CN111471926A - Pipe joint and preparation method thereof - Google Patents
Pipe joint and preparation method thereof Download PDFInfo
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- CN111471926A CN111471926A CN202010273357.2A CN202010273357A CN111471926A CN 111471926 A CN111471926 A CN 111471926A CN 202010273357 A CN202010273357 A CN 202010273357A CN 111471926 A CN111471926 A CN 111471926A
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- 238000002360 preparation method Methods 0.000 title claims description 9
- 238000005242 forging Methods 0.000 claims abstract description 64
- 238000010438 heat treatment Methods 0.000 claims abstract description 36
- 238000010791 quenching Methods 0.000 claims abstract description 29
- 230000000171 quenching effect Effects 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 27
- 238000005496 tempering Methods 0.000 claims abstract description 24
- 239000012535 impurity Substances 0.000 claims abstract description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052802 copper Inorganic materials 0.000 claims abstract description 13
- 239000010949 copper Substances 0.000 claims abstract description 13
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 13
- 239000010955 niobium Substances 0.000 claims abstract description 13
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 13
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000011651 chromium Substances 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 8
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 8
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims abstract description 8
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 8
- 239000011733 molybdenum Substances 0.000 claims abstract description 8
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 8
- 239000011574 phosphorus Substances 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 8
- 239000010703 silicon Substances 0.000 claims abstract description 8
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 8
- 239000011593 sulfur Substances 0.000 claims abstract description 8
- 238000004321 preservation Methods 0.000 claims description 26
- 238000001816 cooling Methods 0.000 claims description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 238000003723 Smelting Methods 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 238000005266 casting Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 5
- 150000002431 hydrogen Chemical class 0.000 claims description 5
- 238000009847 ladle furnace Methods 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000009849 vacuum degassing Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 15
- 239000010959 steel Substances 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 5
- 238000005260 corrosion Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 3
- 238000001556 precipitation Methods 0.000 abstract description 3
- 238000005728 strengthening Methods 0.000 abstract description 3
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 238000005553 drilling Methods 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 239000000956 alloy Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 239000011572 manganese Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 241000191291 Abies alba Species 0.000 description 1
- 229910019932 CrNiMo Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—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
- C21D9/085—Cooling or quenching
-
- 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
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- 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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a pipe joint, which comprises the following chemical components in percentage by weight: 0.27 to 0.34 percent of carbon, 0.66 to 1.09 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.13 to 0.37 percent of silicon, 0.72 to 0.93 percent of nickel, 0.81 to 1.09 percent of chromium, 0.33 to 0.47 percent of molybdenum, 0.01 to 0.031 percent of aluminum, 0.015 to 0.035 percent of niobium, 0.03 to 0.06 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities. According to the invention, by reasonably controlling the use amount of each component, the components are mutually promoted in a synergistic manner, the strength and plasticity of the material are improved, and the low-temperature impact resistance of the forging is improved; by adopting the heat treatment process after forging and the heat treatment process of quenching and tempering, the precipitation strengthening phase is refined, the corrosion resistance of the steel is improved, and the low-temperature impact resistance of the forging is further improved.
Description
Technical Field
The invention relates to the technical field of oil and gas forge piece production, in particular to a pipe joint and a preparation method thereof.
Background
At present, the Christmas tree pipe joint is mainly forged by AISI8630(30 CrNiMo). The 30CrNiMo is typical quenched and tempered steel which has high yield strength, tensile strength and fatigue strength, good shaping and toughness and good comprehensive performance. The 30CrNiMo has wide application, is mainly used for high-pressure chemical containers with high pressure and frequent fluctuation, and is also used for pressure pipelines, plastic molds, important components and the like. Because the pipe joint has strict requirements on the purity, the tissue compactness and the component uniformity of 30CrNiMo, particularly the deep sea environment is severe, and deep sea oil extraction has strict requirements on the strength, the low-temperature impact performance and the corrosion resistance of a large-caliber pipe joint, the existing pipe joint forged by 30CrNiMo cannot meet the requirements of users, so that the used deep sea oil extraction pipe joint needs to depend on an inlet, and a pipe joint and a preparation method thereof are urgently needed to meet the requirements of the users.
Disclosure of Invention
In view of the above prior art, the present invention provides a pipe joint and a method for manufacturing the same. According to the invention, by reasonably controlling the use amount of each component, the components are mutually promoted in a synergistic manner, the strength and plasticity of the material are improved, and the low-temperature impact resistance of the forging is improved; by adopting the heat treatment process after forging and the heat treatment process of quenching and tempering, the precipitation strengthening phase is refined, the corrosion resistance of the steel is improved, and the low-temperature impact resistance of the forging is further improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a pipe joint, which comprises the following chemical components in percentage by weight: 0.27 to 0.34 percent of carbon, 0.66 to 1.09 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.13 to 0.37 percent of silicon, 0.72 to 0.93 percent of nickel, 0.81 to 1.09 percent of chromium, 0.33 to 0.47 percent of molybdenum, 0.01 to 0.031 percent of aluminum, 0.015 to 0.035 percent of niobium, 0.03 to 0.06 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities.
Preferably, the chemical components and weight percentage are as follows: 0.28 to 0.33 percent of carbon, 0.70 to 1.05 percent of manganese, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 0.15 to 0.35 percent of silicon, 0.75 to 0.90 percent of nickel, 0.85 to 1.05 percent of chromium, 0.35 to 0.45 percent of molybdenum, 0.015 to 0.030 percent of aluminum, 0.015 to 0.035 percent of niobium, 0.03 to 0.05 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities.
Cr is an important element in the steel, Cr carbide formed by Cr and C is the smallest of all carbides, can be uniformly distributed in the steel volume, so that the steel has high strength, hardness, yield point and high wear resistance, the Cr content is 0.85-1.05%, the steel belongs to low-alloy high-strength steel, the alloy content of the steel is low, the manufacturing cost is low, the steel has high strength, high wear resistance, good fatigue resistance and hardenability, and the heat treatment is simple and convenient.
The beneficial effect of Mn is to improve the strength and wear resistance of the steel, the content of the steel is controlled to be 0.70-1.05%, and the Mn is mainly used as a deoxidizer for steelmaking.
Ni can improve the strength and toughness of steel and optimize the hardenability and corrosion resistance of the steel.
Preferably, the total amount of copper, niobium, aluminum, vanadium and inevitable impurities is 1.00% or less.
Preferably, the inevitable impurities comprise nitrogen, oxygen and hydrogen, wherein the nitrogen is less than or equal to 100ppm, the oxygen is less than or equal to 30ppm, and the hydrogen is less than or equal to 1.6 ppm. The content of harmful elements such as H, O and the like is reasonably controlled, and the low-temperature impact resistance of the forging is further improved.
In a second aspect of the present invention, there is provided a method for manufacturing the above pipe joint, comprising the steps of:
(1) smelting and casting;
(2) forging; the initial forging temperature is less than or equal to 1250 ℃, and the final forging temperature is greater than or equal to 750 ℃;
adopting a free forging forming process, firstly drilling a clamp handle to file the bottom, secondly chamfering by adopting an FM forging method, adopting an upper flat anvil lower platform as a forging tool, thirdly increasing the forging ratio of a pipe nozzle by adopting a forming die forming method, and simultaneously drawing out the pipe body;
through the reasonable forging process, the forging ratio of the last fire nozzle is increased by using the tool auxiliary tool, and the quality of the forged piece is improved.
(3) Heat treatment after forging; firstly, cooling the forging to 600-;
(4) performing heat treatment; comprises quenching treatment and tempering treatment, wherein the initial quenching temperature is less than or equal to 300 ℃, the temperature is increased to 830-899 ℃ at the temperature rising speed of less than or equal to 150 ℃/h for quenching treatment, then the temperature is cooled to 204 ℃ at the temperature, and the temperature is increased to 660-720 ℃ at the temperature rising speed of less than or equal to 150 ℃/h for tempering treatment.
Preferably, in the step (1), the smelting and casting comprises electric furnace smelting, ladle furnace refining, vacuum pouring, vacuum degassing and electroslag remelting.
Preferably, in the step (2), the forging is carried out freely by using a hydraulic press, and the hydraulic press is a 10000 ton hydraulic press.
Preferably, in the step (2), the forging ratio is more than or equal to 5. The forging ratio is matched with proper initial forging temperature and final forging temperature, so that the defects that crystal grains are thick and large, the mechanical property does not reach the standard, forging cracks and the like are easily generated in the forging process of the forging piece, and the quality of the forging piece is improved.
Preferably, in the step (3), the time of the first heat preservation treatment is 10-14h, the time of the second heat preservation treatment is 16-20h, the time of the third heat preservation treatment is 14-18h, the time of the fourth heat preservation treatment is 16-20h, and the time of the fifth heat preservation treatment is 38-42 h.
Preferably, in the step (4), the quenching treatment and the tempering treatment time are determined according to the diameter of the forged piece, the quenching treatment time is not less than 1h/50mm, 50mm is the diameter of the forged piece, the tempering treatment time is not less than 1h/25mm, and 25mm is the diameter of the forged piece. When the diameter of the forging is 100mm, the quenching treatment time is not less than 2h, and the tempering treatment time is not less than 4 h.
Preferably, in step (4), the performance heat treatment is performed in a hood-type electric resistance furnace.
The invention has the beneficial effects that:
1. according to the invention, by reasonably controlling the use amount of each component, the components are mutually promoted in a synergistic manner, the strength and plasticity of the material are improved, and the low-temperature impact resistance of the forging is improved; by adopting the heat treatment process after forging and the heat treatment process of quenching and tempering, the precipitation strengthening phase is refined, the corrosion resistance of the steel is improved, and the low-temperature impact resistance of the forging is further improved.
2. Through the matching of the components and the preparation method, the prepared pipe joint has the tensile strength of more than or equal to 700MPa, the yield strength of more than or equal to 560MPa, the elongation after fracture of more than or equal to 20 percent, the three-way low-temperature impact average value of more than or equal to 50J, and the Brinell hardness of more than or equal to 210, and the performance indexes are completely higher than the technical requirements of deep-sea oil and gas connecting nozzles.
Drawings
FIG. 1 is a schematic structural view of a pipe joint according to the present invention;
FIG. 2 is a schematic flow diagram of the post-forging heat treatment of the present invention;
FIG. 3 is a schematic flow chart of the heat treatment for performance of the present invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. 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 application belongs.
Example 1:
a pipe joint comprises the following chemical components in percentage by weight: 0.27% of carbon, 0.66% of manganese, less than or equal to 0.020% of phosphorus, less than or equal to 0.015% of sulfur, 0.13% of silicon, 0.72% of nickel, 0.81% of chromium, 0.33% of molybdenum, 0.01% of aluminum, 0.015% of niobium, 0.03% of vanadium, less than or equal to 0.15% of copper, and the balance of iron and inevitable impurities. The total amount of copper, niobium, aluminum, vanadium and inevitable impurities is less than or equal to 1.00 percent, and the inevitable impurities comprise nitrogen, oxygen and hydrogen, wherein the nitrogen is less than or equal to 100ppm, the oxygen is less than or equal to 30ppm, and the hydrogen is less than or equal to 1.6 ppm.
The preparation method of the pipe joint comprises the following steps:
(1) smelting and casting, namely adopting electric furnace smelting, ladle furnace refining, vacuum pouring, vacuum degassing and electroslag remelting;
(2) forging; freely forging by adopting a 10000-ton hydraulic press, wherein the initial forging temperature is 1250 ℃, the final forging temperature is 750 ℃, and the forging ratio is 5; firstly, drilling a clamp handle and filing a bottom, secondly, chamfering by adopting an FM forging method, adopting a forging tool as an upper flat anvil lower platform, thirdly, increasing the forging ratio of a pipe nozzle by adopting a forming method, and simultaneously drawing out a pipe body;
(3) heat treatment after forging; firstly, carrying out first heat preservation treatment at 600 ℃, wherein the treatment time is 14h, cooling to 300 ℃ at a cooling rate of 30 ℃/h for second heat preservation treatment, the treatment time is 20h, heating to 870 ℃ at a heating rate of 50 ℃/h for third heat preservation treatment, the treatment time is 18h, placing in air, cooling to 300 ℃ for fourth heat preservation treatment, the treatment time is 20h, heating to 670 ℃ at a heating rate of 50 ℃/h for fifth heat preservation treatment, the treatment time is 42h, cooling to 400 ℃ at a cooling rate of 30 ℃/h, and then cooling to 250 ℃ at a cooling rate of 15 ℃/h;
(4) performing heat treatment; the method comprises quenching treatment and tempering treatment, wherein the quenching treatment and the tempering treatment are carried out in a cover type resistance furnace, the initial quenching temperature is less than or equal to 300 ℃, the temperature is increased to 830-minus 899 ℃ at the heating rate of 150 ℃/h for quenching treatment, then the water is cooled to the temperature of less than or equal to 204 ℃, then the temperature is increased to 660-minus 720 ℃ at the heating rate of 150 ℃/h for tempering treatment, the quenching treatment is not less than 1h, and the tempering treatment time is not less than 2 h.
Example 2:
a pipe joint comprises the following chemical components in percentage by weight: 0.34 percent of carbon, 1.09 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.37 percent of silicon, 0.93 percent of nickel, 1.09 percent of chromium, 0.47 percent of molybdenum, 0.031 percent of aluminum, 0.035 percent of niobium, 0.06 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities. The total amount of copper, niobium, aluminum, vanadium and inevitable impurities is less than or equal to 1.00 percent, and the inevitable impurities comprise nitrogen, oxygen and hydrogen, wherein the nitrogen is less than or equal to 100ppm, the oxygen is less than or equal to 30ppm, and the hydrogen is less than or equal to 1.6 ppm.
The preparation method of the pipe joint comprises the following steps:
(1) smelting and casting, namely adopting electric furnace smelting, ladle furnace refining, vacuum pouring, vacuum degassing and electroslag remelting;
(2) forging; freely forging by adopting a 10000-ton hydraulic press, wherein the initial forging temperature is 1200 ℃, the final forging temperature is 800 ℃, and the forging ratio is 5; firstly, drilling a clamp handle and filing a bottom, secondly, chamfering by adopting an FM forging method, adopting a forging tool as an upper flat anvil lower platform, thirdly, increasing the forging ratio of a pipe nozzle by adopting a forming method, and simultaneously drawing out a pipe body;
(3) heat treatment after forging; firstly, carrying out first heat preservation treatment at 650 ℃, wherein the treatment time is 10h, cooling to 350 ℃ at a cooling rate of 25 ℃/h for carrying out second heat preservation treatment, the treatment time is 16h, heating to 890 ℃ at a heating rate of 45 ℃/h for carrying out third heat preservation treatment, the treatment time is 14h, placing in air, cooling to 350 ℃ for carrying out fourth heat preservation treatment, the treatment time is 16h, heating to 690 ℃ at a heating rate of 45 ℃/h for carrying out fifth heat preservation treatment, the treatment time is 38h, cooling to 400 ℃ at a cooling rate of 25 ℃/h, and then cooling to 250 ℃ at a cooling rate of 10 ℃/h;
(4) performing heat treatment; the method comprises quenching treatment and tempering treatment, wherein the quenching treatment and the tempering treatment are carried out in a cover type resistance furnace, the initial quenching temperature is less than or equal to 300 ℃, the temperature is increased to 830-minus 899 ℃ at the temperature rising speed of 140 ℃/h for quenching treatment, then the water is cooled to the temperature of less than or equal to 204 ℃, then the temperature is increased to 660-minus 720 ℃ at the temperature rising speed of 140 ℃/h for tempering treatment, the quenching treatment is not less than 1h, and the tempering treatment time is not less than 2 h.
Example 3:
a pipe joint comprises the following chemical components in percentage by weight: 0.30 percent of carbon, 0.88 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.23 percent of silicon, 0.80 percent of nickel, 0.90 percent of chromium, 0.40 percent of molybdenum, 0.020 percent of aluminum, 0.022 percent of niobium, 0.04 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities. The total amount of copper, niobium, aluminum, vanadium and inevitable impurities is less than or equal to 1.00 percent, and the inevitable impurities comprise nitrogen, oxygen and hydrogen, wherein the nitrogen is less than or equal to 100ppm, the oxygen is less than or equal to 30ppm, and the hydrogen is less than or equal to 1.6 ppm.
The preparation method of the pipe joint comprises the following steps:
(1) smelting and casting, namely adopting electric furnace smelting, ladle furnace refining, vacuum pouring, vacuum degassing and electroslag remelting;
(2) forging; freely forging by adopting a 10000-ton hydraulic press, wherein the initial forging temperature is 1250 ℃, the final forging temperature is 750 ℃, and the forging ratio is 5; firstly, drilling a clamp handle and filing a bottom, secondly, chamfering by adopting an FM forging method, adopting a forging tool as an upper flat anvil lower platform, thirdly, increasing the forging ratio of a pipe nozzle by adopting a forming method, and simultaneously drawing out a pipe body;
(3) heat treatment after forging; firstly, carrying out primary heat preservation treatment at 630 ℃ for 12h, cooling to 330 ℃ at a cooling rate of 30 ℃/h for secondary heat preservation treatment, wherein the treatment time is 18h, heating to 880 ℃ at a heating rate of 50 ℃/h for carrying out tertiary heat preservation treatment, the treatment time is 16h, placing in air, cooling to 330 ℃ for carrying out fourth heat preservation treatment, the treatment time is 18h, heating to 680 ℃ at a heating rate of 50 ℃/h for carrying out fifth heat preservation treatment, the treatment time is 40h, cooling to 400 ℃ at a cooling rate of 30 ℃/h, and then cooling to 250 ℃ at a cooling rate of 15 ℃/h;
(4) performing heat treatment; the method comprises quenching treatment and tempering treatment, wherein the quenching treatment and the tempering treatment are carried out in a cover type resistance furnace, the initial quenching temperature is less than or equal to 300 ℃, the temperature is increased to 830-minus 899 ℃ at the heating rate of 150 ℃/h for quenching treatment, then the temperature is cooled to be less than or equal to 204 ℃, then the temperature is increased to 660-minus 720 ℃ at the heating rate of 150 ℃/h for tempering treatment, the quenching treatment is not less than 1h, and the tempering treatment time is not less than 2 h.
The pipe joints prepared in the above examples 1 to 3 were subjected to performance tests:
tensile test and impact test, the test method adopts ASTM A370, the impact test is measured at the temperature of-30 ℃;
hardness test using ASTM E10;
tower test, the test method adopts GB/T15711;
the results of the tests of examples 1-3 are not significantly different, wherein the performance of example 3 is the best, and the results of the tests of the pipe joint prepared in example 3 are shown in the following tables 1 and 2.
Table 1:
table 2:
as can be seen from tables 1 and 2, the pipe joint manufactured according to the present invention can fully satisfy the requirements of the technical conditions, and the pipe joint manufactured according to the present invention can replace imported products.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A pipe joint is characterized by comprising the following chemical components in percentage by weight: 0.27 to 0.34 percent of carbon, 0.66 to 1.09 percent of manganese, less than or equal to 0.020 percent of phosphorus, less than or equal to 0.015 percent of sulfur, 0.13 to 0.37 percent of silicon, 0.72 to 0.93 percent of nickel, 0.81 to 1.09 percent of chromium, 0.33 to 0.47 percent of molybdenum, 0.01 to 0.031 percent of aluminum, 0.015 to 0.035 percent of niobium, 0.03 to 0.06 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities.
2. The pipe joint according to claim 1, wherein the chemical composition and weight percentage are: 0.28 to 0.33 percent of carbon, 0.70 to 1.05 percent of manganese, less than or equal to 0.015 percent of phosphorus, less than or equal to 0.010 percent of sulfur, 0.15 to 0.35 percent of silicon, 0.75 to 0.90 percent of nickel, 0.85 to 1.05 percent of chromium, 0.35 to 0.45 percent of molybdenum, 0.015 to 0.030 percent of aluminum, 0.015 to 0.035 percent of niobium, 0.03 to 0.05 percent of vanadium, less than or equal to 0.15 percent of copper, and the balance of iron and inevitable impurities.
3. The pipe joint according to claim 1 or 2, wherein the total amount of copper, niobium, aluminum, vanadium and inevitable impurities is less than or equal to 1.00%.
4. The pipe joint according to claim 3, wherein the inevitable impurities include nitrogen, oxygen, and hydrogen, wherein nitrogen is 100ppm or less, oxygen is 30ppm or less, and hydrogen is 1.6ppm or less.
5. A method for manufacturing a pipe joint according to any of claims 1 to 4, comprising the steps of:
(1) smelting and casting;
(2) forging; the initial forging temperature is less than or equal to 1250 ℃, and the final forging temperature is greater than or equal to 850 ℃;
(3) heat treatment after forging; firstly, performing first heat preservation treatment at the temperature of 600-;
(4) performing heat treatment; comprises quenching treatment and tempering treatment, wherein the initial quenching temperature is less than or equal to 300 ℃, the temperature is raised to 830-899 ℃ for quenching treatment, then the water cooling is carried out until the temperature is less than or equal to 204 ℃, and the temperature is raised to 660-720 ℃ for tempering treatment.
6. The method according to claim 5, wherein in the step (1), the smelting and casting comprises electric furnace smelting, ladle furnace refining, vacuum casting, vacuum degassing and electroslag remelting.
7. The method of claim 5, wherein in step (2), the forging ratio is 5 or more.
8. The method according to claim 5, wherein in the step (3), the time of the first heat-preservation treatment is 10-14h, the time of the second heat-preservation treatment is 16-20h, the time of the third heat-preservation treatment is 14-18h, the time of the fourth heat-preservation treatment is 16-20h, and the time of the fifth heat-preservation treatment is 38-42 h.
9. The method according to claim 5, wherein in the step (4), the quenching treatment and the tempering treatment are determined according to the diameter of the forged piece, the quenching treatment time is not less than 1h/50mm, 50mm is the diameter of the forged piece, the tempering treatment time is not less than 1h/25mm, and 25mm is the diameter of the forged piece.
10. Use of the pipe joint according to any of claims 1-4 for the preparation of a deep sea production string.
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