CN101250671A - Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof - Google Patents
Petroleum casing pipe with high-strength and high ductility as well as manufacturing method thereof Download PDFInfo
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Abstract
The invention provides a steel grade of a bergol cannula with high intensity and high toughness, wherein the propositions of composition elements are that C 0.22-0.4%, Si 0.17-0.35%, Mn 0.45-0.60%, Cr 0.95-1.10%, Mo 0.70-0.80%, Al 0.015-0.040%, Ni<0.20%, Cu<0.20%, V 0.070-0.100%, Ca>0.0015%, P<0.010%, S<0.003% and the allowance is iron. The invention also provides a method for rolling the bergol cannula, which comprises the following steps: firstly, smelting batching, secondly, continuously casting and rolling, thirdly, processing a pipe. The method has the advantages of embodying steel grade with higher alloy content is adopted through the method, excellent mechanical property and lower production cost, the making of perforation and rolling techniques are reasonable, mechanical property of cannual is maximally improved, the selection of heat treatment process technique and thermal straightening temperature are reasonable, grain fineness numbers of tissues are refined, residual tension stress of the cannula is greatly lowered, geometric precision control range is strictly planned, and the property of the cannula is improved under the circumstance of reasonable production cost.
Description
Technical field
The invention belongs to the weldless steel tube manufacturing technology of metallurgical industry, particularly a kind of petroleum casing pipe and manufacture method thereof with high strength and high tenacity.
Background technology
Along with the height of oil price is risen development with exploration engineering, the reservoir depth of exploitation constantly from the superficial to the deep, pressure and temperature in the oil gas well also improves constantly, and it is more and more abominable that geologic media also becomes, and makes the stressed condition that petroleum casing pipe bore of oil gas down-hole more complicated and harsh.Such drilling condition is very harsh to the intensity and the toughness reguirements of petroleum casing pipe, in case the petroleum casing pipe selection is improper, accidents such as conquassation and leakage will occur, causes the underproduction of whole mouthful of well, even scraps.Simultaneously, under present production technology level, steel exist small shortcoming or damage to be difficult to avoid, and key is to improve its fracture toughness property when improving petroleum casing pipe intensity, make the shortcoming of material or damage unlikely expansion and cause breaking after carrying.
At present, the subject matter of restriction petroleum casing pipe mechanical property is in high strength and obdurability coupling.The strength and toughness of general steel shows as the relation of growth and decline each other, and usually toughness is just low for the high steel of intensity, otherwise, for pursuing high tenacity, just must sacrifice the intensity of steel.The technical difficult points that restriction has high strength and a high toughness petroleum casing pipe manufacturing has: steel Chemical Composition, high purity steel are smelted, rolling, the thermal treatment process of ultra-fine grain steel and method for aligning and sleeve pipe geometric accuracy difference etc.These problems have restricted the development with high-strong toughness petroleum casing pipe.Along with the further increasing of petroleum industry drilling difficulty, high-intensity high-tenacity telescopic demand strengthens, so be badly in need of the R﹠D and production performance reaches 150KSI far above the strength grade of API5CT standard Q125 grade of steel high tenacity sleeve pipe.
In a word, the mechanical property of high-strong toughness petroleum casing pipe is not only relevant, also closely related with its manufacture method with the material composition that adopts.Research high-strong toughness petroleum casing pipe and manufacturing technology thereof are the still afoot problems of present each weldless steel tube enterprise.
Summary of the invention
For solving the problem that exists in the above-mentioned technology, the purpose of this invention is to provide a kind of petroleum casing pipe and manufacture method thereof with high strength and high tenacity, satisfy the needs of oil field deep well or ultra deep well field conditions.Petroleum casing pipe by this method manufacturing can reach the V150 grade of steel.
For achieving the above object, technical solution of the present invention provides a kind of have high strength and high toughness petroleum casing pipe, the weight proportion of sleeve pipe steel grade component is: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
Rolling manufacture method with high strength and high toughness petroleum casing pipe, its step includes:
1. batching is smelted
By above-mentioned steel grade component weight item be: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
2. continuous casting and rolling
High purity steel water continuous casting becomes the circle base, and at the rotary heating furnace internal heating, furnace temperature is 1300～1320 ℃ with cooled continuously cast bloom, 1250～1240 ℃ of heat centering temperature, 1230～1220 ℃ of hot piercing temperature, 1100～1050 ℃ of tandem rolling temperature, 890～910 ℃ of sizing temperature, cooling, sawing.
3. pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 920 ℃ ± 10 ℃, and quenchant is a water, and tempering temperature adopts air cooling at 630 ℃ ± 10 ℃; After the petroleum casing pipe thermal treatment, need through row sizing and straightening processing, the sizing mill temperature is between 630～610 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～520 ℃ at last;
The index that the mechanical property of described petroleum casing pipe reaches is as follows:
Yield strength: 1034～1172MPa
Tensile strength: 〉=1120MPa
Impelling strength: vertical full-scale Charpy-V impact power (0 ℃) 〉=80J
Horizontal full-scale Charpy-V impact power (0 ℃) 〉=80J
Unit elongation: 〉=16%.
The invention has the beneficial effects as follows and use this processing method to be in particular in: 1) adopt the higher steel grade of alloy content, good mechanical property, cost is lower; What 2) perforation and rolling technology were formulated is reasonable, has improved the telescopic mechanical property to greatest extent; 3) thermal treatment process and hot straightening temperature are selected rationally, refinement the grain fineness number of tissue, reduced the telescopic unrelieved stress to greatest extent; 4) work out strict geometric accuracy span of control, under the rational situation of cost, improved the telescopic performance.Sleeve pipe of the present invention far exceeds the highest existing grade of steel requirement of API standard aspect mechanical performance index.
Embodiment
In conjunction with the embodiments petroleum casing pipe and the manufacture method thereof with high strength and high tenacity of the present invention is illustrated.
Of the present invention have high strength and a high toughness petroleum casing pipe, the weight proportion of sleeve pipe steel grade component is: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
Rolling manufacture method with high strength and high toughness petroleum casing pipe, its step includes:
1. batching is smelted
By above-mentioned steel grade component weight item be: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
2. continuous casting and rolling
High purity steel water continuous casting becomes the circle base, the pipe cross-sectional area amasss ratio less than 10: 1 with steel tube section, with cooled continuously cast bloom at the rotary heating furnace internal heating, furnace temperature is 1300～1320 ℃, 1250～1240 ℃ of heat centering temperature, 1230～1220 ℃ of hot piercing temperature, 1100～1050 ℃ of tandem rolling temperature, 890～910 ℃ of sizing temperature, cooling, sawing.
3. pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 920 ℃ ± 10 ℃, and quenchant is a water, and tempering temperature adopts air cooling at 630 ℃ ± 10 ℃.After the petroleum casing pipe thermal treatment, need through row sizing and straightening processing, the sizing mill temperature is between 630～610 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～520 ℃ at last.
The index that the mechanical property of described petroleum casing pipe reaches is as follows:
Yield strength: 1034～1172MPa
Tensile strength: 〉=1120MPa
Impelling strength: vertical full-scale Charpy-V impact power (0 ℃) 〉=80J
Horizontal full-scale Charpy-V impact power (0 ℃) 〉=80J
Unit elongation: 〉=16%.
Telescopic steel grade of the present invention is achieved in that
(1) batching is smelted
Adopt sponge iron and steel scrap to do steelmaking feed, (EFA) is fused into molten steel with electric arc furnace, through external refining (LF) and vacuum (VD) degas method, the content of impurity in the control steel, improve the purity of steel, the weight item that obtains petroleum casing pipe is: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
Introduce the content and the effect of each alloying element below respectively:
C:0.22～0.4%, C are carbide forming element, can improve the intensity of steel, DeGrain when too low, and too Gao Shihui reduces the toughness of steel greatly.
Si:0.17～0.35%, silicon improve the intensity and the anti-anti-oxidant and acid resistance of high temperature of sosoloid in the steel, but reduce the toughness and the plasticity of steel.
Mn:0.45～0.60%, Mn are austenite former, can improve the hardening capacity of steel, increase the remained austenite content in the steel, influence the homogeneity of hot rolling microstructure, and Mn can also form the manganese sulfide inclusion thing with S, influences material property.
Cr:0.95～1.10%, chromium can improve mechanical property, the erosion resistance of steel and improve hardening capacity, but it can make the temper brittleness of steel increase.
V:0.070～0.100% can crystal grain thinning, forms carbide, improves the intensity and the toughness of steel.But when content reached a certain amount of, its effect increase was just not obvious, simultaneously because price is very high, so want prohibitive amount.
Mo:0.70～0.80% mainly is the intensity that improves steel by carbide and solution strengthening form, and too high levels can reduce the toughness of steel.
Al:0.015～0.040%, aluminium can crystal grain thinnings, improve the antioxidant property of steel and to the erosion resistance of hydrogen sulfide, reduce the brittle transition temperature of steel.When the aluminium amount is too much,, reduce hot strength and toughness with promoting the greying tendency of steel.
Ni＜0.20, nickel improves the obdurability of steel, improves the resistance to corrosion of steel, reduces the brittle transition temperature of steel.
The intensity and the resistance to atmospheric corrosion of steel can be improved in Cu＜0.20, copper in steel alloy, add-on too much can make steel become fragile, and generally should not surpass 0.2%.
Ca＞0.0015%, calcium are good deoxidant element in steel-making, and it also has the inclusion modification ability, under the condition of the abundant deoxidation of molten steel, can form spherical complex inclusion with sulphur and aluminum oxide etc., reduce each diversity of steel, improve the material lateral performance.
S＜0.003, harmful element is easy to element formation inclusiones such as Mn in the steel, because the type inclusion is softer, presses the machine direction extensional easily in the operation of rolling, isolates the material body, causes material discontinuous, strengthens anisotropy of material.Therefore the content of sulphur needs strict control in High Strength Steel.
(2) continuous casting and rolling
High purity steel water continuous casting becomes the circle base, and at the rotary heating furnace internal heating, furnace temperature is 1300～1320 ℃ with cooled continuously cast bloom, 1250～1240 ℃ of heat centering temperature, 1230～1220 ℃ of hot piercing temperature, 1100～1050 ℃ of tandem rolling temperature, 890～910 ℃ of sizing temperature, cooling, sawing.
(3) pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 920 ℃ ± 10 ℃, and quenchant is a water, and tempering temperature adopts air cooling at 630 ℃ ± 10 ℃.After the petroleum casing pipe thermal treatment, need through row sizing and straightening processing, the sizing mill temperature is between 630～610 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～520 ℃ at last.
That adopts that this method produces has high strength and high toughness petroleum casing pipe, its yield strength: 1034～1172MPa, tensile strength 〉=1120MPa, unit elongation 〉=16%, a ballistic work 〉=80J.
Introduce the effect of each manufacturing process below respectively:
Ring furnace:
Process furnace is divided into preheating section, heating zone, soaking zone successively, and each section is further divided into some control regions, control region of preheating section for example, four control regions of heating zone, control region of soaking zone, last discharge zone.Each control region is controlled by different temperature, realizes the reasonable heating to pipe, meets the requirements of heating quality, to improve temperature control precision.
Heating of pipe blank temperature: 1290～1280 ℃, allow the temperature difference: ± 5 ℃
Piercing process:
Adopt two roller cone-type piercer machines, reduce the perforated shear strain of high quality steel, prevent defectives such as the hollow billet surface cracks, folding, absciss layer.The unit elongation of getting perforation is 2.5～3.6, diameter-wall-rate 18～25, enlarging rate be below 30%, the velocity of discharge of tapping machine is below 1.1m/s, require diameter tolerance≤± 1.4%, ovality tolerance≤2.5% of continuous casting circular tube blank, guarantee the geometrical dimension and the form accuracy of hollow billet.1230～1220 ℃ of piercing temperatures, pipe is 1.5 ~ 1.8 with the ratio of the cross-sectional area of hollow billet.
Continuous rolling process:
The continuous rolling process purpose is that perforation process is transferred the hollow billet that comes to be carried out tube reducing, extend and the corresponding wall that subtracts, and improves the inside and outside surface smoothness of hollow forging simultaneously, improves the wall thickness uniformity coefficient.
During tandem rolling, the hollow billet internal surface contacts with plug at place, pass top, does not then contact with plug in side-walls.The metal at pass top, owing to the pressure effect of external pressure that is subjected to roll and plug is extended, and produce spreading of circumferential direction simultaneously axially extended, and the metal of the sidewall of pass also is stretched when the pass top metal is extended, and is correspondingly vertically producing pulling-down.At this moment, because the ratio of spreading with sidewall of pass metal pulling-down quantity of pass top metal does not match, interior rib will occur, roll folding, folding, scab, draw defectives such as recessed outward.Simultaneously, the draft of control tandem rolling each procedure makes the long-pending ratio in the effective cross section long-pending and pipe, effective cross section of production tube between 5.0～10.0, with reaching unanimity to ballistic work in length and breadth of assurance petroleum casing pipe.
The velocity of discharge of tandem rolling is at 1.319m/s, velocity of discharge 3.5m/s, and hollow billet is 2.7 with the ratio of the cross-sectional area of hollow forging.1100～1050 ℃ of tandem rolling temperature.
Fixed diameter process:
The sizing process is the process of a hollow body tandem rolling, and except playing sizing, requiring that also bigger reducing rate, work housing number are arranged is 24.At first remove the iron scale that the hollow forging from the tandem rolling unit produces in the operation of rolling with the high pressure water descaling device of 20MPa, rolling in sizing mill then.
The fixed diameter rolling temperature is 890～910 ℃, and velocity of discharge is 2.4m/s, and the long-pending ratio in effective cross section is 1.12.
(3) pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 920 ℃ ± 10 ℃, and quenchant is a water, and tempering temperature adopts air cooling at 630 ℃ ± 10 ℃.After the petroleum casing pipe thermal treatment, need through row sizing and straightening processing, the sizing mill temperature is between 630～610 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～520 ℃ at last.
Quenching technology:
Petroleum casing pipe is heated to 910 ℃～930 ℃, is incubated 30 minutes, fully form austenite, quenchant is a water.Improve the intensity and the hardness of steel.Tempering process:
Tempering temperature is incubated 2 hours at 620 ℃～640 ℃, adopts air cooling.Crystal grain thinning makes homogeneous microstructureization, eliminates internal stress.
Fixed diameter process:
Select rational sizing parameter, reduce the unrelieved stress that sizing produces, improve the size and the circularity precision of petroleum casing pipe, improve the mechanical property of petroleum casing pipe.
The sizing temperature is between 630～610 ℃, and the sizing velocity of discharge of steel pipe is 2.4m/s.
Straightening process:
Select best aligning coefficient of draught, reduce to align the unrelieved stress that processing produces, improve the circularity and the linearity of petroleum casing pipe, improve the performance of petroleum casing pipe.
The hot straightening temperature is between 500 ℃～520 ℃.
The index that the mechanical property of described petroleum casing pipe reaches is as follows:
Yield strength: 1034～1172MPa
Tensile strength: 〉=1120MPa
Impelling strength: vertical full-scale Charpy-V impact power (0 ℃) 〉=80J
Horizontal full-scale Charpy-V impact power (0 ℃) 〉=80J
Unit elongation: 〉=16%
Sleeve pipe overall performance (is example with φ 244.48 * 15.11)
Body collapse resistance: 〉=79.8MPa
Slippage strength: 〉=2750KN
Yield strength: 〉=111.9MPa in the body
Unrelieved stress :≤200MPa
The geometrical dimension of petroleum casing pipe
Diameter range: 245.00mm～246.90mm
Out of roundness :≤1.1mm
Wall thickness :-8.0%t～8.0%t
Straight degree: pipe end 1.5mm/m, body 1.5 ‰
Embodiment:
By above-mentioned composition and method produce petroleum casing pipe V150 (by 244.48 * 15.11mm), its chemical ingredients and fabrication process parameters are as follows:
The weight item of petroleum casing pipe is: C:0.23%, Si:0.27%, Mn:0.50%, Cr:1.00%, Mo:0.73%, Al:0.030%, Ni:0.05%, Cu:0.070%, V:0.080%, Ca:0.0016%, P:0.008%, S:0.001%, all the other are iron.
Adopt sponge iron and steel scrap to do steelmaking feed, be fused into molten steel with electric arc furnace, after external refining and vacuum outgas, obtain chemical ingredients as mentioned above, continuous casting becomes the circle base; At the rotary heating furnace internal heating, furnace temperature is 1310 ℃ with cooled continuously cast bloom, and heat centering is 1250 ℃, and hot piercing is 1225 ℃, and the tandem rolling temperature is 1080 ℃, and sizing is 900 ℃, cooling, sawing; Thermal treatment: in 920 ℃ of quenchings (shrend), 630 ℃ of tempering: at 620 ℃ of hot sizes, 510 ℃ of hot straightenings, flaw detection at last.
The index that described telescopic mechanical property reaches is as follows:
Yield strength: 1106MPa
Tensile strength: 1176Mpa
Impelling strength: vertical full-scale Charpy-V impact power (0 ℃): 121J
Horizontal full-scale Charpy-V impact power (0 ℃): 114J
Unit elongation: 17%
Sleeve pipe overall performance (is example with φ 244.48 * 15.11)
Body collapse resistance: 93.1MPa
Slippage strength: 3208KN
Yield strength: 130.6MPa in the body
Unrelieved stress: 173.71MPa
The geometrical dimension of petroleum casing pipe
Diameter range: 245.90mm～246.20mm
Out of roundness :≤0.6mm
Wall thickness :-4.5%t～7.0%t
Straight degree: pipe end 1.2mm/m, body 1.1 ‰
Claims (2)
1. one kind has high strength and high toughness petroleum casing pipe, the weight proportion of sleeve pipe steel grade component is: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron.
2. rolling manufacture method with high strength and high toughness petroleum casing pipe, its step includes:
1. batching is smelted
By above-mentioned steel grade component weight item be: C:0.22～0.4%, Si:0.17～0.35%, Mn:0.45～0.60%, Cr:0.95～1.10%, Mo:0.70～0.80%, Al:0.015～0.040%, Ni＜0.20%, Cu＜0.20%, V:0.070～0.100%, Ca＞0.0015%, P＜0.010%, S＜0.003%, all the other are iron;
2. continuous casting and rolling
High purity steel water continuous casting becomes the circle base, and at the rotary heating furnace internal heating, furnace temperature is 1300～1320 ℃ with cooled continuously cast bloom, 1250～1240 ℃ of heat centering temperature, 1230～1220 ℃ of hot piercing temperature, 1100～1050 ℃ of tandem rolling temperature, 890～910 ℃ of sizing temperature, cooling, sawing;
For reducing rollingly to cause the transverse impact performance decrease than the excessive increase that causes each diversity of material, roll than be controlled at＜10: 1, promptly the pipe cross-sectional area in the steel pipe cross-sectional area than less than 10: 1;
3. pipe processing
Tempered thermal treatment process again after adopt quenching, quenching temperature is 920 ℃ ± 10 ℃, and quenchant is a water, and tempering temperature adopts air cooling at 630 ℃ ± 10 ℃; After the petroleum casing pipe thermal treatment, need through row sizing and straightening processing, the sizing mill temperature is between 630～610 ℃, and the hot straightening temperature is detected a flaw between 500 ℃～520 ℃ at last;
The index that the mechanical property of described petroleum casing pipe reaches is as follows:
Yield strength: 1034～1172MPa
Tensile strength: 〉=1120MPa
Impelling strength: vertical full-scale Charpy-V impact power 〉=80J
Horizontal full-scale Charpy-V impact power 〉=80J
Unit elongation: 〉=16%.
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| CN102400065A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | High-toughness ultrahigh-strength seamless steel pipe for oil well and manufacturing method thereof |
| CN101914666A (en) * | 2010-09-19 | 2010-12-15 | 天津钢管集团股份有限公司 | Method for improving transverse impact toughness of seamless steel tube |
| CN102179681A (en) * | 2011-03-30 | 2011-09-14 | 盛泽能源技术有限公司 | Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically |
| CN102179681B (en) * | 2011-03-30 | 2012-10-17 | 盛泽能源技术有限公司 | Pipe mold manufacturing process adopting continuous-casting blank to forge and roll rough blank periodically |
| CN102242321A (en) * | 2011-06-30 | 2011-11-16 | 天津钢管集团股份有限公司 | Sulfide stress cracking (SSC) corrosion-resistant C110 steel grade petroleum special pipe steel and preparation method thereof |
| CN102699149A (en) * | 2012-06-19 | 2012-10-03 | 河南兴华机械制造有限公司 | Method for straightening shaft piece deformed after heat treatment |
| CN103451543A (en) * | 2013-09-10 | 2013-12-18 | 内蒙古包钢钢联股份有限公司 | Oil casing for ultra-deep well and production technology thereof |
| CN103556084A (en) * | 2013-11-13 | 2014-02-05 | 江苏华菱锡钢特钢有限公司 | Oil sleeve steel ball and manufacturing process thereof |
| DE112016002733T5 (en) | 2015-06-18 | 2018-04-19 | Baoshan Iron & Steel Co.,Ltd. | Ultrahigh-strength and ultra high-performance casing steel, oil piping and manufacturing method thereof |
| CN105063324A (en) * | 2015-09-08 | 2015-11-18 | 天津钢管集团股份有限公司 | Heat treatment method of high-strength hydrogen-sulfide-corrosion-resistant seamless steel tube for oil wells |
| CN105886719A (en) * | 2016-05-25 | 2016-08-24 | 内蒙古包钢钢联股份有限公司 | Method for controlling 16 Mn seamless steel tube blank heating |
| CN114622143A (en) * | 2022-02-10 | 2022-06-14 | 天津钢管制造有限公司 | 140-155ksi oil and gas exploitation casing pipe and production method thereof |
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Effective date of registration: 20190621 Address after: No. 396 Jintang Highway, Dongli District, Tianjin 300301 Patentee after: Tianjin Steel Tube Manufacturing Co., Ltd. Address before: 300301 Jintang Road, Dongli District, Tianjin Patentee before: Tianjin Steel Pipe Group Co., Ltd. |