chemical components:
0.22 to 0.27 percent of C, 0.25 to 0.43 percent of Si, 0.93 to 1.07 percent of Mn, 3.5 to 4.49 percent of Cr, 0.35 to 0.50 percent of Mo, 0.20 to 0.25 percent of Ni, 0.15 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.019 percent of Al, 0.005 to 0.009 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0019 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
Alternatively, the low Cr content is resistant to CO in mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.28 percent of C, 0.27 to 0.36 percent of Si, 0.91 to 1.1 percent of Mn, 4.5 to 5.5 percent of Cr, 0.36 to 0.49 percent of Mo, 0.18 to 0.25 percent of Ni, 0.17 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In a second aspect of the invention, a CO-resistant alloy with low Cr content is provided 2 The preparation method of the corrosion oil casing comprises the following steps:
the invention also relates to a CO-resistant alloy with low Cr content 2 After the chemical components of the corroded oil sleeve are subjected to batching, smelting and continuous casting, a continuous casting blank is obtained;
perforating and hot continuous rolling the continuous casting billet to obtain a tube blank;
quenching and tempering heat treatment is carried out on the tube blank to obtain the low-Cr-content CO-resistant tube blank 2 And (5) corroding the oil casing.
Optionally, after smelting and continuous casting, the step of obtaining the continuous casting blank specifically comprises the following steps:
smelting raw materials obtained by batching sequentially through an oxygen blowing converter, feeding rare earth wires, refining outside the converter, vacuum degassing, and carrying out denaturation treatment on inclusions by feeding Si-Ca wires to obtain molten steel;
and casting the molten steel into a rod-shaped continuous casting blank.
Optionally, the step of obtaining the tube blank after perforating and hot continuous rolling the continuous casting blank specifically comprises the following steps:
heating the continuous casting blank to 1200-1250 ℃ in a heating furnace, preserving heat for 90-120 min, then carrying out hot perforation at 1150-1220 ℃, carrying out hot continuous rolling at 950-1150 ℃, and cooling to obtain a tube blank.
Optionally, the tube blank is subjected to tempering heat treatment to obtain the low-Cr-content CO-resistant tube blank 2 The step of corroding the oil casing specifically comprises:
Quenching the tube blank in a protective atmosphere furnace at 890-910 ℃, preserving heat for 40-60 min, cooling, tempering at 600-700 ℃ for 90-120 min, cooling by water, thermally straightening at 530-630 ℃ and cooling by water to obtain the steel tubeCO-resistant with low Cr content 2 And (5) corroding the oil casing.
Optionally, quenching the tube blank at 890-910 ℃, preserving heat for 40-60 min, and cooling at a cooling speed of 20-30 ℃/s.
Optionally, after quenching and tempering the tube blank, obtaining the CO resistant tube with low Cr content 2 Before the oil casing is corroded, the method further comprises the steps of:
and (3) carrying out thread processing on the tube blank subjected to quenching and tempering heat treatment.
The beneficial effects are that: the invention provides a low Cr content CO resistant alloy 2 The corrosion oil sleeve has low Cr content, low cost, high yield strength, good toughness and CO resistance 2 The corrosion performance is good, and the yield strength grade can respectively reach the requirements of 80ksi, 110ksi and 125 ksi. The room temperature yield strength is more than 552-862 MPa, the tensile strength is more than 655-931 MPa, the total elongation is more than or equal to 14-18%, the Charpy impact toughness is more than or equal to 90J, and the strength is P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
Detailed Description
The invention provides a CO-resistant alloy with low Cr content 2 The invention further provides a corrosion oil casing and a preparation method thereof, and aims to make the purposes, technical schemes and effects of the invention clearer and more definite. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Enterprises such as national Baoshan iron and Steel company develop low Cr content economic CO resistance 2 The oil casings are corroded and find application in a number of oil and gas fields. But the prior art has a lower intensity level,insufficient corrosion resistance, inadequate material strength, plastic toughness and corrosion resistance, or technical defects such as mismatching, so that the economic low Cr CO resistance is realized 2 The use of corroded oil casings is very limited. In order to overcome the defects or technical shortcomings, the invention provides a low-Cr CO-resistant alloy 2 Corroding oil pipe and casing pipe and its preparing process to meet the requirement of CO content 2 Low-yield oil and gas field development pair economic CO resistance 2 The need to corrode oil casings.
The embodiment of the invention provides a low-Cr-content CO-resistant alloy 2 A corrosion oil casing, wherein the low Cr content is resistant to CO by mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.25 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 5.50 percent of Cr, 0.35 to 0.50 percent of Mo, 0.15 to 0.25 percent of Ni, 0.15 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.010 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the aspect of component design, the embodiment of the invention comprehensively considers the strength, the plasticity and the toughness, the economy and the CO resistance of the oil casing 2 The invention relates to a corrosion and other multiple requirements, which adopts low C content, cr, mo and Mn, small amount of Ni, cu, nb and Ti are added for microalloying, rare earth element Ce is added, si and N content is controlled, P, S, O, H and other harmful elements in steel are limited, al and Si fully deoxidized killed steel is adopted, and Ca treatment is carried out on molten steel, and the invention creatively designs the chemical components and the content of an oil sleeve to generate synergistic effect among the elements, so that the obtained low Cr content is resistant to CO 2 The corrosion oil sleeve has low cost, high strength, good toughness (toughness is the guarantee of the safe service of steel materials) and CO resistance 2 The corrosion performance, namely the invention obtains higher toughness and CO resistance on the premise of ensuring that the oil casing has higher strength and low cost 2 Corrosiveness. The yield strength grade can respectively reach the requirements of 80ksi, 110ksi and 125ksi, the yield strength at room temperature is more than 552-862 MPa, and the tensile strength is more than655-931 MPa, total elongation of more than or equal to 14-18%, charpy impact toughness of more than or equal to 90J, at P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO 2 Content oil gas development is to economical resistant CO 2 The need to corrode oil casings.
Wherein, C is the most main strengthening element, and low C is adopted to be favorable for improving the toughness and corrosion resistance of the steel, but the too low C content is unfavorable for improving the hardenability of the steel and is unfavorable for improving the strength of the steel; the content of C is too high, and can form carbide with Cr added in steel, so that the action of Cr element for improving the electrode potential of a matrix and further improving corrosion resistance is weakened, and the content of the C is controlled to be 0.21% -0.29% according to the performance requirement and application of the oil casing.
Si is added into steel to easily form a compact oxide film on the surface of the steel in an oxidizing medium, so that the corrosion resistance is improved, but the matrix becomes brittle due to the fact that the content is too high, and therefore the content of Si is controlled to be 0.25% -0.45% according to the performance requirements and the purposes of the oil casing.
Mn is mainly used for improving the hardenability of steel and further improving the strength. According to the embodiment of the invention, the Mn content is controlled to be 0.90-1.10% according to the performance requirement and the application of the oil casing.
Cr can form a compact passivation film in an oxidizing medium to protect the matrix from corrosion, and can also improve the electrode potential of the matrix and the electrochemical corrosion resistance; and meanwhile, the hardenability and strength of the steel can be improved. According to the embodiment of the invention, the Cr content is controlled to be 2.95-5.50% according to the performance requirement and the application of the oil casing; wherein the Cr content of the 3Cr oil sleeve is controlled to be 2.95-3.49%, the Cr content of the 4Cr oil sleeve is controlled to be 3.50-4.49%, and the Cr content of the 5Cr oil sleeve is controlled to be 4.50-5.50%.
Mo is added into steel to stabilize the passive film of the steel, improve the corrosion resistance of the steel and prevent pitting corrosion; and meanwhile, the hardenability of the steel can be improved to improve the strength and the tempering stability. According to the embodiment of the invention, the Mn content is controlled to be 0.35-0.50% according to the performance requirement and the application of the oil casing.
Ni is added into the steel, so that the electrode potential of the matrix can be improved, the electrochemical corrosion resistance is improved, and the effect of being matched with Cr is better; meanwhile, the hardenability, strength and toughness of the steel can be improved, the technological performance of the steel can be improved, and the hot shortness caused by the addition of Cu can be reduced. According to the embodiment of the invention, the Ni content is controlled to be 0.15-0.25% according to the performance requirement and the application of the oil casing.
Cu can improve the corrosion resistance in a non-oxidizing medium and reduce the sensitivity to the pitting corrosion; and simultaneously, the fluidity of the steel can be improved so as to improve the casting process performance. According to the embodiment of the invention, the Cu content is controlled to be 0.15-0.25% according to the performance requirement and the application of the oil casing.
Nb is added into the steel to form NbC and NbN with C, N in the steel, so that Cr carbide can be effectively avoided, the Cr element content in the steel is ensured, and the corrosion resistance is improved; meanwhile, nbC and NbN have the effects of preventing austenite grains from growing and refining the grains, and the strength and toughness of the steel are improved. According to the embodiment of the invention, the Nb content is controlled to be 0.05-0.08% according to the performance requirement and the application of the oil casing.
Ti is added into the steel to form TiC and TiN with C, N in the steel, so that Cr carbide can be effectively avoided, the Cr element content in the steel is ensured, and the corrosion resistance is improved; meanwhile, tiC and TiN have the effects of preventing austenite grains from growing and refining the grains, and the strength and toughness of the steel are improved. According to the embodiment of the invention, the Ti content is controlled to be 0.02% -0.05% according to the performance requirement and the application of the oil casing.
N is a very strong austenite element which is formed and stabilized, and when added into steel, the N can enlarge the austenite phase region of the steel and improve the hardenability, thereby improving the strength of the steel; however, the excessive content can form harmful gas, reduce the metallurgical quality of the steel, or form compounds with Nb and Ti, which is unfavorable for improving the corrosion resistance of the steel. According to the embodiment of the invention, the content of N is controlled to be 0.001-0.010% according to the performance requirement and the application of the oil casing.
Ce: has multiple functions of purifying molten steel, refining grains, modifying impurities and alloying. The embodiment of the invention controls the content of Ce to be 0.006-0.010 percent according to the performance requirement and the application of the oil casing.
The oxide formed by Al and oxygen can play a role in refining grains and improving strength and toughness. Preferably controlled to be 0.005% -0.020%.
Ca can improve the properties and morphology of inclusions, thereby improving toughness and corrosion resistance of steel. Preferably controlled to be 0.005% -0.010%.
P is a harmful element, and mainly affects the plasticity and toughness of steel, and is preferably controlled to be less than or equal to 0.015 percent.
S is a harmful element, and mainly affects the plasticity, toughness and corrosion resistance of steel, and is preferably controlled to be less than or equal to 0.005%.
O is a harmful element, and mainly affects the plasticity, toughness and corrosion resistance of steel, and is preferably controlled to be less than or equal to 0.002%.
H is a harmful element, the plasticity and toughness of the steel are mainly affected, and the H is preferably controlled to be less than or equal to 0.00015 percent.
The method is beneficial to improving the purity of the steel by controlling the harmful elements such as P, S, O, H and the like in the steel so as to improve the toughness and corrosion resistance of the oil casing.
In one embodiment, the low Cr content (3 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.27 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 3.49 percent of Cr, 0.35 to 0.46 percent of Mo, 0.15 to 0.25 percent of Ni, 0.17 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.01 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.019 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength levels of the corroded oil casing can reach the requirements of 80ksi, 110ksi and 125ksi respectively. The room temperature yield strength reaches 573-920 MPa, the tensile strength is greater than 685-989 MPa, the total elongation reaches 22-29%, the Charpy impact toughness reaches 99-139J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oilGas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (3 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.21 to 0.25 percent of C, 0.27 to 0.37 percent of Si, 0.93 to 1.08 percent of Mn, 2.95 to 3.49 percent of Cr, 0.35 to 0.37 percent of Mo, 0.15 to 0.24 percent of Ni, 0.17 to 0.25 percent of Cu, 0.05 to 0.07 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.005 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.010 percent of Al, 0.007 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00014 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 80 ksi. The room temperature yield strength reaches 573-599 MPa, the tensile strength is more than 685-709 MPa, the total elongation reaches 27-29%, the Charpy impact toughness reaches 129-139J, and the tensile strength is more than 685-709 MPa CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (3 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.23 to 0.26 percent of C, 0.32 to 0.41 percent of Si, 0.90 to 1.08 percent of Mn, 2.97 to 3.49 percent of Cr, 0.40 to 0.45 percent of Mo, 0.15 to 0.25 percent of Ni, 0.19 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.005 to 0.008 percent of N, 0.006 to 0.008 percent of Ce, 0.010 to 0.015 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0018 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 110 ksi. The room temperature yield strength reaches 779-793 MPa, and the tensile strength is more than 865-881 MPa, total elongation up to 26-27%, charpy impact toughness up to 113-121J, and P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (3 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.25 to 0.29 percent of C, 0.31 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.99 to 3.45 percent of Cr, 0.39 to 0.46 percent of Mo, 0.21 to 0.25 percent of Ni, 0.19 to 0.24 percent of Cu, 0.05 to 0.07 percent of Nb, 0.02 to 0.05 percent of Ti, 0.006 to 0.010 percent of N, 0.006 to 0.009 percent of Ce, 0.015 to 0.019 percent of Al, 0.006 to 0.009 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.002 percent of S, less than or equal to 0.0016 percent of O, less than or equal to 0.00014 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 125 ksi. The room temperature yield strength reaches 910-920 MPa, the tensile strength is more than 978-989 MPa, the total elongation reaches 22%, the Charpy impact toughness reaches 99-103J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In one embodiment, the low Cr content (4 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following chemical components:
0.22 to 0.27 percent of C, 0.25 to 0.43 percent of Si, 0.93 to 1.07 percent of Mn, 3.5 to 4.49 percent of Cr, 0.35 to 0.50 percent of Mo, 0.20 to 0.25 percent of Ni, 0.15 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.019 percent of Al, 0.005 to 0.009 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0019 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirements of 80, 110 and 125 ksi. The room temperature yield strength reaches 609 to 930MPa, the tensile strength is greater than 716 to 1000MPa, the total elongation reaches 21 to 28 percent, the Charpy impact toughness reaches 95 to 128J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (4 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.22 to 0.25 percent of C, 0.25 to 0.39 percent of Si, 0.94 to 1.07 percent of Mn, 3.5 to 4.49 percent of Cr, 0.35 to 0.40 percent of Mo, 0.20 to 0.25 percent of Ni, 0.15 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.005 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.010 percent of Al, 0.006 to 0.008 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0019 percent of O, less than or equal to 0.00013 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 80 ksi. The room temperature yield strength reaches 609 to 629MPa, the tensile strength is greater than 716 to 737MPa, the total elongation reaches 26 to 28 percent, the Charpy impact toughness reaches 117 to 128J, and the strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (4 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.25 to 0.27 percent of C, 0.29 to 0.36 percent of Si, 0.93 to 1.04 percent of Mn, 3.5 to 4.49 percent of Cr, 0.39 to 0.45 percent of Mo, 0.20 to 0.24 percent of Ni, 0.18 to 0.24 percent of Cu, 0.05 to 0.078 percent of Nb, 0.02 to 0.05 percent of Ti, 0.006 to 0.008 percent of N, 0.006 to 0.009 percent of Ce, 0.011 to 0.013 percent of Al, 0.005 to 0.009 percent of Ca, less than or equal to 0.012 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.0018 percent of O, less than or equal to 0.00014 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 110 ksi. The room temperature yield strength reaches 789-803 MPa, the tensile strength is more than 876-892 MPa, the total elongation reaches 25-26%, the Charpy impact toughness reaches 108-105J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - Under the conditions of 25g/L or less and 170 ℃ or less, the uniform corrosion rate is less than 0.125mm/a, and the requirements of no H2S and low CO content can be met 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In a further embodiment, the low Cr content (4 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.25 to 0.27 percent of C, 0.26 to 0.43 percent of Si, 0.95 to 1.07 percent of Mn, 3.58 to 4.41 percent of Cr, 0.43 to 0.50 percent of Mo, 0.20 to 0.23 percent of Ni, 0.19 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.006 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.016 to 0.019 percent of Al, 0.006 to 0.009 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.0018 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 125 ksi. The room temperature yield strength reaches 921 to 930MPa, the tensile strength is greater than 990 to 1000MPa, the total elongation reaches 21 to 22 percent, the Charpy impact toughness reaches 95 to 99J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In one embodimentThe low Cr content (5 Cr) is CO resistant in mass percent 2 The corrosion oil casing comprises the following components:
0.21 to 0.28 percent of C, 0.27 to 0.36 percent of Si, 0.91 to 1.1 percent of Mn, 4.5 to 5.5 percent of Cr, 0.36 to 0.49 percent of Mo, 0.18 to 0.25 percent of Ni, 0.17 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil sleeve can reach 80, 110 and 125 ksi. The room temperature yield strength reaches 632 to 941MPa, the tensile strength is greater than 743 to 1011MPa, the total elongation reaches 20 to 27 percent, the Charpy impact toughness reaches 91 to 132J, and the product is at P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In one embodiment, the low Cr content (5 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.21 to 0.25 percent of C, 0.27 to 0.36 percent of Si, 0.95 to 1.10 percent of Mn, 4.5 to 5.5 percent of Cr, 0.36 to 0.39 percent of Mo, 0.18 to 0.25 percent of Ni, 0.18 to 0.23 percent of Cu, 0.05 to 0.07 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.005 percent of N, 0.006 to 0.009 percent of Ce, 0.006 to 0.010 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.012 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.0016 percent of O, less than or equal to 0.00014 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 80 ksi. The room temperature yield strength reaches 632-651 MPa, the tensile strength is greater than 743-765 MPa, the total elongation reaches 25-27%, the Charpy impact toughness reaches 115-132J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In one embodiment, the low Cr content (5 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.23 to 0.26 percent of C, 0.28 to 0.35 percent of Si, 0.91 to 1.05 percent of Mn, 4.5 to 5.5 percent of Cr, 0.38 to 0.43 percent of Mo, 0.18 to 0.22 percent of Ni, 0.17 to 0.23 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.005 to 0.0075 percent of N, 0.006 to 0.010 percent of Ce, 0.011 to 0.014 percent of Al, 0.006 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 110 ksi. The room temperature yield strength reaches 807-821 MPa, the tensile strength is greater than 897-912 MPa, the total elongation reaches 24-25%, the Charpy impact toughness reaches 101-107J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In one embodiment, the low Cr content (5 Cr) is CO tolerant in mass percent 2 The corrosion oil casing comprises the following components:
0.26 to 0.28 percent of C, 0.30 to 0.35 percent of Si, 0.94 to 1.09 percent of Mn, 4.59 to 5.44 percent of Cr, 0.44 to 0.49 percent of Mo, 0.21 to 0.25 percent of Ni, 0.19 to 0.24 percent of Cu, 0.06 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.006 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.015 to 0.02 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.012 percent of P, less than or equal to 0.003 percent of S, less than or equal to 0.0019 percent of O, less than or equal to 0.00014 percent of H, and the balance of Fe and unavoidable impurities.
In the present embodiment, the low Cr content is CO-resistant 2 The yield strength grade of the corroded oil casing can reach the requirement of 125 ksi. The room temperature yield strength reaches 931 to 941MPa, the tensile strength is greater than 1001 to 1011MPa, the total elongation reaches 20 to 21 percent, the Charpy impact toughness reaches 91 to 95J, and the tensile strength is equal to P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
The excellent combination property of the oil casing not only requires reasonable design of chemical components and proportion content, but also affects the final property of the oil casing by the manufacturing process. Different chemical composition designs require different manufacturing processes to allow the oil casing to perform optimally. The invention aims at the chemical component development and the matched manufacturing process of the proportion content, mainly comprises the processes of steelmaking (including external refining and vacuum degassing), continuous casting, hot continuous rolling in an austenite area, tempering heat treatment, hot straightening and the like, so that the material obtains a fine and uniform tempered sorbite microstructure structure, and the CO resistance of the oil sleeve is realized 2 The corrosion performance is reasonably matched with the strength and the plasticity and toughness. Specifically, the embodiment of the invention also provides a CO-resistant alloy with low Cr content 2 The preparation method of the corrosion oil casing comprises the following steps:
s1, CO-resistant with low Cr content according to the invention as described above 2 After the ingredients of the corroded oil sleeve are subjected to batching, smelting and continuous casting, a continuous casting blank is obtained;
s2, perforating and hot continuous rolling the continuous casting billet to obtain a tube blank;
s3, carrying out quenching and tempering heat treatment on the tube blank to obtain the low-Cr-content CO-resistant tube blank 2 And (5) corroding the oil casing.
The chemical components and the manufacturing process of the embodiment of the invention are matched for use, and have the advantages of economy, strength improvement, toughness improvement and CO improvement 2 Corrosion resistance effects.
The preparation method of the invention aims at the oil casing pipe with the chemical components to obtain the expected tissue structure and performance, fully plays the performance of the oil casing pipe, has lower cost, and has easily controlled technological parameters in the process, and the obtained oil casing pipe has stable performance.
In step S1, materials including, but not limited to, molten iron, scrap steel, and the like, may be used as raw materials, and desired alloying elements may be added during smelting.
In one embodiment, the step of obtaining the continuous casting billet after smelting and continuous casting specifically includes:
Smelting raw materials obtained by batching sequentially through an oxygen blowing converter, feeding rare earth (Ce) wires, refining outside the converter, vacuum degassing, and feeding Si-Ca wires to denature impurities, so as to obtain molten steel;
and casting the molten steel into a rod-shaped continuous casting blank.
In step S2, in one embodiment, the step of obtaining the tube blank after piercing and hot continuous rolling the continuous casting blank specifically includes:
heating the continuous casting blank to 1200-1250 ℃ in a heating furnace, preserving heat for 90-120 min, then carrying out hot perforation at 1150-1220 ℃, carrying out hot continuous rolling at 950-1150 ℃, and cooling to obtain a tube blank. Specifically, the tube blank can be sawed to a preset length according to actual needs.
In step S3, in one embodiment, the tube blank is subjected to tempering heat treatment to obtain the CO-resistant tube blank with low Cr content 2 The step of corroding the oil casing specifically comprises:
quenching the tube blank in a protective atmosphere furnace (to prevent decarburization) at 890-910 ℃ for 40-60 min, cooling at a cooling rate of 20-30 ℃/s to ensure that all martensitic structure is obtained after quenching, tempering at 600-700 ℃ for 90-120 min, water-cooling to obtain fine uniform tempered sorbite with 8-9 grades of grain size, water-cooling after tempering to avoid possible tempering brittleness, and hot straightening at 530-630 ℃ and water-cooling to obtain the low Cr-content CO-resistant alloy 2 And (5) corroding the oil casing. Wherein the tempering temperature and the hot straightening temperature are resistant to CO according to the low Cr content 2 And adjusting the steel grade of the corroded oil casing. In specific implementation, the 80ksi steel grade has low Cr content and CO resistance 2 Tempering temperature of the corroded oil sleeve is 680-700 ℃, and hot straightening temperature is 610-630 ℃;110 steel grade low Cr content CO resistant 2 Tempering temperature of the corroded oil sleeve is 630-650 ℃, and hot straightening temperature is 560-580 ℃;125ksi steel grade low Cr content CO resistant 2 The tempering temperature of the corroded oil sleeve is 600-620 ℃, and the hot straightening temperature is 530-550 ℃.
In the embodiment, the heat treatment process of quenching and high-temperature tempering refines crystal grains and tissues, and finally, fine and uniform tempered sorbite with the grain size of 9-10 grades can be obtained, so that the strength, the toughness and the CO resistance of the oil casing are improved 2 Corrosion performance.
In one embodiment, the low Cr content CO resistant material is obtained after quenching and tempering the tube blank 2 Before the oil casing is corroded, the method further comprises the steps of:
and (3) carrying out thread processing on the tube blank subjected to quenching and tempering heat treatment.
In this embodiment, API standard threads or special threads may be machined in the pipe section according to actual needs, and magnetic particle inspection may be performed on the threads.
The following is a detailed description of specific examples.
Example 1
Steelmaking: CO-resistant with low Cr content according to example 1 shown in Table 1 below 2 The ingredients of the corroded oil sleeve are proportioned, sponge iron and high-quality scrap steel are used as raw materials, and then molten steel is obtained by carrying out modification treatment on inclusions through oxygen-blown converter steelmaking, rare earth wire feeding, external refining, vacuum degassing and Si-Ca wire feeding in sequence;
continuous casting: casting molten steel into a bar-shaped continuous casting blank, and adopting electromagnetic stirring and soft reduction technology in the continuous casting process to control segregation in the continuous casting bar blank;
perforating and hot continuous rolling: heating the continuous casting blank in an annular heating furnace at 1225 ℃ for 100min, then performing hot perforation at 1185 ℃, performing hot continuous rolling at 1050 ℃, cooling, and sawing to a preset length to obtain a tube blank;
and (3) heat treatment: heating (preventing decarburization) the tube blank in a protective atmosphere furnace at 890 DEG CQuenching at a certain temperature, preserving heat for 60min, quenching by spraying water from inside to outside, and then cooling at a cooling speed of 20 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at 680 ℃ for 120min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at the temperature of 610 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr80.
Example 2
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 2 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 3Cr80.
Example 3
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 3 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 900 ℃, preserving heat for 50min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling speed of 25 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at 690 ℃ for 100min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 620 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr80.
Example 4
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 4 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 910 ℃, preserving heat for 40min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling rate of 30 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at the temperature of 700 ℃ for 90min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 630 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr80.
Example 5
CO resistance with low Cr content in example 4 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 5 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 3Cr80.
Example 6
CO-resistant with low Cr content as described in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 6 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 7
CO resistance with low Cr content in example 2 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 7 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 8
CO resistance with low Cr content in example 3 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 8 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 9
CO resistance with low Cr content in example 4 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 9 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 10
CO resistance with low Cr content in example 5 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 10 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 11
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 11 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr80.
Example 12
CO resistance with low Cr content in example 2 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 12 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr80.
Example 13
CO resistance with low Cr content in example 3 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) According to the implementation shown in Table 1 belowCO-resistant with low Cr content of example 13 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr80.
Example 14
CO resistance with low Cr content in example 4 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 14 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr80.
Example 15
CO resistance with low Cr content in example 5 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 15 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr80.
Example 16
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 16 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 890 ℃, preserving heat for 60min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling speed of 20 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at the temperature of 630 ℃ for 120min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 560 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was etched and designated 3Cr110.
Example 17
CO resistance with low Cr content in example 16 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 17 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 3Cr110.
Example 18
CO resistance with low Cr content in example 16 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 18 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 900 ℃, preserving heat for 50min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling speed of 25 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at 640 ℃ for 100min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 570 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was etched and designated 3Cr110.
Example 19
CO resistance with low Cr content in example 16 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 19 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 910 ℃, preserving heat for 40min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling rate of 30 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at the temperature of 650 ℃ for 90min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at the temperature of 580 ℃ and then carrying out water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was etched and designated 3Cr110.
Example 20
CO resistance with low Cr content in example 19 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 20 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 3Cr110.
Example 21
CO resistance with low Cr content in example 16 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 21 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 4Cr110.
Example 22
CO resistance with low Cr content in example 17 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 22 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 4Cr110.
Example 23
CO resistance with low Cr content in example 18 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 23 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 4Cr110.
Example 24
CO resistance with low Cr content in example 19 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 24 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 4Cr110.
Example 25
CO resistance with low Cr content in example 20 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 25 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 4Cr110.
Example 26
CO resistance with low Cr content in example 16 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 26 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 5Cr110.
Example 27
CO resistance with low Cr content in example 17 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 27 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 5Cr110.
Example 28
CO resistance with low Cr content in example 18 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 28 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 5Cr110.
Example 29
CO resistance with low Cr content in example 19 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 29 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 5Cr110.
Example 30
CO resistance with low Cr content in example 20 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 30 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was etched and designated 5Cr110.
Example 31
CO resistance with low Cr content in example 1 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 31 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 890 ℃, preserving heat for 60min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling speed of 20 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at 600 ℃ for 120min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 530 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr125.
Example 32
CO resistance with low Cr content in example 31 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 32 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 3Cr125.
Example 33
CO resistance with low Cr content in example 31 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 32 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Adding in a protective atmosphere furnaceQuenching the tube blank at 900 ℃, preserving heat for 50min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling rate of 25 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at the temperature of 610 ℃ for 100min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 540 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr125.
Example 34
CO resistance with low Cr content in example 31 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 34 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned;
(2) Heating (preventing decarburization) in a protective atmosphere furnace, quenching the tube blank at 910 ℃, preserving heat for 40min, spraying water to quench the tube blank internally and externally, and then cooling at a cooling rate of 30 ℃/s to ensure that more than 95% of martensitic structure is obtained after quenching; tempering is carried out at the temperature of 620 ℃ for 90min to obtain fine and uniform tempered sorbite with the grain size of 8-9 grades, and water cooling is carried out after tempering to avoid possible tempering brittleness; then carrying out hot straightening at 550 ℃ and then water cooling to obtain the low-Cr-content CO-resistant alloy 2 The oil casing was corroded and designated 3Cr125.
Example 35
CO resistance with low Cr content in example 34 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 35 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 3Cr125.
Example 36
CO resistance with low Cr content in example 31 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) Root of Chinese characterCO-resistant with low Cr content according to example 36 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr125.
Example 37
CO resistance with low Cr content in example 32 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 37 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr125.
Example 38
CO resistance with low Cr content in example 33 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 38 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr125.
Example 39
CO resistance with low Cr content in example 34 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 39 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr125.
Example 40
CO resistance with low Cr content in example 35 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 40 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 4Cr125.
Example 41
CO resistance with low Cr content in example 31 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) According to Table 1 belowLow Cr content CO tolerance of example 41 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr125.
Example 42
CO resistance with low Cr content in example 32 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 42 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr125.
Example 43
CO resistance with low Cr content in example 33 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 43 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr125.
Example 44
CO resistance with low Cr content in example 34 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 44 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr125.
Example 45
CO resistance with low Cr content in example 35 2 The preparation method of the corrosion oil casing is basically the same, and the difference is that:
(1) CO-resistant with low Cr content according to example 45 shown in Table 1 below 2 Ingredients of the corroded oil sleeve are proportioned; obtaining the CO resistant alloy with low Cr content 2 The oil casing was corroded and designated 5Cr125.
TABLE 1 CO tolerance with low Cr content in examples 1-11 2 Chemical composition of corrosive oil casing
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CO-resistant with low Cr content prepared in examples 1-45 2 The corrosion oil casing was subjected to grain size testing, yield strength testing, tensile strength testing, elongation testing, charpy V-notch impact toughness testing, and uniform corrosion rate testing, the results of which are shown in table 2 below.
TABLE 2 CO tolerance with low Cr content in examples 1-11 2 Performance of corroding oil casing
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The test results show that the invention is prepared into the low-Cr-content CO-resistant material through proper preparation process and reasonable chemical composition design 2 The corrosion oil casing has excellent strength, plasticity, toughness and CO resistance 2 Corrosion performance and other comprehensive performances, can meet the requirement of not containing H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
In summary, the invention provides a CO-resistant alloy with low Cr content 2 Corrosion oil casing and preparation method thereof, and low-Cr content CO-resistant 2 The corrosion oil sleeve has low Cr content, low cost, high yield strength, good toughness and CO resistance 2 The corrosion performance is good, and the yield strength grade can respectively reach the requirements of 80ksi, 110ksi and 125 ksi. The room temperature yield strength is more than 552-862 MPa, the tensile strength is more than 655-931 MPa, the total elongation is more than or equal to 14-18%,the Charpy impact toughness is more than or equal to 90J, at P CO2 ≤0.2MPa、Cl - The uniform corrosion rate is less than 0.125mm/a under the conditions of less than or equal to 25g/L and the temperature of less than or equal to 170 ℃ and can meet the requirement of no H 2 S, low CO content 2 Environmental oil and gas field development is to economical resistant CO 2 The need to corrode oil casings.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (10)

1. CO-resistant low Cr content 2 The corrosion oil casing is characterized in that the low Cr content is resistant to CO by mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.25 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 5.50 percent of Cr, 0.35 to 0.50 percent of Mo, 0.15 to 0.25 percent of Ni, 0.15 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.010 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
The low Cr content is resistant to CO 2 The preparation method of the corrosion oil casing comprises the following steps:
CO-resistant according to said low Cr content 2 Preparing chemical components of the corroded oil casing;
smelting raw materials obtained by batching sequentially through an oxygen blowing converter, feeding rare earth wires, refining outside the converter, vacuum degassing, and carrying out denaturation treatment on inclusions by feeding Si-Ca wires to obtain molten steel;
casting the molten steel into a rod-shaped continuous casting blank;
heating the continuous casting blank to 1200-1250 ℃ in a heating furnace, preserving heat for 90-120 min, then carrying out hot piercing at 1150-1220 ℃, carrying out hot continuous rolling at 950-1150 ℃, and cooling to obtain a tube blank;
In a protective atmosphereQuenching the tube blank in a furnace at 890-910 ℃, preserving heat for 40-60 min, cooling at a cooling rate of 20-30 ℃/s, tempering at 600-700 ℃, preserving heat for 90-120 min, cooling with water, thermally straightening at 530-630 ℃ and cooling with water to obtain the low-Cr CO-resistant alloy material 2 And (5) corroding the oil casing.
2. CO resistant with low Cr content according to claim 1 2 The corrosion oil casing is characterized in that the low Cr content is resistant to CO by mass percent 2 The corrosion oil casing comprises the following chemical components:
0.21 to 0.29 percent of C, 0.27 to 0.45 percent of Si, 0.90 to 1.10 percent of Mn, 2.95 to 3.49 percent of Cr, 0.35 to 0.46 percent of Mo, 0.15 to 0.25 percent of Ni, 0.17 to 0.25 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.001 to 0.01 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.019 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
3. CO resistant with low Cr content according to claim 1 2 The corrosion oil casing is characterized in that the low Cr content is resistant to CO by mass percent 2 The corrosion oil casing comprises the following chemical components:
0.22 to 0.27 percent of C, 0.25 to 0.43 percent of Si, 0.93 to 1.07 percent of Mn, 3.5 to 4.49 percent of Cr, 0.35 to 0.50 percent of Mo, 0.20 to 0.25 percent of Ni, 0.15 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.005 to 0.019 percent of Al, 0.005 to 0.009 percent of Ca, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, less than or equal to 0.0019 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
4. CO resistant with low Cr content according to claim 1 2 The corrosion oil casing is characterized in that the low Cr content is resistant to CO by mass percent 2 The corrosion oil casing comprises the following chemical componentsThe method comprises the following steps:
0.21 to 0.28 percent of C, 0.27 to 0.36 percent of Si, 0.91 to 1.1 percent of Mn, 4.5 to 5.5 percent of Cr, 0.36 to 0.49 percent of Mo, 0.18 to 0.25 percent of Ni, 0.17 to 0.24 percent of Cu, 0.05 to 0.08 percent of Nb, 0.02 to 0.05 percent of Ti, 0.002 to 0.009 percent of N, 0.006 to 0.010 percent of Ce, 0.006 to 0.020 percent of Al, 0.005 to 0.010 percent of Ca, less than or equal to 0.013 percent of P, less than or equal to 0.004 percent of S, less than or equal to 0.002 percent of O, less than or equal to 0.00015 percent of H, and the balance of Fe and unavoidable impurities.
5. CO-resistant low Cr content 2 The preparation method of the corrosion oil casing is characterized by comprising the following steps:
CO-resistant with low Cr content according to any one of claims 1 to 4 2 After the chemical components of the corroded oil sleeve are subjected to batching, smelting and continuous casting, a continuous casting blank is obtained;
perforating and hot continuous rolling the continuous casting billet to obtain a tube blank;
quenching and tempering heat treatment is carried out on the tube blank to obtain the low-Cr-content CO-resistant tube blank 2 And (5) corroding the oil casing.
6. The CO-resistant low Cr content alloy according to claim 5 2 The preparation method of the corrosion oil sleeve is characterized by comprising the following steps of smelting and continuous casting to obtain a continuous casting blank:
smelting raw materials obtained by batching sequentially through an oxygen blowing converter, feeding rare earth wires, refining outside the converter, vacuum degassing, and carrying out denaturation treatment on inclusions by feeding Si-Ca wires to obtain molten steel;
and casting the molten steel into a rod-shaped continuous casting blank.
7. The CO-resistant low Cr content alloy according to claim 5 2 The preparation method of the corrosion oil sleeve is characterized in that the steps of perforating and hot continuous rolling the continuous casting blank to obtain a tube blank specifically comprise the following steps:
heating the continuous casting blank to 1200-1250 ℃ in a heating furnace, preserving heat for 90-120 min, then carrying out hot perforation at 1150-1220 ℃, carrying out hot continuous rolling at 950-1150 ℃, and cooling to obtain a tube blank.
8. The CO-resistant low Cr content alloy according to claim 5 2 The preparation method of the corrosion oil sleeve is characterized in that the pipe blank is subjected to quenching and tempering heat treatment to obtain the low-Cr-content CO-resistant pipe blank 2 The step of corroding the oil casing specifically comprises:
quenching the tube blank in a protective atmosphere furnace at 890-910 ℃, preserving heat for 40-60 min, cooling, tempering at 600-700 ℃ for 90-120 min, cooling by water, thermally straightening at 530-630 ℃ and cooling by water to obtain the low-Cr-content CO-resistant material 2 And (5) corroding the oil casing.
9. The CO-resistant low Cr content alloy according to claim 8 2 The preparation method of the corrosion oil sleeve is characterized in that the pipe blank is quenched at 890-910 ℃, and is cooled at a cooling speed of 20-30 ℃/s after heat preservation for 40-60 min.
10. The CO-resistant low Cr content alloy according to claim 5 2 The preparation method of the corrosion oil sleeve is characterized in that after quenching and tempering heat treatment is carried out on the tube blank, the CO resistant low Cr content tube blank is obtained 2 Before the oil casing is corroded, the method further comprises the steps of:
and (3) carrying out thread processing on the tube blank subjected to quenching and tempering heat treatment.
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