WO2012019422A1 - Method for manufacturing continuous expansion pipe with high strength and ductility - Google Patents

Method for manufacturing continuous expansion pipe with high strength and ductility Download PDF

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Publication number
WO2012019422A1
WO2012019422A1 PCT/CN2011/000942 CN2011000942W WO2012019422A1 WO 2012019422 A1 WO2012019422 A1 WO 2012019422A1 CN 2011000942 W CN2011000942 W CN 2011000942W WO 2012019422 A1 WO2012019422 A1 WO 2012019422A1
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Prior art keywords
welding
pipe
continuous expansion
steel
thickness
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PCT/CN2011/000942
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French (fr)
Chinese (zh)
Inventor
冯耀荣
杨龙
宋生印
上官丰收
刘永刚
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中国石油天然气集团公司
中国石油天然气集团公司管材研究所
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Publication of WO2012019422A1 publication Critical patent/WO2012019422A1/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • 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
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • 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
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • 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
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • 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
    • C22C38/16—Ferrous alloys, e.g. steel alloys containing 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
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Definitions

  • the invention relates to a method for preparing a high-strength (yield strength of 485 ⁇ 760Mpa) high plastic toughness (plastic deformation of tube diameter 10-30%, impact toughness ⁇ 40) continuous expansion tube.
  • Expansion tube technology is an emerging technology in oil completion and workover projects. The method is that the casing is driven into a predetermined position in the well, the mud liquid is conveyed through the intermediate pipe, and the gap space outside the casing is filled, and then the lower expansion cone is pushed by the liquid pressure to expand the expansion casing from the bottom to the top; The casing diameter is 10-30% plastically deformed. Expansion tube technology can also be applied to repair oil well casings.
  • the object of the present invention is to provide a high strength and high plastic toughness (yield strength of 485 to 760 MPa, 10-30% of tube diameter plastic deformation, impact toughness 40)) chemical composition and manufacturing process of continuous expansion tube, overcome Ordinary expansion pipe construction requires insufficient welding or threaded connection, as well as low strength and leakage technical problems of the joints existing after construction, ensuring high strength and good plastic toughness after expansion, easy to use, safe and reliable.
  • the invention discloses a high-strength, high-plastic and toughness continuous expansion pipe, which is an expandable continuous pipe manufactured by a straight seam resistance enthalpy (ERW) pipe-making technology, since the pipe body itself is a continuous pipe, and the continuous expansion pipe is not in the middle. Threaded fasteners, without splicing welds, overcome the technical problems of low strength and loss of joints common in common expandable tubes. Since the length of the continuous expansion pipe is long, in order to adapt to the processing and manufacturing of the continuous expansion pipe, and the strength plasticity and toughness requirements after the expansion of the expansion pipe, the present invention changes the continuous expansion pipe alloy material under the concept of the continuous expansion pipe. The composition and corresponding manufacturing process ensure the realization of continuous expansion tube technology.
  • ERP straight seam resistance enthalpy
  • step 1) The components of step 1) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200 V. Constant temperature, rough rolling at 1000 ⁇ 1100 °C, finish rolling at 700 ⁇ 950 °C, rolling a post-cooling speed of 15 to 30 ° C / s, a coiling temperature of 500 to 600 ° C, to a thickness of 6 ⁇ : 15 legs of hot-rolled coil;
  • the weld is normalized at 930 ⁇ 960 °C, and the starting temperature of water cooling after normalizing is controlled at 350 ⁇ 400 °C to obtain ideal dual phase structure with fine ferrite and a small amount of pearlite; Or perform an overall normalizing at 900 ⁇ 950 °C.
  • preparing a hot rolled coil the above materials (components) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200 ° C. Rough rolling at 1000 ⁇ 1100 °C, finish rolling at 750 ⁇ 950 °C, cooling after rolling
  • the hot rolled coil having a thickness of 6.35 mm is obtained by a coiling temperature of 15 to 20 ° C / s, and a coiling temperature of 550 to 600 ° C.
  • Roll slitting and butt welding The prepared hot rolled coil is cut into 380mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe welding, it should avoid slitting from the width of the coil. . In order to meet the steel strip and continuous expansion tube length requirements, the steel strip must be butt welded, and the head and tail are processed into 45°. The submerged arc automatic welding or C0 2 gas protection ⁇ welding method is used to make the steel through 45° oblique welding. The belts are connected.
  • the edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roll forming method; the welding current and voltage parameters are adjusted; 5 ⁇ The thickness is 1. 6 ⁇ 2. 2mm, the opening angle is made at 6 °, the welding is carried out, the splicing speed V is 19 ⁇ 21m / min; the splicing into a thickness of 6. 35 awake, the outer diameter of 114. 3ram straight Sewage resistance ⁇ steel pipe.
  • the quilting is normalized at 930 ⁇ 960 °C, and the starting temperature of the water cooling after normalizing is controlled at 350 ⁇ 400 °C to obtain the ideal duplex structure with fine ferrite and a small amount of pearlite.
  • the main technical indexes of continuous expansion pipe are: minimum yield strength reaches 485MPa, minimum tensile strength reaches 555MPa, minimum elongation is 35%, minimum Charpy impact energy 40J, highest hardness.
  • Example 2 The main technical indexes of continuous expansion pipe are: minimum yield strength reaches 485MPa, minimum tensile strength reaches 555MPa, minimum elongation is 35%, minimum Charpy impact energy 40J, highest hardness.
  • preparing a hot rolled coil the above materials (components) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200. . C, rough rolling at 1000 ⁇ 1100 °C, finish rolling at 730 ⁇ 950 °C, cooling rate after rolling is 20 ⁇ 30 °C / s, coiling temperature 550 ⁇ 600 °C, excellent overall performance
  • the thickness of the hot rolled coil of 7. 52 ram.
  • Plate slitting and butt welding The prepared hot rolled coil is cut into 420mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent tube welding, it should avoid slitting from the width of sheet coil 1/2. . In order to meet the requirements of the length of the steel strip and the continuous expansion tube, the steel strip needs to be butt welded, and the head and the tail are processed into 45°, and the steel is passed through the 45° oblique boring method by submerged arc automatic boring or C0 2 gas protection ⁇ welding. The belts are connected.
  • the edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roll forming method; the welding current and voltage parameters are adjusted; The pressure is in the range of L 7 ⁇ 2. 3ram, the opening angle is made at 6°, the welding is performed, the welding speed V is 19 ⁇ 21 m/min , and the straight seam electric resistance welded steel pipe having a thickness of 7.52 mm and an outer diameter of 127 mm is welded.
  • the weld is normalized at 930 ⁇ 960 °C, and the initial temperature of water cooling after normalizing is controlled at 350 ⁇ 400 °C to obtain the ideal duplex structure with fine ferrite and a small amount of pearlite.
  • the main technical indexes of continuous expansion pipe are: minimum yield strength reaches 555MPa, minimum tensile strength reaches 620MPa, minimum elongation is 30%, minimum Charpy impact energy 40J, highest hardness.
  • Example 3 The main technical indexes of continuous expansion pipe are: minimum yield strength reaches 555MPa, minimum tensile strength reaches 620MPa, minimum elongation is 30%, minimum Charpy impact energy 40J, highest hardness.
  • preparing a hot rolled coil the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into thick slabs with a thickness of about 250mm, then heating to about 1200 °C, rough rolling at 1000 ⁇ 1100 °C, finishing rolling at 700 ⁇ 950 °C, rolling
  • the post-cooling speed is 20 to 30 ° C / s, and the coiling temperature is 500 to 550 ° C, and a hot rolled coil having a thickness of 7.72 mm is obtained.
  • the prepared hot rolled coil is cut into 460mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe splicing, it should be avoided from 1/2 of the width of the coil. Cut. In order to meet the length requirements of the steel strip and the continuous expansion tube, the steel strip needs to be twisted together, and the head and the tail are processed into 45°, and the submerged arc automatic crucible or C0 2 gas shielded welding is used to make the 45° oblique welding method. The steel strips are connected.
  • Steel pipe is used to produce straight seam resistance splicing steel pipe: the edge of the plate is milled, the width of the strip and the verticality of the edge of the slab are precisely controlled.
  • the edge of the slab is controlled by the roll forming method; the splicing current and voltage parameters are adjusted; The squeezing amount is 7. 8 ⁇ 2. 5 ram, the opening angle is made at 7°, the splicing is performed, the welding speed V is 18 ⁇ 20 m/min; the splicing is 7.72 ⁇ , and the outer diameter is 139. 7mm straight seam electric resistance welded steel pipe.
  • Minimum yield strength reaches 620MPa
  • minimum tensile strength reaches 670MPa
  • minimum elongation is 30%
  • minimum Charpy impact energy 40J highest hardness HRC23 o
  • preparing a hot rolled coil the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into thick slabs with a thickness of about 250mm, then heating to about 1200 °C, rough rolling at 1000 ⁇ 1100 °C, finishing rolling at 700 ⁇ 950 °C, rolling
  • the hot-rolled coil having a thickness of 10.36 mm, which has a good overall performance, is obtained by a post-cooling speed of 20 to 30 ° C / s, and a coiling temperature of 500 to 550 ° C.
  • the prepared hot-rolled coil is cut into 580mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe splicing, it should be avoided from 1/2 of the width of the coil. Cut. In order to meet the requirements of steel strip and continuous expansion tube length, it is necessary to butt the steel strip, and machine the head and the tail to 45°.
  • the steel is brazed by 45° oblique welding by submerged arc automatic or C0 2 gas shielded welding. The belts are connected.
  • the edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roller forming method; the welding current and voltage parameters are adjusted; 5 ⁇
  • the thickness is in the range of 1. 8 ⁇ 2. 5mm, the opening angle is made at 8 °, the splicing speed V is 18 ⁇ 20m / min; ⁇ connected to a thickness of 10. 36mm, the outer diameter of 177. 8mm straight Sewage resistance ⁇ steel pipe.
  • preparing a hot rolled coil the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into a thick slab with a thickness of about 250mm, then heating to about 1200 V, rough rolling at 1000 ⁇ 1100 °C, finishing rolling at 700 ⁇ 950 °C, after rolling
  • the hot-rolled coil having a thickness of 14.15 mm is obtained by a coiling temperature of 20 to 30 ° C / s, and a coiling temperature of 500 to 550 ° C.
  • Plate slitting and facing The prepared hot rolled coil is cut into 710mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent tube welding, it should avoid slitting from the width of sheet coil 1/2. . In order to meet the requirements of steel strip and continuous expansion tube length, it is necessary to butt the steel strip, and machine the head and tail to 45°. Use submerged arc automatic welding or C0 2 gas shielded welding to make the steel through 45° oblique welding. The belts are connected.
  • the edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roller forming method; the welding current and voltage parameters are adjusted; 0 ⁇ , the opening is 0. 0mm, the opening angle 0 is controlled at 8°, the welding is performed, the welding speed V is 18 ⁇ 20m/min, and the welding is formed into a straight seam with a thickness of 14.15 awake and an outer diameter of 219. Electric resistance welded steel pipe.
  • the main technical indicators of continuous expansion tube the minimum yield strength reaches 485 ⁇ 760MPa, the minimum tensile strength reaches 555 ⁇ 800MPa, the lowest elongation is 25 ⁇ 35%, the lowest Charpy impact work 40J, the highest hardness HRC22 ⁇ HRC30.
  • the outer diameter of the continuous expansion tube ranges from 114. 3-219. lmm, and the wall thickness ranges from 6 to 15 awake.
  • the length of the continuous expansion tube ranges from 100m to 1000m. It can be wound onto a suitable mandrel for transport and use. According to the thickness of the underground working layer and the construction needs, the appropriate length can be intercepted.
  • the chemical composition and manufacturing process of a high-strength, high-plasticity and toughness continuous expansion pipe according to the present invention, the pipe body of the continuous expansion pipe itself is continuous, overcoming the shortage of welding or screwing required for the construction of the ordinary expansion pipe, and construction
  • the post-existing joints have low strength and leakage technical problems, ensuring high strength and good plastic toughness after expansion; and the length can be intercepted according to the needs of the site, which is convenient and reliable.
  • the continuous expansion tube of the invention can be applied to drilling, finishing, oil recovery, workover, etc., which can solve the problem of the well diameter reduction and save a lot of operation cost.

Abstract

Disclosed is a method for manufacturing a continuous expansion pipe with high strength. The material of the pipe comprises the following chemical components in percentage by mass: 0.03-0.12% of C, 0.17-0.40% of Si, 0.80-1.90% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0-1.0% of Cr, 0.10-0.50% of Mo, 0-0.30% of Ni, 0-0.05% of V, 0-0.03% of Ti, 0-0.30% of Cu, 0.01-0.06% of Nb, and the balance of Fe. The components are manufactured into a hot-rolled coil after being melted via an oxygen-blown converter, refined outside the converter, degassed in vacuum, cast continuously, rolled roughly, and rolled precisely. The hot-rolled coil is sheared into steel strips and the steel strips are connected with each other by butt-welding. A longitudinal electric resistance welding steel pipe is produced by the steel strips. The minimum yield strength of the steel pipe is 485-760MPa, the minimum elongation is 25-35%, and the impact power is greater than or equal to 40J.

Description

一种高强度高塑韧件连续膨胀管的制备方法  Method for preparing high strength and high plastic toughness continuous expansion tube
技术领域 Technical field
本发明涉及一种高强度 （屈服强度达到 485〜760Mpa) 高塑韧性 （管 直径发生 10-30%的塑性形变、 冲击韧性^40 ）连续膨胀管的制备方法。 背景技术 随着石油勘探开发的深度和广度不断提高， 勘探开发的难度日益增 大， 井况复杂程度越来越大。 当钻井作业需要通过更深的过压地层， 通 过枯竭地层或易坍塌易漏失地层时， 现有的技术采用不同直径的钻头钻 进， 并以不同直径的套管层层封固完成。 井越深， 套管层次越多， 要求 最初的一开井眼直径越大； 反之， 如果一开直径一定， 则最终的井眼直 径将会更小， 有可能钻不到目的层或者即便钻至目的层， 完井眼小， 满 足不了开采及后续修井、 增产等作业的要求。 于是， 出现了膨胀管技术。 膨胀管技术是石油完井和修井工程中一项新兴技术。 其方法是将套管下 入井内预定位置， 通过中间管输送泥浆液， 注满套管外侧的间隙空间， 然后下部扩充锥受液体压力的推动， 自下而上地扩径膨胀套管； 使套管 直径发生 10-30%的塑性形变。 膨胀管技术还可以应用于修复油井套管。 以往对于长距离存在孔洞、 裂紋、 错断缺陷的套管无法修复， 而采用膨 胀管解决大段套管腐蚀问题十分有效。 利用膨胀管悬挂和封隔， 密封效 果好、 作业简单、 成本低廉、 使用寿命长。 膨胀管技术是很有发展前景 的重大技术变革。  The invention relates to a method for preparing a high-strength (yield strength of 485~760Mpa) high plastic toughness (plastic deformation of tube diameter 10-30%, impact toughness ^40) continuous expansion tube. BACKGROUND OF THE INVENTION With the increasing depth and breadth of petroleum exploration and development, the difficulty of exploration and development is increasing, and the complexity of well conditions is increasing. When drilling operations require deeper overpressure formations, through depleted formations or easily collapsed, the existing technology is drilled with drill bits of different diameters and sealed with layers of casing of different diameters. The deeper the well, the more the casing level, the larger the diameter of the first opening hole is required. Conversely, if the opening diameter is constant, the final hole diameter will be smaller, and it is possible to drill the target layer or even drill. To the target level, the completion of the well is small, can not meet the requirements of mining and subsequent workovers, increase production and other operations. As a result, expansion tube technology has emerged. Expansion tube technology is an emerging technology in oil completion and workover projects. The method is that the casing is driven into a predetermined position in the well, the mud liquid is conveyed through the intermediate pipe, and the gap space outside the casing is filled, and then the lower expansion cone is pushed by the liquid pressure to expand the expansion casing from the bottom to the top; The casing diameter is 10-30% plastically deformed. Expansion tube technology can also be applied to repair oil well casings. In the past, the casings with holes, cracks and faults in the long distance could not be repaired, and it was very effective to use the expansion pipe to solve the problem of large casing corrosion. Suspension and isolation by expansion tube, good sealing effect, simple operation, low cost and long service life. Expansion tube technology is a major technological change with great development prospects.
当前膨胀管技术存在的一个重要技术问题是： 下井套管之间采用特 殊螺纹连接， 特殊螺纹加工困难， 施工装配较为繁琐。 一般来说单根膨 胀管的长度仅有 10米左右， 满足不了现场技术要求。 因此， 需要将多个 单根膨胀管用悍接方式或用螺紋方式连接在一起下井， 又带来了新的技 术难题： 连接部位的强度偏低， 且更为重要的是连接部位的漏失问题解 决起来非常困难。 因此， 亟需提出一种新的综合性解决方案。 发明内容 本发明目的是提供的一种高强度高塑韧性 （屈服强度达到 485〜 760Mpa,管直径发生 10-30%的塑性形变、 冲击韧性 40】）连续膨胀管的 化学成分及制造工艺， 克服普通膨胀管施工时需要焊接或螺紋连接的不 足， 以及施工后存在的连接部位强度低和漏失技术难题， 确保膨胀后较 高的强度和良好的塑韧性， 使用方便， 安全可靠。 An important technical problem existing in the current expansion pipe technology is: special threaded connection between the downhole casings, special thread processing is difficult, and construction and assembly are cumbersome. Generally speaking, the length of a single expansion tube is only about 10 meters, which can not meet the technical requirements of the site. Therefore, it is necessary to connect a plurality of single expansion tubes to the downhole by means of splicing or screwing, and bring a new technique. Difficulty: The strength of the joint is low, and more importantly, the loss of the joint is very difficult to solve. Therefore, there is an urgent need to propose a new comprehensive solution. SUMMARY OF THE INVENTION The object of the present invention is to provide a high strength and high plastic toughness (yield strength of 485 to 760 MPa, 10-30% of tube diameter plastic deformation, impact toughness 40)) chemical composition and manufacturing process of continuous expansion tube, overcome Ordinary expansion pipe construction requires insufficient welding or threaded connection, as well as low strength and leakage technical problems of the joints existing after construction, ensuring high strength and good plastic toughness after expansion, easy to use, safe and reliable.
本发明所述的一种高强度高塑韧性连续膨胀管， 采用直缝电阻悍 (ERW)制管技术制造的可膨胀的连续管， 由于其管体本身为连续管， 而 连续膨胀管中间没有丝扣， 没有悍接焊缝， 克服普通可膨胀管普遍存在 的连接部位的强度低和漏失技术难题。 由于连续膨胀管的长度很长， 为 适应连续膨胀管的加工制造、 运输以及膨胀管井下膨胀施工后的强度塑 性和韧性要求， 本发明在连续膨胀管的构思下， 通过改变连续膨胀管合 金材料成分和相应的制造工艺， 保障连续膨胀管技术的实现。  The invention discloses a high-strength, high-plastic and toughness continuous expansion pipe, which is an expandable continuous pipe manufactured by a straight seam resistance enthalpy (ERW) pipe-making technology, since the pipe body itself is a continuous pipe, and the continuous expansion pipe is not in the middle. Threaded fasteners, without splicing welds, overcome the technical problems of low strength and loss of joints common in common expandable tubes. Since the length of the continuous expansion pipe is long, in order to adapt to the processing and manufacturing of the continuous expansion pipe, and the strength plasticity and toughness requirements after the expansion of the expansion pipe, the present invention changes the continuous expansion pipe alloy material under the concept of the continuous expansion pipe. The composition and corresponding manufacturing process ensure the realization of continuous expansion tube technology.
本发明采用的技术方案是：  The technical solution adopted by the invention is:
1 ) 管材料的化学成分按质量百分比：  1) The chemical composition of the pipe material is by mass:
C: 0.03-0.12%； Si: 0. 17-0.40%； Mn: 0.80-1.90%； P: <0.010 %； S: <0.005 %； Cr: 0-1.0%； Mo: 0.10-0.50%； Ni: 0-0.30%； V： 0-0.05%； Ti: 0-0.03%； Cu: 0-0.30%； Nb: 0.01-0.06%； Fe: 余量；  C: 0.03-0.12%; Si: 0. 17-0.40%; Mn: 0.80-1.90%; P: <0.010%; S: <0.005%; Cr: 0-1.0%; Mo: 0.10-0.50%; Ni 0-0.30%; V: 0-0.05%; Ti: 0-0.03%; Cu: 0-0.30%; Nb: 0.01-0.06%; Fe: balance;
2) 管的制造工艺- 2) Manufacturing process of the tube -
( 1 ) 制备热轧板卷： 将步骤 1 ) 材料各组分经氧吹转炉熔炼， 炉外 精炼， 真空脱气， 连铸成厚度约为 250mm的厚板坯， 然后加热至约 1200 V， 恒温， 在 1000〜1100°C时进行粗轧， 在 700〜950°C时进行精轧， 轧 后冷却速度 15〜30°C/s， 卷取温度 500〜600°C， 制成厚度为 6〜： 15腿的 热轧板卷; (1) Preparation of hot rolled coil: The components of step 1) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200 V. Constant temperature, rough rolling at 1000~1100 °C, finish rolling at 700~950 °C, rolling a post-cooling speed of 15 to 30 ° C / s, a coiling temperature of 500 to 600 ° C, to a thickness of 6 ~: 15 legs of hot-rolled coil;
( 2 ) 板卷纵剪和对悍： 将制备好的热轧板卷通过纵剪机剪成 380〜710mm的钢带，为减少偏析对后续制管焊接的影响，应避免从板卷宽 度 1/2处纵剪， 为满足钢带和连续膨胀管长度要求， 需将钢带对焊起来， 将板头、 板尾加工成 45°, 采用埋弧自动焊或 C02气体保护焊焊接方式通 过 45°斜焊方式使钢带连接起来； (2) Longitudinal shearing and confrontation of the coil: The prepared hot rolled coil is cut into 380~710mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe welding, the width from the coil should be avoided. In the longitudinal shear of /2, in order to meet the length requirements of the steel strip and the continuous expansion tube, the steel strip must be butt welded, and the head and the tail are processed into 45°, and the submerged arc automatic welding or C0 2 gas shielded welding is adopted. °The oblique welding method connects the steel strips;
( 3)用钢带生产直缝电阻悍接钢管： 板边采用铣边方法， 精确控制 带钢宽度和板边垂直度； 采用排辊成型方法控制板边波形； 控制焊缝的 挤压量在 1. 6〜3. 2蘭，开口角 6»控制在 4〜8。，悍接速度 V为 15〜25m/min， 开口角 61与焊接速度 的乘积在 100~150 m/mirv度之间； 悍接成厚度为 5〜15mm的直缝电阻焊钢管；  (3) Production of straight seam resistance splicing steel pipe with steel strip: The edge of the slab is milled, precisely controlling the width of the strip and the verticality of the rim; using the roll forming method to control the edge of the slab; controlling the amount of squeezing of the weld at 1. 6~3. 2 blue, opening angle 6» control in 4~8. The splicing speed V is 15~25m/min, and the product of the opening angle 61 and the welding speed is between 100 and 150 m/mirv; the splicing is a straight seam electric resistance welded steel pipe with a thickness of 5 to 15 mm;
(4)焊后焊缝在 930〜960°C条件下正火，控制正火后水冷的开始温 度在 350〜400°C，以获得具有细小铁素体和少量珠光体的理想双相组织； 或进行 900〜950°C的一次整体正火。 具体实施方式  (4) After welding, the weld is normalized at 930~960 °C, and the starting temperature of water cooling after normalizing is controlled at 350~400 °C to obtain ideal dual phase structure with fine ferrite and a small amount of pearlite; Or perform an overall normalizing at 900~950 °C. detailed description
实施例 1:  Example 1:
连续膨胀管材料的化学成分质量百分数：  Percentage of chemical composition of continuous expansion tube material:
C: 0.05%； Si: 0. 21 %； Mn: 1.85%； P: 0.007%； S: 0.004%； Mo: 0.15%； Nb: 0.03 %； Ti: 0.02%； Fe: 余量。  C: 0.05%; Si: 0.21%; Mn: 1.85%; P: 0.007%; S: 0.004%; Mo: 0.15%; Nb: 0.03 %; Ti: 0.02%; Fe: balance.
连续膨胀管的制造：  Manufacturing of continuous expansion tubes:
首先， 制备热轧板卷： 将上述材料 （各组分） 经氧吹转炉熔炼， 炉 外精炼，真空脱气，连铸成厚度约为 250mm的厚板坯，然后加热至约 1200 °C , 在 1000〜1100°C时进行粗轧， 在 750〜950°C时进行精轧， 轧后冷却 速度 15〜20°C/s， 卷取温度 550〜600°C， 制成综合性能优良的厚度为 6. 35mm的热轧板卷。 First, preparing a hot rolled coil: the above materials (components) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200 ° C. Rough rolling at 1000~1100 °C, finish rolling at 750~950 °C, cooling after rolling The hot rolled coil having a thickness of 6.35 mm is obtained by a coiling temperature of 15 to 20 ° C / s, and a coiling temperature of 550 to 600 ° C.
板卷纵剪和对焊： 将制备好的热轧板卷通过纵剪机剪成 380mm的钢 带， 为减少偏析对后续制管焊接的影响， 应避免从板卷宽度 1/2处纵剪。 为满足钢带和连续膨胀管长度要求， 需将钢带对焊起来， 将板头、 板尾 加工成 45°， 采用埋弧自动焊或 C02气体保护悍焊接方式通过 45°斜焊方 式使钢带连接起来。 Roll slitting and butt welding: The prepared hot rolled coil is cut into 380mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe welding, it should avoid slitting from the width of the coil. . In order to meet the steel strip and continuous expansion tube length requirements, the steel strip must be butt welded, and the head and tail are processed into 45°. The submerged arc automatic welding or C0 2 gas protection 悍 welding method is used to make the steel through 45° oblique welding. The belts are connected.
用钢带生产直缝电阻焊接钢管： 板边采用铣边方法， 精确控制带钢 宽度和板边垂直度； 采用排辊成型方法控制板边波形； 调整焊接电流、 电压参数； 控制焊缝的挤压量在 1. 6〜2. 2mm， 开口角 制在 6°， 进行 焊接，悍接速度 V为 19〜21m/min;悍接成厚度为 6. 35醒、外径为 114. 3ram 的直缝电阻悍钢管。  Straight seam electric resistance welded steel pipe with steel strip: The edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roll forming method; the welding current and voltage parameters are adjusted; 5毫米的直直。 The thickness is 1. 6~2. 2mm, the opening angle is made at 6 °, the welding is carried out, the splicing speed V is 19~21m / min; the splicing into a thickness of 6. 35 awake, the outer diameter of 114. 3ram straight Sewage resistance 悍 steel pipe.
悍后悍缝在 930〜960°C条件下正火， 控制正火后水冷的开始温度在 350〜400°C， 以获得具有细小铁素体和少量珠光体的理想双相组织。  The quilting is normalized at 930~960 °C, and the starting temperature of the water cooling after normalizing is controlled at 350~400 °C to obtain the ideal duplex structure with fine ferrite and a small amount of pearlite.
连续膨胀管的主要技术指标： 最低屈服强度达到 485MPa， 最低抗拉 强度达到 555MPa， 最低延伸率 35%， 最低 Charpy冲击功 40J， 最高硬度 实施例 2:  The main technical indexes of continuous expansion pipe are: minimum yield strength reaches 485MPa, minimum tensile strength reaches 555MPa, minimum elongation is 35%, minimum Charpy impact energy 40J, highest hardness. Example 2:
连续膨胀管材料的化学成分质量百分数：  Percentage of chemical composition of continuous expansion tube material:
C: 0.08%； Si: 0. 31 %； Mn: 1.55%； P: 0.009%； S: 0.003 %； Mo: 0.18%； Ni: 0.19%； V： 0.05 %； Ti: 0.03 %； Cu: 0.16%； Nb: 0.04% ; Fe: 余量。  C: 0.08%; Si: 0.31%; Mn: 1.55%; P: 0.009%; S: 0.003 %; Mo: 0.18%; Ni: 0.19%; V: 0.05%; Ti: 0.03 %; Cu: 0.16 %; Nb: 0.04% ; Fe: balance.
连续膨胀管的制造：  Manufacturing of continuous expansion tubes:
首先， 制备热轧板卷： 将上述材料 （各组分） 经氧吹转炉熔炼， 炉 外精炼，真空脱气，连铸成厚度约为 250mm的厚板坯，然后加热至约 1200 。C， 在 1000〜1100°C时进行粗轧， 在 730〜950°C时进行精轧， 轧后冷却 速度 20〜30°C /s， 卷取温度 550〜600°C， 制成综合性能优良的厚度为 7. 52ram的热轧板卷。 First, preparing a hot rolled coil: the above materials (components) are smelted in an oxygen blowing converter, refined outside the furnace, vacuum degassed, continuously cast into a thick slab having a thickness of about 250 mm, and then heated to about 1200. . C, rough rolling at 1000~1100 °C, finish rolling at 730~950 °C, cooling rate after rolling is 20~30 °C / s, coiling temperature 550~600 °C, excellent overall performance The thickness of the hot rolled coil of 7. 52 ram.
板卷纵剪和对焊： 将制备好的热轧板卷通过纵剪机剪成 420mm的钢 带， 为减少偏析对后续制管焊接的影响， 应避免从板卷宽度 1/2处纵剪。 为满足钢带和连续膨胀管长度要求， 需将钢带对焊起来， 将板头、 板尾 加工成 45°， 采用埋弧自动悍或 C02气体保护悍焊接方式通过 45°斜悍方 式使钢带连接起来。 Plate slitting and butt welding: The prepared hot rolled coil is cut into 420mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent tube welding, it should avoid slitting from the width of sheet coil 1/2. . In order to meet the requirements of the length of the steel strip and the continuous expansion tube, the steel strip needs to be butt welded, and the head and the tail are processed into 45°, and the steel is passed through the 45° oblique boring method by submerged arc automatic boring or C0 2 gas protection 悍 welding. The belts are connected.
用钢带生产直缝电阻焊接钢管： 板边采用铣边方法， 精确控制带钢 宽度和板边垂直度； 采用排辊成型方法控制板边波形； 调整焊接电流、 电压参数； 控制焊缝的挤压量在 L 7〜2. 3ram， 开口角啦制在 6°， 进行 焊接， 焊接速度 V为 19〜21m/min; 焊接成厚度为 7. 52mm, 外径为 127mm 的直缝电阻焊钢管。 Straight seam electric resistance welded steel pipe with steel strip: The edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roll forming method; the welding current and voltage parameters are adjusted; The pressure is in the range of L 7~2. 3ram, the opening angle is made at 6°, the welding is performed, the welding speed V is 19~21 m/min , and the straight seam electric resistance welded steel pipe having a thickness of 7.52 mm and an outer diameter of 127 mm is welded.
焊后焊缝在 930〜960°C条件下正火， 控制正火后水冷的开始温度在 350〜400°C， 以获得具有细小铁素体和少量珠光体的理想双相组织。  After welding, the weld is normalized at 930~960 °C, and the initial temperature of water cooling after normalizing is controlled at 350~400 °C to obtain the ideal duplex structure with fine ferrite and a small amount of pearlite.
连续膨胀管的主要技术指标： 最低屈服强度达到 555MPa， 最低抗拉 强度达到 620MPa， 最低延伸率 30%， 最低 Charpy冲击功 40J， 最高硬度 实施例 3:  The main technical indexes of continuous expansion pipe are: minimum yield strength reaches 555MPa, minimum tensile strength reaches 620MPa, minimum elongation is 30%, minimum Charpy impact energy 40J, highest hardness. Example 3:
连续膨胀管材料的化学成分质量百分数：  Percentage of chemical composition of continuous expansion tube material:
C: 0.10%； Si: 0. 23 %； Mn: 1.40%； P: 0.008%； S: 0.003 %； Cr: 0.30%； Mo: 0.21 %； Ni: 0.25 %； Ti: 0.03 %； Cu: 0.20%； Nb: 0.04%； Fe: 余量。  C: 0.10%; Si: 0.23%; Mn: 1.40%; P: 0.008%; S: 0.003%; Cr: 0.30%; Mo: 0.21%; Ni: 0.25 %; Ti: 0.03 %; Cu: 0.20 %; Nb: 0.04%; Fe: balance.
连续膨胀管的制造：  Manufacturing of continuous expansion tubes:
首先， 制备热轧板卷： 将上述材料 （各组分） 经氧吹转炉熔炼， 炉 外精炼，真空脱气，连铸成厚度约为 250mm的厚板坯，然后加热至约 1200 °C， 在 1000〜1100°C时进行粗轧， 在 700〜950°C时进行精轧， 轧后冷却 速度 20〜30°C/s， 卷取温度 500〜550°C， 制成综合性能优良的厚度为 7. 72mm的热轧板卷。 First, preparing a hot rolled coil: the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into thick slabs with a thickness of about 250mm, then heating to about 1200 °C, rough rolling at 1000~1100 °C, finishing rolling at 700~950 °C, rolling The post-cooling speed is 20 to 30 ° C / s, and the coiling temperature is 500 to 550 ° C, and a hot rolled coil having a thickness of 7.72 mm is obtained.
板卷纵剪和对焊： 将制备好的热轧板卷通过纵剪机剪成 460mm的钢 带， 为减少偏析对后续制管悍接的影响， 应避免从板卷宽度 1/2处纵剪。 为满足钢带和连续膨胀管长度要求， 需将钢带对悍起来， 将板头、 板尾 加工成 45°， 采用埋弧自动悍或 C02气体保护焊悍接方式通过 45°斜焊方 式使钢带连接起来。 Slotting and butt welding of the coil: The prepared hot rolled coil is cut into 460mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe splicing, it should be avoided from 1/2 of the width of the coil. Cut. In order to meet the length requirements of the steel strip and the continuous expansion tube, the steel strip needs to be twisted together, and the head and the tail are processed into 45°, and the submerged arc automatic crucible or C0 2 gas shielded welding is used to make the 45° oblique welding method. The steel strips are connected.
用钢带生产直缝电阻悍接钢管： 板边采用铣边方法， 精确控制带钢 宽度和板边垂直度； 采用排辊成型方法控制板边波形； 调整悍接电流、 电压参数； 控制悍缝的挤压量在 1. 8〜2. 5ram， 开口角啦制在 7°， 进行 悍接，焊接速度 V为 18〜20m/min;悍接成厚度为 7. 72瞧、外径为 139. 7mm 的直缝电阻焊钢管。  Steel pipe is used to produce straight seam resistance splicing steel pipe: the edge of the plate is milled, the width of the strip and the verticality of the edge of the slab are precisely controlled. The edge of the slab is controlled by the roll forming method; the splicing current and voltage parameters are adjusted; The squeezing amount is 7. 8~2. 5 ram, the opening angle is made at 7°, the splicing is performed, the welding speed V is 18~20 m/min; the splicing is 7.72 瞧, and the outer diameter is 139. 7mm straight seam electric resistance welded steel pipe.
焊后进行 900〜950°C的一次整体加热淬火， 600〜650°C回火。  After welding, a total heating quenching at 900~950 °C is performed, and tempering is performed at 600~650 °C.
连续膨胀管的主要技术指标： 最低屈服强度达到 620MPa， 最低抗拉 强度达到 670MPa， 最低延伸率 30%， 最低 Charpy冲击功 40J， 最高硬度 HRC23 o  Main technical indexes of continuous expansion pipe: Minimum yield strength reaches 620MPa, minimum tensile strength reaches 670MPa, minimum elongation is 30%, minimum Charpy impact energy 40J, highest hardness HRC23 o
实施例 4:  Example 4:
连续膨胀管材料的化学成分质量百分数：  Percentage of chemical composition of continuous expansion tube material:
C: 0.11 %； Si: 0. 26%； Mn: 0.80%； P: 0.010%； S: 0.004%； Cr: 0.65%； Mo: 0.29%； Ni: 0.27%； Nb: 0.05%； Ti: 0.02%； Cu: 0.22%； Fe: 余量。  C: 0.11%; Si: 0.26%; Mn: 0.80%; P: 0.010%; S: 0.004%; Cr: 0.65%; Mo: 0.29%; Ni: 0.27%; Nb: 0.05%; Ti: 0.02 %; Cu: 0.22%; Fe: balance.
连续膨胀管的制造：  Manufacturing of continuous expansion tubes:
首先， 制备热轧板卷： 将上述材料 （各组分） 经氧吹转炉熔炼， 炉 外精炼，真空脱气，连铸成厚度约为 250mm的厚板坯，然后加热至约 1200 °C , 在 1000〜1100°C时进行粗轧， 在 700〜950°C时进行精轧， 轧后冷却 速度 20〜30°C/s， 卷取温度 500〜550°C， 制成综合性能优良的厚度为 10. 36mm的热轧板卷。 First, preparing a hot rolled coil: the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into thick slabs with a thickness of about 250mm, then heating to about 1200 °C, rough rolling at 1000~1100 °C, finishing rolling at 700~950 °C, rolling The hot-rolled coil having a thickness of 10.36 mm, which has a good overall performance, is obtained by a post-cooling speed of 20 to 30 ° C / s, and a coiling temperature of 500 to 550 ° C.
板卷纵剪和对悍： 将制备好的热轧板卷通过纵剪机剪成 580mm的钢 带， 为减少偏析对后续制管悍接的影响， 应避免从板卷宽度 1/2处纵剪。 为满足钢带和连续膨胀管长度要求， 需将钢带对焊起来， 将板头、 板尾 加工成 45°， 采用埋弧自动悍或 C02气体保护焊焊接方式通过 45°斜焊方 式使钢带连接起来。 Slotting and sizing of the coil: The prepared hot-rolled coil is cut into 580mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent pipe splicing, it should be avoided from 1/2 of the width of the coil. Cut. In order to meet the requirements of steel strip and continuous expansion tube length, it is necessary to butt the steel strip, and machine the head and the tail to 45°. The steel is brazed by 45° oblique welding by submerged arc automatic or C0 2 gas shielded welding. The belts are connected.
用钢带生产直缝电阻焊接钢管： 板边采用铣边方法， 精确控制带钢 宽度和板边垂直度； 采用排辊成型方法控制板边波形； 调整焊接电流、 电压参数； 控制悍缝的挤压量在 1. 8〜2. 5mm， 开口角 制在 8°， 进行 悍接，悍接速度 V为 18〜20m/min;悍接成厚度为 10. 36mm、外径为 177. 8mm 的直缝电阻悍钢管。  Straight seam resistance welded steel pipe with steel strip: The edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roller forming method; the welding current and voltage parameters are adjusted; 5毫米的直直。 The thickness is in the range of 1. 8~2. 5mm, the opening angle is made at 8 °, the splicing speed V is 18~20m / min; 悍 connected to a thickness of 10. 36mm, the outer diameter of 177. 8mm straight Sewage resistance 悍 steel pipe.
焊后进行 900〜950°C的一次整体加热淬火， 600〜650°C回火。  After welding, a total heating quenching at 900~950 °C is performed, and tempering is performed at 600~650 °C.
连续膨胀管的主要技术指标： 最低屈服强度达到 690MPa， 最低抗拉 强度达到 760MPa， 最低延伸率 28%， 最低 Charpy冲击功 40J， 最高硬度 实施例 5:  The main technical indexes of continuous expansion pipe are: minimum yield strength reaches 690MPa, minimum tensile strength reaches 760MPa, minimum elongation is 28%, minimum Charpy impact energy 40J, highest hardness. Example 5:
连续膨胀管材料的化学成分质量百分数:  Percentage of chemical composition of continuous expansion tube material:
C: 0.12%； Si: 0.28%； Mn: 0.98%； P: 0.008%； S: 0.005 %； Cr: 0.93%； Mo: 0.44%； Ni: 0.23%； Ti: 0.03 %； Cu: 0.19%； Nb: 0.06%； Fe: 余量。  C: 0.12%; Si: 0.28%; Mn: 0.98%; P: 0.008%; S: 0.005 %; Cr: 0.93%; Mo: 0.44%; Ni: 0.23%; Ti: 0.03 %; Cu: 0.19%; Nb: 0.06%; Fe: balance.
连续膨胀管的制造：  Manufacturing of continuous expansion tubes:
首先， 制备热轧板卷： 将上述材料 （各组分） 经氧吹转炉熔炼， 炉 外精炼，真空脱气，连铸成厚度约为 250mm的厚板坯，然后加热至约 1200 V， 在 1000〜1100°C时进行粗轧， 在 700〜950°C时进行精轧， 轧后冷却 速度 20〜30°C/s， 卷取温度 500〜550°C， 制成综合性能优良的厚度为 14. 15mm的热轧板卷。 First, preparing a hot rolled coil: the above materials (components) are smelted in an oxygen blowing converter, and the furnace External refining, vacuum degassing, continuous casting into a thick slab with a thickness of about 250mm, then heating to about 1200 V, rough rolling at 1000~1100 °C, finishing rolling at 700~950 °C, after rolling The hot-rolled coil having a thickness of 14.15 mm is obtained by a coiling temperature of 20 to 30 ° C / s, and a coiling temperature of 500 to 550 ° C.
板卷纵剪和对悍： 将制备好的热轧板卷通过纵剪机剪成 710mm的钢 带， 为减少偏析对后续制管焊接的影响， 应避免从板卷宽度 1/2处纵剪。 为满足钢带和连续膨胀管长度要求， 需将钢带对焊起来， 将板头、 板尾 加工成 45°， 采用埋弧自动焊或 C02气体保护焊焊接方式通过 45°斜焊方 式使钢带连接起来。 Plate slitting and facing: The prepared hot rolled coil is cut into 710mm steel strip by slitting machine. In order to reduce the influence of segregation on subsequent tube welding, it should avoid slitting from the width of sheet coil 1/2. . In order to meet the requirements of steel strip and continuous expansion tube length, it is necessary to butt the steel strip, and machine the head and tail to 45°. Use submerged arc automatic welding or C0 2 gas shielded welding to make the steel through 45° oblique welding. The belts are connected.
用钢带生产直缝电阻焊接钢管： 板边采用铣边方法， 精确控制带钢 宽度和板边垂直度； 采用排辊成型方法控制板边波形； 调整焊接电流、 电压参数； 控制悍缝的挤压量在 2. 0〜3. 0mm， 开口角 0控制在 8°， 进行 焊接，焊接速度 V为 18〜20m/min;焊接成厚度为 14. 15醒、外径为 219. lmm 的直缝电阻焊钢管。  Straight seam resistance welded steel pipe with steel strip: The edge of the board adopts the milling method to precisely control the width of the strip and the verticality of the edge of the board; the waveform of the edge of the board is controlled by the roller forming method; the welding current and voltage parameters are adjusted; 0毫米的直缝, the opening is 0. 0mm, the opening angle 0 is controlled at 8°, the welding is performed, the welding speed V is 18~20m/min, and the welding is formed into a straight seam with a thickness of 14.15 awake and an outer diameter of 219. Electric resistance welded steel pipe.
悍后进行 900〜950°C的一次整体加热淬火， 680〜630°C回火。  After the crucible is subjected to an overall heating quenching at 900 to 950 ° C, tempering at 680 to 630 ° C.
连续膨胀管的主要技术指标： 最低屈服强度达到 760MPa， 最低抗拉 强度达到 800MPa， 最低延伸率 25%， 最低 Charpy冲击功 40J， 最高硬度 工业实用性  Main technical indexes of continuous expansion pipe: Minimum yield strength reaches 760MPa, minimum tensile strength reaches 800MPa, minimum elongation 25%, minimum Charpy impact work 40J, highest hardness Industrial applicability
连续膨胀管的主要技术指标： 最低屈服强度达到 485〜760MPa，最低 抗拉强度达到 555〜800MPa， 最低延伸率 25〜35%， 最低 Charpy冲击功 40 J , 最高硬度 HRC22〜HRC30。  The main technical indicators of continuous expansion tube: the minimum yield strength reaches 485~760MPa, the minimum tensile strength reaches 555~800MPa, the lowest elongation is 25~35%, the lowest Charpy impact work 40J, the highest hardness HRC22~HRC30.
连续膨胀管的外径范围为 114. 3-219. lmm， 壁厚范围为 6~15醒。 连续膨胀管的长度范围为 100m~1000m。 可以缠绕到适当的芯轴上， 以便运输和使用。 可以根据井下作业地层厚度、 施工需要， 截取适当的长度。 The outer diameter of the continuous expansion tube ranges from 114. 3-219. lmm, and the wall thickness ranges from 6 to 15 awake. The length of the continuous expansion tube ranges from 100m to 1000m. It can be wound onto a suitable mandrel for transport and use. According to the thickness of the underground working layer and the construction needs, the appropriate length can be intercepted.
本发明所述的一种高强度高塑韧性连续膨胀管的化学成分及制造工 艺， 连续膨胀管其管体本身是连续的， 克服了普通膨胀管施工时需要焊 接或螺紋连接的不足， 以及施工后存在的连接部位强度低和漏失技术难 题， 确保了膨胀后较高的强度和良好的塑韧性； 并且长度可根据现场需 要截取， 方便可靠。 本发明的连续膨胀管可应用于钻井、 完^ ^、 采油、 修井等作业中， 既能解决井眼变径问题， 又能节约大量作业成本。  The chemical composition and manufacturing process of a high-strength, high-plasticity and toughness continuous expansion pipe according to the present invention, the pipe body of the continuous expansion pipe itself is continuous, overcoming the shortage of welding or screwing required for the construction of the ordinary expansion pipe, and construction The post-existing joints have low strength and leakage technical problems, ensuring high strength and good plastic toughness after expansion; and the length can be intercepted according to the needs of the site, which is convenient and reliable. The continuous expansion tube of the invention can be applied to drilling, finishing, oil recovery, workover, etc., which can solve the problem of the well diameter reduction and save a lot of operation cost.

Claims

1. 一种高强度高塑轫性连续膨胀管的制备方法， 屈服强度达到 485〜760Mpa， 管直径发生 10-30%的塑性形变， 冲击功 40J，其特征在 于： 1. A method for preparing a high-strength and high-plasticity continuous expansion pipe, with a yield strength of 485~760Mpa, a plastic deformation of 10-30% in the diameter of the pipe, and an impact energy of 40J. It is characterized by:
1 ) 管材料的化学成分按质量百分比: 1) Chemical composition of pipe materials in mass percentage:
C: 0.03-0.12%； Si: 0. 17-0.40%； Mn: 0.80-1.90%； P: <0.010 ； S: <0.005 %； Cr: 0-1.0%； Mo: 0.10-0.50%； Ni: 0-0.30%； V： 0-0.05%； Ti: 0-0.03%； Cu: 0-0.30%； Nb: 0.01-0.06%； Fe: 余量； C: 0.03-0.12%; Si: 0.17-0.40%; Mn: 0.80-1.90%; P: <0.010; S: <0.005%; Cr: 0-1.0%; Mo: 0.10-0.50%; Ni: 0-0.30%; V: 0-0.05%; Ti: 0-0.03%; Cu: 0-0.30%; Nb: 0.01-0.06%; Fe: balance;
2) 管的制造： 2) Manufacturing of tubes:
( 1 ) 制备热轧板卷： 将步骤 1 ) 材料各组分经氧吹转炉熔炼， 炉外 精炼， 真空脱气， 连铸成厚度约为 250mm的厚板坯， 然后加热至 1200°C， 恒温， 在 1000〜1100°C时进行粗轧， 在 700〜950°C时进行精轧， 轧后冷 却速度 15〜30°C/s， 卷取温度 500〜600°C， 制成厚度为 6〜15腿的热轧 板卷； (1) Preparation of hot-rolled coils: Each component of the material in step 1) is smelted in an oxygen-blown converter, refined outside the furnace, vacuum degassed, and continuously cast into a thick slab with a thickness of approximately 250mm, and then heated to 1200°C. Constant temperature, rough rolling at 1000~1100°C, finish rolling at 700~950°C, cooling rate after rolling 15~30°C/s, coiling temperature 500~600°C, and the thickness is 6 ~15-leg hot-rolled coil;
( 2 ) 板卷纵剪和对焊： 将制备好的热轧板卷通过纵剪机剪成 380~710mm的钢带， 将钢带对焊起来， 将板头、 板尾加工成 45°, 采用埋 弧自动焊或 C02气体保护悍焊通过 45°斜焊方式使钢带连接起来； (2) Slitting and butt welding of plate coils: Cut the prepared hot rolled plate coils into 380~710mm steel strips through a slitting machine, butt weld the steel strips, and process the plate head and tail to 45°, using Submerged arc automatic welding or C0 2 gas shielded welding connects steel strips through 45° oblique welding;
( 3)用钢带生产直缝电阻悍接钢管： 板边采用铣边方法， 精确控制 带钢宽度和板边垂直度； 采用排辊成型方法控制板边波形； 控制悍缝的 挤压量在 1. 6〜3. 2匪，开口角 (9控制在 4〜8°，焊接速度 V为 15〜25m/min， 开口角 < 与悍接速度 y的乘积在 100~150 πι/min·度之间； 悍接成厚度为 5〜15腿的直缝电阻焊钢管； (3) Use steel strips to produce straight seam resistance jointed steel pipes: The edge of the plate is milled to accurately control the width of the strip and the verticality of the plate edge; the roller forming method is used to control the waveform of the plate edge; the extrusion amount of the seam is controlled within 1.6~3.2mm, the opening angle (9) is controlled at 4~8°, the welding speed V is 15~25m/min, the product of the opening angle < and the welding speed y is within 100~150 m/min·degree space; jointed into a straight seam resistance welded steel pipe with a thickness of 5 to 15 legs;
(4)焊后悍缝在 930〜960°C条件下正火，控制正火后水冷的开始温 度在 350〜400°C， 或进行 900〜950°C的一次整体正火。 (4) After welding, the weld seam is normalized at 930~960°C. The starting temperature of water cooling after normalizing is controlled at 350~400°C, or an overall normalizing is performed at 900~950°C.
PCT/CN2011/000942 2010-08-12 2011-06-03 Method for manufacturing continuous expansion pipe with high strength and ductility WO2012019422A1 (en)

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