CN105695898B - A kind of floating LNG pipelines X70Q hot-rolled thick planks and its production method - Google Patents
A kind of floating LNG pipelines X70Q hot-rolled thick planks and its production method Download PDFInfo
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Abstract
The present invention provides floating LNG pipelines X70Q hot-rolled thick planks, and steel plate thickness >=31mm, ingredient is by weight percentage：C：0.040%~0.075%, Si：0.16%~0.29%, Mn：1.50%~1.75%, P≤0.015%, S≤0.002%, Nb：0.03%~0.05%, Ti：0.021%~0.039%, V：0.07%~0.09%, Als：0.021%~0.039%, N：0.003%~0.006%, Ti/N：3.42~6.95, Mo：0~0.14%, Ni：0.10%~0.19%, Cu：0.10%~0.19%, Cr ＜ 0.15%, (Mo+Ni+Cu)：0.25%~0.40%, balance iron and inevitable impurity；Method：Refining controlling (O+N+H)≤80PPm；1010~1120 DEG C of roughing temperature, every time deflection >=12% add up deflection >=54%, and 770~860 DEG C of final rolling temperature adds up deflection 61%~73%；Roller repairing and heat treatment are quenched using press quenching+tempering or ACC+.Technique is flexible, convenient to carry out, and steel plate residual stress is small, and structural banding and component segregation are low, and heterogeneous microstructure and performance are stablized under service condition.
Description
Technical field
The invention belongs to low-carbon low-alloy steel field more particularly to a kind of exploitation of ocean natural gas, transport floating LNG projects
The X70Q hot-rolled thick planks and its production method of pipeline thickness >=31mm.
Background technology
As the world increasingly increases oil and natural gas demand and Land petroleum resource is petered out；Emerging oil gas
The exploitation target of resource is gradually shifted to ocean.In recent years, various countries pay attention to the exploration and exploitation of seabed resources further, accordingly
Sea-bottom oil-gas exploitation transports project and the construction of facility is significantly increased, and the demand to respective lines steel plate, steel pipe increasingly increases
Greatly.
LNG (Liquefied Natural Gas) refers to liquefied natural gas, and floating LNG projects are in ocean natural gas engineering
A kind of novel offshore gas field exploration project, collect the purification of offshore natural gas, liquefaction, store, regasify, loading and unloading and it is outer it is defeated be one
Body has many advantages, such as that the construction period is short, small convenient for migration and reusable and effect on environment, is following offshore oil and gas project
The key areas built.Pipe line steel used in floating LNG projects is generally quenched and tempered state product, and thickness is relatively large, in addition to wanting
Steel plate is asked to ensure to should also have good low-temperature flexibility, corrosion resistance, weldability etc. outside corresponding intensity, it is steady to have both structure property
Calmly, the features such as internal stress is low.
Floating LNG projects pipeline requires yield strength 500-605MPa, tensile strength with the X70Q steel plates of thickness >=31mm
570-760MPa, yield tensile ratio≤0.90, average impact work(>=150J at -30 DEG C, the DWTT average tenacities section of shear at -20 DEG C >=
85%.
In general, its bigger crystal grain refinement of the thickness of pipe line steel and Microstructure Uniformity control are more difficult, cause
DWTT performances significantly deteriorate, and therefore, the DWTT Properties Controls of big wall thickness (thickness is more than 30mm) pipe line steel are always pipe line steel life
The great difficult problem of application is produced, has seriously affected the construction of corresponding oil-gas pipeline conveying project.Meanwhile floating LNG projects pipeline one
As for quenched and tempered state product, and usual hot-bending bends and pipe fitting are quenched and tempered state product in oil-gas pipeline, but do not ensure DWTT performances；
In addition, the construction of various countries' floating LNG projects is in the starting stage, and it is insufficient to the research of floating LNG pipeline steels, in big wall thickness
Research and development almost blank in terms of floating LNG pipeline steels.
《A kind of low temperature acid environment L485Q (X70Q) grade pipeline steel tubes and its manufacturing method》(CN102235554A),
A kind of pipeline steel tube is disclosed, chemical component weight percentage is C：0.11%~0.17%, Si：0.17%~0.37%,
Mn：0.35%~0.65%, P≤0.015%, S≤0.006%, Cu≤0.25%, Ni≤0.20%, V：0.04%~
0.09%th, Cr：0.40%~0.70%, Al：0.02%~0.05%, N≤0.008%, H≤0.0002%；Its shortcoming
It is, C content is higher, and it is seamless pipe that -20 DEG C of impact flexibility mean values, which only reach 100J or so and steel pipe, does not ensure DWTT
Energy；Steel pipe must handle through corrosion-inhibiting coating and can be only achieved anticorrosive requirement, be not suitable for the raw material as floating LNG steel pipes.
《A kind of quenching and tempering type Pipeline Steel Plate and its production method》(CN103266287A), the pipe line steel disclosed chemistry into
It is C to divide weight percent：0.08%~0.12%, Si：0.20%~0.40%, Mn：1.10%~1.60%, P≤
0.008%th, S≤0.002%, Ti：0.010%~0.030%, Al：0.020%~0.055%, Ni：0.20%~0.50%,
Mo：0.20%~0.50%, V：0.03%~0.06%, Nb：0.02%~0.05%, Cr：0.20%~0.50%, it is insufficient
Part is that pipe line steel precious alloy content is more, and does not introduce steel plate DWTT performances, and be not directed to hardening and tempering process.
《A kind of production method of the pipeline excellent high-strength hot-rolled steel band of low temperature block hammer performance》(KR20060028967
(A)) a kind of hot rolling pipe line steel, is disclosed, although having good DWTT performances at -20 DEG C, its steel plate thickness is less than 15mm,
The requirement of floating LNG heavy walls X70Q can not be met, and contain Ni in ingredient：0.20%~0.30%, Mo：0.20%~0.30%
Etc. more noble element.
In addition, document《It is heat-treated the research influenced on X80 pipe line steels structure property》、《Different Tempering and Quenching X80 steel are thick
The organization and performance of plate》Involved steel plate is mainly used for making bend pipe and pipe fitting, stresses to introduce heat treatment process and tissue, property
The relationship of energy, and have notable difference with the present invention in ingredient and process aspect.
Invention content
A kind of marine natural air-flotation type LNG project pipelines are provided it is an object of the invention to overcome the above problem and deficiency
With the good X70Q hot-rolled thick planks of toughness and its production method, technique is flexible, convenient to carry out, the remnants of the hot-rolled thick plank produced
Stress is small, and structural banding and component segregation are low, and heterogeneous microstructure and performance are stablized under service condition, and safety, durability are more
To be excellent, steel plate meets floating LNG engine requests.
What the object of the invention was realized in：
A kind of floating LNG pipelines X70Q hot-rolled thick planks, which is characterized in that the ingredient of the steel plate is by weight percentage such as
Under：C：0.040%~0.075%, Si：0.16%~0.29%, Mn：1.50%~1.75%, P≤0.015%, S≤
0.002%th, Nb：0.03%~0.05%, Ti：0.021%~0.039%, V：0.07%~0.09%, Als：0.021%~
0.039%, N：0.003%~0.006%, Ti/N：3.42~6.95, Mo：0~0.14%, Ni：0.10%~0.19%, Cu：
0.10%~0.19%, Cr ＜ 0.15%, (Mo+Ni+Cu)：0.25%~0.40%, surplus is iron and inevitable impurity；
The CE of the floating LNG pipelines X70Q hot-rolled thick planksIIWControl is in 0.37%~0.41%, CEPcmControl 0.16%~
0.19%, wherein CEIIW=C+Mn/6+ (Ni+Cu)/15+ (Cr+Mo+V)/5, CEPcm=C+Si/30+ (Mn+Cu+Cr)/20+
Ni/60+Mo/15+V/10+5B。
Present component designs reason：
C is effective intensified element the most cheap, can improve quenching degree, play solution strengthening and precipitation enhancement,
Therefore, carbon content is unsuitable too low；But the increase of carbon content is unfavorable to toughness of material and weldability, present invention setting carbon control
Ranging from 0.04%~0.075%.
Si can play invigoration effect, but its too high levels can reduce the plasticity of steel and toughness, for the purpose of the present invention,
Optimum range is 0.16%~0.29%.
Mn can play solution strengthening effect, moreover it is possible to increase stabilization of austenite, it is also advantageous to improving quenching degree, still,
Manganese content it is excessively high it is easy induce segregation, deteriorate toughness and corrosion resistance, therefore it is considered herein that by the control of Mn contents 1.50%~
1.75% is more suitable.
Nb, V, Ti can inhibit Austenite Grain Growth in heating process, refine phase-change organization；Simultaneously can also be formed C,
N compounds precipitate, and play the role of precipitation strength.The present invention takes full advantage of the fine grain of Nb, Ti, V and precipitation strength effect, makes steel plate
There is good comprehensive performance after heat treatment；But on the one hand its too high levels can cause cost of alloy to increase, on the other hand right
Weldability generates harmful effect, therefore, present invention control Nb：0.03%~0.05%, Ti：0.021%~0.039%, V：
0.07%~0.09%.
Al is effective deoxidant element, but the excessively high field trash that can make in steel of Al content increases, and influences weldability, therefore,
The content control of Als is advisable 0.021%~0.039%.
N can be combined the precipitate to form higher melt with Ti, Nb, crystal grain when being heat-treated to inhibition heating of plate blank and steel plate
It grows up and plays obvious effect, it is therefore, advantageous to performance there are certain N in steel, but too high levels can deteriorate base material and sweating heat
The toughness of the zone of influence, content control are advisable 0.003%~0.006%；Ti/N：3.42~6.95 can effectively control steel middle reaches
From N content, the advantageous effect of N is given full play to.
Mo can significantly improve stabilization of austenite and quenching degree, increase steel plate thickness direction cooling uniformity, in promotion
Low-temperature transformation organizes the formation of, and still, molybdenum content is excessively high not only to increase cost, and also material weldability is adversely affected, therefore,
It is 0~0.14% that its content, which should be controlled,.
Ni, Cu can play solution strengthening effect, be among the austenite stabilizing elements, can improve quenching degree, additionally it is possible to improve
The corrosion resistance of steel；But Ni higher prices, Cu too high levels can deteriorate toughness, and therefore, the present invention exists the control of Ni contents
0.10%~0.19%, the control of Cu contents is 0.10%~0.19%.
Cr has very strong solution strengthening effect, can also effectively improve structure stability, but Cr too high levels can influence to weld
Connecing property and toughness, so, Cr contents are no more than 0.15% and are advisable.
The CE of the present inventionIIWControl is in 0.37%~0.41%, CEPcmControl can ensure steel plate 0.16%~0.19%
With suitable solderability and corrosion resistance while obtaining high intensity, high tenacity.
A kind of production method of floating LNG pipelines X70Q hot-rolled thick planks, including smelting, external refining, continuous casting, rolling,
Cooling and heating treatment,
Refining process must carry out vacuum outgas, Ca and micro- Ti processing, control (O+N+H)≤80ppm, effectively reduce in steel
Harmful element content simultaneously controls field trash composition and form；
Continuous casting billet heats after cleaning, and 1160~1200 DEG C of blank heating temperature, heating process is divided into preheating section, bringing-up section
And soaking zone, total 1.2~1.6min/mm of heating time, wherein, the soaking zone time is no less than 30min.Heat stepwise mode is advantageous
In reducing continuous casting billet surface and the mid-depth temperature difference, improve structural homogenity, reduce heating defect；Heating temperature and soaking time
Control can ensure that alloying element is fully dissolved, promote ingredient and equalizing temperature, meanwhile, effectively control austenite grain ruler
It is very little, good obdurability matching can be obtained for final steel plate, DWTT performances is improved and lays the foundation.
Roughing is rolled using transverse and longitudinal, 1010~1120 DEG C of roughing temperature, every time deflection >=12%, adds up deflection
>=54%, 770~860 DEG C of final rolling temperature adds up deflection 61%~73%.Rough rolling step can be with to the control of pass deformation
Austenite is made fully to recrystallize；Accumulative drafts can ensure whole grain refining effect；The guarantee of finish rolling stage is enough to tire out
Product deflection makes austenite fully deformed, increases nucleation site；Rolling sequence is to the control of deformation temperature and the guarantee of deflection
Austenite grain is made fully to refine, while the refinement of formation tissue after cooling can be promoted, to improving big wall thickness pipe line steel
DWTT performances play beneficial effect.
Roller repairing and heat treatment are using press quenching+tempering or the quenched two kinds of techniques of ACC+.
750~790 DEG C of acceleration the beginning of cooling temperature after being rolled using steel plate during press quenching+tempering process, cooling velocity >=
15 DEG C/s, final cooling temperature≤350 DEG C；During tempering, 450~520 DEG C of temperature keeps the temperature 1.0~3.0min/mm.
720~770 DEG C of acceleration the beginning of cooling temperature after being rolled using steel plate during ACC+ hardening and tempering process, 8~18 DEG C of cooling velocity/
S, 400~520 DEG C of final cooling temperature, later stacking slow cooling, 0.2~1.0 DEG C/s of slow cooling cooling rate；When quenched, hardening heat 870 is controlled
~930 DEG C, 1.0~1.4min/mm is kept the temperature, cooling velocity >=20 DEG C/s obtain fine grain, super saturated solid solution tissue；Temperature
470~560 DEG C, 1.5~4.0min/mm of soaking time.
The roller repairing and heat treatment process of the present invention promotes the precipitation strength of alloying element and the diffusion of interstitial element,
Yield strength is improved, residual stress is reduced, effectively controls yield tensile ratio, makes that steel plate structure property is stable, internal stress is low；Together
When, control in tissue that ferrite percentage is 25%~60%, average grain size is no more than 13 μm, suitable ferrite
Ratio and tiny crystallite dimension can be effectively improved the toughness of material, ensure low temperature DWTT performances, successfully solve think gauge
The problem of pipe line steel DWTT Properties Controls, so as to which steel plate be made to obtain good comprehensive performance.
The beneficial effects of the present invention are：
(1) based on C, Mn, the fine grain and precipitation that make full use of Nb, Ti, V improve steel plate for present component design
Performance, and it is allowed to have given play to reinforcing, toughening and corrosion-resistant by adding in Cu, Ni element in steel and being equipped with corresponding production technology
Property effect, effectively improve comprehensive performance, steel plate made to meet floating LNG engine requests.
(2) CE of the present inventionIIWAnd CEPcmIt is suitable, ensure that material has good solderability.
(3) press quenching+tempering or the quenched two schemes of ACC+, technique spirit can be used in roller repairing of the present invention and heat treatment
It is living, it is convenient to carry out.
(4) residual stress of hot-rolled thick plank of the present invention is small, and structural banding and component segregation are low, microcosmic under service condition
Institutional framework and performance are stablized, and safety, durability are more excellent.
(5) thickness specification >=31mm of floating LNG pipelines X70Q hot-rolled thick planks of the present invention, transverse yield strength can
Reach 520-580MPa, transverse tensile strength reaches 600-680MPa, and yield tensile ratio is no more than 0.90, and -30 DEG C of side knock work(are not
Less than 380J, -20 DEG C of transverse direction DWTT sections of shear are not less than 85%, the corrosion examination in 96 hours in the B solution of NACE-0284 standards
It tests result and meets technology requirement, be suitable as the raw material of manufacture floating LNG pipelines.
Description of the drawings
Fig. 1 is 2 microscopic structure metallograph of the embodiment of the present invention.
Fig. 2 is 5 microscopic structure metallograph of the embodiment of the present invention.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention according to the component proportion of technical solution, smelted, external refining, continuous casting, rolling, cooling and
Heat treatment.The chemical composition of steel of the embodiment of the present invention is shown in Table 1.The main rolling technological parameter of steel of the embodiment of the present invention is shown in Table 2.This
The main cooling technique parameter of inventive embodiments steel is shown in Table 3.The main heat treatment process parameter of steel of the embodiment of the present invention is shown in Table 4.
Performance is shown in Table 5 after steel heat treatment of the embodiment of the present invention.Steel hot-rolled thick plank hic resistance inspection result of the embodiment of the present invention is shown in Table 6.
The chemical composition wt% of 1 steel of the embodiment of the present invention of table
The main rolling technological parameter of 2 steel of the embodiment of the present invention of table
The main cooling technique parameter of 3 steel of the embodiment of the present invention of table
The main heat treatment process parameter of 4 steel of the embodiment of the present invention of table
Performance after 5 steel heat treatment of the embodiment of the present invention of table
Note：Tensile sample justifies tensile sample for φ 12.7mm.
6 steel hot-rolled thick plank hic resistance inspection result of the embodiment of the present invention of table
| Embodiment | CLR, % | CTR, % | CSR, % | Check conclusion |
| 1 | 0 | 0 | 0 | It is qualified |
| 2 | 0 | 0 | 0 | It is qualified |
| 3 | 0 | 0 | 0 | It is qualified |
| 4 | 0 | 0 | 0 | It is qualified |
| 5 | 0 | 0 | 0 | It is qualified |
| 6 | 0 | 0 | 0 | It is qualified |
Note：Testing liquid be NACE B solutions, etching time 96 hours.
Claims (1)
1. a kind of production method of floating LNG pipelines X70Q hot-rolled thick planks, which is characterized in that steel plate thickness >=31mm, the steel
The ingredient of plate is as follows by weight percentage：C：0.040%~0.075%, Si：0.16%~0.29%, Mn：1.50%~
1.75%th, P≤0.015%, S≤0.002%, Nb：0.03%~0.05%, Ti：0.021%~0.039%, V：0.07%~
0.09%th, Als：0.021%~0.039%, N：0.003%~0.006%, Ti/N：3.42~6.95, Mo：0~0.14%,
Ni：0.10%~0.19%, Cu：0.10%~0.19%, Cr ＜ 0.15%, (Mo+Ni+Cu)：0.25%~0.40%, surplus
For iron and inevitable impurity；The CE of the floating LNG pipelines X70Q hot-rolled thick planksIIWControl 0.37%~0.41%,
CEPcmIt controls 0.16%~0.19%, wherein
CEIIW=C+Mn/6+ (Ni+Cu)/15+ (Cr+Mo+V)/5,
CEPcm=C+Si/30+ (Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B；
The production method of the floating LNG pipelines X70Q hot-rolled thick planks, including smelting, external refining, continuous casting, rolling, cooling
And heat treatment,
Refining process must carry out vacuum outgas, Ca and micro- Ti processing, control (O+N+H)≤80ppm；
Continuous casting billet heats after cleaning, 1160~1200 DEG C of blank heating temperature, heating process be divided into preheating section, bringing-up section and
Hot arc, total 1.2~1.6min/mm of heating time, wherein, the soaking zone time is no less than 30min；
Roughing is rolled using transverse and longitudinal, 1010~1120 DEG C of roughing temperature, every time deflection >=12%, and accumulative deflection >=
54%, 770~860 DEG C of final rolling temperature adds up deflection 61%~73%；
Roller repairing and heat treatment are using press quenching+tempering or the quenched two kinds of techniques of ACC+；
Press quenching+the tempering process is that steel plate accelerates 750~790 DEG C of the beginning of cooling temperature, cooling velocity >=15 after rolling
DEG C/s, final cooling temperature≤350 DEG C；During tempering, 450~520 DEG C of temperature keeps the temperature 1.0~3.0min/mm；
The ACC+ hardening and tempering process is that steel plate accelerates 720~770 DEG C, 8~18 DEG C/s of cooling velocity of the beginning of cooling temperature after rolling,
400~520 DEG C of final cooling temperature, later stacking slow cooling, 0.2~1.0 DEG C/s of slow cooling cooling rate；When quenched, control hardening heat 870~
930 DEG C, 1.0~1.4min/mm of heat preservation, cooling velocity >=20 DEG C/s, 470~560 DEG C of temperature, soaking time 1.5~
4.0min/mm。
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| CN109957709B (en) * | 2017-12-14 | 2020-07-17 | 鞍钢股份有限公司 | V-containing large-deformation X70M pipeline steel plate and manufacturing method thereof |
| CN109055865B (en) * | 2018-10-08 | 2020-02-18 | 鞍钢股份有限公司 | Steel for riser with excellent corrosion resistance and manufacturing method thereof |
| CN109628832B (en) * | 2018-12-28 | 2021-01-15 | 首钢集团有限公司 | High-strength and high-toughness steel plate for pipe fittings serving in extremely low temperature environment and manufacturing method thereof |
| CN113005369B (en) * | 2021-02-26 | 2022-05-27 | 日钢营口中板有限公司 | Method for producing ultra-wide low-temperature X70M pipeline steel plate by adopting large spreading ratio mode |
| CN115323261B (en) * | 2021-05-11 | 2023-08-11 | 宝山钢铁股份有限公司 | Steel plate for quenched and tempered acid-resistant pipeline and manufacturing method thereof |
| CN114875311B (en) * | 2022-04-26 | 2023-05-26 | 湖南华菱湘潭钢铁有限公司 | Large-thickness 420 MPa-level low-yield-ratio steel for ocean engineering and production method thereof |
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| CN102021499B (en) * | 2009-09-22 | 2013-02-06 | 宝山钢铁股份有限公司 | Method for manufacturing high-strength pipe steel |
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| CN101215624A (en) * | 2008-01-08 | 2008-07-09 | 济南钢铁股份有限公司 | On-line quenching production technique for high toughness thick steel plate |
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