CN102284780A - High-frequency resistance welding (HFW) steel pipe welding production process for low-temperature-resistant station - Google Patents
High-frequency resistance welding (HFW) steel pipe welding production process for low-temperature-resistant station Download PDFInfo
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Abstract
The invention discloses a high-frequency resistance welding (HFW) steel pipe welding production process for a low-temperature-resistant station. The process comprises the following steps of: analyzing physical and chemical properties of a rolling plate to guarantee the weight percentage of the chemical ingredients can reach the standard; welding the rolling plate through contacting welding, wherein the welding speed is controlled to be 12.7 to 14.3 m/min; treating the welding part by using three medium-frequency heat treatment machines, wherein the medium-frequency temperature at the first stage is between 720 and 780 DEGC, the medium-frequency temperature at the second stage is between 910 and 950 DEG C and the medium-frequency temperature at the third stage is between 920 and 950 DEG C; and detecting the physical and chemical properties of the weld joint. By the process, output power is reduced; welding speed is increased; the weld joint quality of the steel pipe can be guaranteed better; the energy-saving and emission-reducing policy advocated at present is followed; and finally the pipeline can be adapted to normal operation under the low-temperature working condition.
Description
Technical field
The present invention relates to a kind of production technology of transportation pipe line, field, especially a kind of low temperature resistant station HFW steel pipe welding production technology.
Background technology
In recent years along with the fast development of petroleum gas, the discharge pressure of transportation pipe line is also constantly improving, the HFW(high-frequency resistance welding (HFRW)) one of main method of making as the medium caliber welded tube of steel pipe also develops trending towards high grade of steel, big wall thickness, big caliber and high performance direction.In addition since oil gas field and feed-line gradually to the extremely frigid zones development, so also more and more higher to the low-temperature flexibility requirement of HFW welded tube.The summer of HFW tube product standard code is generally 0 ℃ than impacting the toughness test temperature, and the test temperature that requires that some engineering has as required is subzero 20 ℃, and more the HFW steel pipe under the low temperature is not also seen the report of succeeding in developing at home.Therefore developing subzero 40 ℃ field, station is the machine of well carving of enhancing one's own technical skills and exploiting market with the HFW welded tube.But develop novel welded tube and mainly have following technological difficulties:
1, roll bending: the HFW steel pipe is to adopt hot-rolled coil as the pipe raw material, utilize the kelvin effect of high frequency electric and butt joint edge that kindred effect makes pipe to reach that the extruding seam forms after the molten condition, so the physicochemical property quality of weld seam depends primarily on the physicochemical property of hot-rolled coil.Therefore in the buying roll bending, must propose strict requirement, and take into full account the characteristics of this production line, make the physicochemical property of roll bending satisfy the needs of production its main chemical compositions content, grain size, field trash and mechanical property;
2, welding procedure: high-frequency induction welder can be according to the output of welding temperature and speed of welding control bonding power, and factors such as amount of compression, speed of welding, weld zone V-type angular aperture are the keys of control weldquality.The weld seam of HFW steel pipe is that two edges of boards metals are heated to high temperature simultaneously, whether the surface C element is extruded by scaling loss or rich C liquid phase and the bright line that forms is a melt run, suitable with the output that bonding power is weighed according to melt run form and width in the picric acid corrosive liquid corrosion back of heat;
3, heat-treat condition: it is thick that the gradient distribution of welding process temperature causes welded seam area to organize, stress is concentrated, carry out post weld heat treatment with the Frequency Induction Heating butt welded seam and reach the seam organization refinement and eliminate stress concentratedly, it is the key of weldquality quality that heat treatment temperature is selected;
4, physics and chemistry test: intensity, plasticity and toughness characterize the quality of welded tube weldquality.Steel pipe is often in the unexpected fracture that is subjected under the percussion of external force to take place no omen, so Charpy-type test is to pass judgment on one of most important index of HFW welded tube weldquality, guarantees that the v-notch center of Charpy-type test sample is a key in melt run centering.
Summary of the invention
The technical problem to be solved in the present invention provides field, the low temperature resistant station HFW steel pipe welding production technology that can normally move under the assurance transportation pipe line low temperature condition.
For solving the problems of the technologies described above, the technical solution used in the present invention is: field, a kind of low temperature resistant station is characterized in that comprising the steps: with HFW steel pipe welding production technology
(1) physicochemical property of roll bending is analyzed, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.12%, Si≤0.35%, Mn≤1.60%, S≤0.005%, P≤0.020%, Nb+V+Ti≤0.15, and guarantees that the material yield low intensity limit detected improves 35MPa than the lower limit of yield of standard.
(2) roll bending is welded, welding manner is a Contact welding, and speed of welding is 12.7-14.3m/min, guarantees that in welding process the welding power output is at 350-500KW.
(3) with Frequency Induction Heating the welding position is heat-treated, heat treatment need be provided with three phases, and phase I intermediate frequency temperature is 720-780 ℃, and second stage intermediate frequency temperature is 910-950 ℃, and phase III intermediate frequency temperature is 920-950 ℃.
(4) steel pipe body and weld seam are carried out the physicochemical property check, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.16%, Si≤0.40%, Mn≤1.60%, S≤0.005%, P≤0.020%, and carries out hydraulic test, off-line ultrasonic examination and shape and dimension control.
The equipment that adopts in the described heat treatment process is the intermediate frequency heat-treating machine.
The equipment that adopts in the described welding process is solid-state high-frequency welder.
Adopt the beneficial effect that technique scheme produced to be:
1, the present invention carries out physical and chemical performance analysis to roll bending before welding, after welding is finished welded tube is tested, and has guaranteed that pipeline can adapt to the operate as normal under the worst cold case, has improved the scope of application of pipeline.
2, the welding manner among the present invention is that Contact welding replaces original induction welding, use solid-state high-frequency welder, bonding power reduces in welding process, reduced power output, also improved simultaneously speed of welding, not only can guarantee the weldquality of steel pipe well, also comply with the energy-saving and emission-reduction policy of advocating at present.
3, among the present invention to the welding after heat treatment, adopt the intermediate frequency heat-treating machine, butt welded seam carries out tempering heat treatment, use the temperature of three phases to keep, to guarantee welding position and the no tempered martensite of heat affected area tissue, and welding position and heat affected area grain size 〉=9 grade, guarantee that the mechanical property of steel pipe welding position meets the demands.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Fig. 1 is that steel pipe seam summer ratio impacts the experiment comparing result under two kinds of welding manners.
The specific embodiment
In order further to set forth the present invention, the present invention is elaborated below in conjunction with preferred embodiment.
In the present embodiment, among the present invention, in conjunction with the applicable elements of battlefield with petroleum pipeline, requirement is operate as normal in the time of subzero 40 ℃, therefore the physical and chemical index of roll bending has been proposed, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.12%, Si≤0.35%, Mn≤1.60%, S≤0.005%, P≤0.020%, Nb+V+Ti≤0.15, and guarantee that the material yield low intensity limit detected rolls off the production line than the yield strength of standard and improve 35MPa that the edges of boards of roll bending must satisfy its specification requirement simultaneously.
At L415MB(X60) the material roll bending, wall thickness is respectively two specifications of 12.5mm and 14.2mm, at first analyzed roll bending physicochemical property, as shown in table 1, every index all meets the roll bending specification requirement.
Table 1 roll bending testing result
Then, roll bending is welded, use solid-state high-frequency welder, welding manner is a Contact welding, and speed of welding is 12.7-14.3m/min, guarantees that in welding process the welding power output is at 350-500KW.
Then, use the intermediate frequency heat-treating machine that the welding position is carried out Frequency Induction Heating and handle, heat treatment need be provided with three phases, and phase I intermediate frequency temperature is 720-780 ℃, and second stage intermediate frequency temperature is 910-950 ℃, and the 3rd intermediate frequency temperature is 920-950 ℃.
At last, steel pipe body and weld seam are carried out the physicochemical property check, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.16%, Si≤0.40%, Mn≤1.60%, S≤0.005%, P≤0.020%, and carry out hydraulic test, off-line ultrasonic examination and and shape and dimension control, can finish low temperature resistant HFW steel pipe welding production process.
In order to verify effect of the present invention, to the steel pipe of Φ 406.4mm, wall thickness is respectively two specifications of 12.5mm and 14.2mm, adopts two kinds of welding manners of induction welding and Contact welding respectively, and its experimental result compares as follows:
1) at first carrying out specification is that Φ 406.4 * 12.5 grade of steels are the debugging and the production of L415MB steel pipe, selecting welding manner is the induction welding welding, speed of welding, bonding power and the intermediate frequency temperature of producing steel pipe see table 2 for details, select 3 intermediate frequency equipment to carry out post weld heat treatment according to the wall thickness of steel pipe, guaranteeing weld seam and the no tempered martensite of heat affected area tissue, and weld seam and heat affected area grain size 〉=9 grade.
Analyze through butt welded seam and heat affected area tissue, the weld seam metallographic structure is ferrite+pearlite, and no tempered martensite shows that seam organization control is suitable, and specification requirement is all satisfied in hydraulic test, off-line ultrasonic examination and product inspection.Table 3 and Fig. 1 provide the physicochemical property testing result of steel pipe, as seen from Figure 1, select the ballistic work of the steel pipe Charpy-type test of induction welding welding manner production to have the situation that does not meet technical conditions.
The parameter of two kinds of welding manners of table 2
Table 3 tension test numerical value
2) be that Φ 406.4 * 12.5 grade of steels are the debugging and the production status of L415MB steel pipe in conjunction with specification, for specification is that Φ 457 * 14.2 grade of steels are the L415MB steel pipe, selecting welding manner is the Contact welding welding, speed of welding, bonding power and the intermediate frequency temperature of producing steel pipe see table 2 for details, select 3 intermediate frequency equipment to carry out post weld heat treatment, guaranteeing weld seam and the no tempered martensite of heat affected area tissue, and weld seam and heat affected area grain size 〉=9 grade.
Analyze through butt welded seam and heat affected area tissue, the weld seam metallographic structure is ferrite+pearlite, and no tempered martensite shows that seam organization control is suitable, and specification requirement is all satisfied in hydraulic test, off-line ultrasonic examination and product inspection.Table 3 and Fig. 1 provide the physicochemical property testing result of steel pipe, as seen from Figure 1, select the steel pipe physics and chemistry of Contact welding welding manner production to test the requirement that all meets technical conditions.
Development by the low temperature resistant HFW steel pipe welding mode of production, drawing with the Contact welding welding makes bonding power drop to 430KW by the 900KW that induction welding needs, about about 60,000 yuan of the electricity charge of saving in every month, as seen not only can guarantee the weldquality of steel pipe with Contact welding well, also comply with the energy-saving and emission-reduction policy of advocating at present.
Affirmed that a pipe field can substitute seamless steel pipe or longitudinal submerged arc welded pipe to the HFW steel pipe at low temperature resistant station, widened the application market of HFW steel pipe, had immeasurable market potential application, what mainly form is invisible economic benefit.
Claims (3)
1. field, a low temperature resistant station is characterized in that comprising the steps: with HFW steel pipe welding production technology
(1) physicochemical property of roll bending is analyzed, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.12%, Si≤0.35%, Mn≤1.60%, S≤0.005%, P≤0.020%, Nb+V+Ti≤0.15, and guarantees that the material yield low intensity limit detected improves 35MPa than the lower limit of yield of standard;
(2) roll bending is welded, welding manner is a Contact welding, and speed of welding is 12.7-14.3m/min, guarantees that in welding process the welding power output is at 350-500KW;
(3) with Frequency Induction Heating the welding position is heat-treated, heat treatment need be provided with three phases, and phase I intermediate frequency temperature is 720-780 ℃, and second stage intermediate frequency temperature is 910-950 ℃, and phase III intermediate frequency temperature is 920-950 ℃;
(4) steel pipe body and weld seam are carried out the physicochemical property check, the percentage by weight that guarantees its chemical composition can reach following index: C≤0.16%, Si≤0.40%, Mn≤1.60%, S≤0.005%, P≤0.020%, and carries out hydraulic test, off-line ultrasonic examination and shape and dimension control.
2. field, low temperature resistant station according to claim 1 is characterized in that with HFW steel pipe welding production technology the equipment that adopts in the described heat treatment process is the intermediate frequency heat-treating machine.
3. field, low temperature resistant station according to claim 1 is characterized in that with HFW steel pipe welding production technology the equipment that adopts in the described welding process is solid-state high-frequency welder.
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Cited By (2)
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| CN102784812A (en) * | 2012-08-03 | 2012-11-21 | 中国石油集团渤海石油装备制造有限公司 | Manufacturing method of X65 steel-grade HFW (High Frequency Welding) steel pipe for ore pulp conveying pipeline |
| CN103276187A (en) * | 2013-06-08 | 2013-09-04 | 武汉钢铁(集团)公司 | Process for improving comprehensive mechanical performances of weld of high-frequency straight welded tube |
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| JPS5268046A (en) * | 1975-12-04 | 1977-06-06 | Nippon Steel Corp | Method of preventing generation of penetrator in high frequency seam welded steel pipe |
| JPS5850186A (en) * | 1981-09-22 | 1983-03-24 | Nippon Steel Corp | Impedor for medium frequency welding of seamless steel tube |
| JPS58122188A (en) * | 1982-01-12 | 1983-07-20 | Nippon Steel Corp | Manufacture of low temperature heated and forge-welded pipe |
| CN101622084A (en) * | 2007-03-02 | 2010-01-06 | 新日本制铁株式会社 | Method for producing steel conduit tube and high si component or high cr component steel conduit tube |
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| CN102784812A (en) * | 2012-08-03 | 2012-11-21 | 中国石油集团渤海石油装备制造有限公司 | Manufacturing method of X65 steel-grade HFW (High Frequency Welding) steel pipe for ore pulp conveying pipeline |
| CN103276187A (en) * | 2013-06-08 | 2013-09-04 | 武汉钢铁(集团)公司 | Process for improving comprehensive mechanical performances of weld of high-frequency straight welded tube |
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Effective date of registration: 20200927 Address after: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee after: China oil steel tube Co.,Ltd. Yangzhou branch Address before: 300457, No. 3, Tianjin Binhai service outsourcing industry park, No. 19 West Ring Road, Tianjin, Tanggu Patentee before: CNPC Bohai Petroleum Equipment Manufacturing Co.,Ltd. Patentee before: NORTH CHINA PETROLEUM STEEL PIPE Co.,Ltd. |