CN105177453B - A kind of high-strength high-performance is continuously managed and its manufacture method - Google Patents
A kind of high-strength high-performance is continuously managed and its manufacture method Download PDFInfo
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- CN105177453B CN105177453B CN201510617359.8A CN201510617359A CN105177453B CN 105177453 B CN105177453 B CN 105177453B CN 201510617359 A CN201510617359 A CN 201510617359A CN 105177453 B CN105177453 B CN 105177453B
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Abstract
Continuously managed and its manufacture method the invention discloses a kind of high-strength high-performance, in accordance with the following steps：(1) molten iron is combined blow converter and aod, ladle refining and external refining, and pour into continuous casting billet as main material by pushing up bottom；Strand is cast into slab, more than 500 meters roll bendings of length are eventually fabricated；(2) roll bending slitting and docking；(3) manufacture vertical masonry joint superhigh intensity is continuously managed；(4) high frequency welding line and full body are needed to be heat-treated respectively.The continuous pipe manufacturing method of superhigh intensity of the present invention, the continuous 965MPa of pipe yield strength 689 of manufacture, the 1034MPa hardness of tensile strength 758≤28HRC.With the characteristic that intensity is high, moment of torsion is high, resistance to compression is high, the life-span is high, it is adapted to apply in deep-well, ultradeep well, while being appropriate for operations involving high pressure.In horizontal fractures operation, pressure break number of plies can be with up to ten multilayers, and operating efficiency is high, can effectively improve oil gas well yield.
Description
Technical field：
The invention belongs to petroleum gas tubing technical field, it is related to a kind of with property such as high torque, high resistance to compression, high life
The continuous pipe manufacturing method of superhigh intensity of energy, especially a kind of high-strength high-performance is continuously managed and its manufacture method.
Background technology：
Continuous pipe (CT, Coiled tubing), is a kind of high intensity, high-ductility and the list with certain corrosion resistance
Root length is up to thousands of meters of Novel oil gas tubing.Because continuous Manifold technology has, efficiency high, cost are low, job area is wide, account for
A series of technological merits and the operation advantage such as ground area is small, therefore continuous pipe will be in exploration of oil and gas field, exploitation, operation, volume increase
More and more important effect is played, is had broad application prospects.
At present, the increasing number developed with unconventional petroleum resources is increased along with China's oil-gas exploration and development difficulty, is permitted
Many complex hydrocarbon well engineering roadblocks will be apparent from.Such as Tarim Basin, its Oil/gas Well collect ultra-deep, super-pressure, superhigh temperature in
One, intensity to continuous pipe, the requirement for resisting the combination property such as burst are further improved.And Deep Oil And Gas Exploration resource is surveyed
It is that the performance of enterprises improves in each oil company and competitiveness reaches stable yields, the key of volume increase to visit exploitation.With 50.8 × 4.44mm company
Exemplified by continuous pipe, in the case where yield strength is less than 689MPa (100000psi), payload security coefficient 0.8, its single continuous pipe
Maximum length is 7098m, and depth of falling well is also without departing from this length.Conventional continuous pipe low strength, it is impossible to adapt to above-mentioned deep-well,
Ultradeep well and high pressure well operations.Continuously pipe relies on higher intensity to superhigh intensity, and the maximum load that can be born is also higher, Ke Yiman
Use of the foot in deep-well, ultradeep well, operation is with the obvious advantage in deep-well, ultradeep well.So in face of deep in exploitation of oil-gas field
Well, ultradeep well quantity are continuously increased, it is necessary to the continuous pipe of a large amount of high intensity.
Meanwhile, in order to improve production efficiency, horizontal well is largely used both at home and abroad.The continuous pipe of superhigh intensity connects than regular tenacity
Continuous pipe has a clear superiority in horizontal well acid fracturing operation：Superhigh intensity continuously manages anti-internal pressure height, and Anti -collapse pressure is big, is adapted to
Carry out operations involving high pressure.Because continuous pipe intensity is high, the number of plies of a lower tubular column successively pressure break is more, can with up to more than ten substratum,
Operating efficiency is high, can effectively improve oil gas well yield.So application has the advantages such as intensity height, moment of torsion height, fatigue life height
The continuous pipe of superhigh intensity carries out the fracturing work of horizontal well, and being substantially improved for operating efficiency can be achieved.
In addition, continuous pipe needs to be plastically deformed repeatedly in operation, fatigue life is its main performance index, superhigh intensity
Continuous pipe is by advantages such as intensity height, moment of torsion height, resistance to compression height, and its low-cycle fatigue service life is continuously managed far above low-intensity.
The content of the invention：
It is an object of the invention to overcome the shortcoming of above-mentioned prior art there is provided one kind to have high torque, high resistance to compression, longevity
The continuous pipe manufacturing method of superhigh intensity of the performances such as life.Designed by reasonable alloy, using technique systems such as refining, control bundle, pickling
It is standby go out connecting pipes roll bending.The continuous pipe roll bending after slitting is connected using special sheet material docking technique, using row-roll forming process
And high frequency induction welding (HFW) technology carries out tubulation, and superhigh intensity is produced by follow-up heat treatment continuously managed.
The purpose of the present invention is solved by the following technical programs：
A kind of high-strength high-performance is continuously managed, yield strength 689-965MPa, the tensile strength 758- of the continuous pipe
1034MPa, elongation percentage >=13%, external diametrical extent are that Φ 25.4- Φ 88.9mm, wall thickness range are 2.4-6.35mm, length range
For 1000-10000m, hardness≤28HRC.
According to mass percent, the chemical composition of the continuous pipe is as follows：C 0.12-0.16%, Mn 0.7-2.0%, P
≤ 0.002%, S≤0.003%, Si 0.4-0.45%, Cr 1.0-1.5%, Ni 0.36-0.8%, Cu 0.26-0.4%,
Mo 0.45-0.5%, Al 0.04-0.05%, Ti 0.03-0.05%, V 0.05-0.08%, more than Nb 0.02-0.06%, Fe
Amount.
The manufacture method of the continuous pipe, in accordance with the following steps：
(1) molten iron is combined blow converter and aod, ladle refining and external refining as main material by pushing up bottom,
And pour into continuous casting billet；Strand is cast into slab, more than 500 meters roll bendings of length are eventually fabricated；
(2) roll bending slitting and docking；
(3) manufacture vertical masonry joint superhigh intensity is continuously managed；
(4) high frequency welding line and full body are needed to be heat-treated respectively.
The step (1) is：By slab heating temperature to 1050-1250 DEG C, using continuous casting technology application electromagnetic agitation control
System casts the slab of 20-60mm thickness, finishing temperature：820-880 DEG C, the hot rolled plate of 2.4-6.35mm thickness is rolled into, is rolled up
Qu Wendu 500-600 DEG C, are eventually fabricated more than 500 meters roll bendings of length.
The step (2) is：By the superhigh intensity roll bending prepared according to continuous pipe specification requirement, cut by slitting line
Into 80-300mm steel band；, need to be by steel band spreading to meet continuous length of tube requirement；Steel band spreading is docked using 45 ° of inclined welds
Method；Docking when, by the end machining of front and rear two steel bands it is at 45 ° after, reasonable finished edge, groove be I types, V-type or U
Type, is welded using plasma landfilling area or argon arc welding method, after weld seam is cooled down, trimming surface, then by weld seam
And heat affected area is reheated to more than AC3 temperature, 10-30s is incubated, using 5-9 tons of pressure, weld dimensions are entered
Weld dimensions natural cooling after row high temperature rolling, rolling；Chilling temperature is less than after 150 DEG C, by weld dimensions
600-800 DEG C is reheated to be annealed.
The step (2) is：According to the external diameter of final continuous pipe and wall thickness requirement, using the method on milling side by strip side
I types, V-type or X-type groove are dug into, accurate control strip width and edges of boards perpendicularity control steel band using UOE row-roll forming processes method
Shaping；Using high frequency induction welding connection technology, accurate control angular aperture and amount of compression and welding parameter are indulged the steel band of shaping
To welding, it is ensured that welding quality；The amount of compression of weld seam is controlled in 1.0-2.5mm, angular aperture θ controls are at 4-8 °, and speed of welding is
15-25m/min；Caliber is welded into for Φ 25.4- Φ 88.9mm, wall thickness is continuously managed for 2.4-6.35mm vertical masonry joint superhigh intensity.
The step (2) is：After the completion of welding, weld seam is locally heated to more than AC3, and using compression roller to its tubing
Apply certain deformation quantity to weld seam by the way of sizing, then it is quenched；After having quenched, using intermediate frequency or other are fast
Fast mode of heating, homogeneous tube is heated to after two-phase section, heat penetration to control it cooling, elimination weld seam is bad to eliminate tissue, reduction firmly
Degree, improves overall performance；Weld seam heat treatment temperature is：850-960 DEG C, full 600-850 DEG C of body heat treatment temperature.
A kind of superhigh intensity of the present invention (yield strength 689-965MPa, tensile strength 758-1034MPa hardness≤
28HRC.) continuously manage and manufacture method.The technical scheme of use is：
(1) the continuous tube sheet material design of superhigh intensity：Sheet material design uses low-carbon micro steel-alloy design system, according to followingization
Composition by weight percent is learned to smelt, be cast into slab：According to mass percent, the chemical composition of the continuous pipe is as follows：C
0.12-0.16%, Mn 0.7-2.0%, P≤0.002%, S≤0.003%, Si 0.4-0.45%, Cr 1.0-1.5%, Ni
0.36-0.8%, Cu 0.26-0.4%, Mo 0.45-0.5%, Al 0.04-0.05%, Ti 0.03-0.05%, V 0.05-
0.08%th, Nb 0.02-0.06%, Fe surpluses.
Using molten iron as main material, it is combined by pushing up bottom outside blow converter and aod (AOD) and ladle refining and stove
Refining, the composition quality percentage of molten steel reaches that above-mentioned requirements can tap, pours into continuous casting billet.Slab heating temperature is arrived
1050-1250 DEG C, control to cast the slab of 20-60mm thickness, finishing temperature using continuous casting technology application electromagnetic agitation：820-
880 DEG C, rolled into the hot rolled plate of 2.4-6.35mm thickness, 500-600 DEG C of coiling temperature, be eventually fabricated length more than 500 meters,
Thickness meets the coiled material of application requirement, wherein, thickness can be with the regular change of length.
(2) roll bending slitting and docking：By the superhigh intensity roll bending prepared according to continuous pipe specification requirement, pass through slitter
Group is cut into 80-300mm steel band., need to be by steel band spreading to meet continuous length of tube requirement.Steel band spreading is using 45 ° of inclined welds pair
The method connect.Docking when, by the end machining of front and rear two steel bands it is at 45 ° after, reasonable finished edge (I types, V-type or U-shaped),
Welded using plasma landfilling area or argon arc welding method, required welding wire is the welding wire specially developed.After weld seam is cooled down, clearly
Face of weld is managed, then weld dimensions are reheated to more than AC3 temperature, 10-30s is incubated, using 5-9 tons of pressure
Weld dimensions are carried out weld dimensions natural cooling after high temperature rolling, rolling by power.Chilling temperature is less than 150
After DEG C, weld dimensions are reheated 600-800 DEG C and annealed
(3) according to the external diameter of final continuous pipe and wall thickness requirement, using milling side method by steel side dig into I types, V-type or
X-type groove, accurate control strip width and edges of boards perpendicularity, steel belt molding is controlled using UOE row-roll forming processes method.Utilize high frequency
Induction welding technology, accurate control angular aperture and amount of compression and welding parameter, carry out longitudinal measure, it is ensured that weldering to the steel band of shaping
Connect quality.The amount of compression of weld seam is controlled to be controlled in 1.0-2.5mm, angular aperture θ at 4-8 °, speed of welding is 15-25m/min.Weldering
Caliber is connected into for Φ 25.4- Φ 88.9mm, wall thickness is continuously managed for 2.4-6.35mm vertical masonry joint superhigh intensity.
(4) in order to ensure the integral hardness of continuous pipe, high frequency welding line and full body are needed to be heat-treated respectively.For
Improvement weldquality, after the completion of welding, more than AC3 is locally heated to by weld seam, and using compression roller to its tubing using fixed
The mode in footpath applies certain deformation quantity to weld seam, and then it is quenched；After having quenched, using intermediate frequency or other quick heating
Mode, homogeneous tube is heated to after two-phase section, heat penetration to control it cooling, so that reaching that elimination weld seam is bad eliminates tissue, reduction
Hardness, improves the purpose of overall performance.Weld seam heat treatment temperature is：850-960 DEG C, full 600-850 DEG C of body heat treatment temperature.
The beneficial effects of the present invention are：The continuous pipe manufacturing method of superhigh intensity of the present invention, the continuous pipe surrender of manufacture
Intensity 689-965MPa, tensile strength 758-1034MPa hardness≤28HRC.With intensity is high, moment of torsion is high, resistance to compression is high, the life-span is high
Characteristic, be adapted to apply in deep-well, ultradeep well, while being appropriate for operations involving high pressure.Pressure break in horizontal fractures operation
The number of plies can be with up to ten multilayers, and operating efficiency is high, can effectively improve oil gas well yield.
Embodiment：
The present invention is described in further detail below：
According to the requirement of above-mentioned roll bending chemical composition, the continuous pipe roll bending of two kinds of chemical compositions, a constituent element quality amount hundred are equipped with
Fraction is high, and constituent element element mass percent is low, and the continuous pipe manufacture of superhigh intensity is carried out respectively.
What two kinds of embodiments were manufactured is all that superhigh intensity is continuously managed.
The main manufacturing steps of the high roll bending manufacture continuous pipe of superhigh intensity of element mass fraction are as follows：
First, the continuous pipe roll bending of superhigh intensity is prepared
Using molten iron as main material, blow converter and aod (AOD) and ladle refining furnace refining are combined by pushing up bottom,
The composition quality percentage of molten steel reaches that following requirements can tap, and pours into continuous casting billet.
According to mass percent, the chemical composition of the continuous pipe is as follows：C 0.15%, Mn 1.5%, P≤0.002%,
S≤0.003%, Si 0.45%, Cr1.4%, Ni 0.7%, Cu 0.32%, Mo 0.48%, Al 0.05%, Ti0.04%,
V 0.07%, Nb 0.05%, Fe surpluses.
Control to cast the slab of 20-60mm thickness using continuous casting technology application electromagnetic agitation, be reheated to about 1100 DEG C,
Hot strip mill is used by thermomechanically controlling technique (TMPC) to roll into the hot rolled plate that thickness is 1180mm for 4.44mm, width,
Cooled down again by appropriate control, form the continuous pipe roll bending of superhigh intensity, eventually passed after pickling, detection, through tension force crimping machine
Roll bending is curled into use for tubulation.
2nd, the continuous control of superhigh intensity is standby
1st, roll bending slitting and steel band spreading
The continuous pipe roll bending prepared is cut into 157mm steel band by slitting line.To meet continuous length of tube requirement,
Steel band is entered into andante plate butt welding, steel band is connected by 45 ° of inclined weld modes.By the end machining of front and rear two steel bands into
45 °, welded by the way of plasma is welded, welding overall process uses the nitrogen of purity >=99.7% as protective gas,
Enter andante plate butt welding under continuous gas protection；Weld seam is subjected to heating and rolling processing after welding cutting edge of a knife or a sword cooling, rapidly weld seam is heated
To 750 DEG C, 20s is incubated, weld seam is extruded with roll, squeeze pressure is about 7 tons.It is small that weld seam after rolling is cooled to temperature
In after 150 DEG C, weld seam is reheated 700 DEG C, natural cooling in air.
2nd, the shaping and welding of continuous pipe
Steel band edges of boards use milling side method by edge milling for V-type, accurate control strip width and edges of boards perpendicularity；Using
UOE row-roll forming processes method controls steel belt molding；Continuous pipe pipe, weldering speed 18m/min, frequency are welded using high-frequency welding technology
380KHz, power 170Kw, amount of compression are controlled at 6 ° in 1.5mm, angular aperture θ.Caliber is welded into for Φ 50.8mm, wall thickness is
4.44mm vertical masonry joint electric-resistance-welded steel pipe.
3rd, weld seam is heat-treated
Postwelding is struck off to burr outside tube wall, and by Intermediate Frequency Induction Heating Equipment, weld seam is heated rapidly into 940 DEG C,
It is 25 DEG C then to control water cooling temperature, makes about 450 DEG C of progress water coolings of weld seam temperature, has obtained preferable Weld Performance.
4th, full body heat treatment
In order to eliminate residual stress after tubulation, body mother metal produces good structure property, will utilize medium-frequency heating system
760 DEG C are heated to continuously managing full body, then carries out water cooling.
5th, the continuous crisping of the continuous pipe of superhigh intensity
On the reel that appropriate core diameter is wound into by coiling machine, continuous system is continuously managed for 3500m superhigh intensitys, so as to
Transport and use.
6th, the main performance of the continuous pipe of superhigh intensity
Yield strength is 905MPa, and tensile strength is 985MPa, and elongation percentage reaches 20%, and hardness is less than 28HV.
The main manufacturing steps of the low roll bending manufacture continuous pipe of superhigh intensity of element mass fraction are as follows：
First, the continuous pipe roll bending of superhigh intensity is prepared
Using molten iron as main material, blow converter and aod (AOD) and ladle refining furnace refining are combined by pushing up bottom,
The composition quality percentage of molten steel reaches that following requirements can tap, and pours into continuous casting billet.
According to mass percent, the chemical composition of the continuous pipe is as follows：C 0.12%, Mn 0.8%, P≤
0.0015%th, S≤0.003%, Si 0.4%, Cr 1.1%, Ni 0.4%, Cu 0.28%, Mo 0.45%, Al 0.04%,
Ti 0.04%, V 0.06%, Nb 0.03%, Fe surpluses.
Control to cast the slab of 20-60mm thickness using continuous casting technology application electromagnetic agitation, be reheated to about 1100 DEG C,
Hot strip mill is used by thermomechanically controlling technique (TMPC) to roll into the hot rolled plate that thickness is 1180mm for 4.44mm, width,
Cooled down again by appropriate control, form the continuous pipe roll bending of superhigh intensity, eventually passed after pickling, detection, through tension force crimping machine
Roll bending is curled into use for tubulation.
2nd, the continuous control of superhigh intensity is standby
1st, roll bending slitting and steel band spreading
The continuous pipe roll bending prepared is cut into 157mm steel band by slitting line.To meet continuous length of tube requirement,
Steel band is entered into andante plate butt welding, steel band is connected by 45 ° of inclined weld modes.By the end machining of front and rear two steel bands into
45 °, welded by the way of plasma is welded, welding overall process uses the nitrogen of purity >=99.7% as protective gas,
Enter andante plate butt welding under continuous gas protection；Weld seam is subjected to heating and rolling processing after welding cutting edge of a knife or a sword cooling, rapidly weld seam is heated
To 725 DEG C, 20s is incubated, weld seam is extruded with roll, squeeze pressure is about 7 tons.It is small that weld seam after rolling is cooled to temperature
In after 150 DEG C, weld seam is reheated 700 DEG C, natural cooling in air.
2nd, the shaping and welding of continuous pipe
Steel band edges of boards use milling side method by edge milling for V-type, accurate control strip width and edges of boards perpendicularity；Using
UOE row-roll forming processes method controls steel belt molding；Continuous pipe pipe, weldering speed 18m/min, frequency are welded using high-frequency welding technology
380KHz, power 170Kw, amount of compression are controlled at 6 ° in 1.5mm, angular aperture θ.Caliber is welded into for Φ 50.8mm, wall thickness is
4.44mm vertical masonry joint electric-resistance-welded steel pipe.
3rd, weld seam is heat-treated
Postwelding is struck off to burr outside tube wall, and by Intermediate Frequency Induction Heating Equipment, weld seam is heated rapidly into 925 DEG C,
It is 25 DEG C then to control water cooling temperature, makes about 450 DEG C of progress water coolings of weld seam temperature, has obtained preferable Weld Performance.
4th, full body heat treatment
In order to eliminate residual stress after tubulation, body mother metal produces good structure property, will utilize medium-frequency heating system
720 DEG C are heated to continuously managing full body, then carries out water cooling.
5th, the continuous crisping of the continuous pipe of superhigh intensity
On the reel that appropriate core diameter is wound into by coiling machine, continuous system is continuously managed for 3500m superhigh intensitys, so as to
Transport and use.
6th, the main performance of the continuous pipe of superhigh intensity
Yield strength is 725MPa, and tensile strength is 820MPa, and elongation percentage reaches 24%, and hardness is less than 28HV.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to assert
The embodiment of the present invention is only limitted to this, for general technical staff of the technical field of the invention, is not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, the present invention should be all considered as belonging to by institute
Claims of submission determine scope of patent protection.
Claims (2)
1. a kind of manufacture method of the continuous pipe of high-strength high-performance, it is characterised in that in accordance with the following steps：
(1) molten iron is combined blow converter and aod, ladle refining and external refining, and pour as main material by pushing up bottom
Form continuous casting billet；Strand is cast into slab, more than 500 meters roll bendings of length are eventually fabricated；By slab heating temperature to 1050-1250
DEG C, control to cast the slab of 20-60mm thickness, finishing temperature using continuous casting technology application electromagnetic agitation：820-880 DEG C, by it
The hot rolled plate of 2.4-6.35mm thickness is rolled into, 500-600 DEG C of coiling temperature is eventually fabricated more than 500 meters roll bendings of length
(2) roll bending slitting and docking；By the superhigh intensity roll bending prepared according to continuous pipe specification requirement, cut by slitting line
Into 80-300mm steel band；, need to be by steel band spreading to meet continuous length of tube requirement；Steel band spreading is docked using 45 ° of inclined welds
Method；Docking when, by the end machining of front and rear two steel bands it is at 45 ° after, reasonable finished edge, groove be I types, V-type or U
Type, is welded using plasma landfilling area or argon arc welding method, after weld seam is cooled down, trimming surface, then by weld seam
And heat affected area is reheated to more than AC3 temperature, 10-30s is incubated, using 5-9 tons of pressure, weld dimensions are entered
Weld dimensions natural cooling after row high temperature rolling, rolling；Chilling temperature is less than after 150 DEG C, by weld dimensions
600-800 DEG C is reheated to be annealed；
(3) manufacture vertical masonry joint superhigh intensity is continuously managed；Yield strength 689-965MPa, the tensile strength 758- of the continuous pipe
1034MPa, elongation percentage >=13%, external diametrical extent are that Φ 25.4- Φ 88.9mm, wall thickness range are 2.4-6.35mm, length range
For 1000-10000m, hardness≤28HRC；
(4) high frequency welding line and full body are needed to be heat-treated respectively；After the completion of welding, weld seam is locally heated to AC3
More than, and apply certain deformation quantity to weld seam by the way of compression roller uses sizing to its tubing, then it is quenched；
After having quenched, using intermediate frequency or other quick mode of heatings, homogeneous tube is heated to control it after two-phase section, heat penetration cold
But, elimination weld seam is bad eliminates tissue, reduction hardness, improves overall performance；Weld seam heat treatment temperature is：850-960 DEG C, full body heat
600-850 DEG C for the treatment of temperature；According to mass percent, the chemical composition of the continuous pipe is as follows：C 0.12-0.16%, Mn
0.7-2.0%, P≤0.002%, S≤0.003%, Si 0.4-0.45%, Cr 1.1-1.5%, Ni 0.36-0.8%, Cu
0.26-0.4%, Mo 0.45-0.5%, Al 0.04-0.05%, Ti 0.03-0.05%, V 0.05-0.08%, Nb 0.02-
0.06%th, Fe surpluses.
2. the manufacture method of continuous pipe as described in claim 1, it is characterised in that the step (2) is：According to final continuous
External diameter and the wall thickness requirement of pipe, dig into I types, V-type or X-type groove by strip side using the method on milling side, accurately control strip
Width and edges of boards perpendicularity, steel belt molding is controlled using UOE row-roll forming processes method；Using high frequency induction welding connection technology, accurate control
Angular aperture and amount of compression processed and welding parameter, carry out longitudinal measure, it is ensured that welding quality to the steel band of shaping；Control squeezing for weld seam
Pressure amount is controlled at 4-8 ° in 1.0-2.5mm, angular aperture θ, and speed of welding is 15-25m/min；Caliber is welded into for Φ 25.4- Φ
88.9mm, wall thickness is continuously managed for 2.4-6.35mm vertical masonry joint superhigh intensity.
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| CN104694835A (en) * | 2008-11-26 | 2015-06-10 | 新日铁住金株式会社 | Seamless steel pipe and method for manufacturing same |
| CN101898295A (en) * | 2010-08-12 | 2010-12-01 | 中国石油天然气集团公司 | Manufacturing method of high-strength and high-plasticity continuous tube |
| CN104046918A (en) * | 2013-03-14 | 2014-09-17 | 特纳瑞斯盘管有限公司 | High Performance Material For Coiled Tubing Applications And The Method Of Producing The Same |
| CN104328357A (en) * | 2014-10-28 | 2015-02-04 | 江阴兴澄特种钢铁有限公司 | Steel plate for Ni-Mo low-temperature high-ductility X100 pipe fittings and manufacturing method thereof |
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