CN102235554A - L485Q (X70Q) grade pipeline steel pipe for low temperature acidic environment and manufacturing method thereof - Google Patents
L485Q (X70Q) grade pipeline steel pipe for low temperature acidic environment and manufacturing method thereof Download PDFInfo
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Abstract
The invention provides an L485Q (X70Q) grade pipeline steel pipe for a low temperature acidic environment and a manufacturing method thereof. The steel pipe comprises the following chemical components in percentage by weight: 0.11 to 0.17 percent of C, 0.17 to 0.37 percent of Si, 0.35 to 0.65 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.006 percent of S, 0.40 to 0.70 percent of Cr, 0.04 to 0.09 percent of V, 0.02 to 0.05 percent of Al, less than or equal to 0.20 percent of Ni, less than or equal to 0.25 percent of Cu, less than or equal to 0.008 percent of N, less than or equal to 0.0002 percent of H and the balance of Fe and irremovable impurity elements. The steel pipe is prepared from the raw material components by steelmaking, rolling, hardening and tempering, and anticorrosive treatment. The steel pipe can be used in the low temperature acidic environment of between -30 and -60 DEG C, and the technical problem that the conventional high-strength steel pipe is unsuitable for the environment is solved.
Description
Technical field
The present invention relates to a kind of low temperature sour environment L485Q (X70Q) level pipeline steel tube and manufacture method thereof.
Background technique
Along with the develop rapidly of World Economics, the demand of oil, rock gas is increased day by day, the petroleum production of common land makes the storage surplus in these zones fewer and feweri.Some national petroleum resources recovery activity are carried out to comparing the rugged environment from existing resource transfers gradually.At the polar areas of the earth (high and cold, deep-sea etc.) as Russia, Canada, all be richly stored with oil, natural gas resources such as Daqing oil field of the U.S., China and part area, Kelamayi, Xinjiang.The temperature of these regional cold seasons is at-30 ℃～-40 ℃, and the northern temperature record high of Russia is-60 ℃.
The resource exploitation that these are regional, the conveyance conduit of oil, rock gas also requires pipeline to have good low-temperature impact toughness and corrosion resistance when guaranteeing sufficient intensity, guarantees the conveying job safety of oil, rock gas under the cold end corrosion environment.Under this extremely abominable operating environment, demand developing the seamless steel pipe in the oil gas conveying engineering that is applicable to this bad working environments urgently.
Some factories generally all are to adopt " C-Mn " series when manufacturing and designing equal grade of steel, suitably reduce C% and reduce yield strength and give compensation with 2～3 times of ground increase Mn% Lai Give, reach erosion-resisting purpose by the S% that controls low content.In actual applications, have the problem of the following aspects: when (1) Mn% content was higher, though can improve the hardenability of steel consumingly, the temper brittleness of steel obviously strengthened; (2) " C-Mn " Series Steel is with the improve of intensity and hardness, and the receptance of hydrogen induced cracking (HIC) (HIC) increases; (3) Mn mainly plays the solution strengthening effect in steel, but Mn is easy segregation element, causes the banded structure of steel pipe serious, strengthens anisotropy, reduces the H2S corrosivity.
Summary of the invention
In view of the problem that exists in the above-mentioned technology, the object of the present invention is to provide a kind of low temperature sour environment L485Q (X70Q) level pipeline steel tube and manufacture method thereof, this steel pipe can use under-30 ℃～-60 ℃ cold end corrosion environment, thereby impel the oil under the cold end corrosion environment of this kind harshness, the conveying of rock gas, solve under this kind cold end corrosion environment general High Tensile Steel Tube because the not enough technical barrier of low temperature resistant anti-corrosion capacity.
The present invention's technological scheme that adopts of dealing with problems is:
A kind of low temperature sour environment L485Q (X70Q) level pipeline steel tube, the chemical composition of this steel pipe is by weight percentage: C:0.11%～0.17%, Si:0.17%～0.37%, Mn:0.35%～0.65%, P≤0.015%, S≤0.006%, Cr:0.40%～0.70%, V:0.04%～0.09%, Al:0.02%～0.05%, Ni≤0.20%, Cu≤0.25%, N≤0.008%, H≤0.0002% surplus are Fe and the impurity element that cannot remove.
On the outer surface of this steel pipe, be arranged with polyethylene layer.
On the outer surface of this steel pipe, be arranged with the three-layer polyethylene layer.
On the internal surface of this steel pipe, be coated with the nano-material coating that titanium alloy powder is made.
The manufacture method of above-mentioned steel pipe may further comprise the steps,
(1), steel-making and casting
1. adopt the low high-quality steel scrap of slag inclusion constituent content to deepen desulfurization (S), phosphorus (P) molten iron, add the composition raw material of above-mentioned low temperature sour environment with steel pipe again, the utilization converter is smelted.
2. carry out continuous casting and cast circular pipe blank.
(2), tube rolling
In annular furnace, the above-mentioned pipe of casting circle is heated, heating-up temperature is 1240 ℃-1260 ℃, the perforation of use punch, adopt Diesel's milling train controlled rolling precision, be rolled by retained mandrel, behind dephosphorize by high pressure water, pass through 14 accurate sizings of sizing mill again, after cooling on the cold bed, sawing, aligning.
(3), quenching with Subsequent tempering
Steel pipe behind the aligning is heated to 860 ℃～880 ℃ in high temp, quenching furnace be incubated and quench as quenching liquid with industrial circulating water, in tempering furnace, be heated to 580 ℃～630 ℃ and insulation then, carry out high-temperature tempering, carry out high-temperature straightening after going out tempering furnace, the straightening temperature scope is at 400 ℃～500 ℃; Steel pipe after the quenching with Subsequent tempering is by ultrasonic flaw detection, hydrostatic test operation.
(4), preservative treatment
At the above-mentioned three-layer polyethylene layer that on the outer surface of steel tube of quenching with Subsequent tempering, is coated with, be coated with the nano-material coating that titanium alloy powder is made on the internal surface, at last spray mark, packing.
The main component design principle is as follows:
Carbon (C): the high shrend cracking sensitivity of Kohlenstoffgehalt improves, and welding performance reduces, and should adopt carbon content is 0.11～0.17%.
Manganese (Mn): can improve the hardenability of steel, but the too high segregation of content is serious, corrosion resistance reduces, and should adopt manganese content is 0.35～0.65%.
Sulphur (S): sulphur and iron easily form FeS, and the FeS-Fe eutectic melts easily and causes cracking when hot working, the Sulpher content height, and its corrosion resistance descends, and should adopt Sulpher content is 0～0.006%.
Phosphorus (P): phosphorus and iron easily form frangible compounds Fe3P, and the fragility of steel is increased, and particularly more remarkable when low temperature, the toughness of steel acutely descended when temperature descended, and should adopt phosphorus content is 0～0.015%.
Silicon (Si): can improve the yield strength and the hardness of steel, but yield strength and hardness are too high, corrosion resistance reduces, and should adopt silicone content is 0.17～0.37%.
Chromium (Cr): can improve the hardenability of steel strongly, carbide precipitate improves the intensity of steel during tempering, can also improve the corrosion resistance of steel.But the too high carbide of separating out of content is thick, reduces the corrosion resistance of steel, and should adopt chromium content is 0.40～0.70%.
Nickel (Ni): can improve the hardenability and the low-temperature flexibility of steel, can also improve the antiacid corrosion ability of steel, should adopt nickel content is 0～0.20%.
Aluminium (Al): the deoxidation nitrogen killer, but crystal grain thinning improves the corrosion resistance of steel, and should adopt aluminium content is 0.02～0.05%.
Vanadium (V): the effect of strong crystal grain thinning is arranged, can improve the corrosion resistance and the low-temperature flexibility of steel, should adopt content of vanadium is 0.04～0.09%.
Nitrogen (N): utilize the AlN of disperse can stop steel austenite crystal when heating to be grown up, obtain thin crystal grain, improve the intensity and the toughness of steel, should adopt nitrogen content is 0～0.008% (80PPM).
Hydrogen (H): hydrogen makes the plasticity of steel and toughness reduce in steel, so the content of hydrogen is 0～0.0002% (2PPM) in the steel.
Copper (Cu): separate out with ε-Cu and α-Cu in steel, can improve the corrosion resistance of steel, should adopt copper content is 0～0.25%.
Beneficial effect of the present invention: adopt the steel pipe of making after above composition and the technology to have good physicochemical performance, usability, and can under-30 ℃～-60 ℃ cold end corrosion environment, use safely.Reach at its SMYS under the prerequisite of 485MPa, its horizontal full-scale normal temperature impact absorbing energy reaches 110J, vertical full-scale normal temperature impact absorbing energy reaches 150J, in-30 ℃～-60 ℃ temperature range, horizontal, vertical full-scale summer is respectively 70J and minimum 90J than impact absorbing energy, and ductile-brittle transition temperature is-60 ℃.
Description of drawings
Fig. 1 is a sectional view of the present invention
Embodiment
In conjunction with the embodiments anti--30 ℃～-60 ℃ anticorrosive steel pipes of low temperature of the present invention and manufacture method thereof are illustrated.
Each component content of steel pipe be C:0.15%, Si:0.28%, Mn:0.56%, P:0.012%, S:0.003%,, Cr:0.61%,, all the other elements that can not remove for Fe and content of V:0.07%, Al:0.03%, Ni:0.15%, Cu:0.15%, N:0.006%, H:0.0002%.
Production process is as follows:
1 steel-making
Adopt the low high-quality steel scrap of slag inclusion constituent content to deepen desulfurization, ferrophosphorus water, add the anticorrosive steel pipe composition of above-mentioned low temperature raw material, the utilization converter is smelted, and by add the lime making foamed slag of high activity degree in molten steel, fully adsorbs harmful element P, S etc. in the molten steel.Use eccentric bottom tapping, adopt unique Clean Steel technology again, promptly ladle furnace refining, vacuum outgas, Control and Inclusion Removal technology ' are promptly wrapped core silk hello silk and are handled, carry out external refining.Strict control molten steel chemical composition, by making foam white slag technology, the purification molten steel composition, and change inclusion morphology by feeding Si-Ca silk in molten steel, the tiny spherical composite disperse that makes sulphide in the steel (MnS) be transformed into Ca by calcium distributes.Carry out vacuum outgas then, guarantee that high vacuum time is not less than 8～12 minutes, the gas in the molten steel is fully removed, reduce to greatest extent that bubble is mingled with in the steel, carry out continuous casting at last and cast circular pipe blank, strict control molten steel overheat, casting speed and cooling water inflow.
2 tube rollings
With heating of pipe blank, heating-up temperature is 1250 ℃ in annular furnace, uses the punch perforation, by advanced person's retained mandrel Diesel mill milling, is a sizing by the accurate sizing of sizing mill again, after cooling on the cold bed, and aligning.
3, steel pipe quenching with Subsequent tempering and processing
Steel pipe behind the aligning is heated to 870 ℃ in the hot quenching oven, insulation is also quenched, and guarantees during quenching that quenching liquid sprays in steel pipe internal-surface high speed Rotating with Uniform, and the circulating water that outer surface has enough flows drenches outward; Be heated to 590 ℃ then in the tempering oven, carry out high-temperature tempering, the steel pipe after tempering is come out of the stove carries out the high temperature sizing after dephosphorize by high pressure water is removed outer surface of steel tube scale be the secondary sizing.The purpose of secondary sizing is to guarantee the precision of outer diameter of steel pipes and the quality of outer surface.Adopt the residual stress technology for eliminating to carry out high-temperature straightening, temperature is 450 ℃; Pass through ultrasonic flaw detection, hydrostatic test operation after the quenching with Subsequent tempering.
4. corrosion treatment
As shown in fig. 1, also be coated with three- layer polyethylene layer 1,1,1 at above-mentioned steel pipe 100 outer surfaces through quenching with Subsequent tempering, the total thickness of three- layer polyethylene layer 1,1,1 is 15～20mm, the purpose that coats polyethylene layer 1 can be on the one hand with steel pipe and air insulated, prevent the steel pipe oxidation, can play the effect of insulation on the other hand; On internal surface, be coated with simultaneously the nano-material coating 2 that titanium alloy powder is made; coating 2 adopts static to be sprayed on steel pipe internal-surface equably; packing into, baking hardening forms in 250 ℃ the oven; thickness is 0.10～0.15mm; when oil, rock gas are carried in pipeline; the effect that coating 2 plays protective film slows down Corrosion of Pipeline.
Spray is at last marked, packing.
Each component content of steel pipe be C:0.12%, Si:0.33%, Mn:0.41%, P:0.01%, S:0.005%,, Cr:0.45%,, all the other elements that can not remove for Fe and content of V:0.05%, Al:0.05%, Ni:0.1%, Cu:0.25%, N:0.005%, H:0.00015%.
Its production process is identical as described in example 1 above, and just annular furnace heating of pipe blank temperature is 1260 ℃, 880 ℃ of quenching temperatures, 580 ℃ of tempering temperatures, 470 ℃ of high-temperature straightening temperature.
Embodiment 3
Each component content of steel pipe be C:0.16%, Si:0.19%, Mn:0.39%, P:0.013%, S:0.004%,, Cr:0.52%,, all the other elements that can not remove for Fe and content of V:0.04%, Al:0.04%, Ni:0.08%, Cu:0.18%, N:0.003%, H:0.0002%.
Its production process is identical as described in example 1 above, and just annular furnace heating of pipe blank temperature is 1250 ℃, 860 ℃ of quenching temperatures, 620 ℃ of tempering temperatures, 500 ℃ of high-temperature straightening temperature.
This kind low temperature sour environment with L485Q (X70Q) level pipeline steel tube performance is: the minimum 485MPa (grade of steel L485Q) of being of yield strength, tensile strength 〉=570MPa, the full-scale summer of horizontal and longitudinal direction is respectively minimum 110J and minimum 150J than impact absorbing energy under the normal temperature, ductile-brittle transition temperature is-60 ℃, in-40 ℃～-60 ℃ temperature range, the full-scale summer of horizontal and longitudinal direction is respectively 70J and minimum 90J than impact absorbing energy.
Following each table and figure are the performance data of low temperature resistant sour environment with L485Q (X70Q) steel pipe:
1) mechanical property under the normal temperature
Table 1
| Group | Rt0.5(MPa) | Rm(MPa) | Rt0.5/Rm | Specific elongation %, gauge | Microstructure | |
| 1 | 495/500 | 667/675 | 0.74/0.74 | 38 | S returns, 10 grades of |
|
| 2 | 525/510 | 655/665 | 0.80/0.76 | 36 | S returns, 10 grades of grain sizes | |
| 3 | 510/520 | 650/660 | 0.78/0.79 | 39 | S returns, 10 grades of grain sizes | |
| 4 | 515/518 | 660/670 | 0.78/0.77 | 38 | S returns, 10 grades of grain sizes |
2) impact toughness (the same tension test of sampling location) under the normal temperature
Table 2
| Group | Size mm | Traverse impact value J | % is compared in shearing | Size | Impact of collision value J | % is compared in |
| 1 | 10×10 ×55 | 110/112/115 | 100 | 10×10 ×55 | 152/150/155 | 100 |
| 2 | 10×10 ×55 | 111/110/118 | 100 | 10×10 ×55 | 157/152/155 | 100 |
| 3 | 10×10 ×55 | 121/112/114 | 100 | 10×10 ×55 | 155/155/156 | 100 |
| 4 | 10×10 ×55 | 112/117/112 | 100 | 10×10 ×55 | 150/158/150 | 100 |
3) serial low-temperature impact toughness
Table 3
| Temperature | Size mm | Traverse impact value J | % is compared in shearing | Size | Impact of collision value J | % is compared in shearing |
| - 0℃ | 10×10× 55 | 108/110/110 | 100 | 10×10 ×55 | 145/149/140 | 100 |
| - 20℃ | 10×10× 55 | 100/107/105 | 100 | 10×10 ×55 | 138/140/135 | 100 |
| 40℃ | 10×10× 55 | 90/100/95 | 100 | 10×10 ×55 | 110/112/120 | 100 |
| - 60℃ | 10×10× 55 | 70/73/78 | 100 | 10×10 ×55 | 90/100/93 | 100 |
4) ductile-brittle transiton curve
Adopt through the steel pipe after the above-mentioned quenching with Subsequent tempering production, produce full-scale 10 * 10 * 55mm shock test sample, do serial impact experiment, obtain the ductile-brittle transiton plotted curve, from plotted curve as can be seen, ductile-brittle transition temperature is greatly about-60 ℃, laterally still has ballistic work about 70J-60 ℃ of following low-temperature zone, in-30 ℃～-60 ℃ temperature range scopes, impact toughness is than higher, and horizontal, vertical full-scale summer is respectively 70J and minimum 90J than impact absorbing energy.
5) corrosion resistance (HIC)
The anti-HIC corrosivity of steel pipe (96h) %
| Grade of steel and standard | CLR | CTR | CSR |
| L485Q (X70Q) checkout value | 0 | 0 | 0 |
| NACE TM0284 requirement | 15 | 5 | 2 |
CLR: crack length rate
CTR: crack thickness rate
CSR: the responsive rate of crackle
Claims (5)
1. a low temperature sour environment is with L485Q (X70Q) level pipeline steel tube, it is characterized in that: the chemical composition of this steel pipe is by weight percentage: C:0.11%～0.17%, Si:0.17%～0.37%, Mn:0.35%～0.65%, P≤0.015%, S≤0.006%, Cr:0.40%～0.70%, V:0.04%～0.09%, Al:0.02%～0.05%, Ni≤0.20%, Cu≤0.25%, N≤0.008%, H≤0.0002% surplus are Fe and the impurity element that cannot remove.
2. a kind of low temperature sour environment described in claim 1 is characterized in that: be arranged with polyethylene layer on the outer surface of this steel pipe with L485Q (X70Q) level pipeline steel tube.
3. a kind of low temperature sour environment described in claim 2 is characterized in that: be arranged with the three-layer polyethylene layer on the outer surface of this steel pipe with L485Q (X70Q) level pipeline steel tube.
4. a kind of low temperature sour environment described in claim 1 is characterized in that: be coated with the nano-material coating that titanium alloy powder is made on the internal surface of this steel pipe with L485Q (X70Q) level pipeline steel tube.
5. the manufacture method of the steel pipe described in claim 1 may further comprise the steps,
(1), steel-making and casting
1. adopt the low high-quality steel scrap of slag inclusion constituent content to deepen desulfurization (S), phosphorus (P) molten iron, add the composition raw material of above-mentioned low temperature sour environment with steel pipe again, the utilization converter is smelted;
2. carry out continuous casting and cast circular pipe blank;
(2), tube rolling
In annular furnace, the above-mentioned pipe of casting circle is heated, heating-up temperature is 1240 ℃-1260 ℃, the perforation of use punch, adopt Diesel's milling train controlled rolling precision, be rolled by retained mandrel, behind dephosphorize by high pressure water, pass through 14 accurate sizings of sizing mill again, after cooling on the cold bed, sawing, aligning;
(3), bury at modified place
Steel pipe behind the aligning is heated to 860 ℃～880 ℃ insulations in high temp, quenching furnace, and quench as quenching liquid with industrial circulating water, in tempering furnace, be heated to 580 ℃～630 ℃ and insulation then, carry out high-temperature tempering, carry out the secondary sizing after going out tempering furnace, and carry out high-temperature straightening, the straightening temperature scope is at 400 ℃～500 ℃; Steel pipe after the quenching with Subsequent tempering is by ultrasonic flaw detection, hydrostatic test operation;
(4), preservative treatment
Above-mentioned steel pipe through quenching with Subsequent tempering is coated with the three-layer polyethylene layer on the outer surface, be coated with the nano-material coating that titanium alloy powder is made on the internal surface, at last spray mark, packing.
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| CN 201010152573 CN102235554A (en) | 2010-04-22 | 2010-04-22 | L485Q (X70Q) grade pipeline steel pipe for low temperature acidic environment and manufacturing method thereof |
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| CN 201010152573 CN102235554A (en) | 2010-04-22 | 2010-04-22 | L485Q (X70Q) grade pipeline steel pipe for low temperature acidic environment and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060619A (en) * | 2021-11-09 | 2022-02-18 | 湖南隆盛达钢管制造有限公司 | Anti-corrosion thick-wall spiral steel pipe and machining method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2304797Y (en) * | 1997-07-10 | 1999-01-20 | 重钢集团中兴实业公司 | Composite steel pipe |
| CN1368612A (en) * | 2002-02-22 | 2002-09-11 | 武汉重工铸锻有限责任公司 | Technology for manufacturing large-diameter thick-wall seamless steel pipe |
| US20050006900A1 (en) * | 2003-07-09 | 2005-01-13 | Lewis John K. | System and method for coupling conduit |
| CN101418421A (en) * | 2008-12-09 | 2009-04-29 | 山东墨龙石油机械股份有限公司 | High intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same |
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2010
- 2010-04-22 CN CN 201010152573 patent/CN102235554A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2304797Y (en) * | 1997-07-10 | 1999-01-20 | 重钢集团中兴实业公司 | Composite steel pipe |
| CN1368612A (en) * | 2002-02-22 | 2002-09-11 | 武汉重工铸锻有限责任公司 | Technology for manufacturing large-diameter thick-wall seamless steel pipe |
| US20050006900A1 (en) * | 2003-07-09 | 2005-01-13 | Lewis John K. | System and method for coupling conduit |
| CN101418421A (en) * | 2008-12-09 | 2009-04-29 | 山东墨龙石油机械股份有限公司 | High intensity oil casing tube for resisting sulfurated hydrogen corrosion and method for producing the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060619A (en) * | 2021-11-09 | 2022-02-18 | 湖南隆盛达钢管制造有限公司 | Anti-corrosion thick-wall spiral steel pipe and machining method thereof |
| CN114060619B (en) * | 2021-11-09 | 2023-09-01 | 湖南隆盛达钢管制造有限公司 | Corrosion-resistant thick-wall spiral steel pipe and processing method thereof |
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Application publication date: 20111109 |