CN111321345B - Tempering type high-quality continuous pipe and manufacturing method thereof - Google Patents
Tempering type high-quality continuous pipe and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a quenching and tempering type high-quality continuous pipe and a manufacturing method thereof, wherein the quenching and tempering type high-quality continuous pipe comprises the following steps: uncoiling a steel plate, flattening, cutting the steel plate into steel strips, welding the steel strips to form continuous steel strips, detecting flaws of butt welding seams, winding the steel strips on a roller, forming, welding, removing external burrs, carrying out induction heating, quenching pipe bodies, drying the pipe bodies, sizing, carrying out stress removal treatment and curling on the pipe bodies, carrying out off-line tempering treatment on the whole coils, rewinding the pipe bodies, detecting and preventing corrosion, cutting off and carrying out integral pressure testing. The hot-rolled coiled plate adopted by the invention has lower performance, is easy to form a tube, and can develop a high-strength and ultrahigh-strength continuous tube product through the subsequent whole tube quenching and tempering heat treatment; meanwhile, the pipe blank is subjected to quenching and tempering treatment processes, so that the base material, the circumferential welding line and the longitudinal welding line of the pipe are subjected to deep heat treatment at the same time, the pipe body is ensured to have as uniform as possible tempered structure and lower residual stress, and the structure of the welding line and the base material is really consistent.
Description
The technical field is as follows:
the invention relates to the technical field of petroleum and natural gas pipes, in particular to a quenched and tempered high-quality continuous pipe and a manufacturing method thereof.
Background art:
compared with the conventional threaded connection oil pipe, the Coiled pipe (CT) can be wound on a large-diameter winding drum and is an oil-gas pipe material which is formed by connecting a plurality of sections of steel strips together, forming and welding and has the length of thousands of meters. The coiled tubing can be continuously and efficiently put into or taken out of an oil well, is used in the fields of oil field well repair, well drilling, well completion, well logging, yield increase, oil production, gas production and the like, runs through the whole process of oil and gas exploitation, has the unique advantages of high operating efficiency, wide application range, capability of operating under pressure and the like, is favored by oil field users, and plays an increasingly important role in the exploration and development of the oil and gas field by the coiled tubing technology.
The conventional continuous tube manufacturing process mainly includes: uncoiling a steel plate, cutting the steel plate into steel strips, welding the steel strips into continuous steel strips, continuously forming and welding the steel strips, carrying out heat treatment on welding seams and pipe bodies, winding the steel strips on a roller, and carrying out integral pressure test. In the existing continuous pipe manufacturing technology, no matter an imported continuous pipe or a domestic continuous pipe, a disc of continuous pipe contains a plurality of circumferential welding seams formed by butt joint of a plurality of steel strips and continuous and longitudinal welding seams penetrating through the whole length of a pipe body, and the welding seams of the pipe body are usually 'weak' positions of the whole disc of pipe. In the process of pipe manufacturing, no matter high-frequency welding, laser welding, gas shielded welding, plasma welding, friction stir welding or other welding modes are adopted, welding heat input causes the difference of the structures of a welding line and a base material, particularly for a fine-grain reinforced continuous pipe raw material, the difference of the structures and the performances of the welding line and the base material is larger, and the negative influence caused by the welding process cannot be eliminated by the existing pipe manufacturing technology. In the service process of the continuous pipe, due to the fact that the performance difference between a welding line and a pipe body is large, the problems of stress concentration, joint softening, selective corrosion and the like are prone to occurring at the position of the welding line, the bending fatigue life of the position of the welding line is far shorter than that of a pipe body base metal, and the failure of the position of the welding line is often the main reason of scrapping of the whole continuous pipe.
The invention discloses a high-strength high-fatigue-life coiled tubing for a deep well high-pressure well and a manufacturing method thereof in Chinese patent ZL201710658211.8, the yield strength of the high-strength coiled tubing is more than 130ksi, the coiled tubing is designed by reasonable materials and a tubing process, the bending fatigue life of the coiled tubing is obviously prolonged, and is 3-5 times of that of a conventional CT90 coiled tubing. The coiled tube special for the high-strength coiled tube is high in alloy content and plate strength, and high in equipment capability required in the rolling and curling processes, so that the plate manufacturing difficulty is high, the yield is low, the produced high-strength plate is high in price, the production cost of the produced high-strength coiled tube is high, and the purchase price of a final product is high. Meanwhile, the high-strength coiled plate is difficult to pass in the welding and pipe manufacturing processes, and the performance difference of the pipe body and the welding line after pipe manufacturing is not effectively improved.
Aiming at the problem of the welding seam of the continuous pipe, Chinese patent ZL201410674059.9 discloses 'a continuous oil pipe without welding defects and a manufacturing method thereof', the process of heating, stamping and tempering is adopted for the butt welding seam of a steel strip, the process of locally heating and pressing a pipe by a squeezing roller to exert certain deformation quantity on the welding seam is adopted for the longitudinal welding seam, and the process of quenching is carried out in the welding seam area. The method can improve the weld joint structure and the weld joint performance, but the difference between the weld joint structure and the base metal structure is still large, so that the bending fatigue life of the whole coiled tubing product is influenced.
The invention content is as follows:
the invention aims to overcome the defects of the prior art and provides a quenched and tempered high-quality continuous pipe and a manufacturing method thereof, wherein the continuous pipe is manufactured by adopting a hot-rolled coil plate with lower performance, so that a pipe body is easy to form; through the subsequent quenching and tempering heat treatment of the whole pipe, the base metal, the circumferential welding line and the longitudinal welding line of the pipe body simultaneously realize deep heat treatment, the tempering structure of the pipe body is uniform, the residual stress is lower, and the structure of the welding line and the base metal tends to be consistent.
In order to achieve the purpose, the invention adopts the technical scheme that: a quenching and tempering type high-quality continuous pipe and a manufacturing method thereof are disclosed, wherein the continuous pipe plate comprises the following chemical components in percentage by mass: 0.16-0.32% of C; 0.12 to 0.50 percent of Si; 0.50 to 1.8 percent of Mn; p is less than or equal to 0.012 percent; s is less than or equal to 0.008 percent; 0.15 to 0.5 percent of Cu; 0.40 to 5.0 percent of Cr; 0.10 to 0.60 percent of Ni; 0.20 to 1.0 percent of Mo; 0 to 0.15 percent of V; 0.01 to 0.03 percent of Ti; 0.02 to 0.10 percent of Nb; 0.0005-0.003% of B, and the balance of Fe and inevitable impurities.
The plate comprises the following chemical components in percentage by mass:
c: more than 0.16% and less than 0.32%
Carbon (C) is a conventional strengthening element in steel, and significantly improves the strength of steel through solid solution strengthening and precipitation strengthening. When the carbon content is less than 0.16%, hardenability is insufficient, and the strength of the steel cannot be significantly improved. However, the toughness, plasticity, weldability and the like of the pipe are adversely affected by the excessively high carbon content, a large amount of retained austenite is likely to be caused by the excessively high carbon content, a brittle structure is likely to be generated after quenching, and the fatigue performance and the SSC resistance of the continuous pipe are reduced. The invention controls the content of C in a higher range, not only exerts the strengthening effect of C, but also ensures the toughness and weldability of the pipe, so the design range of C is 0.16-0.32%.
Si: more than 0.12% and less than 0.50%
Silicon (Si) is used as a deoxidizer in steel making and also improves the strength of steel, and when the content is less than 0.12, the effect is not significant, and when the content is more than 0.5, the toughness and the stress corrosion resistance are not good, so that the content is limited to 0.12-0.50%.
Mn: more than 0.50 percent and less than 1.8 percent
Manganese (Mn) can remarkably improve the hardenability of steel, plays a role in solid solution strengthening and improves the strength of the steel. However, Mn is easy to be compatible with S in steel to form MnS inclusions; when the content of manganese is high, the manganese is easy to be segregated in grain boundaries together with impurities such as P, S, so that the design range of Mn is 0.5-1.8%.
P: 0.012% or less; s: less than 0.008%
Phosphorus (P) and sulfur (S) are extremely harmful elements, are easy to generate inclusions, are the root sources of hydrogen induced cracking and sulfide stress corrosion, and are easy to crack and initiate to influence the bending fatigue performance of the continuous tube. However, the strict control of phosphorus (P) and sulfur (S) inevitably leads to the increase of the manufacturing cost of the plate, so that the P content is controlled below 0.012 percent and the S content is controlled below 0.008 percent.
Cu: more than 0.15 percent and less than 0.5 percent
Copper (Cu) improves strength, hardenability, and high-temperature stability of steel through solid solution strengthening, and can improve weather resistance and corrosion resistance, but excessive addition is detrimental to low-temperature toughness and hot workability of steel. The design range of Cu in the invention is 0.15-0.5%.
Cr: more than 0.4% and less than 5.0%
Chromium (Cr) has a significant solid solution strengthening effect and can significantly improve tensile strength. When the Cr content reaches more than 3.0 percent, the CO2 corrosion resistance of the steel is obviously improved. However, when the content is large, defects such as inclusions and dust plates are easily generated in HFW welding and a hardened structure which is difficult to remove is formed. Therefore, the design range of the Cr of the invention is 0.4-5.0%%.
Ni: more than 0.10 percent and less than 0.60 percent
Nickel (Ni) is an element that increases hardenability, can increase the strength of steel without significantly decreasing its toughness, and improves overall mechanical properties and resistance to oxidative corrosion and pitting corrosion. However, Ni is a noble metal element and is relatively expensive. The design range of Ni in the invention is 0.10-0.60%.
Mo: more than 0.20 percent and less than 1.0 percent
Molybdenum (Mo) is most effective against H2The S element can improve the passivation performance of steel and improve the corrosion resistance of the steel, particularly the local corrosion resistance, but the price is high, so the design range of the Mo of the invention is 0.20-1.0%.
V:0 to 0.15 percent
The vanadium (V) can refine grains, and the V is dispersed and precipitated in a large amount of VC form in the tempering process, so that the remarkable precipitation strengthening effect is achieved, and the tempering strength of the steel is improved. However, since too high a content thereof causes precipitation of aggregated carbides, lowers impact toughness at room temperature, and causes large fluctuation in mechanical properties, the design range of the present invention V is 0 to 0.15%.
Ti: more than 0.01 percent and less than 0.03 percent
The titanium (Ti) strong carbon and nitrogen compound form elements, thereby refining austenite grains, improving the toughness of the steel and obviously improving the toughness of a heat affected zone. However, if the content is too high, coarse TiN is easily formed, and the hydrogen sulfide stress corrosion resistance is reduced. The design range of Ti of the invention is 0.01-0.08%.
Nb: more than 0.02 percent and less than 0.10 percent
Niobium (Nb) can form C, N compounds, prevent crystal grains from growing, form a fine grain structure and fine carbides during austenitizing, and improve the strength and toughness and the hydrogen sulfide corrosion resistance of the steel. However, the price is very high and increases the cost of the tube, so the design range of the Nb of the invention is 0.02-0.10%.
B: more than 0.0005% and less than 0.003%
The content of boron (B) is controlled to 0.0005-0.003%, and the hardenability of the steel can be remarkably improved without increasing the quench cracking sensitivity of the steel, without impairing the weldability of the steel and the surface quality of the slab, and without forming coarse boride at grain boundaries.
The method for manufacturing the quenched and tempered high-quality continuous pipe comprises the following steps of:
the method comprises the following steps: preparing a rolled plate: carrying out pre-desulfurization treatment on molten iron serving as a main raw material, and carrying out smelting in a top-bottom combined blown converter, fine adjustment of alloy, LF temperature rise desulfurization, RH vacuum decarburization and Ca treatment to enable the components of the molten steel to reach the mass percentage, so that steel can be discharged; pouring a continuous casting blank, and casting the continuous casting blank into a plate blank by adopting a continuous casting technology and applying dynamic soft reduction and electromagnetic stirring; preparing a hot-rolled coil with the thickness of 2.4-7.1mm by a multi-pass thermo-mechanical controlled rolling process (TMPC), pickling, finishing and detecting, and then coiling the coil into a coil plate for pipe manufacturing by a tension coiling machine;
step two: plate rolling longitudinal shearing and butt welding lengthening: shearing the prepared coiled plate into a steel belt with a specified width by a longitudinal shearing unit according to the specification requirement of the pipe blank, and adopting friction stir welding, plasma filler wire welding or CO2Gas shielded welding, namely connecting the steel strip to a target length by a 40-50-degree oblique welding butt joint method; optimizing the performance of the steel strip butt weld, wherein the process flow sequentially comprises the following steps: rapidly heated to Ac3Performing hot rolling or hot forging at the temperature of 20-50 ℃, naturally cooling to less than 200 ℃, rapidly heating to 600 +/-100 ℃, naturally cooling to room temperature, polishing the weld reinforcement and performing nondestructive weld joint detection;
step three: preparing a tube blank: milling edges of a steel strip, bending and molding by a row of rollers, welding the steel strip into a tube blank by a high frequency induction welding (HFW) method, welding the steel strip by nitrogen with the purity of more than or equal to 99.7% in the whole welding process under the continuous gas protection, controlling the opening angle to be 4-8 degrees, controlling the extrusion amount of a welding line to be 2.0-6.0mm, and controlling the welding speed to be 15-35 m/min; carrying out heat treatment on the welding seam through medium-frequency induction heating, rapidly heating the welding seam to 960 ℃, then controlling the cooling speed of the welding seam under the protection of nitrogen, and carrying out water cooling when the welding seam is cooled to 400 ℃;
step four: quenching the pipe body: adopt the compound heating mode that intermediate frequency heating furnace and muffle furnace combined together, intermediate frequency heating furnace heats up the body to Ac3And preserving heat in a muffle furnace at the temperature of 30-50 ℃. The total heating time is t, the unit is min, t is AxDelta, wherein A is a heating coefficient and has a value of 1-3, and Delta is the wall thickness of the tube blank and has a unit of mm; heating and quenching, wherein the quenching medium is water or oil, and the quenching termination temperature is room temperature to 320 ℃;
step five: stress relief treatment and curling of the pipe body: drying the surface of the tube body by using cold air, rapidly heating to 400-plus-600 ℃ by using an intermediate frequency furnace, controlling the cooling speed to be less than 300 ℃, and then performing water cooling, wherein the tube is coiled on a special winding drum;
step six: off-line tempering treatment of the whole roll: the whole coil of the continuous pipe is operated to a heating furnace for tempering treatment, wherein the tempering temperature is 500-680 ℃; the heat preservation time of the pipe is t ', the unit is min, and t' is A 'multiplied by delta', wherein A 'is a heating coefficient, the value is 5-9, and delta' is the wall thickness of the pipe body, and the unit is mm; after tempering treatment, according to the target performance of the whole coil of the continuous pipe, the continuous pipe can be selected to be cooled to room temperature in the air or placed into a heat preservation pit for slow cooling to room temperature. And (3) carrying out nondestructive testing on the whole coil of continuous pipe after tempering treatment, coating a preservative on the surface of the coil of continuous pipe, and winding the coil of continuous pipe on a winding drum suitable for transportation to obtain the tempered high-quality continuous pipe with required length.
The main technical indexes of the quenching and tempering type high-quality continuous pipe are as follows: yield strength 551-. Can be wound onto a roll of appropriate core diameter for shipping and use. The continuous tube geometry comprises: the outer diameter range of the constant wall thickness continuous pipe and the variable wall thickness continuous pipe is phi 25.4-phi 139.7 mm.
The invention has the beneficial effects that:
1. according to the chemical component design provided by the invention, the adopted hot-rolled coil has lower performance, the tube-making forming is easy, the method is suitable for the subsequent quenching and tempering process, and the continuous tube products with low strength, medium strength, high strength and ultrahigh strength can be produced; wherein, the range of elements such as Cr, Ni, Mo and the like is wide, and the continuous pipe with special performances such as low Cr, CO2 resistance or sulfur resistance and the like can be produced. The matched coil plate manufacturing technology realizes deep degassing, decarburization, desulfurization and dephosphorization, improves the uniformity of chemical components, reduces the center segregation of casting blanks, ensures the high quality of the coil plate of the continuous tube, and is beneficial to improving the bending fatigue performance and the stress corrosion resistance of the continuous tube.
2. According to the invention, after the pipe body is subjected to the quenching and tempering heat treatment process, the circumferential and longitudinal welding seams of the pipe and the pipe body base metal are simultaneously heated to austenite, then the same heat treatment process is carried out, the obtained final tissues are the same, the tissue and performance difference between the welding seams and the pipe body is effectively reduced, the residual stress is eliminated, the mechanical property, the bending fatigue resistance and the stress corrosion resistance of the continuous pipe are effectively improved, and the service life and the operation safety of the developed quenching and tempering type high-quality continuous pipe are greatly prolonged.
The specific implementation mode is as follows:
the invention is described in further detail below:
firstly, preparing a rolled plate:
table 1 shows the chemical composition percentages by mass of the sheets of examples 1, 2 and 3 according to the invention.
Proportioning according to the chemical components of the plate, performing pre-desulfurization treatment, smelting by a top-bottom combined blown converter, fine adjusting alloy, heating and desulfurizing by LF (ladle furnace), performing RH (relative humidity) vacuum decarburization and performing Ca treatment to ensure that the components of molten steel reach the mass percent in the table 1, and then tapping; pouring a continuous casting blank, and casting the continuous casting blank into a plate blank by adopting a continuous casting technology and applying dynamic soft reduction and electromagnetic stirring; the hot-rolled coil with a certain thickness is prepared by a multi-pass thermo-mechanical controlled rolling process (TMPC), and is coiled into a coil plate for pipe making by a tension coiling machine after acid washing, finishing and detection. The thickness and mechanical properties of the sheets of examples 1, 2 and 3 are shown in table 2.
TABLE 1 plate chemistry (wt%)
TABLE 2 thickness and mechanical Properties of the sheets
Second, the rolled plate is longitudinally cut and welded to be long
And (4) performing plate rolling longitudinal shearing, welding length optimization and butt welding seam optimization according to the method in the second step, wherein the specific process is shown in Table 3.
Thirdly, preparing the tube blank
And manufacturing the tube blank according to the method of the third step, wherein the specific process is shown in Table 4.
TABLE 3 optimized treatment process for plate rolling longitudinal shearing, butt welding length and butt welding seam
TABLE 4 tube blank shaping and welding process
Fourthly, quenching, destressing and tempering the pipe body
Examples 1, 2 and 3 were quenched, destressed and tempered according to the processes shown in table 5. Specifically, example 1 is taken as an example to illustrate:
TABLE 5 quenching, destressing, tempering treatment of pipe body
Quenching the pipe body: the tube blank is rapidly heated at the speed of 20-50 ℃/s by adopting a composite heating mode of combining an intermediate frequency heating furnace and a muffle furnace. Heating temperature is Ac3+ (30-50) DEG C, wherein Ac3 is 910-]1/2+44.7[Si％]+104[V％]+31.5[Mo％]
910-. Heating for t, A × delta 1.5 × 4.8 7.2 ≈ 7min, quenching after heating, with water as quenching medium, and quenching termination temperature at room temperature.
Stress relief treatment of the pipe body: drying the surface of the tube body by using cold air, rapidly heating to 480 ℃ by using an intermediate frequency furnace, controlling the cooling speed to be less than 300 ℃, and then performing water cooling, wherein the tube is curled on a special winding drum.
Off-line tempering treatment of the whole roll: the whole coil of the continuous pipe is operated to a heating furnace for tempering treatment, wherein the tempering temperature is 630 ℃; the heat preservation time of the pipe is t ', the unit is min, t' is A 'multiplied by delta' is 8 multiplied by 4.8 is 38.4 is approximately equal to 38min, the whole coil of the continuous pipe is placed in a designated area, and the continuous pipe is cooled to the room temperature in the air.
Fifthly, rewinding and detecting pipe
And (4) carrying out nondestructive testing on the tempered whole coil of continuous pipe, coating a preservative on the surface of the coil of continuous pipe, and winding the coil of continuous pipe on a winding drum suitable for transportation to obtain the tempered high-quality continuous pipe with required length.
Sixthly, main properties
The product performance test results of the 3 kinds of continuous tubes prepared by the method are shown in table 6.
Therefore, the quenched and tempered high-quality coiled tubing product produced by the method not only can produce the conventional coiled tubing product meeting the API standard requirement, but also can produce the ultra-high strength 150ksi steel-grade coiled tubing product and the low-chromium CT90 coiled tubing product with certain corrosion resistance. The continuous pipe produced by the method is subjected to a quenching and tempering process, so that the weld joint structure of the pipe body and the base metal structure tend to be consistent, the nucleation and the initiation of cracks of the pipe body can be effectively prevented, the bending fatigue life of the continuous pipe is prolonged, meanwhile, the consistency of the pipe body structure and the reduction of residual stress improve the SSC resistance of the continuous pipe, and the service life and the operation safety of the continuous pipe are greatly prolonged in the operation process.
TABLE 6 main performance test results of pipe material
Claims (1)
1. A manufacturing method of a tempering type high-quality continuous pipe is characterized by comprising the following steps: the continuous tube plate comprises the following chemical components in percentage by mass: 0.16-0.32% of C; 0.12 to 0.50 percent of Si; 0.50 to 1.8 percent of Mn; p is less than or equal to 0.012 percent; s is less than or equal to 0.008 percent; 0.15 to 0.5 percent of Cu; 0.40 to 5.0 percent of Cr; 0.10 to 0.60 percent of Ni; 0.20 to 1.0 percent of Mo; 0 to 0.15 percent of V; 0.01 to 0.03 percent of Ti; 0.02 to 0.10 percent of Nb; 0.0005 to 0.003 percent of B, and the balance of Fe and inevitable impurities, and comprises the following steps:
the method comprises the following steps: preparing a rolled plate: carrying out pre-desulfurization treatment on molten iron serving as a main raw material, and carrying out smelting in a top-bottom combined blown converter, fine adjustment of alloy, LF temperature rise desulfurization, RH vacuum decarburization and Ca treatment to enable the components of the molten steel to reach the mass percentage, so that steel can be discharged; pouring a continuous casting blank, and casting the continuous casting blank into a plate blank by adopting a continuous casting technology and applying dynamic soft reduction and electromagnetic stirring; preparing a hot-rolled coil with the thickness of 2.4-7.1mm by a multi-pass thermo-mechanical controlled rolling process, and after acid washing, finishing and detection, coiling the hot-rolled coil into a coil plate for tube manufacturing by a tension coiling machine;
step two: plate rolling longitudinal shearing and butt welding lengthening: shearing the prepared coiled plate into a steel strip with a specified width by a longitudinal shearing unit according to the specification requirement of the tube blank, and connecting the steel strip to a target length by adopting a 40-50-degree oblique welding butt joint method through friction stir welding, plasma filler wire welding or CO2 gas shielded welding; optimizing the performance of the steel strip butt weld, wherein the process flow sequentially comprises the following steps: rapidly heating to 20-50 ℃ above Ac3, carrying out hot rolling or hot forging, naturally cooling to less than 200 ℃, rapidly heating to 600 +/-100 ℃, naturally cooling to room temperature, grinding the weld reinforcement and carrying out nondestructive weld joint detection;
step three: preparing a tube blank: milling edges of a steel strip, bending and molding the steel strip by a row of rollers, welding the steel strip into a tube blank by a high-frequency induction welding method, welding the steel strip by nitrogen with the purity of more than or equal to 99.7% in the whole welding process under the continuous gas protection, controlling the opening angle to be 4-8 degrees, controlling the extrusion amount of a welding line to be 2.0-6.0mm, and controlling the welding speed to be 15-35 m/min; carrying out heat treatment on the welding seam through medium-frequency induction heating, rapidly heating the welding seam to 960 ℃, then controlling the cooling speed of the welding seam under the protection of nitrogen, and carrying out water cooling when the welding seam is cooled to 400 ℃;
step four: quenching the pipe body: a composite heating mode combining an intermediate frequency heating furnace and a muffle furnace is adopted, the intermediate frequency heating furnace heats the tube body to a temperature of 30-50 ℃ above Ac3, and the muffle furnace is insulated; the total heating time is t, the unit is min, t is AxDelta, wherein A is a heating coefficient and has a value of 1-3, and Delta is the wall thickness of the tube blank and has a unit of mm; heating and quenching, wherein the quenching medium is water or oil, and the quenching termination temperature is room temperature to 320 ℃;
step five: stress relief treatment and curling of the pipe body: drying the surface of the tube body by using cold air, rapidly heating to 400-plus-600 ℃ by using an intermediate frequency furnace, controlling the cooling speed to be less than 300 ℃, and then performing water cooling, wherein the tube is coiled on a special winding drum;
step six: off-line tempering treatment of the whole roll: the whole coil of the continuous pipe is operated to a heating furnace for tempering treatment, wherein the tempering temperature is 500-680 ℃; the heat preservation time of the pipe is t ', the unit is min, and t' is A 'multiplied by delta', wherein A 'is a heating coefficient, the value is 5-9, and delta' is the wall thickness of the pipe body, and the unit is mm; after tempering treatment, according to the target performance of the whole coil of the continuous pipe, the continuous pipe can be selected to be cooled to room temperature in the air or placed into a heat preservation pit for slow cooling to room temperature.
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| CN113235910A (en) * | 2021-04-12 | 2021-08-10 | 浙江智造热成型科技有限公司 | Novel light high-strength steel template and manufacturing process thereof |
| CN115433870B (en) * | 2021-06-02 | 2023-08-11 | 宝山钢铁股份有限公司 | Low-cost quenched and tempered steel for continuous oil pipe, hot rolled steel strip, steel pipe and manufacturing method thereof |
| CN113584288A (en) * | 2021-07-19 | 2021-11-02 | 山东宏丰海洋石油装备有限公司 | Off-line quenching and tempering manufacturing process for coiled tubing |
| CN113584289A (en) * | 2021-07-19 | 2021-11-02 | 山东宏丰海洋石油装备有限公司 | Online quenching and tempering manufacturing process for coiled tubing |
| CN113977208A (en) * | 2021-12-08 | 2022-01-28 | 中新(重庆)超高强材料研究院有限公司 | Manufacturing method of ultrahigh-strength automobile A column |
| CN114571290A (en) * | 2022-04-21 | 2022-06-03 | 广东福维德焊接股份有限公司 | Continuous pipeline welding system and method |
| CN115139062A (en) * | 2022-07-27 | 2022-10-04 | 杰森能源技术有限公司 | Oil pipe manufacturing method |
| CN115354242B (en) * | 2022-08-02 | 2023-04-21 | 杰森能源技术有限公司 | Stainless steel coiled tubing and preparation method thereof |
| CN115537674A (en) * | 2022-09-02 | 2022-12-30 | 杰森能源技术有限公司 | On-line production continuous quenching and tempering high-performance coiled tubing and manufacturing method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104357756A (en) * | 2014-10-20 | 2015-02-18 | 宝鸡石油钢管有限责任公司 | Longitudinally-welded petroleum casing pipe capable of resisting stress corrosion of hydrogen sulfide and manufacturing method thereof |
| EP2875926A1 (en) * | 2013-11-21 | 2015-05-27 | Böhler Edelstahl GmbH & Co KG | Method for the production of plastic moulds made from martensitic chromium steel and plastic mould |
| CN107723598A (en) * | 2017-10-23 | 2018-02-23 | 中国石油天然气集团公司 | A kind of hydrogen sulfide corrosion-resistant oil pipe and its production method for improving fatigue behaviour |
| CN110184542A (en) * | 2019-06-19 | 2019-08-30 | 中国石油天然气集团有限公司 | A kind of performance seamlessization is continuously managed and its manufacturing method |
-
2020
- 2020-03-05 CN CN202010145850.6A patent/CN111321345B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2875926A1 (en) * | 2013-11-21 | 2015-05-27 | Böhler Edelstahl GmbH & Co KG | Method for the production of plastic moulds made from martensitic chromium steel and plastic mould |
| CN104357756A (en) * | 2014-10-20 | 2015-02-18 | 宝鸡石油钢管有限责任公司 | Longitudinally-welded petroleum casing pipe capable of resisting stress corrosion of hydrogen sulfide and manufacturing method thereof |
| CN107723598A (en) * | 2017-10-23 | 2018-02-23 | 中国石油天然气集团公司 | A kind of hydrogen sulfide corrosion-resistant oil pipe and its production method for improving fatigue behaviour |
| CN110184542A (en) * | 2019-06-19 | 2019-08-30 | 中国石油天然气集团有限公司 | A kind of performance seamlessization is continuously managed and its manufacturing method |
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