WO2020034050A1 - High-frequency induction welded high alloy anti-corrosion coiled tubing and preparation method therefor - Google Patents

High-frequency induction welded high alloy anti-corrosion coiled tubing and preparation method therefor Download PDF

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WO2020034050A1
WO2020034050A1 PCT/CN2018/095771 CN2018095771W WO2020034050A1 WO 2020034050 A1 WO2020034050 A1 WO 2020034050A1 CN 2018095771 W CN2018095771 W CN 2018095771W WO 2020034050 A1 WO2020034050 A1 WO 2020034050A1
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Prior art keywords
coiled tubing
welding
steel
frequency induction
resistant
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PCT/CN2018/095771
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French (fr)
Chinese (zh)
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陈化顺
蔡孝井
林旭
任成军
王泰
徐常富
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杰森能源技术有限公司
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Priority to PCT/CN2018/095771 priority Critical patent/WO2020034050A1/en
Publication of WO2020034050A1 publication Critical patent/WO2020034050A1/en

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    • 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
    • B21C37/08—Making tubes with welded or soldered seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K13/00—Welding by high-frequency current heating
    • B23K13/01—Welding by high-frequency current heating by induction heating
    • B23K13/02—Seam welding
    • 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
    • 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

Definitions

  • the invention belongs to the technical field of pipes for terrestrial and offshore oil and gas wells, and relates to a high-frequency induction welding high alloy corrosion-resistant coiled tubing and a preparation method thereof.
  • Coiled tubing is different from conventional screw-connected tubing. It is a single, multi-kilometer-long, unconnected tubing wound on a drum that can be continuously run down or lifted out. Coiled tubing technology is currently a relatively advanced technology in the world. Due to its low operating costs, simplicity, time saving, safety and reliability, it is widely used in sand washing, well washing, logging, completion, drilling and other fields. .
  • a patent discloses a method for manufacturing a duplex stainless steel coiled tubing, which uses laser welding of duplex stainless steel.
  • the disadvantage of this technology is that the welding efficiency is very low (the welding speed is about 1.5m / min). For coiled tubing up to several kilometers, continuous welding is required for several days. There are aspects such as production efficiency and welding quality stability. Very big problem; Secondly, due to the limitation of the power of the welding machine, laser welding is mostly used for welding thin-walled tubes and capillaries, but it is difficult to manufacture thick-walled, large-diameter high-strength, high-fatigue-life coiled tubing.
  • the high-frequency induction welding technology heats the edge of the steel strip by induction current, and forms a weld seam by the welding squeeze roller.
  • the welding speed is fast, the heat input is small, and the oxide inclusions are discharged after extrusion, which can obtain good welding quality.
  • High-frequency induction welding technology has been used for decades in conventional low-carbon alloy steel pipe manufacturing because of its stable and reliable weld quality and high production efficiency. However, due to the high technical difficulty, no public report on high frequency induction welding of high alloy duplex stainless steel has been found so far.
  • the present invention provides a high-frequency induction welding high-alloy corrosion-resistant coiled tubing and a preparation method thereof.
  • the production efficiency is high, the fatigue life is good, and the corrosion resistance is strong. Optimized to achieve welding of high alloy duplex stainless steel.
  • a high-frequency induction welding high-alloy corrosion-resistant coiled tubing is a duplex stainless steel coiled tubing.
  • the duplex stainless steel coiled tubing is ferritic and austenitic duplex stainless steel.
  • the ferrite content is 35% -55%.
  • the alloying elements of the duplex stainless steel coiled tubing include the following components and components in terms of mass fraction: C ⁇ 0.03%, Mn ⁇ 2.5%, P ⁇ 0.03%, S ⁇ 0.005%, Si ⁇ 1.0%, Cr 22.0% -30.0%, Mo 1.5% -5.0%, Ni 4.5% -8.0%, N 0.14% -0.40%, Fe balance.
  • the above dual-phase stainless steel material is a ferrite + austenite two-phase structure, in which the ferrite content should be controlled in the range of 35% to 55% to obtain good welding processability and corrosion resistance.
  • the raw material of the coiled tubing is pickled steel coils after hot rolling and solution treatment, and the steel coils are first smelted through an EAF AC electric arc furnace before hot rolling, and then subjected to AOD argon oxygen. Decarburization or VOD vacuum arc furnace refining, effectively control the content of impurity elements such as P and S.
  • the preparation method of the high-frequency induction welding high-alloy corrosion-resistant coiled tubing includes the following steps:
  • the steel strips are extended by butt welding.
  • the steel strips must be protected by inert gas, and plasma or argon arc welding (TIG / MIG) is used.
  • TIG / MIG plasma or argon arc welding
  • the welding process needs to fill the welding wire with a higher Ni content than the base metal to prevent the austenite content of the weld from reducing or forming a single ferrite structure to affect its corrosion resistance.
  • the inert gas is argon or nitrogen;
  • the inert gas (argon or nitrogen) is used to protect the weld.
  • the inert gas protection needs to fully cover the heated area of the steel strip edge (shown as L in Figure 2). Squeeze by the squeeze roller can completely avoid the occurrence of weld inclusions.
  • the total length required for the pipe is reached, and then several kilometers of steel belts are transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit; considering the composition and performance of the duplex stainless steel material, Select tool steel rolls, high-speed steel rolls or copper rolls, etc. to obtain good coiled tubing surface quality.
  • the welding machine power is 100-360KW
  • the welding speed is 15-50m / min
  • the high-frequency induction welding of high-alloy corrosion-resistant coiled tubing is continuously completed;
  • the welding seam is heated to 1050-1150 ° C by induction heating equipment, and the water is rapidly cooled after holding for 1-10 minutes to improve the structure of the weld seam.
  • the sizing unit After the sizing unit obtains the required outer diameter dimensions, after the sizing is completed, the high-frequency induction welding high alloy corrosion-resistant coiled tubing passes through a heat treatment system, the whole pipe is heated to 1080-1150 ° C, and it enters the cooling water system quickly after holding for 1-10 minutes. The product was obtained after rapid cooling.
  • the butt welding of the steel strip is completed, it is heated to 1020-1120 ° C, and after being held for 1-10 minutes, it is quickly sprayed with water for cooling. To further optimize the weld structure and improve corrosion resistance.
  • the invention prepares a high-frequency induction welding high-alloy corrosion-resistant coiled tubing, which can obtain a minimum yield strength of 552Mpa, a minimum tensile strength of 758Mpa, a minimum plastic elongation of 25%, and a maximum hardness of 30HRC. Coiled tubing.
  • the coiled tubing has a relatively high alloy element content, which can meet the application of high pressure, high CO 2 and H 2 S corrosion environments.
  • High-frequency induction welding is adopted, with high welding efficiency, and the production speed can reach more than 10 times that of conventional laser welding.
  • the invention innovates and optimizes the high-frequency welding process, and realizes the welding of high-alloy duplex stainless steel coiled tubing for the first time. Through two solution treatments, the entire pipe body can be guaranteed to have excellent structure, and the ferrite content in the weld, heat affected zone, and base metal is controlled between 35% and 55%, so that the coiled tubing has good resistance to uniformity. Corrosion, crevice corrosion and chloride stress corrosion capabilities.
  • the product prepared by the invention has high strength and good fatigue life, and its bending fatigue life can reach 3-5 times that of the conventional CT90 coupling pipe.
  • FIG. 1 is a schematic flow chart of a method for preparing a high-alloy corrosion-resistant coiled tubing by high-frequency induction welding
  • FIG. 2 is a schematic diagram of the control of the high-frequency induction welding coil and the V-shaped mouth of the product of the present invention
  • a high-frequency induction welding high-alloy corrosion-resistant coiled tubing is a duplex stainless steel coiled tubing
  • the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel
  • the duplex stainless steel coiled tubing according to quality
  • the score includes the following components and components: C 0.012%, Mn 1.1%, P 0.013%, S 0.002%, Si 0.55%, Cr 22.5%, Mo 3.2%, Ni 4.8%, N 0.17%, Fe balance. Smelting by EAF AC electric arc furnace, and then refining by VOD vacuum electric arc furnace.
  • a two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 35%.
  • a finished steel coil material with a wall thickness of 0.175in was obtained.
  • the steel coil is slit according to the outer diameter of the 2in continuous pipe. After milling, the edge of the steel strip is flat and smooth. The sickle of the steel strip is 0.2mm / m.
  • the steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding.
  • the welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance.
  • the steel strip is subjected to post-weld heat treatment after the butt-welding is completed. The specific process is that after heating to 1080 ° C. for 1 minute, the water is rapidly sprayed for cooling.
  • the steel belt is extended to 3500m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit.
  • high-carbon, high-alloy tool steel rolls are selected. Nitrogen is used to protect the weld seam.
  • the gas shield fully covers the heated area of the edge of the steel strip (shown as L in Figure 2), and cooperates with the extrusion of the welding squeeze roller to avoid the occurrence of weld inclusions.
  • the gap between the induction coil and the connecting pipe shown as t in FIG. 2) is 5mm
  • the welding V-shaped port angle shown as ⁇ in FIG. 2 is 6 °.
  • the welding machine power to 230KW and the welding speed of 30m / min to complete the welding of stainless steel tubing continuously.
  • a solution treatment is required. Specifically, the welding seam is heated to 1100 ° C by an induction heating device, and the water is rapidly cooled after being held for 2 minutes to improve the structure of the weld seam.
  • the coiled tubing is passed through a sizing unit to obtain the required outer diameter of 50.8 ⁇ 0.25mm. After the sizing is completed, the coiled tubing passes through a heat treatment system, and the entire tube is heated to 1120 ° C. After 3 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.
  • a high-frequency induction welding high-alloy corrosion-resistant coiled tubing is a duplex stainless steel coiled tubing
  • the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel
  • the duplex stainless steel coiled tubing according to quality In terms of scores, the following components and components are included: C 0.01%, Mn 1.25%, P 0.017%, 0.002%, Si 0.36%, Cr 25%, Mo 4.5%, Ni 8.0%, N 0.26%, and Fe balance. It is smelted by EAF AC electric arc furnace, and then refined by AOD argon-oxygen decarburization.
  • a two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 55%.
  • a finished steel coil material with a wall thickness of 0.156 inches was obtained.
  • the steel coil is slitted according to the outer diameter of the 1.75-in. Pipe. After milling, the edge of the steel strip is flat and smooth, and the steel strip has a sickle bend of 0.2mm / m.
  • the steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding.
  • the welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance.
  • a post-weld heat treatment is performed after the butt welding of the steel strip is completed.
  • the specific process is that the steel strip is heated to 1100 ° C for 5 minutes, and then sprayed with water for cooling.
  • the steel belt is extended to 3000m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit.
  • a high-speed steel roll is selected. Nitrogen is used to protect the weld seam.
  • the gas shield fully covers the heated area of the edge of the steel strip (shown as L in Figure 2), and cooperates with the extrusion of the welding squeeze roller to avoid the occurrence of weld inclusions.
  • the gap between the induction coil and the connecting pipe shown as t in FIG. 2) is 5 mm
  • the welding V-shaped port angle shown as ⁇ in FIG. 2 is 7 °.
  • the welding machine power of 255KW and welding speed of 36m / min to complete the welding of stainless steel tubing continuously.
  • a solution treatment is required. Specifically, the welding seam is heated to 1100 ° C by an induction heating device, and the water is rapidly cooled after being held for 6 minutes to improve the structure of the weld seam.
  • the coiled tubing passes the sizing unit to obtain the required outer diameter of 44.5 ⁇ 0.25mm. After the sizing is completed, the coiled tubing passes through a heat treatment system, and the entire tube is heated to 1150 ° C. After 8 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.
  • a high-frequency induction welding high-alloy corrosion-resistant coiled tubing is a duplex stainless steel coiled tubing
  • the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel
  • the duplex stainless steel coiled tubing according to quality
  • the score includes the following composition and components: C 0.018%, Mn 0.96%, P 0.01%, S 0.002%, Si 0.45%, Cr 30.0%, Mo 1.5%, Ni 4.5 %%, N 0.4%, Fe balance . Smelting by EAF AC electric arc furnace, and then refining by VOD vacuum electric arc furnace.
  • a two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 45%.
  • a finished steel coil material with a wall thickness of 0.156 inches was obtained.
  • the steel coil is slit according to the outer diameter of the 2in continuous pipe. After milling, the edge of the steel strip is flat and smooth.
  • the sickle of the steel strip is 0.2mm / m.
  • the steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding.
  • the welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance.
  • the post-weld heat treatment is performed after the completion of the butt welding of the steel strip.
  • the specific process is that the steel strip is heated to 1070 ° C for 3 minutes, and then sprayed with water for cooling.
  • the steel belt is extended to 2700m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit.
  • high-carbon, high-alloy tool steel rolls are selected. Nitrogen is used to protect the weld seam, and the gas shield fully covers the heated area of the edge of the steel strip (as shown by L in Figure 2), and cooperates with the extrusion of the welding squeeze roller.
  • the gap between the induction coil and the connecting pipe shown as t in FIG. 2) is 5mm
  • the welding V-shaped port angle shown as ⁇ in FIG. 2 is 6 °.
  • the welding machine power to 180KW and the welding speed to 32m / min to complete the welding of stainless steel tubing continuously.
  • a solution treatment is required. Specifically, the welding seam is heated to 1080 ° C by an induction heating device, and the water is rapidly cooled after 10 minutes of heat preservation to improve the structure of the weld seam.
  • the coiled tubing is passed through a sizing unit to obtain the required outer diameter of 50.8 ⁇ 0.25mm. After the sizing is completed, the coiled tubing passes through the heat treatment system, and the entire pipe is heated to 1100 ° C. After 5 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.

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Abstract

Disclosed is a high-frequency induction welded high alloy anti-corrosion coiled tubing. The coiled tubing is a ferrite-austenite duplex stainless steel coiled tubing, having a metallographic structure with a content of ferrite of 35%-55%, and the coiled tubing has a higher content of an alloy element, and can meet requirements of an application in a high pressure, high CO2 and H2S corrosive environment. The product prepared has a high strength, and a good fatigue life, and the bending fatigue life thereof can reach 3-5 times that of a conventional CT90 coiled tubing.

Description

一种高频感应焊高合金耐腐蚀连续油管及其制备方法High-frequency induction welding high-alloy corrosion-resistant coiled tubing and preparation method thereof 技术领域Technical field
本发明属于陆地及海洋油气井用管材技术领域，涉及一种高频感应焊高合金耐腐蚀连续油管及其制备方法。The invention belongs to the technical field of pipes for terrestrial and offshore oil and gas wells, and relates to a high-frequency induction welding high alloy corrosion-resistant coiled tubing and a preparation method thereof.
背景技术Background technique
连续油管不同于常规螺纹连接的油管，其是一种缠绕在滚筒上，可连续下井或起出的单根长达数千米的无接头油管。连续油管技术是当前国际上较为先进的技术，由于其作业成本低、简单省时、安全可靠等优越性能，而被广泛应用于冲砂、洗井、测井、完井、钻井等多个领域。Coiled tubing is different from conventional screw-connected tubing. It is a single, multi-kilometer-long, unconnected tubing wound on a drum that can be continuously run down or lifted out. Coiled tubing technology is currently a relatively advanced technology in the world. Due to its low operating costs, simplicity, time saving, safety and reliability, it is widely used in sand washing, well washing, logging, completion, drilling and other fields. .
随着油气田的不断开发，含CO 2、H 2S、Cl -油井不断增多，连续油管的作业工况日益恶化。而现有的低碳低合金钢连续油管无论其为何种组织类型，因合金元素含量低、抗腐蚀性能较差，难以在高CO 2、H 2S的强腐蚀环境中应用。 With the continuous development of oil and gas fields, CO 2 , H 2 S, Cl - containing oil wells are increasing, and the operating conditions of coiled tubing are getting worse. Regardless of the existing type of low-carbon low-alloy steel coiled tubing, it is difficult to apply it in high-corrosive environments with high CO 2 and H 2 S due to its low alloy element content and poor corrosion resistance.
现有技术中，发现关于16Cr不锈钢连续油管的报道。其合金元素含量相对较低(Cr含量在17.0％以下、Ni含量最高仅为3.0％)，是往钢中加入Mn来替代贵重金属元素Ni而发展起来的一种铬-锰系低成本奥氏体不锈钢材料。因此，一般将其应用在耐蚀性要求不高的环境中，在高CO 2、H 2S的强腐蚀井况下，相对常规连续油管并无明显优势。 In the prior art, reports on 16Cr stainless steel coiled tubing have been found. Its alloy element content is relatively low (Cr content is less than 17.0%, and Ni content is only 3.0%). It is a low-cost chromium-manganese austenite developed by adding Mn to steel to replace the precious metal element Ni. Body stainless steel material. Therefore, it is generally applied in environments where corrosion resistance is not high, and under strong corrosion wells with high CO 2 and H 2 S, there is no obvious advantage over conventional coiled tubing.
另外，有专利公布了一种双相不锈钢连续油管的制造方法，其采用激光焊接双相不锈钢。该技术的缺点在于焊接效率极低(焊接速度约1.5m/min),对长达数千米的连续油管来讲，需要连续焊接长达数日，在生产效率、焊接质量稳定性等方面存在很大问题；其次，由于焊接机功率的限制，激光焊接多用于焊接薄壁管、毛细管，而难以进行厚壁、大管径高强度、高疲劳寿命连续油管的 制造。In addition, a patent discloses a method for manufacturing a duplex stainless steel coiled tubing, which uses laser welding of duplex stainless steel. The disadvantage of this technology is that the welding efficiency is very low (the welding speed is about 1.5m / min). For coiled tubing up to several kilometers, continuous welding is required for several days. There are aspects such as production efficiency and welding quality stability. Very big problem; Secondly, due to the limitation of the power of the welding machine, laser welding is mostly used for welding thin-walled tubes and capillaries, but it is difficult to manufacture thick-walled, large-diameter high-strength, high-fatigue-life coiled tubing.
高频感应焊接技术通过感应电流加热钢带边缘，并通过焊接挤压辊挤压形成焊缝，其焊接速度快、热输入小，经过挤压后氧化物夹杂被排出，可以得到良好的焊接质量。高频感应焊接技术由于其稳定可靠的焊缝质量、较高的生产效率，在常规低碳合金钢连管制造中已有长达数十年的良好应用历史。然而因技术难度较高，至今未发现高频感应焊接高合金双相不锈钢的公开报道。The high-frequency induction welding technology heats the edge of the steel strip by induction current, and forms a weld seam by the welding squeeze roller. The welding speed is fast, the heat input is small, and the oxide inclusions are discharged after extrusion, which can obtain good welding quality. . High-frequency induction welding technology has been used for decades in conventional low-carbon alloy steel pipe manufacturing because of its stable and reliable weld quality and high production efficiency. However, due to the high technical difficulty, no public report on high frequency induction welding of high alloy duplex stainless steel has been found so far.
发明内容Summary of the Invention
本发明为了克服上述技术问题的不足，提供了一种高频感应焊高合金耐腐蚀连续油管及其制备方法，生产效率高、疲劳寿命好、耐腐蚀性能强，通过对高频感应焊管工艺进行优化，实现了高合金双相不锈钢的焊接。In order to overcome the shortcomings of the above technical problems, the present invention provides a high-frequency induction welding high-alloy corrosion-resistant coiled tubing and a preparation method thereof. The production efficiency is high, the fatigue life is good, and the corrosion resistance is strong. Optimized to achieve welding of high alloy duplex stainless steel.
解决上述技术问题的技术方案如下：The technical solutions to the above technical problems are as follows:
一种高频感应焊高合金耐腐蚀连续油管，所述的连续油管为双相不锈钢连续油管，所述的双相不锈钢连续油管为铁素体和奥氏体双相不锈钢，其金相组织中铁素体含量为35％-55％，通过合理的化学成分配比及热处理工艺控制，将奥氏体不锈钢的优良韧性、焊接性及耐腐蚀性与铁素体不锈钢所具有的较高强度和耐氯化物应力腐蚀性能结合在一起，而兼有奥氏体钢和铁素体钢的优点，其同时具备较高的强度、疲劳寿命及优异的抗二氧化碳、硫化氢及氯化物应力腐蚀能力。A high-frequency induction welding high-alloy corrosion-resistant coiled tubing. The coiled tubing is a duplex stainless steel coiled tubing. The duplex stainless steel coiled tubing is ferritic and austenitic duplex stainless steel. The ferrite content is 35% -55%. Through reasonable chemical composition distribution and heat treatment process control, the excellent toughness, weldability and corrosion resistance of austenitic stainless steel and the higher strength and resistance of ferritic stainless steel Combined with chloride stress corrosion performance, it has the advantages of austenitic steel and ferritic steel. It also has high strength, fatigue life and excellent resistance to carbon dioxide, hydrogen sulfide and chloride stress corrosion.
所述的双相不锈钢连续油管的合金元素，按照质量分数计，包括以下组成与组分：C≤0.03％、Mn≤2.5％、P≤0.03％、S≤0.005％、Si≤1.0％、Cr 22.0％-30.0％、Mo 1.5％-5.0％、Ni 4.5％-8.0％、N 0.14％-0.40％、Fe余量。The alloying elements of the duplex stainless steel coiled tubing include the following components and components in terms of mass fraction: C≤0.03%, Mn≤2.5%, P≤0.03%, S≤0.005%, Si≤1.0%, Cr 22.0% -30.0%, Mo 1.5% -5.0%, Ni 4.5% -8.0%, N 0.14% -0.40%, Fe balance.
上述双相不锈钢材料为铁素体+奥氏体两相组织，其中铁素体含量应控制在 35％-55％的范围内，以获得良好的焊接工艺性和耐腐蚀性。The above dual-phase stainless steel material is a ferrite + austenite two-phase structure, in which the ferrite content should be controlled in the range of 35% to 55% to obtain good welding processability and corrosion resistance.
进一步地说，所述的连续油管的原材料为经过热轧和固溶处理后的酸洗状态的钢卷，所述的钢卷在热轧之前先通过EAF交流电弧炉冶炼，再经过AOD氩氧脱碳或VOD真空电弧炉精炼，有效控制P、S等杂质元素的含量。Further, the raw material of the coiled tubing is pickled steel coils after hot rolling and solution treatment, and the steel coils are first smelted through an EAF AC electric arc furnace before hot rolling, and then subjected to AOD argon oxygen. Decarburization or VOD vacuum arc furnace refining, effectively control the content of impurity elements such as P and S.
该高频感应焊高合金耐腐蚀连续油管的制备方法，包括以下步骤：The preparation method of the high-frequency induction welding high-alloy corrosion-resistant coiled tubing includes the following steps:
(1)选择热轧、固溶处理后的酸洗状态的钢卷，所述的钢卷先通过EAF交流电弧炉冶炼，再经过AOD氩氧脱碳或VOD真空电弧炉精炼，有效控制P、S等杂质元素的含量；然后纵剪、铣边，获得与连管外径相应的钢带宽度，并保证钢带边缘平整、光滑，钢带镰刀弯不得高于0.5mm/m；(1) Select the steel coils in the pickled state after hot rolling and solution treatment. The steel coils are first smelted by EAF AC electric arc furnace, and then refined by AOD argon-oxygen decarburization or VOD vacuum electric arc furnace. Content of impurity elements such as S; then slitting and milling to obtain the width of the steel strip corresponding to the outer diameter of the pipe, and ensure that the edge of the steel strip is flat and smooth, and the sickle bend of the steel strip must not be higher than 0.5mm / m;
(2)钢带对接：(2) Docking of steel strips:
根据连续油管长度要求(一般长达数千米)，通过钢带对焊的方式将钢带接长，钢带对焊需在惰性气体保护下，采用等离子焊或氩弧焊(TIG/MIG)进行焊接，焊接过程需填充Ni含量高于母材的焊丝，防止焊缝奥氏体含量减少或形成单一的铁素体组织而影响其抗腐蚀性能，所述的惰性气体为氩气或氮气；According to the coil tubing length requirements (usually up to several kilometers), the steel strips are extended by butt welding. The steel strips must be protected by inert gas, and plasma or argon arc welding (TIG / MIG) is used. For welding, the welding process needs to fill the welding wire with a higher Ni content than the base metal to prevent the austenite content of the weld from reducing or forming a single ferrite structure to affect its corrosion resistance. The inert gas is argon or nitrogen;
由于所述不锈钢材料合金元素含量较高，焊缝处容易产生氧化物夹杂，而影响焊缝的焊接质量。本方法对常规高频感应焊接工艺进行优化，采用惰性气体(氩气或氮气)对焊缝进行保护，惰性气体保护需要充分覆盖钢带边缘受热区(如图2中L所示)，配合焊接挤压辊的挤压，可完全避免焊缝夹杂物的产生。Due to the high alloy element content of the stainless steel material, oxide inclusions are easily generated at the weld, which affects the welding quality of the weld. This method optimizes the conventional high-frequency induction welding process. The inert gas (argon or nitrogen) is used to protect the weld. The inert gas protection needs to fully cover the heated area of the steel strip edge (shown as L in Figure 2). Squeeze by the squeeze roller can completely avoid the occurrence of weld inclusions.
(3)钢带卷曲成型(3) Steel strip curling
经过钢带对接，达到制管要求的总长度，然后将数千米的钢带转移到制管机组，钢带连续通过成型机组逐渐弯曲成型；考虑所述双相不锈钢材料成分及其性能，可选择工具钢轧辊、高速钢轧辊或铜辊等，以获得良好的连续油管表面 质量。After the steel belts are docked, the total length required for the pipe is reached, and then several kilometers of steel belts are transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit; considering the composition and performance of the duplex stainless steel material, Select tool steel rolls, high-speed steel rolls or copper rolls, etc. to obtain good coiled tubing surface quality.
(4)高频感应焊接(4) High frequency induction welding
根据连续油管材料的电磁感应特性，控制感应线圈与连管之间的间隙t≤9mm(如图2中所示)，焊接V型口角度α在5°-8°之间(如图2中所示)，并控制辊间隙，保证焊接过程中V型口的稳定，焊机功率100-360KW，焊接速度15-50m/min，连续完成高频感应焊高合金耐腐蚀连续油管的焊接；According to the electromagnetic induction characteristics of the coiled tubing material, control the gap between the induction coil and the connecting pipe t≤9mm (as shown in Figure 2), and the welding V-shaped port angle α is between 5 ° and 8 ° (as shown in Figure 2 (Shown), and control the roll gap to ensure the stability of the V-shaped mouth during the welding process, the welding machine power is 100-360KW, the welding speed is 15-50m / min, and the high-frequency induction welding of high-alloy corrosion-resistant coiled tubing is continuously completed;
(5)高频感应焊高合金耐腐蚀连续油管的焊缝固溶处理(5) Solution treatment of high-frequency induction welding of high-alloy corrosion-resistant coiled tubing
高频感应焊高合金耐腐蚀连续油管焊接成型后，通过感应加热设备将焊缝加热到1050-1150℃，保温1-10min后迅速入水进行快速冷却，以改善焊缝组织性能After high-frequency induction welding of high-alloy corrosion-resistant coiled tubing is welded and formed, the welding seam is heated to 1050-1150 ° C by induction heating equipment, and the water is rapidly cooled after holding for 1-10 minutes to improve the structure of the weld seam.
(6)高频感应焊高合金耐腐蚀连续油管的定径处理(6) Sizing of high-alloy corrosion-resistant coiled tubing for high-frequency induction welding
经过定径机组获得所需要的外径尺寸，定径完成后，高频感应焊高合金耐腐蚀连续油管经过热处理系统，整管加热到1080-1150℃，保温1-10min后迅速进入冷却水系统进行快速冷却后得到产品。After the sizing unit obtains the required outer diameter dimensions, after the sizing is completed, the high-frequency induction welding high alloy corrosion-resistant coiled tubing passes through a heat treatment system, the whole pipe is heated to 1080-1150 ° C, and it enters the cooling water system quickly after holding for 1-10 minutes. The product was obtained after rapid cooling.
进一步地说，钢带对焊完成后，将其加热到1020-1120℃，保温1-10min后，迅速喷水进行冷却。以进一步的优化焊缝组织，提升抗腐蚀性能。Further, after the butt welding of the steel strip is completed, it is heated to 1020-1120 ° C, and after being held for 1-10 minutes, it is quickly sprayed with water for cooling. To further optimize the weld structure and improve corrosion resistance.
本发明的有益效果是：The beneficial effects of the present invention are:
本发明制备了一种高频感应焊高合金耐腐蚀连续油管，可获得最小屈服强度552Mpa、最小抗拉强度758Mpa、最小塑性延伸率25％、最大硬度30HRC的高频感应焊高合金双相不锈钢连续油管。The invention prepares a high-frequency induction welding high-alloy corrosion-resistant coiled tubing, which can obtain a minimum yield strength of 552Mpa, a minimum tensile strength of 758Mpa, a minimum plastic elongation of 25%, and a maximum hardness of 30HRC. Coiled tubing.
该连续油管合金元素含量较高，可以满足高压、高CO 2、H 2S腐蚀环境的应用。采用高频感应焊接，焊接效率高，生产速度可达常规激光焊接的10倍以上。 本发明对高频焊接工艺进行创新和优化，首次实现了高合金双相不锈钢连续油管的焊接。通过两次固溶处理，可以保证整个管体获得优异的组织，焊缝、热影响区、母材的铁素体含量均控制在35％-55％之间，使连续油管具备良好的抗均匀腐蚀、缝隙腐蚀及氯化物应力腐蚀能力。本发明制备的产品强度高、疲劳寿命好，其弯曲疲劳寿命可达常规CT90连管的3-5倍。 The coiled tubing has a relatively high alloy element content, which can meet the application of high pressure, high CO 2 and H 2 S corrosion environments. High-frequency induction welding is adopted, with high welding efficiency, and the production speed can reach more than 10 times that of conventional laser welding. The invention innovates and optimizes the high-frequency welding process, and realizes the welding of high-alloy duplex stainless steel coiled tubing for the first time. Through two solution treatments, the entire pipe body can be guaranteed to have excellent structure, and the ferrite content in the weld, heat affected zone, and base metal is controlled between 35% and 55%, so that the coiled tubing has good resistance to uniformity. Corrosion, crevice corrosion and chloride stress corrosion capabilities. The product prepared by the invention has high strength and good fatigue life, and its bending fatigue life can reach 3-5 times that of the conventional CT90 coupling pipe.
附图说明BRIEF DESCRIPTION OF THE DRAWINGS
下面结合附图和具体实施方式对本发明作进一步详细的说明。The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
图1为高频感应焊高合金耐腐蚀连续油管的制备方法流程示意图；1 is a schematic flow chart of a method for preparing a high-alloy corrosion-resistant coiled tubing by high-frequency induction welding;
图2为本发明产品高频感应焊线圈及V型口控制示意图；2 is a schematic diagram of the control of the high-frequency induction welding coil and the V-shaped mouth of the product of the present invention;
具体实施方式detailed description
实施例1：Example 1:
一种高频感应焊高合金耐腐蚀连续油管，连续油管为双相不锈钢连续油管，双相不锈钢连续油管为铁素体和奥氏体双相不锈钢，双相不锈钢连续油管的合金元素，按照质量分数计，包括以下组成与组分：C 0.012％、Mn 1.1％、P 0.013％、S 0.002％、Si 0.55％、Cr 22.5％、Mo 3.2％、Ni 4.8％、N 0.17％、Fe余量。通过EAF交流电弧炉冶炼，再经过VOD真空电弧炉精炼。通过化学成分配比及热轧+固溶处理，获得铁素体+奥氏体两相组织，其中铁素体含量为35％。经过酸洗处理后获得0.175in壁厚的成品钢卷材料。钢卷按照2in连管外径要求进行纵剪，铣边后钢带边缘平整、光滑，钢带镰刀弯0.2mm/m。通过钢带对焊的方式将钢带接长。在氩气保护状态下，采用等离子焊进行焊接，焊接过程填充Ni含量高于母材的焊丝，防止焊缝奥氏体含量减少或形成单一的铁素体组织而影响其抗腐蚀性能。优选地，钢带对焊完成后进行焊后热处理，具体工艺为加热到1080℃保温1min后，迅速喷水进行冷却。A high-frequency induction welding high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel, and the duplex stainless steel coiled tubing, according to quality The score includes the following components and components: C 0.012%, Mn 1.1%, P 0.013%, S 0.002%, Si 0.55%, Cr 22.5%, Mo 3.2%, Ni 4.8%, N 0.17%, Fe balance. Smelting by EAF AC electric arc furnace, and then refining by VOD vacuum electric arc furnace. A two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 35%. After pickling, a finished steel coil material with a wall thickness of 0.175in was obtained. The steel coil is slit according to the outer diameter of the 2in continuous pipe. After milling, the edge of the steel strip is flat and smooth. The sickle of the steel strip is 0.2mm / m. The steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding. The welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance. Preferably, the steel strip is subjected to post-weld heat treatment after the butt-welding is completed. The specific process is that after heating to 1080 ° C. for 1 minute, the water is rapidly sprayed for cooling.
将钢带接长至3500m，然后将钢带转移到制管机组，钢带连续通过成型机组逐渐弯曲成型。考虑所述双相不锈钢材料成分及其性能，选择高碳、高合金工具钢轧辊。采用氮气对焊缝进行保护，气体保护充分覆盖钢带边缘受热区(如图2中L所示)，并配合焊接挤压辊的挤压，避免焊缝夹杂物的产生。根据所述连续油管材料的电磁感应特性，感应线圈与连管之间的间隙(如图2中t所示)为5mm，焊接V型口角度(如图2中α所示)为6°，并调整好辊子间隙保证焊接过程中V型口的稳定。调整焊机功率230KW，焊接速度30m/min连续完成不锈钢油管的焊接。连续油管焊接成型后需进行一次固溶处理，具体为，通过感应加热设备将焊缝加热到1100℃，保温2min后迅速入水进行快速冷却，以改善焊缝组织性能。一次固溶处理后，连续油管经过定径机组获得所需要的外径尺寸50.8±0.25mm。定径完成后，连续油管经过热处理系统，整管加热到1120℃，保温3min后迅速进入冷却水系统进行快速冷却。The steel belt is extended to 3500m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit. Considering the material composition and properties of the duplex stainless steel, high-carbon, high-alloy tool steel rolls are selected. Nitrogen is used to protect the weld seam. The gas shield fully covers the heated area of the edge of the steel strip (shown as L in Figure 2), and cooperates with the extrusion of the welding squeeze roller to avoid the occurrence of weld inclusions. According to the electromagnetic induction characteristics of the coiled tubing material, the gap between the induction coil and the connecting pipe (shown as t in FIG. 2) is 5mm, and the welding V-shaped port angle (shown as α in FIG. 2) is 6 °. And adjust the roll gap to ensure the stability of the V-shaped mouth during the welding process. Adjust the welding machine power to 230KW and the welding speed of 30m / min to complete the welding of stainless steel tubing continuously. After the coiled tubing is welded and formed, a solution treatment is required. Specifically, the welding seam is heated to 1100 ° C by an induction heating device, and the water is rapidly cooled after being held for 2 minutes to improve the structure of the weld seam. After a solid solution treatment, the coiled tubing is passed through a sizing unit to obtain the required outer diameter of 50.8 ± 0.25mm. After the sizing is completed, the coiled tubing passes through a heat treatment system, and the entire tube is heated to 1120 ° C. After 3 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.
最终，获得屈服强度658Mpa、抗拉强度773Mpa、塑性延伸率35％、硬度23HRC的高频感应焊2.000in*0.175in高合金双相不锈钢连续油管。Finally, a high-frequency induction welding 2.000in * 0.175in high-duplex stainless steel coiled tubing with a yield strength of 658Mpa, a tensile strength of 773Mpa, a plastic elongation of 35%, and a hardness of 23HRC was obtained.
实施例2：Example 2:
一种高频感应焊高合金耐腐蚀连续油管，连续油管为双相不锈钢连续油管，双相不锈钢连续油管为铁素体和奥氏体双相不锈钢，双相不锈钢连续油管的合金元素，按照质量分数计，包括以下组成与组分：C 0.01％、Mn 1.25％、P 0.017％、S 0.002％、Si 0.36％、Cr 25％、Mo 4.5％、Ni 8.0％、N 0.26％、Fe余量。通过EAF交流电弧炉冶炼，再经过AOD氩氧脱碳精炼。通过化学成分配比及热轧+固溶处理，获得铁素体+奥氏体两相组织，其中铁素体含量为55％。经过酸洗处理后获得0.156in壁厚的成品钢卷材料。钢卷按照1.75in连管外径要求进行纵剪， 铣边后钢带边缘平整、光滑，钢带镰刀弯0.2mm/m。通过钢带对焊的方式将钢带接长。在氩气保护状态下，采用等离子焊进行焊接，焊接过程填充Ni含量高于母材的焊丝，防止焊缝奥氏体含量减少或形成单一的铁素体组织而影响其抗腐蚀性能。优选地，钢带对焊完成后进行焊后热处理，具体工艺为加热到1100℃保温5min后，迅速喷水进行冷却。A high-frequency induction welding high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel, and the duplex stainless steel coiled tubing, according to quality In terms of scores, the following components and components are included: C 0.01%, Mn 1.25%, P 0.017%, 0.002%, Si 0.36%, Cr 25%, Mo 4.5%, Ni 8.0%, N 0.26%, and Fe balance. It is smelted by EAF AC electric arc furnace, and then refined by AOD argon-oxygen decarburization. A two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 55%. After pickling, a finished steel coil material with a wall thickness of 0.156 inches was obtained. The steel coil is slitted according to the outer diameter of the 1.75-in. Pipe. After milling, the edge of the steel strip is flat and smooth, and the steel strip has a sickle bend of 0.2mm / m. The steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding. The welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance. Preferably, after the butt welding of the steel strip is completed, a post-weld heat treatment is performed. The specific process is that the steel strip is heated to 1100 ° C for 5 minutes, and then sprayed with water for cooling.
将钢带接长至3000m，然后将钢带转移到制管机组，钢带连续通过成型机组逐渐弯曲成型。考虑所述双相不锈钢材料成分及其性能，选择高速钢轧辊。采用氮气对焊缝进行保护，气体保护充分覆盖钢带边缘受热区(如图2中L所示)，并配合焊接挤压辊的挤压，避免焊缝夹杂物的产生。根据所述连续油管材料的电磁感应特性，感应线圈与连管之间的间隙(如图2中t所示)为5mm，焊接V型口角度(如图2中α所示)为7°，并调整好辊子间隙保证焊接过程中V型口的稳定。调整焊机功率255KW，焊接速度36m/min连续完成不锈钢油管的焊接。连续油管焊接成型后需进行一次固溶处理，具体为，通过感应加热设备将焊缝加热到1100℃，保温6min后迅速入水进行快速冷却，以改善焊缝组织性能。一次固溶处理后，连续油管经过定径机组获得所需要的外径尺寸44.5±0.25mm。定径完成后，连续油管经过热处理系统，整管加热到1150℃，保温8min后迅速进入冷却水系统进行快速冷却。The steel belt is extended to 3000m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit. Considering the material composition and properties of the duplex stainless steel, a high-speed steel roll is selected. Nitrogen is used to protect the weld seam. The gas shield fully covers the heated area of the edge of the steel strip (shown as L in Figure 2), and cooperates with the extrusion of the welding squeeze roller to avoid the occurrence of weld inclusions. According to the electromagnetic induction characteristics of the coiled tubing material, the gap between the induction coil and the connecting pipe (shown as t in FIG. 2) is 5 mm, and the welding V-shaped port angle (shown as α in FIG. 2) is 7 °. And adjust the roll gap to ensure the stability of the V-shaped mouth during the welding process. Adjust the welding machine power of 255KW and welding speed of 36m / min to complete the welding of stainless steel tubing continuously. After the coiled tubing is welded and formed, a solution treatment is required. Specifically, the welding seam is heated to 1100 ° C by an induction heating device, and the water is rapidly cooled after being held for 6 minutes to improve the structure of the weld seam. After a solid solution treatment, the coiled tubing passes the sizing unit to obtain the required outer diameter of 44.5 ± 0.25mm. After the sizing is completed, the coiled tubing passes through a heat treatment system, and the entire tube is heated to 1150 ° C. After 8 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.
最终，获得屈服强度705Mpa、抗拉强度842Mpa、塑性延伸率30％、硬度25HRC的高频感应焊1.750in*0.156in高合金双相不锈钢连续油管。Finally, a high-frequency induction welding 1.750in * 0.156in high-alloy duplex stainless steel coiled tubing with a yield strength of 705Mpa, a tensile strength of 842Mpa, a plastic elongation of 30%, and a hardness of 25HRC was obtained.
实施例3：Example 3:
一种高频感应焊高合金耐腐蚀连续油管，连续油管为双相不锈钢连续油管，双相不锈钢连续油管为铁素体和奥氏体双相不锈钢，双相不锈钢连续油管的合 金元素，按照质量分数计，包括以下组成与组分：C 0.018％、Mn 0.96％、P 0.01％、S 0.002％、Si 0.45％、Cr 30.0％、Mo 1.5％、Ni 4.5％％、N 0.4％、Fe余量。通过EAF交流电弧炉冶炼，再经过VOD真空电弧炉精炼。通过化学成分配比及热轧+固溶处理，获得铁素体+奥氏体两相组织，其中铁素体含量为45％。经过酸洗处理后获得0.156in壁厚的成品钢卷材料。钢卷按照2in连管外径要求进行纵剪，铣边后钢带边缘平整、光滑，钢带镰刀弯0.2mm/m。通过钢带对焊的方式将钢带接长。在氩气保护状态下，采用等离子焊进行焊接，焊接过程填充Ni含量高于母材的焊丝，防止焊缝奥氏体含量减少或形成单一的铁素体组织而影响其抗腐蚀性能。优选地，钢带对焊完成后进行焊后热处理，具体工艺为加热到1070℃保温3min后，迅速喷水进行冷却。A high-frequency induction welding high-alloy corrosion-resistant coiled tubing, the coiled tubing is a duplex stainless steel coiled tubing, the duplex stainless steel coiled tubing is an alloy element of ferritic and austenitic duplex stainless steel, and the duplex stainless steel coiled tubing, according to quality The score includes the following composition and components: C 0.018%, Mn 0.96%, P 0.01%, S 0.002%, Si 0.45%, Cr 30.0%, Mo 1.5%, Ni 4.5 %%, N 0.4%, Fe balance . Smelting by EAF AC electric arc furnace, and then refining by VOD vacuum electric arc furnace. A two-phase structure of ferrite + austenite was obtained through chemical composition distribution ratio and hot rolling + solid solution treatment, in which the ferrite content was 45%. After pickling, a finished steel coil material with a wall thickness of 0.156 inches was obtained. The steel coil is slit according to the outer diameter of the 2in continuous pipe. After milling, the edge of the steel strip is flat and smooth. The sickle of the steel strip is 0.2mm / m. The steel strip is extended by butt welding. Under the protection of argon, plasma welding is used for welding. The welding process is filled with a wire with a higher Ni content than the base metal, which prevents the austenite content of the weld from reducing or forming a single ferrite structure, which affects its corrosion resistance. Preferably, the post-weld heat treatment is performed after the completion of the butt welding of the steel strip. The specific process is that the steel strip is heated to 1070 ° C for 3 minutes, and then sprayed with water for cooling.
将钢带接长至2700m，然后将钢带转移到制管机组，钢带连续通过成型机组逐渐弯曲成型。考虑所述双相不锈钢材料成分及其性能，选择高碳、高合金工具钢轧辊。采用氮气对焊缝进行保护，气体保护充分覆盖钢带边缘受热区(如图2中L所示)，并配合焊接挤压辊的挤压。根据所述连续油管材料的电磁感应特性，感应线圈与连管之间的间隙(如图2中t所示)为5mm，焊接V型口角度(如图2中α所示)为6°，并调整好辊子间隙保证焊接过程中V型口的稳定。调整焊机功率180KW，焊接速度32m/min连续完成不锈钢油管的焊接。连续油管焊接成型后需进行一次固溶处理，具体为，通过感应加热设备将焊缝加热到1080℃，保温10min后迅速入水进行快速冷却，以改善焊缝组织性能。一次固溶处理后，连续油管经过定径机组获得所需要的外径尺寸50.8±0.25mm。定径完成后，连续油管经过热处理系统，整管加热到1100℃，保温5min后迅速进入冷却水系统进行快速冷却。The steel belt is extended to 2700m, and then the steel belt is transferred to the pipe making unit, and the steel belt is continuously bent and formed by the forming unit. Considering the material composition and properties of the duplex stainless steel, high-carbon, high-alloy tool steel rolls are selected. Nitrogen is used to protect the weld seam, and the gas shield fully covers the heated area of the edge of the steel strip (as shown by L in Figure 2), and cooperates with the extrusion of the welding squeeze roller. According to the electromagnetic induction characteristics of the coiled tubing material, the gap between the induction coil and the connecting pipe (shown as t in FIG. 2) is 5mm, and the welding V-shaped port angle (shown as α in FIG. 2) is 6 °. And adjust the roll gap to ensure the stability of the V-shaped mouth during the welding process. Adjust the welding machine power to 180KW and the welding speed to 32m / min to complete the welding of stainless steel tubing continuously. After the coiled tubing is welded and formed, a solution treatment is required. Specifically, the welding seam is heated to 1080 ° C by an induction heating device, and the water is rapidly cooled after 10 minutes of heat preservation to improve the structure of the weld seam. After a solid solution treatment, the coiled tubing is passed through a sizing unit to obtain the required outer diameter of 50.8 ± 0.25mm. After the sizing is completed, the coiled tubing passes through the heat treatment system, and the entire pipe is heated to 1100 ° C. After 5 minutes of heat preservation, it quickly enters the cooling water system for rapid cooling.
最终，获得屈服强度689Mpa、抗拉强度793Mpa、塑性延伸率34％、硬度24HRC的高频感应焊2.000in*0.156in高合金双相不锈钢连续油管。Finally, a high-frequency induction welding 2.000in * 0.156in high-duplex stainless steel coiled tubing with a yield strength of 689Mpa, a tensile strength of 793Mpa, a plastic elongation of 34%, and a hardness of 24HRC was obtained.
以上所述，仅是本发明的较佳实施例，并非对本发明做任何形式上的限制，凡是依据本发明的技术实质上对以上实施例所作的任何简单修改、等同变化，均落入本发明的保护范围之内。The above are only the preferred embodiments of the present invention, and do not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiments according to the technology of the present invention falls into the present invention. Within the scope of protection.

Claims (4)

  1. 一种高频感应焊高合金耐腐蚀连续油管，其特征在于，所述的连续油管为双相不锈钢连续油管，所述的双相不锈钢连续油管为铁素体和奥氏体双相不锈钢，其金相组织中铁素体含量为35％-55％，所述的双相不锈钢连续油管的合金元素，按照质量分数计，包括以下组成与组分：C≤0.03％、Mn≤2.5％、P≤0.03％、S≤0.005％、Si≤1.0％、Cr 22.0％-30.0％、Mo 1.5％-5.0％、Ni 4.5％-8.0％、N0.14％-0.40％、Fe余量。A high-frequency induction welding high alloy corrosion-resistant coiled tubing is characterized in that the coiled tubing is a duplex stainless steel coiled tubing, and the duplex stainless steel coiled tubing is a ferritic and austenitic duplex stainless steel. The ferrite content in the metallographic structure is 35% -55%, and the alloying elements of the duplex stainless steel coiled tubing include the following compositions and components in terms of mass fraction: C≤0.03%, Mn≤2.5%, P≤ 0.03%, S≤0.005%, Si≤1.0%, Cr 22.0% -30.0%, Mo 1.5% -5.0%, Ni 4.5% -8.0%, N0.14% -0.40%, Fe balance.
  2. 根据权利要求1所述的高频感应焊高合金耐腐蚀连续油管，其特征在于，所述的连续油管的原材料为经过热轧和固溶处理后的酸洗状态的钢卷，所述的钢卷在热轧之前先通过EAF交流电弧炉冶炼，再经过AOD氩氧脱碳或VOD真空电弧炉精炼，有效控制P、S等杂质元素的含量。The high-frequency induction-welded high-alloy corrosion-resistant coiled tubing according to claim 1, wherein a raw material of the coiled tubing is a steel coil in a pickled state after hot rolling and solution treatment, and the steel Before hot rolling, the coil is smelted by EAF AC electric arc furnace, and then refined by AOD argon-oxygen decarburization or VOD vacuum electric arc furnace, effectively controlling the content of impurity elements such as P and S.
  3. 根据权利要求1或2所述的高频感应焊高合金耐腐蚀连续油管的制备方法，其特征在于，包括以下步骤：The method for preparing a high-frequency induction-welded high-alloy corrosion-resistant coiled tubing according to claim 1 or 2, comprising the following steps:
    (1)选择热轧、固溶处理后的酸洗状态的钢卷，所述的钢卷先通过EAF交流电弧炉冶炼，再经过AOD氩氧脱碳或VOD真空电弧炉精炼，有效控制P、S等杂质元素的含量；然后纵剪、铣边，获得与连管外径相应的钢带宽度，并保证钢带边缘平整、光滑，钢带镰刀弯不得高于0.5mm/m；(1) Select the steel coils in the pickled state after hot rolling and solution treatment. The steel coils are first smelted by EAF AC electric arc furnace, and then refined by AOD argon-oxygen decarburization or VOD vacuum electric arc furnace. Content of impurity elements such as S; then slitting and milling to obtain the width of the steel strip corresponding to the outer diameter of the pipe, and ensure that the edge of the steel strip is flat and smooth, and the sickle bend of the steel strip must not be higher than 0.5mm / m;
    (2)钢带对接：(2) Docking of steel strips:
    根据连续油管长度要求，通过钢带对焊的方式将钢带接长，钢带对焊需在惰性气体保护下，采用等离子焊或氩弧焊(TIG/MIG)进行焊接，焊接过程需填充Ni含量高于母材的焊丝，防止焊缝奥氏体含量减少或形成单一的铁素体组织而影响其抗腐蚀性能，所述的惰性气体为氩气或氮气；According to the requirements of the length of the coiled tubing, the steel strips are extended by butt welding. The steel strips must be welded under inert gas, using plasma welding or argon arc welding (TIG / MIG). The welding process needs to be filled with Ni. Welding wires with a content higher than that of the base material prevent the austenite content in the weld from decreasing or forming a single ferrite structure to affect its corrosion resistance. The inert gas is argon or nitrogen;
    (3)钢带卷曲成型(3) Steel strip curling
    经过钢带对接，达到制管要求的总长度，然后将数千米的钢带转移到制管机组，钢带连续通过成型机组逐渐弯曲成型；所述的成型机组包括工具钢轧辊、高速钢轧辊或铜辊中任意一种；After the steel belts are docked, the total length required for the tube is reached, and then several kilometers of steel belts are transferred to the tube making unit, and the steel belt is continuously bent and formed by the forming unit; the forming unit includes tool steel rolls, high-speed steel rolls Or any one of the copper rollers;
    (4)高频感应焊接(4) High frequency induction welding
    根据连续油管材料的电磁感应特性，控制感应线圈与连管之间的间隙t≤9mm，焊接V型口角度α在5°-8°之间，并控制辊间隙，保证焊接过程中V型口的稳定，焊机功率100-360KW，焊接速度15-50m/min，连续完成高频感应焊高合金耐腐蚀连续油管的焊接；According to the electromagnetic induction characteristics of the coiled tubing material, control the gap between the induction coil and the connecting pipe t≤9mm, the welding V-port angle α is between 5 ° -8 °, and control the roll gap to ensure the V-port during the welding process Stability, welding power of 100-360KW, welding speed of 15-50m / min, continuous completion of high-frequency induction welding of high-alloy corrosion-resistant coiled tubing;
    (5)高频感应焊高合金耐腐蚀连续油管的焊缝固溶处理(5) Solution treatment of high-frequency induction welding of high-alloy corrosion-resistant coiled tubing
    高频感应焊高合金耐腐蚀连续油管焊接成型后，通过感应加热设备将焊缝加热到1050-1150℃，保温1-10min后迅速入水进行快速冷却，以改善焊缝组织性能After high-frequency induction welding of high-alloy corrosion-resistant coiled tubing is welded and formed, the welding seam is heated to 1050-1150 ° C by induction heating equipment, and the water is rapidly cooled after holding for 1-10 minutes to improve the structure of the weld seam.
    (6)高频感应焊高合金耐腐蚀连续油管的定径处理(6) Sizing of high-alloy corrosion-resistant coiled tubing for high-frequency induction welding
    经过定径机组获得所需要的外径尺寸，定径完成后，高频感应焊高合金耐腐蚀连续油管经过热处理系统，整管加热到1080-1150℃，保温1-10min后迅速进入冷却水系统进行快速冷却后得到产品。After the sizing unit obtains the required outer diameter dimensions, after the sizing is completed, the high-frequency induction welding high alloy corrosion-resistant coiled tubing passes through a heat treatment system, the whole pipe is heated to 1080-1150 ° C, and it enters the cooling water system quickly after holding for 1-10 minutes The product was obtained after rapid cooling.
  4. 根据权利要求3所述的高频感应焊高合金耐腐蚀连续油管的制备方法，其特征在于，钢带对焊完成后，将其加热到1020-1120℃，保温1-10min后，迅速喷水进行冷却。The method for preparing a high-alloy corrosion-resistant coiled tubing for high-frequency induction welding according to claim 3, characterized in that, after the butt welding of the steel strip is completed, it is heated to 1020-1120 ° C, and after being held for 1-10 minutes, water is sprayed quickly. Allow to cool.
PCT/CN2018/095771 2018-08-14 2018-08-14 High-frequency induction welded high alloy anti-corrosion coiled tubing and preparation method therefor WO2020034050A1 (en)

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