CN102465236A - Method for producing X70 or X80 high-strain steel tube - Google Patents
Method for producing X70 or X80 high-strain steel tube Download PDFInfo
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Abstract
The invention relates to a method for producing an X70 or X80 high-strain steel tube, which comprises the following steps of: taking following materials by weight percent: 0.035-0.08% of C, 1.55-1.90% of Mn, 0.15-0.3% of Si, less than or equal to 0.0030% of S, less than or equal to 0.0015% of P, 0.025-0.070% of Nb, 0.015-0.035% of Ti, 0.02-0.050% of V, 0.10-0.30% of Mo, 0.10-0.30% of Cu, 0.15-0.35% of Ni, 0-0.30% of Cr, less than or equal to 0.00050% of limiting element B, less than or equal to 0.009% of Ca, less than or equal to 0.008% of N, less than or equal to 0.002% of O, and the balance of Fe; hot-rolling; air-cooling; performing laminar flow cooling; stamping; expanding; and coating an antiseptic coat. The use requirements of the steel tube in a seismic broken region, a sunken region, a frozen earth region and a landslide region are met.
Description
Technical field
(transverse yield strength is that (transverse yield strength is 555～705MPa) gross distortion steel pipe's production methods for 485～635MPa) gross distortion steel pipes or X80 to the present invention relates to a kind of X70.
Background technology
The variation of energy structure in recent years and to the growth of energy demand has greatly promoted the development of long distances pipeline.For improving transport efficiency, reduce construction investment, length constantly develops to high grade of steel with steel apart from the petroleum gas delivering pipe line.But some pipe engineering construction have to pass complicated geological geomorphologic conditions areas such as some severe cold, landslide, seismic zone, are example with the transfering natural gas from the west to the east two wires, and western two wires pipeline is along the line through quite long meizoseismal area and 22 moving faults.When disasters such as generation earthquake, these geographic pipelines will produce bigger displacement, must carry out strain control, promptly carry out based on the strained design, and employing simultaneously have the large-deformation-resistance pipeline steel of uniform plastic deformation capacity greatly.
For the large-deformation-resistance pipeline steel pipe that uses based on strain design area; To consider that not only common area uses requirements such as intensity and the toughness of steel pipe; Also to make regulation, promptly the stress-strain(ed) curve and the viscous deformation capacity performance index of longitudinal stretching test before and after the strain aging stipulated the linear deformation ability of steel pipe.Generally, it is more difficult that the high more pipe line steel of grade of steel will obtain bigger viscous deformation capacity, and simultaneously, the effect of high grade of steel pipeline steel tube strain aging in anticorrosion coating procedure can produce intensity and hardness raises, the phenomenon that plasticity and toughness descend; In addition, steel pipe also can produce the strain aging phenomenon in secular military service process.This has just proposed higher challenge to the large-deformation-resistance pipeline steel board production technology.Chinese patent 20091007666.8 has proposed a kind of method of the X80 of production level large-deformation resistance pipe line steel plate.But the X80 large-deformation-resistance pipeline steel of this explained hereafter has only been considered uniform plastic deformation unit elongation, two factors of yield tensile ratio, the notion of gross distortion pipe line steel is not made much of, thereby the product of producing not is the large-deformation-resistance pipeline steel of real meaning.Chinese patent 96190145.4 has proposed a kind of HS line pipes steel with low yield strength ratio and good low-temperature flexibility, and the pipe line steel of this explained hereafter has lower yield tensile ratio, but also has certain gap with real large-deformation-resistance pipeline steel.
The difference of tube-making process also can have a strong impact on the performance of large-deformation-resistance pipeline steel.The production process of High Tensile Steel Tube comprises moulding and welding, and its molding mode mainly contains UOE and JCOE, and welding process mainly adopts Lincoln weld.Overseas enterprise has gone out X80 gross distortion steel pipe through the UOE process exploitation at present; The requirement that convenient formation that Chinese patent 200710185346.3 is only considered through the steel pipe of JCOE explained hereafter and intensity index reach related standards; And reckon without the influence of moulding process to steel pipe plasticity; And coating processes is not suitable for production Chinese People's Anti-Japanese Military and Political College distortion steel pipe to the influence of steel pipe aging performance and viscous deformation capacity after the steel pipe moulding.How to guarantee that the viscous deformation performance of steel pipe after the moulding is that the key issue that solves is badly in need of in the large-deformation-resistance pipeline steel exploitation in tolerable limit.
Summary of the invention
The purpose of this invention is to provide a kind of X70/X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe's production method.When the X70 of this explained hereafter and X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe can satisfy common steel tube intensity and toughness reguirements; The stress-strain(ed) curve and the viscous deformation capacity performance index of longitudinal stretching test all can satisfy the requirement of " the straight-line joint submerged arc welding tube additional requirements that transfering natural gas from the west to the east two wires natural gas pipeline projects are used based on strain design area " before and after the X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe strain aging, and the stress-strain(ed) curve and the viscous deformation capacity performance index of longitudinal stretching test all significantly are superior to before and after the X70 Chinese People's Anti-Japanese Military and Political College distortion steel pipe strain aging
The requirement of " the straight-line joint submerged arc welding tube additional requirements that transfering natural gas from the west to the east two wires natural gas pipeline projects are used based on strain design area ".
The overall technological scheme thinking of X70/X80 of the present invention Chinese People's Anti-Japanese Military and Political College distortion steel pipe's production method is: through rational metallurgically design, adopt micro-alloying technology to guarantee the sufficiently high tensile strength of having of pipe line steel; Guarantee that with technology for controlled cooling pipe line steel has suitable horizontal and vertical ys and plasticity and horizontal low-temperature flexibility through optimal control is rolling.
The overall technological scheme thinking of X70/X80 large-deformation-resistance pipeline steel pipe production method of the present invention is: improve the dimensional precision in the steel pipe moulding process through rational JCO technology; Reduce the hole enlargement amount; Reduce the prestrain amount that causes in the tubulation process; The anticorrosion application temperature of strict control; Reduce the influence of timeliness to steel tube performance, when guaranteeing that Chinese People's Anti-Japanese Military and Political College's distortion steel pipe satisfies common pipeline steel strength and toughness reguirements, the stress-strain(ed) curve and the viscous deformation capacity performance index of longitudinal stretching test all can satisfy the requirement of " the straight-line joint submerged arc welding tube additional requirements that transfering natural gas from the west to the east two wires natural gas pipeline projects are used based on strain design area " before and after the strain aging.
Concrete scheme is:
(1) a kind of X70/X80 large-deformation-resistance pipeline steel plate, the weight percent of its moity is: C:0.035～0.08%, Mn:1.55～1.90%, Si:0.15～0.3%; S :≤0.0030%, P :≤0.015%, Nb:0.025～0.070%, Ti:0.015～0.035%; V:0.02～0.050%, Mo:0.10～0.30%, Cu:0.10～0.30%, Ni:0.15～0.35%; Cr:0～0.30%, constraint element B :≤0.00050%, Ca :≤0.009%; N :≤0.008%, O :≤0.002%, all the other are iron and inevitable impurity.
For guaranteeing the tensile strength of product; The component concentration of necessary strict control Mn, Nb, Mo, Cu, Cr, Ti is in above-mentioned scope; Wherein X70 Chinese People's Anti-Japanese Military and Political College deformed steel flat alloying element content can get its component near lower range, X80 Chinese People's Anti-Japanese Military and Political College deformed steel flat alloying element content can get its component near upper range.
(2) continuously cast bloom in above-mentioned (1) Composition Control scope is carried out even heating.The thickness of strand scope is 200～300mm, preferred 260mm.Heating and temperature control is at 1150～1230 ℃, and soaking time 1.5～2.5h carries out hot rolling then in two stages.Fs, the austenite recrystallization district was rolling; Start rolling temperature is controlled at 1160～1190 ℃, and finishing temperature is controlled at 980～1050 ℃, it should be noted that in this stage rolling to carry out transverse rolling and axial rolling; Wherein the transverse rolling total deformation need be controlled at more than 25%, and the axial rolling total deformation should be greater than 45%.Subordinate phase austenite non-recrystallization district is rolling; Start rolling temperature is 880～920 ℃; Finishing temperature should be 790～830 ℃; This stage rolling compression ratio is controlled in 5 times, is noted that this stage rolling compression ratio can not be too big, and not handy frame water removes the surface of steel plate iron scale in the interior operation of rolling of last 0～25% deflection scope.
(3) after the rolling completion, steel plate carries out air cooling, should control entry for the X80 large-deformation-resistance pipeline steel before temperature at 750～790 ℃, guarantee that 45～75% austenitic transformation is a proeutectoid ferrite body tissue; Temperature guarantees that at 740～780 ℃ 55～80% austenitic transformation is a proeutectoid ferrite body tissue before should controlling entry for the X70 large-deformation-resistance pipeline steel.
(4) steel plate behind the air cooling is carried out the laminar flow cooling; Speed of cooling is controlled at 15～25 ℃/s; Final cooling temperature is controlled at 350～530 ℃; Change remaining austenite into MA or its mixed structure of granular bainite, carry out air cooling then, finally obtain proeutectoid ferrite+MA/ granular bainite heterogeneous structure or proeutectoid ferrite+MA+ granular bainite polyphase structure.Higher relatively final cooling temperature can effectively be realized online self-tempering, realizes that through return action the optimization of carbon atom and dislocation is arranged, and further improves the plasticity and the toughness of steel.
(5) steel plate behind the finished edge, utilizes preparatory joggling machine to carry out crimp through milling the limit; According to the caliber size requirement, make edges of boards have satisfactory curvature, on the JCO shaper, carry out repeatedly stepping punching press then; Be pressed into " J " shape; With second half bending equally of steel plate, be pressed into " C " shape again, form " O " type of opening at last.For the steel plate of the following thickness of 22mm, the punching press number of times need guarantee more than 25 times; The steel plate of the above thickness of 22mm, punching press number of times need guarantee more than 39 times, to improve steel pipe sizes precision in the moulding process.
(6) steel pipe after the moulding carries out hole enlargement to the steel pipe total length after welding and non-destructive test(ing)(NDT), with the dimensional precision of further raising steel pipe, and improves steel pipe internal stress distribution.Be noted that especially the pipe expanding amount should be controlled in 0.8%, farthest reduces the prestrain amount in the tubulation process.
(7) steel pipe of tubulation after qualified carries out anticorrosion application temperature and should be controlled in 200 ℃, reduces strain aging to greatest extent and steel tube performance is produced has a strong impact on.
Key problem in technology of the present invention is to guarantee recently that through the set of dispense of microalloy elements such as Mn, Nb, Mo, Cu, Cr, Ti pipe line steel has sufficiently high intensity; Roll the abundant refine austenite recrystal grain of ratio in length and breadth through strengthening austenite recrystallization district's total deformation and properly distributed, improve inner second phase precipitate of steel plate and inclusion distribution; Deflection through reasonable control austenite non-recrystallization district; Make austenite crystal refine to suitable dimension, can not pursue too small crystal grain, cooperate the technology for controlled cooling of air cooling+water-cooled+air cooling; Generation grain-size size is suitable proeutectoid ferrite of the ratio of 2～8 μ m and MA or granular bainite or three's polyphase structure; And utilize the preheating after the water-cooled to realize self-tempering, and carbon atom and the conscientious optimization of dislocation are arranged, further improve the plasticity and the toughness of steel; Through little step-length repeatedly punching press and 0.8% guarantee the dimensional precision of steel pipe moulding with interior little hole enlargement amount; Reduce cause in the tubulation process and dependent variable; Cooperate lower application temperature; Reduce the influence of strain aging to greatest extent, produce the X70/X80 large-deformation-resistance pipeline steel pipe of excellent property steel tube performance.
The invention effect
The present invention has done optimization design at aspects such as alloy formula, controlled rolling air cooling technology and tube-making processes, need not existing metallurgical equipment, and steel rolling equipment, cooling apparatus and tubulation apparatus upgrade, and also do not need newly to add optional equipment, can directly carry out suitability for industrialized production.
Employing the present invention can produce the X70 of caliber 711mm～1422mm, wall thickness 10mm～33mm and the X80 Chinese People's Anti-Japanese Military and Political College is out of shape longitudinal submerged arc welded pipe and tubulation is used steel plate; Chinese People's Anti-Japanese Military and Political College's distortion steel pipe of being produced has good obdurability; Have good vertical viscous deformation capacity performance index after the coating, its each item index all is superior to the requirement of " the straight-line joint submerged arc welding tube additional requirements that transfering natural gas from the west to the east two wires natural gas pipeline projects are used based on strain design area ".Can satisfy earthquake zone of fracture, intracraton basin, tundra, landslide band etc. based on of the request for utilization of strain piping design area to this pipe line steel and steel pipe.
X70 and X80 large-deformation-resistance pipeline steel that the present invention produces have proeutectoid ferrite+MA or granular bainite duplex structure, or the polyphase structure of proeutectoid ferrite+MA+ granular bainite.After the insulation 5min timeliness, steel pipe body lateral performance can reach following index: 555MPa≤R under 200 ℃ ± 5 ℃ temperature of X80 large-deformation-resistance pipeline steel pipe
T0.5≤690MPa, 625MPa≤R
m≤825MPa, R
T0.5/ R
m≤0.93, elongation＞19% ,-10 ℃ summer reaches 200-350J than impacting toughness, and 0 ℃ DWTT shear area reaches 85%～100%; Vertically performance can reach following index: 530MPa≤R
T0.5≤650MPa, 625MPa≤R
m≤770MPa, R
T0.5/ R
m≤0.86, elongation＞40%, homogeneous deformation unit elongation UEL>=7.0%, R
T1.5/ R
T0.5>=1.070, R
T2.0/ R
T1.0>=1.033.Wherein the vertical, horizontal stress-strain curve is " dome-type " (Round house).After the insulation 5min timeliness, steel pipe body lateral performance can reach following index: 485MPa≤R under 200 ℃ ± 5 ℃ temperature of X70 large-deformation-resistance pipeline steel pipe
T0.5≤630MPa, 570MPa≤R
m≤760MPa, R
T0.5/ R
m≤0.90, elongation＞35% ,-10 ℃ summer reaches 230-380J than impacting toughness, and 0 ℃ DWTT shear area reaches 85%～100%; Vertically performance can reach following index: 450MPa≤R
T0.5≤600MPa, 570MPa≤R
m≤740MPa, R
T0.5/ R
m≤0.84, elongation>=45%, homogeneous deformation unit elongation UEL>=9.0%, R
T1.5/ R
T0.5>=1.09, R
T2.0/ R
T1.0>=1.05.Wherein vertical, horizontal stress-
Strain curve is " dome-type " (Round house).
Embodiment
Embodiment 1
Selecting thickness for use is the continuously cast bloom of 260mm, and at 1220 ℃ of insulation 100min, its chemical component weight per-cent is: C:0.060%, Mn:1.58%, Si:0.26%; S:0.0018%, P:0.012%, Nb:0.037%, Ti:0.024%, V:0.029%; Mo:0.18%, Cu:0.13%, Ni:0.16%, Cr:0.024%, constraint element B:0.00040%; Ca:0.005%, N :≤0.0065%, O:0.0018%, all the other are iron and inevitable impurity.
Continuously cast bloom carries out two stage rolling behind dephosphorize by high pressure water.The rolling start rolling temperature in austenite recrystallization district is 1180 ℃, transverse rolling total deformation 38%, axial rolling deflection 50%, 1050 ℃ of austenite recrystallization district finishing temperatures, intermediate blank thickness 80mm.
The intermediate blank air cooling treats that temperature is rolling to 900 ℃ of beginning austenite non-recrystallization districts, and the control compression ratio is 3.81, reaches final product thickness 21mm, and finishing temperature is controlled at 810 ℃.Controlling the rolling total deformation of last 3 passages is 21%, and removes the surface of steel plate iron scale without frame water in the operation of rolling.
Finish to gauge finishes back steel plate air cooling to 750 ℃, gets into laminar flow cooling line at once, and with the speed water-cooled to 470 of 23 ℃/s ℃, air cooling obtains the X70 Chinese People's Anti-Japanese Military and Political College deformed steel flat of 70% proeutectoid ferrite+30% granular bainite duplex structure at last to room temperature then.
Steel plate behind the finished edge, utilizes preparatory joggling machine to carry out crimp through milling the limit; According to the caliber size requirement, make edges of boards have satisfactory curvature, on the JCO shaper, carry out 27 stepping impact briquettings then; Improve steel pipe sizes precision in the moulding process, form " O " type of opening.Steel pipe after the moulding carries out hole enlargement to the steel pipe total length after welding and non-destructive test(ing)(NDT), the hole enlargement amount is 0.8%.Last 200 ℃ are carried out anticorrosion coating.Finally processing caliber is 1016mm, and wall thickness is the X70 Chinese People's Anti-Japanese Military and Political College distortion steel pipe of 21mm.
After the insulation 5min timeliness, steel pipe body lateral performance is following: R under 200 ℃ ± 5 ℃ temperature of this X70 large-deformation-resistance pipeline steel pipe
T0.5=539MPa, R
m=625MPa, R
T0.5/ R
m=0.86, elongation=41% ,-10 ℃ summer is 323J than impacting toughness, 0 ℃ DWTT shear area is 100%; Vertically performance is following: R
T0.5=466MPa, R
m=606MPa, R
T0.5/ R
m=0.77, elongation=43%, homogeneous deformation unit elongation UEL=11.0%, R
T1.5/ R
T0.5=1.136, R
T2.0/ R
T1.0=1.075.Wherein the vertical, horizontal stress-strain curve is " dome-type ".
Embodiment 2
Selecting thickness for use is the continuously cast bloom of 260mm, and at 1200 ℃ of insulation 120min, its chemical component weight per-cent is: C:0.075%, Mn:1.78%, Si:0.20%; S:0.0019%, P:0.010%, Nb:0.048%, Ti:0.016%; V:0.029%, MNi:0.21%, Cr:0.20%, constraint element B:0.00025%; Ca:0.006%, N :≤0.0055%, O:0.0015%, all the other are iron and inevitable impurity.
Continuously cast bloom carries out two stage rolling behind dephosphorize by high pressure water.The rolling start rolling temperature in austenite recrystallization district is 1170 ℃, transverse rolling total deformation 28%, axial rolling deflection 60%, 1040 ℃ of austenite recrystallization district finishing temperatures, intermediate blank thickness 85mm.
The intermediate blank air cooling treats that temperature is rolling to 910 ℃ of beginning austenite non-recrystallization districts, and the control compression ratio is 3.86, reaches final product thickness 22mm, and finishing temperature is controlled at 810 ℃.Controlling the rolling total deformation of last 3 passages is 20%, and removes the surface of steel plate iron scale without frame water in the operation of rolling.
Finish to gauge finishes back steel plate air cooling to 770 ℃, gets into laminar flow cooling line at once, and with the speed water-cooled to 430 of 25 ℃/s ℃, air cooling obtains the X80 Chinese People's Anti-Japanese Military and Political College deformed steel flat of 47% proeutectoid ferrite+53% granular bainite duplex structure at last to room temperature then.
Steel plate behind the finished edge, utilizes preparatory joggling machine to carry out crimp through milling the limit; According to the caliber size requirement, make edges of boards have satisfactory curvature, on the JCO shaper, carry out 29 stepping impact briquettings then; Improve steel pipe sizes precision in the moulding process, form " O " type of opening.Steel pipe after the moulding carries out hole enlargement to the steel pipe total length after welding and non-destructive test(ing)(NDT), the hole enlargement amount is 0.8%.Last 200 ℃ are carried out anticorrosion coating.Finally processing caliber is 1219mm, and wall thickness is the X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe of 22mm.
After the insulation 5min timeliness, steel pipe body lateral performance is following: R under 200 ℃ ± 5 ℃ temperature of this X80 large-deformation-resistance pipeline steel pipe
T0.5=615MPa, R
m=690MPa, R
T0.5/ R
m=0.89, elongation=24% ,-10 ℃ summer is 285J than impacting toughness, 0 ℃ DWTT shear area is 100%; Vertically performance is following: R
T0.5=560MPa, R
m=670MPa, R
T0.5/ R
m=0.84, elongation=41%, homogeneous deformation unit elongation UEL=9.0%, R
T1.5/ R
T0.5=1.116, R
T2.0/ R
T1.0=1.055.Wherein the vertical, horizontal stress-strain curve is " dome-type ".
Embodiment 3
Selecting thickness for use is the continuously cast bloom of 240mm, and at 1200 ℃ of insulation 120min, its chemical component weight per-cent is: C:0.065%, Mn:1.82%, Si:0.25%; S:0.0016%, P:0.008%, Nb:0.056%, Ti:0.018%, V:0.022%; Mo:0.25%, Cu:0.24%, Ni:0.21%, Cr:0.18%, constraint element B:0.00035%; Ca:0.007%, N :≤0.006%, O:0.0018%, all the other are iron and inevitable impurity.
Continuously cast bloom carries out two stage rolling behind dephosphorize by high pressure water.The rolling start rolling temperature in austenite recrystallization district is 1180 ℃, transverse rolling total deformation 35%, axial rolling total deformation 50%, 1030 ℃ of austenite recrystallization district finishing temperatures, intermediate blank thickness 85mm.
The intermediate blank air cooling treats that temperature is rolling to 920 ℃ of beginning austenite non-recrystallization districts, and the control compression ratio is 3.86, reaches final product thickness 22mm, and finishing temperature is controlled at 800 ℃.Controlling the rolling total deformation of last 3 passages is 23%, and removes the surface of steel plate iron scale without frame water in the operation of rolling.
Finish to gauge finishes back steel plate air cooling to 780 ℃, gets into laminar flow cooling line at once, and with the speed water-cooled to 410 of 25 ℃/s ℃, air cooling obtains the X80 Chinese People's Anti-Japanese Military and Political College deformed steel flat of proeutectoid ferrite+MA+ granular bainite heterogeneous structure at last to room temperature then.
Steel plate behind the finished edge, utilizes preparatory joggling machine to carry out crimp through milling the limit; According to the caliber size requirement, make edges of boards have satisfactory curvature, on the JCO shaper, carry out 29 stepping impact briquettings then; Improve steel pipe sizes precision in the moulding process, form " O " type of opening.Steel pipe after the moulding carries out hole enlargement to the steel pipe total length after welding and non-destructive test(ing)(NDT), the hole enlargement amount is 0.8%.Last 200 ℃ are carried out anticorrosion coating.Finally processing caliber is 1219mm, and wall thickness is the X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe of 22mm.
After the insulation 5min timeliness, steel pipe body lateral performance is following: R under 200 ℃ ± 5 ℃ temperature of this X80 large-deformation-resistance pipeline steel pipe
T0.5=645MPa, R
m=735MPa, R
T0.5/ R
m=0.88, elongation=23% ,-10 ℃ summer is 265J than impacting toughness, 0 ℃ DWTT shear area is 100%; Vertically performance is following: R
T0.5=590MPa, R
m=720MPa, R
T0.5/ R
m=0.82, elongation=43%, homogeneous deformation unit elongation UEL=8.0%, R
T1.5/ R
T0.5=1.121, R
T2.0/ R
T1.0=1.058.Wherein the vertical, horizontal stress-strain curve is " dome-type ".
Claims (1)
1. the X70 or X80 Chinese People's Anti-Japanese Military and Political College distortion steel pipe's production method, the X70 transverse yield strength is that 485～635Mpa, X80 transverse yield strength are 555～705MPa, it is characterized in that:
(1) moity is by weight percentage: C:0.035～0.08%, Mn:1.55～1.90%, Si:0.15～0.3%, S :≤0.0030%; P :≤0.015%, Nb:0.025～0.070%, Ti:0.015～0.035%, V:0.02～0.050%; Mo:0.10～0.30%, Cu:0.10～0.30%, Ni:0.15～0.35%; Cr:0～0.30%, constraint element B :≤0.00050%, Ca :≤0.009%; N :≤0.008%, O :≤0.002%, all the other are iron and inevitable impurity; Wherein X70 Chinese People's Anti-Japanese Military and Political College deformed steel flat alloying element content get its component near lower range, X80 Chinese People's Anti-Japanese Military and Political College deformed steel flat alloying element content get its component near upper range;
(2) continuous blank heating temperature is controlled at 1150～1230 ℃, and soaking time 1.5～2.5h carries out hot rolling then in two stages; Fs, the austenite recrystallization district was rolling; Start rolling temperature is controlled at 1160～1190 ℃, and finishing temperature is controlled at 980～1050 ℃, need carry out transverse rolling and axial rolling in this stage rolling; Wherein the transverse rolling total deformation be controlled at >=25%, the axial rolling total deformation should >=45%; Subordinate phase austenite non-recrystallization district is rolling; Start rolling temperature is 880～920 ℃; Finishing temperature should be 790～830 ℃, and this stage rolling compression ratio is controlled in 5 times, and not handy frame water removes the surface of steel plate iron scale in rolling last 3～5 passage operations of rolling;
(3) after the rolling completion, steel plate carries out air cooling, should control entry for the X80 large-deformation-resistance pipeline steel before temperature at 750～790 ℃, guarantee that 45～75% austenitic transformation is a proeutectoid ferrite body tissue; Temperature guarantees that at 740～780 ℃ 55～80% austenitic transformation is a proeutectoid ferrite body tissue before should controlling entry for the X70 large-deformation-resistance pipeline steel;
(4) steel plate behind the air cooling is carried out the laminar flow cooling; Speed of cooling is controlled at 15～25 ℃/s; Final cooling temperature is controlled at 350～530 ℃; Change remaining austenite into MA or its mixed structure of granular bainite, carry out air cooling then, finally obtain proeutectoid ferrite+MA/ granular bainite heterogeneous structure or proeutectoid ferrite+MA+ granular bainite polyphase structure;
(5) on the JCO shaper, carry out repeatedly stepping punching press, be pressed into " J " shape, with second half bending equally of steel plate, be pressed into " C " shape again, form " O " type of opening at last; For the steel plate of the following thickness of 22mm, the punching press number of times is at >=25 times; The steel plate of the above thickness of 22mm, the punching press number of times is at >=39 times;
(6) the steel pipe total length is carried out hole enlargement, the pipe expanding amount should be controlled in 0.8%;
(7) anticorrosion application temperature should be controlled in 200 ℃;
(8) steel pipe is incubated 5min under 200 ℃ ± 5 ℃ temperature.
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| CN110475887A (en) * | 2017-04-04 | 2019-11-19 | 日本制铁株式会社 | Longitudinal seam welding steel pipe |
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