CN109881114A - A kind of heavy caliber thick wall low temperature seamless line pipe and its manufacturing method - Google Patents
A kind of heavy caliber thick wall low temperature seamless line pipe and its manufacturing method Download PDFInfo
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Abstract
The invention discloses a kind of heavy caliber thick wall low temperature seamless line pipes, including following mass percentage: C≤0.18%；Si 0.25~0.40%；Mn 0.10~1.5%；P≤0.020%；S≤0.010%；Nb+V+Ti≤0.10%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%, its manufacturing method is also disclosed.Seamless line pipe of the invention is readily produced, at low cost, and steel pipe intensity with higher, excellent low-temperature impact toughness and high dimensional accuracy.
Description
Technical field
The present invention relates to metallurgical material field more particularly to a kind of heavy caliber thick wall low temperature seamless line pipe and its manufactures
Method.
Background technique
It is existing in the world as the pipeline transportation of one of five big means of transportation (railway, highway, water transport, aviation and pipeline)
More than 100 years history, because its have the characteristics that it is economical, safe and efficient, uninterrupted, pollution-free, in addition to be largely used to over long distances it is defeated
It send petroleum, outside natural gas, is alternatively arranged as the significant transportation means of coal and other solid materials, is the energy such as petroleum, natural gas, coal
Source medium most convenient, economic means of transportation.So far the crude pipeline transportation amount of sending of developed country accounts for the 80% of its total conveying capacity, remaining
Mainly by waterway transportation, railway transportation accounts for seldom a part, and product oil long-distance transportation also achieves pipeline, natural gas substantially
Pipe throughput rate is up to 95%.So far, whole world oil-gas pipeline main line length is more than 200 × 104km, and wherein production trunk line accounts for about
30%.The U.S. and Russia are the world's largest Crude oil consumption states, be completed oil-gas pipeline length account for respectively No. 1 in the world and
Second accounts for the 60% of world's oil-gas pipeline total length.
Nearly ten years, great-leap-forward development is presented for giving pipe-line construction in China's oil gas.2015, domestic oil-gas pipeline overall length
Reach 140,000 kilometers.In addition to applying in chemical industry, petroleum industry, line pipe is also widely used in the warm of integrated mill
Gas conveying and water system.In urban construction, line pipe is provided used also as the transport agent of coal gas and natural gas for city
Clean and environmental protection, energy-efficient new energy.Simultaneously with industrial gas oil continuous development, the exploitation of petroleum resources also by
High and cold region is gradually turned to, Xinjiang of China oil field and Daqing oil field multi-purpose station pipeline winter minimum temperature are -34 DEG C or lower, this will
It asks steel pipe both to need high intensity, should also there is excellent low-temperature flexibility.
In recent years, with the rapid development that oil-gas pipeline and urban weather hot pipe network are built, line pipe production is able to fast
Speed development, wherein common grade of steel of the X52 level pipeline pipeline pipe as pipeline engineering, especially branch line engineering, demand is huge, together
When due to carbon equivalent limitation, X52 large-sized heavy-wall tube production difficulty is very big.
Summary of the invention
The object of the present invention is to provide a kind of heavy caliber thick wall low temperature seamless line pipe and its manufacturing method, the heavy calibers
Heavy wall low temperature seamless line pipe X52N not only solves the insufficient defect of large-sized heavy-wall tube intensity, is readily produced, cost
It is low, and there is superior low-temperature toughness, meet the requirement of worst cold case, brings biggish economic benefit and society for enterprise
It can benefit.It can be used as delivery pipe, be widely used in extremely frigid zones, have the characteristics that easy to produce, inexpensive, function admirable.
In order to solve the above technical problems, the present invention adopts the following technical scheme:
A kind of heavy caliber thick wall low temperature seamless line pipe, including following mass percentage: C≤0.18%；Si 0.25
~0.40%；Mn 0.10~1.5%；P≤0.020%；S≤0.010%；Nb+V+Ti≤0.10%；Remaining is Fe and can not
The impurity avoided, mass fraction amount to 100%.
Further, including following mass percentage: C:0.16%；Si:0.34%；Mn:1.29%；P:0.016%；
S:0.007%；Nb:0.026%；V:0.024%；Ti:0.014%；Remaining is that Fe and inevitable impurity, mass fraction are total
It is calculated as 100%.
Further, including following mass percentage: C:0.15%；Si:0.34%；Mn:1.30%；P:0.015%；
S:0.007%；Nb:0.026%；V:0.024%；Ti:0.013%；Remaining is that Fe and inevitable impurity, mass fraction are total
It is calculated as 100%.
Further, including following mass percentage: C:0.17%；Si:0.36%；Mn:1.36%；P:0.017%；
S:0.008%；Nb:0.030%；V:0.026%；Ti:0.014%；Remaining is that Fe and inevitable impurity, mass fraction are total
It is calculated as 100%.
Further, including following mass percentage: C:0.16%；Si:0.31%；Mn:1.40%；P:0.012%；
S:0.003%；Nb:0.024%；V:0.026%；Ti:0.013%；Remaining is that Fe and inevitable impurity, mass fraction are total
It is calculated as 100%.
Further, including following mass percentage: C:0.15%；Si:0.32%；Mn:1.35%；P:0.013%；
S:0.004%；Nb:0.027%；V:0.026%；Ti:0.015%；Remaining is that Fe and inevitable impurity, mass fraction are total
It is calculated as 100%.
A kind of manufacturing method of heavy caliber thick wall low temperature seamless line pipe, including such as:
Steel-smelting production process are as follows: molten iron pretreatment → converter smelting → LF refining → VD degassing → round billet continuous casting；Supplied materials iron
Water carries out molten iron pretreatment, to guarantee the molten steel quality of supply converter；To inhibit gas content in material, silicomanganese, manganese iron, niobium
Iron, vanadium iron and ferrotianium carry out deoxidation alloying before addition；Converter terminal controls target: C >=0.06%, P≤0.015%；
It is smelted using single slag technique, finishing slag basicity >=3.0；Pushing off the slag when tapping, pushing off the slag failure are then skimmed；In LF refining link, according to
Converter molten steel ingredient and temperature progress slag making desulfurization, composition adjustment and warming temperature, VD depth vacuum degree target value≤0.06Kpa,
Deep vacuum time >=15 minute after VD, feed appropriate silicon-calcium wire, and soft blow Ar is not less than 15 minutes after feeding silk, to guarantee material
Lower gas content in material；Continuous casting process uses electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C, according to different round billets
Section selection suitable pulling rate perseverance pulling rate production, round billet should enter burial pit and carry out slow cooling, enter to cheat temperature greater than 600 DEG C, when slow cooling
Between be not less than 48 hours；
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling；Annular furnace is protected
Temperature section temperature is 1200-1300 DEG C, and temperature is 1200-1250 DEG C after round billet perforation；Tandem rolling inlet temperature is 1000-1200 DEG C；
Temperature is 900-960 DEG C after sizing；High-end controlling hot rolling technology is combined to obtain size by three roller retained-mandrel MPM group PQF
High-quality tube body with high accuracy；
Heat treatment process are as follows: use normalized treatment, normalizing temperature is 890 DEG C~910 DEG C, 30-80 minutes is kept the temperature, after normalizing
Sizing straightening temperature is not less than 500 DEG C.
Further, round billet heats in annular furnace, and furnace temperature is 1270 DEG C, heating of pipe blank temperature deviation ± 10 DEG C, in furnace
Time is unsuitable too long, and perforation is bitten using low speed, the technique of high-speed rolling, and wearing rear temperature is 1220 DEG C, and entering tandem mill temperature is
1100 DEG C, temperature is 940 DEG C after sizing, cooling, sawing.
Further, it uses the normalizing temperature of normalized treatment for 900 DEG C, keeps the temperature 60 minutes, sizing straightening temperature after normalizing
Not less than 500 DEG C, and detect a flaw.
Carbon (C): as intensified element most economical, most basic in steel, by solution strengthening and precipitation strength to raising steel
Intensity have obvious effect, but excessively high carbon content adversely affects the extension of steel, toughness and weldability, while it is easier that
Alloying element carbide is precipitated in crystal boundary, declines so as to cause the decline of steel grade corrosion resistance, especially sulfur resistance, the present invention
Control appropriate is carried out to carbon content and improves the toughness and solderability of steel, for purposes of the invention, C while ensureing intensity
Content≤0.18%.
Manganese (Mn): Mn can greatly improve the intensity and toughness of steel grade by solution strengthening, be that compensation is drawn because C content reduces
The main and most economical intensified element and effective deoxidier of loss of strength are played, and has the function of de- S, still
Excessively high Mn can promote the formation of carbide, to reduce the toughness and corrosion resistance of steel grade；Mn can be infinitely mutual with γ-Fe
It is molten, the area γ is expanded, increases the harden ability of steel, but excessively high Mn has the tendency that increasing austenite grows up, and easily makes coarse grains, makes
Steel has superheated susceptivity and temper brittleness, while reducing the welding performance of steel.Therefore, for purposes of the invention, Mn content range is
0.10~1.5%.
Niobium, vanadium, titanium (Nb, V, Ti): there is strong binding ability to form respective carbide, nitridation by Nb, V, Ti and C, N
Object or carbonitride have strong refinement crystal grain and precipitation strength effect, greatly improve the mechanical property of steel grade.Nb is in steel
Feature is exactly to improve the recrystallization temperature of austenite, to achieve the purpose that fining austenite grains, micro Nb can make steel completely
Fabulous comprehensive performance is obtained, Nb too high levels cause steel to be easy to appear mixed crystal；Ti's forms small stable in continuous-casting of steel billet
Precipitated phase, this precipitated phase can effectively hinder Austenite Grain Growth when heated, help to improve Nb in austenite
Solid solubility, while there is obvious effect to the impact flexibility for improving welding heat affected zone.But when the content of Nb, V, Ti are more than
When 0.1%, precipitated phase particle can be made coarse, and oxide is mingled with and is increased, had an adverse effect instead, reduce simultaneously
The welding performance of steel grade.Therefore, Nb+V+Ti≤0.10% in the present invention.
Compared with prior art, advantageous effects of the invention:
The reasonable selection of seamless steel pipe microalloy element of the invention, appropriate constituent content proportion, make steel grade have compared with
Low carbon equivalent, and be readily produced, it is at low cost；Make steel by reasonably smelting continuous casting process, rolling mill practice and heat treatment process
Manage intensity, excellent low-temperature impact toughness and high dimensional accuracy with higher；The steel pipe can be used as delivery pipe, be widely applied
In extremely frigid zones, has the characteristics that easy to produce, inexpensive, function admirable.
Specific embodiment
By the steel pipe tubing that the present invention obtains, by taking 457 × 20mm of production specification Φ as an example, chemical component such as table 1:
The steel pipe chemical component statistical result wt% of the present invention of table 1
| Example | C | Si | Mn | P | S | Nb | V | Ti |
| 1 | 0.16 | 0.34 | 1.29 | 0.016 | 0.007 | 0.026 | 0.024 | 0.014 |
| 2 | 0.15 | 0.34 | 1.30 | 0.015 | 0.007 | 0.026 | 0.024 | 0.013 |
| 3 | 0.17 | 0.36 | 1.36 | 0.017 | 0.008 | 0.030 | 0.026 | 0.014 |
| 4 | 0.16 | 0.31 | 1.40 | 0.012 | 0.003 | 0.024 | 0.026 | 0.013 |
| 5 | 0.15 | 0.32 | 1.35 | 0.013 | 0.004 | 0.027 | 0.026 | 0.015 |
Steel pipe chemical component fully meets requirement of the present invention to steel grade, P and S content is lower, meets ingredient design requirement,
And each furnace component content deviation very little, stable component content are conducive to carry out temperature control when heat treatment as can be seen from Table 1
System, to have good tissue and performance to provide precondition for tubing.
Process for making: the steel pipe of 457 × 20mm of production specification Φ uses continuous cast round billets section for Φ 430mm, Baogang's steel pipe
Company's fan-shaped sections of steelmaking continuous casting machines arc radius is 12m.In order to overcome small arc radius production big cross section round billet to be easy to produce round billet table
The problem of face micro-crack, especially takes a series of measures to the steel grade of crack-sensitivity containing microalloy elements such as Nb, V, Ti,
Such as Nb, V, Ti content appropriate and proportion；Continuous casting stablizes pulling rate, guarantees that continuous casting billet crosses straightening section temperature not less than 900 DEG C；Using
Weak and uniform secondary cooling system；Suitable covering slag is selected, casting machine centering, arc aligning accuracy are improved；After slab is offline, round billet enters
Burial pit slow cooling enters to cheat temperature greater than 600 DEG C, to eliminate structural stress and thermal stress.By the above measure, high quality has been obtained
Round billet.
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling.Round billet is in ring
Heating in shape furnace, furnace temperature are 1270 DEG C, and heating of pipe blank temperature deviation ± 10 DEG C, time inside furnace is unsuitable too long, and perforation uses low speed
It bites, the technique of high-speed rolling, wearing rear temperature is 1220 DEG C, and entering tandem mill temperature is 1100 DEG C, and temperature is 940 DEG C after sizing,
It is cooling, sawing.
Heat treatment: using normalized treatment normalizing temperature for 900 DEG C, keeps the temperature 60 minutes or so, sizing straightening temperature after normalizing
Not less than 500 DEG C, and detect a flaw.
Line pipe geometric dimension of the invention:
Tube end diameter range: 454.72~459.29 (- 0.5%D~+0.5%D)
Wall thickness range: 20.24~22.20 (- 8%t~+10%t)
Out-of-roundness: entirety≤1%OD
Straight degree: it is whole≤0.15%, away from pipe end 1000mm, tip bend≤3.0mm.
Line pipe dimensional accuracy of the invention is high, the weld job being easy between steel pipe.
Mechanical properties of pipe of the invention is as shown in table 2.As seen from Table 2, method of the invention is well positioned to meet big mouth
The requirement of diameter thick-wall seamless spool X52N, the steel strength of 457 × 20mm of specification Φ reach X52 grade of steel, yield tensile ratio very little, tool
There is excellent low-temperature impact toughness, -45 DEG C of side knocks are greater than 80J, and hardness number is also very low.
The mechanical properties of pipe of the present invention of table 2
The field trash and tissue grain size of steel pipe of the invention are as shown in table 3.
The steel pipe of the present invention of table 3 and sundries and tissue grain size
Note: F indicates that ferrite, P indicate pearlite
Reach X52 grade of steel using the steel strength of 457 × 20mm of specification Φ produced by the invention, microalloy element it is reasonable
Selection, appropriate constituent content proportion, makes steel grade have lower carbon equivalent, is easy to weld, while solving heavy caliber thick wall
The insufficient problem of pipe intensity, and be readily produced, at low cost, reasonably smelting continuous casting process, rolling mill practice and heat treatment process makes
Steel pipe intensity with higher, excellent low-temperature impact toughness and high dimensional accuracy.It can be used as delivery pipe, be widely used in height
Cold area, has the characteristics that easy to produce, inexpensive, function admirable.
Embodiment described above is only that preferred embodiment of the invention is described, and is not carried out to the scope of the present invention
It limits, without departing from the spirit of the design of the present invention, those of ordinary skill in the art make technical solution of the present invention
Various changes and improvements, should all fall into claims of the present invention determine protection scope in.
Claims (9)
1. a kind of heavy caliber thick wall low temperature seamless line pipe, it is characterised in that: including following mass percentage: C≤
0.18%；Si 0.25~0.40%；Mn 0.10~1.5%；P≤0.020%；S≤0.010%；Nb+V+Ti≤0.10%；
Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
2. heavy caliber thick wall low temperature seamless line pipe according to claim 1, it is characterised in that: including following quality hundred
Divide content: C:0.16%；Si:0.34%；Mn:1.29%；P:0.016%；S:0.007%；Nb:0.026%；V:0.024%；
Ti:0.014%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
3. heavy caliber thick wall low temperature seamless line pipe according to claim 1, it is characterised in that: including following quality hundred
Divide content: C:0.15%；Si:0.34%；Mn:1.30%；P:0.015%；S:0.007%；Nb:0.026%；V:0.024%；
Ti:0.013%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
4. heavy caliber thick wall low temperature seamless line pipe according to claim 1, it is characterised in that: including following quality hundred
Divide content: C:0.17%；Si:0.36%；Mn:1.36%；P:0.017%；S:0.008%；Nb:0.030%；V:0.026%；
Ti:0.014%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
5. heavy caliber thick wall low temperature seamless line pipe according to claim 1, it is characterised in that: including following quality hundred
Divide content: C:0.16%；Si:0.31%；Mn:1.40%；P:0.012%；S:0.003%；Nb:0.024%；V:0.026%；
Ti:0.013%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
6. heavy caliber thick wall low temperature seamless line pipe according to claim 1, it is characterised in that: including following quality hundred
Divide content: C:0.15%；Si:0.32%；Mn:1.35%；P:0.013%；S:0.004%；Nb:0.027%；V:0.026%；
Ti:0.015%；Remaining is that Fe and inevitable impurity, mass fraction amount to 100%.
7. the manufacturing method of heavy caliber thick wall low temperature seamless line pipe described in -6 any one according to claim 1, special
Sign is, including such as:
Steel-smelting production process are as follows: molten iron pretreatment → converter smelting → LF refining → VD degassing → round billet continuous casting；Supplied materials molten iron into
Row molten iron pretreatment, to guarantee the molten steel quality of supply converter；For inhibit material in gas content, silicomanganese, manganese iron, ferro-niobium,
Vanadium iron and ferrotianium carry out deoxidation alloying before addition；Converter terminal controls target: C >=0.06%, P≤0.015%；Using
Single slag technique is smelted, finishing slag basicity >=3.0；Pushing off the slag when tapping, pushing off the slag failure are then skimmed；In LF refining link, according to converter
Molten steel composition and temperature carry out slag making desulfurization, composition adjustment and warming temperature, and VD depth vacuum degree target value≤0.06Kpa is deep true
Empty time >=15 minute after VD, feed appropriate silicon-calcium wire, and soft blow Ar is not less than 15 minutes after feeding silk, to guarantee in material
Lower gas content；Continuous casting process uses electromagnetic agitation technique, molten steel overheat Δ T≤30 DEG C, according to different round billet sections
Suitable pulling rate perseverance pulling rate is selected to produce, round billet should enter burial pit and carry out slow cooling, enter to cheat temperature greater than 600 DEG C, slow cooling time is not
Less than 48 hours；
Tube-rolling technique are as follows: round billet → sawing → annular stove heating → perforation → PQF tandem rolling → sizing → cooling；Annular furnace soaking zone
Temperature is 1200-1300 DEG C, and temperature is 1200-1250 DEG C after round billet perforation；Tandem rolling inlet temperature is 1000-1200 DEG C；Sizing
Temperature is 900-960 DEG C afterwards；High-end controlling hot rolling technology is combined to obtain dimensional accuracy by three roller retained-mandrel MPM group PQF
High high-quality tube body；
Heat treatment process are as follows: use normalized treatment, normalizing temperature is 890 DEG C~910 DEG C, keeps the temperature 30-80 minutes, sizing after normalizing
Straightening temperature is not less than 500 DEG C.
8. manufacturing method according to claim 7, it is characterised in that: round billet heats in annular furnace, and furnace temperature is 1270 DEG C,
Heating of pipe blank temperature deviation ± 10 DEG C, time inside furnace is unsuitable too long, and perforation is bitten using low speed, the technique of high-speed rolling, after wearing
Temperature is 1220 DEG C, and entering tandem mill temperature is 1100 DEG C, and temperature is 940 DEG C after sizing, cooling, sawing.
9. manufacturing method according to claim 7, it is characterised in that: use the normalizing temperature of normalized treatment for 900 DEG C, protect
Temperature 60 minutes, sizing straightening temperature is not less than 500 DEG C after normalizing, and detects a flaw.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110846574A (en) * | 2019-11-07 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | Low-cost quenched and tempered X52-grade hydrogen sulfide corrosion-resistant seamless pipeline pipe and manufacturing method thereof |
| CN110846573A (en) * | 2019-11-07 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | Seamless steel tube for X80 conveying pipeline and manufacturing method thereof |
| CN115323286A (en) * | 2022-07-12 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed Q345 qDNH-grade weather-proof seamless steel tube for bridge and manufacturing method thereof |
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| CN105088093A (en) * | 2015-07-23 | 2015-11-25 | 天津钢管集团股份有限公司 | Low-temperature, low-yield-ratio and S355 steel grade type seamless structural steel tube and production method |
| CN106929774A (en) * | 2017-03-14 | 2017-07-07 | 达力普石油专用管有限公司 | A kind of normalizing state X52 sulfur resistive seamless line pipes and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105088093A (en) * | 2015-07-23 | 2015-11-25 | 天津钢管集团股份有限公司 | Low-temperature, low-yield-ratio and S355 steel grade type seamless structural steel tube and production method |
| CN106929774A (en) * | 2017-03-14 | 2017-07-07 | 达力普石油专用管有限公司 | A kind of normalizing state X52 sulfur resistive seamless line pipes and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110846574A (en) * | 2019-11-07 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | Low-cost quenched and tempered X52-grade hydrogen sulfide corrosion-resistant seamless pipeline pipe and manufacturing method thereof |
| CN110846573A (en) * | 2019-11-07 | 2020-02-28 | 包头钢铁（集团）有限责任公司 | Seamless steel tube for X80 conveying pipeline and manufacturing method thereof |
| CN115323286A (en) * | 2022-07-12 | 2022-11-11 | 包头钢铁（集团）有限责任公司 | Rare earth microalloyed Q345 qDNH-grade weather-proof seamless steel tube for bridge and manufacturing method thereof |
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