CN117265374A - Austenitic stainless steel oil pipe for acid corrosion oil and gas well and processing method thereof - Google Patents
Austenitic stainless steel oil pipe for acid corrosion oil and gas well and processing method thereof Download PDFInfo
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- CN117265374A CN117265374A CN202210668692.1A CN202210668692A CN117265374A CN 117265374 A CN117265374 A CN 117265374A CN 202210668692 A CN202210668692 A CN 202210668692A CN 117265374 A CN117265374 A CN 117265374A
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims abstract description 71
- 230000007797 corrosion Effects 0.000 title claims abstract description 48
- 238000005260 corrosion Methods 0.000 title claims abstract description 48
- 239000002253 acid Substances 0.000 title claims abstract description 23
- 238000003672 processing method Methods 0.000 title abstract description 8
- 239000007789 gas Substances 0.000 claims abstract description 26
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 229910052729 chemical element Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 73
- 238000000034 method Methods 0.000 claims description 48
- 230000008569 process Effects 0.000 claims description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 26
- 238000005097 cold rolling Methods 0.000 claims description 26
- 230000009467 reduction Effects 0.000 claims description 23
- 239000000243 solution Substances 0.000 claims description 13
- 238000005242 forging Methods 0.000 claims description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 229910045601 alloy Inorganic materials 0.000 claims description 10
- 239000000956 alloy Substances 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 9
- 238000007689 inspection Methods 0.000 claims description 9
- 238000003723 Smelting Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 5
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 5
- 229910001566 austenite Inorganic materials 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 3
- 229910001309 Ferromolybdenum Inorganic materials 0.000 claims description 3
- 229910000863 Ferronickel Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 239000012490 blank solution Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 238000001192 hot extrusion Methods 0.000 claims description 3
- 230000002706 hydrostatic effect Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000005121 nitriding Methods 0.000 claims description 3
- 238000010422 painting Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000002893 slag Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 10
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 abstract description 8
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 abstract description 6
- 229910000037 hydrogen sulfide Inorganic materials 0.000 abstract description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 5
- 229910002092 carbon dioxide Inorganic materials 0.000 abstract description 5
- 239000001569 carbon dioxide Substances 0.000 abstract description 5
- 239000003345 natural gas Substances 0.000 abstract description 4
- 239000003209 petroleum derivative Substances 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 10
- 238000005336 cracking Methods 0.000 description 7
- 229910052759 nickel Inorganic materials 0.000 description 5
- 229910000734 martensite Inorganic materials 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 229910001105 martensitic stainless steel Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000005482 strain hardening Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- C21D1/26—Methods of annealing
-
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—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
- C22C38/18—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
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Heat Treatment Of Steel (AREA)
Abstract
The invention relates to the technical field of petroleum and natural gas pipelines, in particular to an austenitic stainless steel oil pipe for an acid corrosion oil and gas well and a processing method. An austenitic stainless steel oil pipe for an acid corrosion oil-gas well comprises the following chemical element components in percentage by weight: c is less than or equal to 0.03 percent, si:0.15% -0.3%, P: less than or equal to 0.010 percent, S: less than or equal to 0.005 percent, cr:20.0% -24.0%, mn:14.0% -20%, ni:5.0% -10.0%, mo:3.0% -5.0%, cu:0.25% -0.50%, N:0.4% -0.6%, V: less than or equal to 0.1 percent, nb: less than or equal to 0.1 percent, ca is 0.001 to 0.003 percent, re: 0.01-0.03%, and the balance being Fe and unavoidable impurities. The oil pipe meets the mechanical property requirement of a 110ksi steel grade oil pipe, has yield strength of 760-660 MPa, tensile strength of 900-1050MPa, elongation of more than or equal to 40%, full-size transverse impact energy of more than or equal to 110J at-10 ℃, full-size longitudinal impact energy of more than or equal to 130J, austenitic structure, high strength and toughness matching and excellent corrosion resistance, and is used for severe service conditions of an acid oil gas well containing complex corrosive media such as hydrogen sulfide, carbon dioxide, chloride ions and the like.
Description
Technical Field
The invention relates to the technical field of petroleum and natural gas pipelines, in particular to an austenitic stainless steel oil pipe for an acid corrosion oil and gas well and a processing method thereof.
Background
Along with the gradual severe exploitation environment of petroleum and natural gas resources, the requirements of an oil and gas well on the mechanical property, corrosion resistance and the like of a tubular column are higher and higher, and particularly, the conventional carbon steel or low alloy steel oil well pipe is easy to corrode and crack and even cause serious safety accidents in the environment for a long time aiming at the corrosion environment of underground high temperature, high pressure, high concentration carbon dioxide and a small amount of hydrogen sulfide or chloride ions. For the service condition of severe corrosion, stainless steel or nickel-based alloy products are generally required to meet the corrosion resistance requirement, but the limitation of nickel resources and the high cost of the corrosion-resistant oil well pipe limit further wide application. Therefore, the oil well pipe product with good toughness, good corrosion resistance and relative economy is developed, and has important engineering significance for solving the pipe column corrosion problem under severe corrosion working conditions.
The prior stainless steel oil well pipe generally adopts a martensitic structure, and international patent WO2017/162160 A1 discloses a martensitic stainless steel oil sleeve with H2S stress corrosion cracking resistance, which is mainly characterized by comprising the following chemical elements in percentage by mass: c:<0.05%, cr: 11-14%, ni: 4-7%, mo:1.5 to 2.5 percent; the metal structure is mainly composed of tempered martensite and can be used for high-concentration CO 2 、Cl - In oil and gas wells of crude oil or natural gas in coexisting highly corrosive environments, but H thereof 2 The S-applicable environment is limited to 0.01MPa, and the strength is only 95ksi. International patent WO 2005/007415A 1 discloses a steel having a superior H-resistance to super 13Cr steel 2 The S stress corrosion martensitic stainless steel is mainly characterized in that the maximum Mo content is not more than 10 percent, and the corrosion resistance and H resistance are improved by controlling the solid solution Mo content to be 3.5-7 percent 2 S (hydrogen embrittlement) stress corrosion capability. The martensitic stainless steel has high mechanical strength and is resistant to CO 2 Has excellent corrosion resistance in the environment, but is applicable to H 2 The S partial pressure is only 0.003Mpa.
Disclosure of Invention
Aiming at the problems, the invention aims to provide the austenitic stainless steel oil pipe for the acid corrosion oil-gas well and the processing method thereof.
The technical scheme of the invention is as follows: an austenitic stainless steel oil pipe for an acid corrosion oil-gas well comprises the following chemical element components in percentage by weight: c is less than or equal to 0.03 percent, si:0.15% -0.3%, P: less than or equal to 0.010 percent, S: less than or equal to 0.005 percent, cr:20.0% -24.0%, mn:14.0% -20%, ni:5.0% -10.0%, mo:3.0% -5.0%, cu:0.25% -0.50%, N:0.4% -0.6%, V: less than or equal to 0.1 percent, nb: less than or equal to 0.1 percent, ca is 0.001 to 0.003 percent, re: 0.01-0.03%, and the balance being Fe and unavoidable impurities.
The processing method of the austenitic stainless steel oil pipe for the acid corrosion oil and gas well comprises the following steps of:
s1: preparing an austenitic stainless steel cast ingot: adding aluminum or silicon steel deoxidizer into micro-carbon ferrochrome, manganese metal, ferronickel alloy, ferromolybdenum and industrial pure iron serving as raw materials under the nitrogen protection atmosphere of 0.1-0.5 MPa, smelting by adopting a vacuum induction furnace, adding nitriding alloy when the smelting temperature is controlled within the range of 1500-1550 ℃, and then performing nitrogen protection casting at the casting temperature within the range of 1450-1480 ℃ to prepare an austenitic stainless steel cast ingot;
s2: electroslag remelting: preparing an austenitic stainless steel cast ingot into a consumable electrode for electroslag remelting, carrying out electroslag remelting under the protection of nitrogen, selecting a corresponding slag system in the electroslag remelting process, deoxidizing by adopting Si or Ca, and carrying out nondestructive inspection and inclusion analysis after the electroslag remelting;
s3: forging austenitic stainless steel cast ingot: forging an austenitic stainless steel cast ingot after electroslag remelting, wherein the austenitic stainless steel cast ingot is heated at 1200-1250 ℃ for 2-3 hours, forging an austenitic stainless steel cast ingot with the diameter of 300-350 mm into a steel ingot with the diameter of 200-220 mm, and controlling the final forging temperature to be not lower than 1050 ℃;
s4: and (3) pipe manufacturing: preparing a forged austenitic stainless steel cast ingot into a blank pierced blank of an oil pipe by a hot extrusion mode, preparing an oil pipe blank of a required specification by adopting a multi-pass cold rolling mode, and obtaining a finished oil pipe blank of an austenitic structure through solution treatment of a whole pipe body, wherein annealing is carried out among cold rolling passes;
s5: and carrying out nondestructive inspection on the tube blank of the finished oil tube, and carrying out tube end threading, coupling screwing, hydrostatic test, protection ring feeding, mark spraying and painting after the inspection is qualified to prepare the finished oil tube.
And after the preparation of the austenitic stainless steel cast ingot in the step S1 is finished, performing element analysis, flaw detection and machining treatment on the austenitic stainless steel cast ingot, and removing surface defects and black skin.
The pitting equivalent value PREN of the austenitic stainless steel casting ingot material in the step S1 is more than or equal to 40.
In the S4 pipe making process, the austenitic stainless steel blank pipe is subjected to 5-pass cold rolling reduction, wherein the reduction ratio of the first 3 passes is 18% -25%, the reduction ratio of the fourth pass is 5% -10%, and the reduction ratio of the fourth pass is 10% -15%.
In the S4 pipe making process, the temperature is controlled to be within the range of 450-550 ℃ during the cold rolling of the austenitic stainless steel blank pierced billet, and the annealing temperature between cold rolling passes is within the range of 650-700 ℃ for 1-3 hours.
In the S4 pipe making process, the heat treatment parameters of the pipe blank solution treatment are as follows: the temperature is higher than 1100 ℃ for more than 4 hours, and the air cooling is carried out to the room temperature.
In the S4 pipe making process, the structure form of the finished oil pipe blank after the pipe blank is subjected to solution treatment is an austenite structure, and the delta phase content is less than 3%.
In the S4 pipe making process, the yield strength of the processed pipe blank of the oil pipe is 760-780 MPa, the tensile strength is 900-1050MPa, the elongation is more than or equal to 40%, the full-size transverse impact energy at-10 ℃ is more than or equal to 110J, and the full-size longitudinal impact energy is more than or equal to 130J.
The carbon content of the micro-carbon ferrochrome used in the invention is less than 0.15%, and the micro-carbon ferrochrome is mainly used for improving the oxidation resistance and corrosion resistance of steel, so that a layer of oxidation film with strong adhesion is formed on the surface of the steel in an oxidation atmosphere.
The invention has the beneficial effects that: 1. according to the invention, low-cost manganese and nitrogen elements are adopted to replace part of expensive nickel elements, and a proper amount of alloy elements are added, so that the cost of stainless steel alloy is reduced, high-temperature thermoplastic property, hot working performance and good tissue stability of austenitic stainless steel are ensured, the cracking problem in the extrusion process of an oil pipe blank is avoided, the precipitation sensitivity of harmful phases in the heat treatment process of the oil pipe is reduced, and the good toughness and corrosion resistance of an oil pipe product are ensured; 2. according to the invention, 5-pass cold rolling reducing is adopted in the pipe manufacturing process, wherein the reduction ratio of the first 3 passes is 18% -25%, so that the problem of pipe blank cracking caused by overlarge reducing is avoided, the reduction ratio of the fourth pass is 5% -10%, the reduction ratio of the fifth pass is 10% -15%, the reduction ratio of the fourth pass is slightly increased compared with the reduction ratio of the fourth pass, and the reduction ratio of the fourth pass is combined with the solution heat treatment process of the whole pipe body, so that the grain size can be thinned, the grain boundary specific surface area of the grain is increased, and good comprehensive mechanical property and corrosion property are obtained; 3. according to the invention, in the cold rolling reducing process, temperature control cold rolling is adopted at the temperature ranging from 450 ℃ to 550 ℃, and annealing at the temperature close to the recrystallization temperature is adopted between each pass, so that on one hand, the high dislocation density formed in the cold rolling reducing process due to the enhancement of the work hardening capacity of austenitic stainless steel by adding nitrogen element can be reduced by the temperature control cold rolling, and the problem of cracking of a tube blank in the cold rolling process due to partial martensitic transformation of metastable austenite changing lattice structure caused by cold deformation is reduced; on the other hand, the high-temperature annealing can reduce or eliminate deformed tissues and high-density dislocation, and is used for preparing for the next cold rolling; 4. the oil pipe meets the mechanical property requirement of a 110ksi steel grade oil pipe, has yield strength of 760-660 MPa, tensile strength of 900-1050MPa, elongation of more than or equal to 40%, full-size transverse impact energy of more than or equal to 110J at-10 ℃, full-size longitudinal impact energy of more than or equal to 130J, austenitic structure, high product toughness matching and excellent corrosion resistance, and can be applied to severe service conditions of acid oil gas wells containing complex corrosive media such as hydrogen sulfide, carbon dioxide, chloride ions and the like.
Detailed Description
The invention is described in further detail below with reference to examples:
example 1
An austenitic stainless steel oil pipe for an acid corrosion oil-gas well comprises the following chemical element components in percentage by weight: c is less than or equal to 0.03 percent, si:0.15% -0.3%, P: less than or equal to 0.010 percent, S: less than or equal to 0.005 percent, cr:20.0% -24.0%, mn:14.0% -20%, ni:5.0% -10.0%, mo:3.0% -5.0%, cu:0.25% -0.50%, N:0.4% -0.6%, V: less than or equal to 0.1 percent, nb: less than or equal to 0.1 percent, ca is 0.001 to 0.003 percent, re: 0.01-0.03%, and the balance being Fe and unavoidable impurities.
The invention adopts cheap manganese and nitrogen to replace part of expensive nickel elements and adds a proper amount of alloy elements, thereby not only reducing the cost of stainless steel alloy, but also ensuring the high temperature thermoplastic property, hot working performance and good tissue stability of austenitic stainless steel, avoiding the cracking problem in the extrusion process of the pipe blank of the oil pipe, reducing the precipitation sensitivity of harmful phases in the heat treatment process of the oil pipe and ensuring the good toughness and corrosion resistance of the oil pipe product.
Example 2
A processing method of an austenitic stainless steel oil pipe for an acid corrosion oil-gas well comprises the following steps:
s1: preparing an austenitic stainless steel cast ingot: adding aluminum or silicon steel deoxidizer into micro-carbon ferrochrome, manganese metal, ferronickel alloy, ferromolybdenum and industrial pure iron serving as raw materials under the nitrogen protection atmosphere of 0.1-0.5 MPa, smelting by adopting a vacuum induction furnace, adding nitriding alloy when the smelting temperature is controlled within the range of 1500-1550 ℃, and then performing nitrogen protection casting at the casting temperature within the range of 1450-1480 ℃ to prepare an austenitic stainless steel cast ingot;
s2: electroslag remelting: preparing an austenitic stainless steel cast ingot into a consumable electrode for electroslag remelting, carrying out electroslag remelting under the protection of nitrogen, selecting a corresponding slag system in the electroslag remelting process, deoxidizing by adopting Si or Ca, and carrying out nondestructive inspection and inclusion analysis after the electroslag remelting;
s3: forging austenitic stainless steel cast ingot: forging an austenitic stainless steel cast ingot after electroslag remelting, wherein the austenitic stainless steel cast ingot is heated at 1200-1250 ℃ for 2-3 hours, forging an austenitic stainless steel cast ingot with the diameter of 300-350 mm into a steel ingot with the diameter of 200-220 mm, and controlling the final forging temperature to be not lower than 1050 ℃;
s4: and (3) pipe manufacturing: preparing a forged austenitic stainless steel cast ingot into a blank pierced blank of an oil pipe by a hot extrusion mode, preparing an oil pipe blank of a required specification by adopting a multi-pass cold rolling mode, and obtaining a finished oil pipe blank of an austenitic structure through solution treatment of a whole pipe body, wherein annealing is carried out among cold rolling passes;
s5: and carrying out nondestructive inspection on the tube blank of the finished oil tube, and carrying out tube end threading, coupling screwing, hydrostatic test, protection ring feeding, mark spraying and painting after the inspection is qualified to prepare the finished oil tube.
And after the preparation of the austenitic stainless steel cast ingot in the step S1 is finished, performing element analysis, flaw detection and machining treatment on the austenitic stainless steel cast ingot, and removing surface defects and black skin.
The pitting equivalent value PREN of the austenitic stainless steel casting ingot material in the step S1 is more than or equal to 40.
In the S4 pipe making process, the austenitic stainless steel blank pipe is subjected to 5-pass cold rolling reduction, wherein the reduction ratio of the first 3 passes is 18% -25%, the reduction ratio of the fourth pass is 5% -10%, and the reduction ratio of the fourth pass is 10% -15%.
According to the invention, 5-pass cold rolling reducing is adopted in the pipe manufacturing process, wherein the reduction ratio of the first 3 passes is 18% -25%, so that the problem of pipe blank cracking caused by overlarge reducing is avoided, the reduction ratio of the fourth pass is 5% -10%, the reduction ratio of the fifth pass is 10% -15%, the reduction ratio of the fourth pass is slightly increased compared with the reduction ratio of the fourth pass, and the method is combined with the solution heat treatment process of the whole pipe body, so that the grain size can be thinned, the grain boundary specific surface area of the grain is increased, and good comprehensive mechanical property and corrosion property are obtained.
In the S4 pipe making process, the temperature is controlled to be within the range of 450-550 ℃ during the cold rolling of the austenitic stainless steel blank pierced billet, and the annealing temperature between cold rolling passes is within the range of 650-700 ℃ for 1-3 hours.
According to the invention, the work hardening capacity of austenitic stainless steel can be obviously improved by introducing nitrogen element, so that the cold deformation work hardening index is higher, the dislocation density is reduced by cold rolling at the temperature controlled within the range of 450-550 ℃, metastable austenite is controlled to change the lattice structure due to cold deformation from the surface, partial martensitic transformation occurs, the cracking problem of a tube blank in the cold rolling process is reduced, annealing at the temperature close to the recrystallization temperature is performed between 650-700 ℃, deformation tissues and high-density dislocation are reduced or eliminated, and preparation is made for the next cold rolling.
In the S4 pipe making process, the heat treatment parameters of the pipe blank solution treatment are as follows: the temperature is higher than 1100 ℃ for more than 4 hours, and the air cooling is carried out to the room temperature.
In the S4 pipe making process, the structure form of the finished oil pipe blank after the pipe blank is subjected to solution treatment is an austenite structure, and the delta phase content is less than 3%.
In the S4 pipe making process, the yield strength of the processed pipe blank of the oil pipe is 760-780 MPa, the tensile strength is 900-1050MPa, the elongation is more than or equal to 40%, the full-size transverse impact energy at-10 ℃ is more than or equal to 110J, and the full-size longitudinal impact energy is more than or equal to 130J.
The oil pipe meets the mechanical property requirement of a 110ksi steel grade oil pipe, has yield strength of 760-660 MPa, tensile strength of 900-1050MPa, elongation of more than or equal to 40%, full-size transverse impact energy of more than or equal to 110J at-10 ℃, full-size longitudinal impact energy of more than or equal to 130J, austenitic structure, high product toughness matching and excellent corrosion resistance, and can be applied to severe service conditions of acid oil gas wells containing complex corrosive media such as hydrogen sulfide, carbon dioxide, chloride ions and the like.
In each of examples 3, 4 and 5, the austenitic stainless steel oil pipe for acid-etched oil and gas wells is processed by the processing method of the austenitic stainless steel oil pipe for acid-etched oil and gas wells described in example 2, the specific chemical compositions of smelting the austenitic stainless steel oil pipe in examples 3 to 5 are shown in table 1, and the balance is iron and unavoidable impurities.
Table 1 smelting chemical composition (weight percent/%) of austenitic stainless steel tubing in examples 3-5
Note that: pren=w (Cr) +3.3×w (Mo) +16×w (N)
As can be seen from Table 1, the invention not only ensures the austenitic structure of the stainless steel, but also reduces the alloy cost of the stainless steel by adding the cheap elements of N and Mn to replace expensive nickel elements, and the pitting corrosion resistance equivalent PREN of Cr, mn and N is more than or equal to 40.
The solution treatment process and the mechanical property detection results of the austenitic stainless steel pipe blanks in examples 3-5 are shown in table 2, wherein three detection samples are taken from each test steel after the solution treatment to test the tensile strength, the yield strength and the toughness, and the average value of the three samples is recorded as the result in table 2. The results of the pitting corrosion and uniform corrosion performance tests of the austenitic stainless oil pipes in examples 3 to 5 are shown in Table 3, three test specimens were taken to test the corrosion rate, and the average value of the three specimens was recorded as the result in Table 3, wherein the uniform corrosion conditions were a total test pressure of 15MPa, CO 2 The partial pressure is 7.6MPa, H 2 The S partial pressure was 1.0MPa and the test temperature was 160 ℃.
Table 2 solution treatment process and mechanical properties test results for austenitic stainless steel pipe blanks in examples 3 to 5
TABLE 3 pitting and Uniform corrosion Performance of Austenitic stainless Steel tubing in examples 3-5
As can be seen from table 2: after the chemical components are treated by a proper solution process, the austenitic stainless steel oil pipe has the yield strength of 765-875 MPa, the tensile strength of 930-10200 MPa, the elongation of 40-55%, the full-size transverse impact power of 115-134J at minus 10 ℃ and the full-size longitudinal impact power of 137J-156J at minus 10 ℃, so that the product has excellent toughness matching, and can completely meet the service performance requirement of P110 steel grade petroleum oil pipes.
As can be seen from table 3: the austenitic stainless steel oil pipe produced by the invention adopts FeCl according to ASTM G48 standard 3 The solution is soaked for 168 hours, the test temperature is 50 ℃, and the average corrosion rate after the test is less than 0.6mm/a. At a total test pressure of 15MPa and CO 2 The partial pressure is 7.6MPa, H 2 The S partial pressure is 1.0MPa, the average corrosion rate is less than 0.01mm/a at the test temperature of 160 ℃, and the corrosion resistance of the product is excellent, so that the product can be applied to the severe service conditions of acid oil gas wells containing complex corrosive media such as hydrogen sulfide, carbon dioxide, chloride ions and the like.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (9)
1. An austenitic stainless steel oil pipe for an acid corrosion oil and gas well is characterized in that: the oil pipe comprises the following chemical element components in percentage by weight: c is less than or equal to 0.03 percent, si:0.15% -0.3%, P: less than or equal to 0.010 percent, S: less than or equal to 0.005 percent, cr:20.0% -24.0%, mn:14.0% -20%, ni:5.0% -10.0%, mo:3.0% -5.0%, cu:0.25% -0.50%, N:0.4% -0.6%, V: less than or equal to 0.1 percent, nb: less than or equal to 0.1 percent, ca is 0.001 to 0.003 percent, re: 0.01-0.03%, and the balance being Fe and unavoidable impurities.
2. A method of processing an austenitic stainless steel tubing for acid etched oil and gas wells according to claim 1, wherein: the method comprises the following steps:
s1: preparing an austenitic stainless steel cast ingot: adding aluminum or silicon steel deoxidizer into micro-carbon ferrochrome, manganese metal, ferronickel alloy, ferromolybdenum and industrial pure iron serving as raw materials under the nitrogen protection atmosphere of 0.1-0.5 MPa, smelting by adopting a vacuum induction furnace, adding nitriding alloy when the smelting temperature is controlled within the range of 1500-1550 ℃, and then performing nitrogen protection casting at the casting temperature within the range of 1450-1480 ℃ to prepare an austenitic stainless steel cast ingot;
s2: electroslag remelting: preparing an austenitic stainless steel cast ingot into a consumable electrode for electroslag remelting, carrying out electroslag remelting under the protection of nitrogen, selecting a corresponding slag system in the electroslag remelting process, deoxidizing by adopting Si or Ca, and carrying out nondestructive inspection and inclusion analysis after the electroslag remelting;
s3: forging austenitic stainless steel cast ingot: forging an austenitic stainless steel cast ingot after electroslag remelting, wherein the austenitic stainless steel cast ingot is heated at 1200-1250 ℃ for 2-3 hours, forging an austenitic stainless steel cast ingot with the diameter of 300-350 mm into a steel ingot with the diameter of 200-220 mm, and controlling the final forging temperature to be not lower than 1050 ℃;
s4: and (3) pipe manufacturing: preparing a forged austenitic stainless steel cast ingot into a blank pierced blank of an oil pipe by a hot extrusion mode, preparing an oil pipe blank of a required specification by adopting a multi-pass cold rolling mode, and obtaining a finished oil pipe blank of an austenitic structure through solution treatment of a whole pipe body, wherein annealing is carried out among cold rolling passes;
s5: and carrying out nondestructive inspection on the tube blank of the finished oil tube, and carrying out tube end threading, coupling screwing, hydrostatic test, protection ring feeding, mark spraying and painting after the inspection is qualified to prepare the finished oil tube.
3. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: and after the preparation of the austenitic stainless steel cast ingot in the step S1 is finished, performing element analysis, flaw detection and machining treatment on the austenitic stainless steel cast ingot, and removing surface defects and black skin.
4. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: the pitting equivalent value PREN of the austenitic stainless steel casting ingot material in the step S1 is more than or equal to 40.
5. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: in the S4 pipe making process, the austenitic stainless steel blank pipe is subjected to 5-pass cold rolling reduction, wherein the reduction ratio of the first 3 passes is 18% -25%, the reduction ratio of the fourth pass is 5% -10%, and the reduction ratio of the fourth pass is 10% -15%.
6. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: in the S4 pipe making process, the temperature is controlled to be within the range of 450-550 ℃ during the cold rolling of the austenitic stainless steel blank pierced billet, and the annealing temperature between cold rolling passes is within the range of 650-700 ℃ for 1-3 hours.
7. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: in the S4 pipe making process, the heat treatment parameters of the pipe blank solution treatment are as follows: the temperature is higher than 1100 ℃ for more than 4 hours, and the air cooling is carried out to the room temperature.
8. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: in the S4 pipe making process, the structure form of the finished oil pipe blank after the pipe blank is subjected to solution treatment is an austenite structure, and the delta phase content is less than 3%.
9. The method for processing the austenitic stainless steel oil pipe for the acid corrosion oil and gas well, according to claim 2, wherein the method comprises the following steps of: in the S4 pipe making process, the yield strength of the processed pipe blank of the oil pipe is 760-780 MPa, the tensile strength is 900-1050MPa, the elongation is more than or equal to 40%, the full-size transverse impact energy at-10 ℃ is more than or equal to 110J, and the full-size longitudinal impact energy is more than or equal to 130J.
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