CN102615476A - X70-level large-aperture thick-wall seamless pipe for deep sea and manufacturing method of pipe - Google Patents
X70-level large-aperture thick-wall seamless pipe for deep sea and manufacturing method of pipe Download PDFInfo
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Abstract
The invention relates to high-strength and high-toughness X70-level large-aperture thick-wall conveying pipeline steel and production method thereof. The production steps includes: pouring externally refined alloy liquid steel onto X70-level pipeline steel, leading the X70-level pipeline steel to enter a centrifugal casting machine, and casting the X70-level pipeline steel into a hollow pipe blank; machining, heating and dephosphorizing inner and outer surfaces of the hollow pipe blank; inserting a core rod in the hollow pipe blank, positioning, and feeding the pipe blank into a periodical pipe rolling machine via a feeding system to be repeatedly rolled so as to form required seamless steel; removing the core rod from the pipe and cutting the head and the tail of the pipe; and heating, sizing and finishing the pipe to obtain a qualified finished pipe. Ingredients and a process are simple, a high-strength and high-toughness X70-level large-aperture thick-wall seamless pipe for deep sea is manufactured, yield strength of the pipe is larger than or equal to 539MPa, tensile strength of the pipe is larger than or equal to 646MPa, a yield ratio of the pipe is smaller than or equal to 0.89, elongation is larger than or equal to 45%, and the charpy V-shaped transverse full-size impact energy at the temperature of minus 35 DEG C is higher than or equal to 275J.
Description
Technical field
The invention belongs to the seamless steel pipe manufacturing technology of metallurgical industry, relate to a kind of have high strength, high tenacity, the seamless pipe line steel of corrosion resistant heavy caliber thick wall X70 and manufacturing approach thereof.
Technical background
Carry cost for reducing, improve oil, natural gas transport efficient, its conveyance conduit is rapidly to big caliber, and medium is to high pressure, high density developer conveying direction.Simultaneously, with the progressively exhaustion of landing field petroleum resources, new resource exploitation extends to the abominable area of geological conditions such as ocean, polar region.Abominable marine environment has proposed than terrestrial pipeline with the strict more performance requirement of steel with steel submerged pipeline, and submerged pipeline not only requires the transverse strength of steel pipe, also requires the longitudinal strength of steel pipe.The routed property of the resistance to compression of submerged pipeline is more and more important.Become increasingly complex with operating mode along with the well depth of offshore mining oil gas is more and more darker, the demand of specification and thick-wall pipeline just progressively increases greatly.In order to make farther darker oil gas be transported to seashore; Corresponding pipeline requires length longer bigger with wall thickness, so pipeline not only requires good welding performance, high intensity and high impact flexibility; High pressure resistant, corrosion resistance also need high anti-low temperature and anti-squeezing to ruin performance.Reach high anti-squeezing and ruin the ability requirement; Improve through increasing grade of steel on the one hand, a kind of in addition mode improves wall thickness exactly and reaches, for pipeline; Improve the problem that grade of steel not only relates to the crackle expansion; Also relate to weldability can requirement, consider based on above factor, improve wall thickness and satisfy the deep-sea antagonism and squeeze and ruin the performance demands wise move of can yet be regarded as.Simultaneously, along with the increase of pipe line steel thickness, its low temperature arrest toughness becomes most critical, the maximum technical indicator of development difficulty.
At present; Pilger mill remains in order to one of main unit of producing heavy caliber, the high-end special-purpose tubing of heavy wall steel alloy; It adopts steel ingot or continuous casting billet; Through punching (reaming) with extend to obtain hollow bloom, and then carry out through pilger mill back and forth rolling, in order to the special-purpose seamless steel pipe of the steel alloy of making heavy caliber, heavy wall.Yet before getting into main transformer shape milling train, the process links of continuous casting billet pore-forming is more, the equipment tonnage is big, energy consumption is also big; The evenness of wall thickness of production tube depends on the precision of punching, reaming base and the accuracy that operates with the supporting feeding machine of main transformer shape milling train; Though the reciprocal rolling deformation characteristics that has forging on the pilger mill, but still can not overcome defectives such as hollow bloom self dimensional accuracy, surface quality be relatively poor.
Number of patent application is 200810151232 Chinese invention patent " high-strength high-ductility X 70 thick-wall seamless pipeline steel mechanism making method "; Set forth and adopted seamless steel pipe to carry the method for land or sea-bottom oil-gas; Adopt modulation treatment; Because the restriction of the carbon equivalent of pipe line steel, but to satisfy high grade of steel, good welding performance great difficulty.
Number of patent application is 200710052601 Chinese invention patent " a kind of steel plate and manufacturing approach thereof that is used to make submerged pipeline " and article " submerged pipeline is with the Application and Development of steel " (welded tube .2006; 29 (5): 36-39) set forth the method that adopts hot continuous rolling opening plate making submerged pipeline steel plate; The mode of production of the hot continuous rolling opening plate that it adopted can only be produced thickness
the neritic area submerged pipeline that 20mm is thick and used steel plate; Can not be used to produce thick specification and understand that the deep-sea uses the submerged pipeline steel; And need open behind the hot continuous rolling flat, cut, production process is longer.
Based on above deficiency and carry high pressure, high density, the long distances demand of corrosion resistant medium; This patent has been invented the seamless pipe line steel of a kind of high grade of steel of high tough X70, and the method that adopts centrifugal casting to combine with pilger mill is made the heavy caliber thick wall seamless pipe.Overcome the inherent shortcoming of prior art, formed a kind of energy-conservation, high-quality, economic heavy caliber, the production technology of the high tough seamless pipe of heavy wall, be particularly useful for producing high tough, heavy caliber, heavy wall, unmanageable seamless steel pipe.
Summary of the invention
The object of the present invention is to provide deep-sea that a kind of ability satisfy to carry high pressure, high density, the long distances demand of corrosion resistant medium with heavy caliber or super-large diameter, heavy wall and be difficult for rupture failure, security reliability is strong, percentage elongation is high, processing forming is good high-intensity high-tenacity X70 feed-line steel and seamless pipe production method thereof, satisfy the needs of transportation deep-sea oil natural gas.
Deep-sea of the present invention is with high-intensity high-tenacity X70 heavy caliber thick wall pipeline steel, and its key component and percentage by weight are: C:0.02 ~ 0.10, Si:0.04 ~ 0.40, Mn:1.0 ~ 1.80, P:0.002 ~ 0.014; S:0 ~ 0.002, N:0 ~ 0.08, Nb:0.02 ~ 0.08, Ti:0.005 ~ 0.03; Mo:0.05 ~ 0.40, Cu:0.05 ~ 0.30, V:0.02 ~ 0.12, Ni:0.05 ~ 0.35; Cr:0 ~ 0.30, Al:0.005 ~ 0.05, Ca:0.001 ~ 0.006, all the other are Fe.Simultaneously, also need satisfy carbon equivalent ce=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15≤0.43%.Welding cold cracking sensitivity coefficient Pcm=C+Si/20+Mn/20+Cu/20+Ni/60+Cr/20+ Mo/15+V/10+5B≤0.22.
The effect of each element and mechanism are following among the present invention:
The mentality of designing with low-carbon (LC), middle manganese, titanium micro-alloyedization of niobium is taked in the chemical composition design of X70 steel.Low carbon content can reduce the adverse effect of C element to toughness, and through alloying element Mn, Mo be used for suppress pro-eutectoid ferrite and change, guarantee to obtain acicular ferrite type tissue.Adopt Nb, Ti microalloying to improve recrystallization temperature, obtain to contain the tissue of more deformation bands, realize refined crystalline strengthening, dislocation strengthening and precipitation strength.
C: carbon is the essential element that influences pipe line steel obdurability, weldability.Add a certain amount of carbon, intensity that can significantly improve steel and the yield ratio that reduces steel, but when carbon content was increased to certain value, weldability worsened, and toughness descends, simultaneously, segregation aggravation, anti-hydrogen embrittlement corrosion (HIC) ability drop.Therefore, carbon content is defined as 0.02 ~ 0.10%.
Si: silicon mainly plays the solution strengthening effect, avoids simultaneously causing the moulding of steel, toughness significantly to worsen because of adding excess silicon, therefore, silicone content is defined as 0.04 ~ 0.40%.
Mn: manganese is the basic alloys element of pipeline with Aldecor, can significantly improve the intensity of steel, in addition; Manganese can be again crystal grain thinning to a certain extent; Improve the impact flexibility of steel, gather partially, cause the composition and the tissue odds of steel but excessive manganese is prone to formation; Therefore, manganese content is defined as 1.0 ~ 1.80%.
P, S, N: phosphorus brings segregation easily in pipe line steel, worsen welding performance, significantly reduce steel low-temperature impact toughness, improve adverse effect such as brittle transition temperature.Sulphur is to influence the anti-hydrogen embrittlement corrosion (HIC) of pipe line steel and the essential element of resisting sulfide stress corrosion (SSC) ability, influences low-temperature impact toughness.Nitrogen is prone to cause the quench aging and the strain ageing of steel, causes the unstable properties of steel.Therefore, should reduce the content of phosphorus in the steel, sulphur, nitrogen as far as possible.It is defined as P:0.002 ~ 0.014%, S:0 ~ 0.002%, N:0 ~ 0.08%.
Nb: niobium can significantly improve the austenite recrystallization temperature of steel, enlarges non-recrystallization district scope, is convenient to realize the high temperature controlled rolling, reduces mill load, and the while niobium can also suppress austenite crystal grows up, and has significant refined crystalline strengthening and precipitation strength effect.Thereby, niobium increased the hot cracking tendency that contains niobium steel strand but reducing the high temperature thermoplasticity of steel.Therefore, niobium is defined as 0.02 ~ 0.08%.
Ti: titanium has strong refined crystalline strengthening and precipitation strength effect; The titanium of trace can also at high temperature combine with carbon, oxygen; Form the precipitate of high temperature infusibility, the austenite crystal that helps suppressing welding heat affected zone is grown up, and significantly improves the toughness of welding heat affected zone.Therefore, titanium is defined as 0.005 ~ 0.03%.
Mo: molybdenum can significantly be postponed austenite to ferritic transformation; Suppress ferrite and pearlite forming core; Promotion has the formation of the bainite/acicular ferrite of high density dislocation substructure, make steel in rolling the cooling rate scope of a back broad, obtain bainite/acicular ferrite structure, but molybdenum belongs to precious metal; The addition increase can significantly improve the manufacturing cost of steel, and too high molybdenum also can cause the low-temperature flexibility of steel to worsen simultaneously.Therefore, molybdenum is defined as 0.05 ~ 0.40%.
V: vanadium can replenish the deficiency of niobium precipitation strength, can also improve the postwelding toughness of steel to a certain extent.But because vanadium has stronger precipitation strength and more weak refined crystalline strengthening effect, add excessive vanadium and be prone to cause the ductile-brittle transition temperature of steel to improve, therefore, vanadium is defined as 0.02 ~ 0.12%.
Cu: copper can improve the intensity and the corrosion resistance of steel alloy.Yet excess copper can gather partially and causes and hot-short phenomenon therefore, copper is defined as 0.05 ~ 0.3%.
Ni: nickel can reduce the ductile-brittle transition temperature of pipe line steel, improves the impact flexibility of steel.In addition, the check crack that nickel can also effectively stop the red brittleness of Cu to cause, and significantly improve the decay resistance of steel.But too high nickel content is prone to cause the steel plate iron scale to be difficult to remove, and causes the plate surface quality problem.Therefore, nickel is defined as 0.05 ~ 0.35%.
Cr: chromium is the quenching degree element that improves steel, has certain solution strengthening effect, and can improve weather-proof, the decay resistance of steel.Chromium is defined as 0 ~ 0.30%.
Al: aluminium is main deoxidant element in the steel, can significantly reduce the oxygen content in the steel, and aluminium and nitrogen combines formation AlN simultaneously; Crystal grain thinning effectively; But too much aluminium content is prone to cause the oxide inclusions of aluminium obviously to increase, and reduces the cleanliness factor of steel, and is unfavorable to the low-temperature flexibility of steel.Therefore, aluminium is defined as 0.005 ~ 0.05%.
Ca: calcium carries out calcium to steel in the double refining process handles, and can improve the inclusion morphology in the steel, significantly improves the transverse impact toughness of steel.Calcium is defined as 0.001 ~ 0.006%.
The technical solution that realizes above-mentioned purpose is: make the method for high strength, high tenacity X70 heavy caliber thick wall seamless pipe, comprise following concrete steps:
(1) presses X70 level pipe line steel composition proportion, become hollow ingot through centrifugal casting machine centrifugal casting through the X70 of external refining steel alloy molten steel;
(2) the front end outer surface with said hollow bloom is processed into the head of nipping of being with tapering, and the surfaces externally and internally of said hollow bloom and the head of nipping of said front end are carried out machined;
(3) at carbon steel endless member of the tail end of said hollow bloom welding, with substitute after rolling on the pilger mill must excision end portion;
(4) to the hollow bloom after handling in the step (3) heat, dephosphorization;
(5) in heating, hollow bloom after the dephosphorization, insert plug and location, send into pilger mill through feed system then and carry out back and forth rollingly, make the satisfactory pipe fitting of wall thickness, diameter and length;
(6) to said pipe fitting depoling rod, crop, back-end crop;
(7) to the said pipe fitting behind crop, the back-end crop again through heating, sizing, finishing, make qualified finished product tubing.
Further, step (1) described X70 level pipe line steel key component and percentage by weight are C:0.02 ~ 0.09, Si:0.04 ~ 0.40, Mn:1.0 ~ 1.60; P:0.002 ~ 0.014, S:0 ~ 0.002, N:0 ~ 0.08, Nb:0.02 ~ 0.08, Ti:0.004 ~ 0.03; Mo:0.05 ~ 0.20, Cu:0.05 ~ 0.10, V:0 ~ 0.08, Ni:0.05 ~ 0.30, Cr:0 ~ 0.20; Al:0.005 ~ 0.05, Ca:0.001 ~ 0.006, CE≤0.43%, Pcm≤0.22, all the other are Fe.
The described centrifugal casting of step (1) is on the rotation of casting mold and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, to carry out, and the heavy caliber hollow bloom that centrifugal casting goes out is for waiting penetrating hollow bloom in two ends of wall thickness.
The described centrifugal casting type tube of step (1) adopts the drum-type metal mold; The type tube temperature is 200 ~ 400 ℃ during cast; Poring rate is 50 ~ 200 Kilograms Per Second molten steel, 500 ~ 1400 rev/mins of constant type tube rotating speeds, and pouring temperature is confirmed as on liquidus temperature 100 ~ 300 ℃.Cast finishes, and treats that temperature drops under the solidus 30 ~ 100 ℃, and type tube reduces rotating speed to 300 ~ 500 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 500 ~ 800 ℃ after 20 ~ 30 minutes.
The length of the head of nipping of the described band tapering of step (2) is 300～450mm, and range of taper is between 1:2.5 ~ 1:3.3; The inner surface thickness of cutting of said hollow bloom is not less than 5mm, and the outer surface thickness of cutting of said hollow bloom is no less than 2mm.
The length of the described carbon steel endless member of step (3) is 500～900mm, the described gas-shield automatic welding that is welded as.
The described thermal recovery eddy-current heating that adds of step (4), heating-up temperature is 960-1000 ℃.
The described back and forth rolling feed of step (5) is 65～70% of a rolling carbon steel, and the ratio of width to height of roll deformation sector hole type is 1.0～1.05 times of rolling carbon steel.
The described depoling rod of step (6) be pipe fitting that pilger mill is shut out together with said plug, send into mandrel bar loosening mill and carry out the pine rod, more said pipe fitting is delivered on the rod drawing machine together with plug, said plug is extracted out from pipe fitting; Said crop end is with the head and tail end welding section excision of nipping of carbon steel section end to end.
The present invention compared with prior art, its remarkable advantage is:
(1) adopts the composition of less expensive to design and easier production technology, be fit to the seamless production of heavy caliber thick wall below the wall thickness 45mm.
(2) the large-calibre seamless pipe body global tissue of making is even, and carbon equivalent is low, and welding performance is good, and low temperature impact properties is good, can satisfy the desired excellence in deep-sea strong, mould, the toughness coupling, have high corrosion resistance simultaneously.
(3) the large-calibre seamless tube preparation method of patented invention need not operations such as " perforation ", " developing the hole ", does not need expensive large-tonnage cogging and pressing equipment, and can reduce and repeatedly heat link again and shorten heat time heating time, saves the energy 10%.
(4) this patent is made the large-calibre seamless pipe, and after machined, evenness of wall thickness and dimensional accuracy help improving the dimensional accuracy and the product percent of pass of finished product far above the hollow ingot that develops the hole, reduce follow-up finishing procedure workload.
The specific embodiment
The high tough heavy caliber of a kind of X70 level deep-sea seamless pipe manufacturing approach specifically may further comprise the steps:
(1) raw material with following chemical component weight percentage carries out the high-cleanness, high refining, and molten steel is used in the preparation casting:
C：0.02~0.09，Si：0.04~0.40，Mn：1.0~1.60，P：0.002~0.014，S：0~?0.002，N：0~0.08，Nb：0.02~0.08，Ti：0.004~0.03，Mo：0.05~0.20，Cu：0.05~0.10，V：0~0.08，Ni：0.05~0.30，Cr：0~0.20，Al：0.005~0.05，Ca：0.001~0.006，CE≤0.43%。Pcm≤0.22, all the other are Fe;
(2) said molten steel is the penetrating hollow bloom in two ends that the horizontal centrifugal casting machine centrifugal casting of 0 degree such as becomes at wall thickness through rotation and horizontal sextant angle; The centrifugal casting type tube adopts the drum-type metal mold; The type tube temperature is 200 ~ 400 ℃ during cast; Poring rate is 50 ~ 200 Kilograms Per Second molten steel, 500 ~ 1400 rev/mins of constant type tube rotating speeds, and pouring temperature is confirmed as on liquidus temperature 100 ~ 300 ℃.Cast finishes, and treats that temperature drops under the solidus 30 ~ 100 ℃, and type tube reduces rotating speed to 300 ~ 500 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 500 ~ 800 ℃ after 20 ~ 30 minutes;
(3) outer surface of said hollow bloom front end 300～450mm length is processed into the range of taper head of between 1:2.5 ~ 1:3.3, nipping; And the surfaces externally and internally of said hollow bloom and a surfaces externally and internally of nipping of said front end carried out cut; Thickness of cutting to said hollow bloom inner surface is not less than 5mm, and the thickness of cutting of outer surface is not less than 2mm;
(4) the tail end weld length at said hollow bloom is the carbon steel endless member of 500～900mm, and the said gas-shield automatic welding that is welded as;
(5) to the said hollow bloom after the above-mentioned processing in 960-1000 ℃, heat, dephosphorization.
(6) in heating, said hollow bloom after the dephosphorization, insert plug and location, send into pilger mill through feed system then and carry out back and forth rollingly, roll into the pipe fitting of required size.In the pepriodic rolling process, 65～70% when feed is rolling carbon steel and low-alloy steel; The ratio of width to height of roll deformation sector hole type is 1.01～1.05 times of rolling carbon steel, and said pilger mill percentage elongation is set at 4.8;
(7) to said pipe fitting depoling rod, crop, back-end crop.Said depoling rod be exactly pipe fitting that pilger mill is shut out with said plug together, sending into mandrel bar loosening mill, to carry out pine excellent, more said pipe fitting is transported on the rod drawing machine together with plug, and said plug is extracted out from said pipe fitting.Said crop adopts end shear that the said carbon steel endless member of said pipe fitting tail end welding and fore-end are nipped exactly and cuts away;
(8) to the said pipe fitting behind crop, the back-end crop again through heating, sizing, finishing, make the finished product pipe fitting of qualified required size.Said finishing comprises processing and the aligning that as required said pipe fitting is carried out, to satisfy the requirement under the different environments for use.
Embodiment 1
The deep-sea is with the seamless steel of X70, and its key component and percentage by weight are: C:0.02%, Si:0.40%, Mn:1.0%, P:0.005%; S:0.002%, N:0.02%, Nb:0.02%, Ti:0.004%; Mo:0.05%, Cu:0.05, V:0.05%, Ni:0.05%; Cr:0.005%, Al:0.005%, Ca:0.001%, all the other are Fe and other unavoidable impurities.Simultaneously, also need satisfy carbon equivalent ce=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.214%≤0.43%.Welding cold cracking sensitivity coefficient Pcm=C+Si/20+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10=0.10%≤0.22%.
Make the deep-sea use cross sectional dimensions be
350
method of the X70 grade of steel seamless pipe of 25mm, the steps include:
(1) batching is the penetrating hollow bloom in two ends that the 0 horizontal centrifugal casting machine centrifugal casting of spending such as becomes at wall thickness through the molten steel of external refining through rotation and horizontal sextant angle; The type tube temperature is 200 ℃ during cast, and casting rate is 100 Kilograms Per Second molten steel, 800 rev/mins of constant type tube rotating speeds, and pouring temperature is on the liquidus temperature 100 ℃.Cast finishes, and treats that temperature drops under the solidus 50 ℃, and type tube reduces rotating speed to 300 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 600 ℃ after 30 minutes;
(2) said hollow bloom is carried out machined, that front end is nipped the head length degree is 300mm, and nose cone degree 1:2.5 nips; Said hollow bloom inner surface is cut; Thickness is 5mm, and the thickness of cutting of outer surface is 2mm, adopts gas-shield automatic welding; The tail end weld length is the carbon steel endless member of 500mm, adopts eddy-current heating to 1000 ℃ of temperature and dephosphorization;
(3) with inserting plug and location in the hollow bloom in the step (2), to send into pilger mill through feed system then and carry out back and forth rollingly, feed is 65% of a rolling carbon steel; The ratio of width to height of roll deformation sector hole type is 1.01 times of rolling carbon steel; The pilger mill percentage elongation is set at 4.8; Make X70 large-calibre seamless pipe, size
350
25mm;
(4) to said pipe fitting depoling rod, crop, back-end crop.Through heating, sizing, finishing, make qualified finished product tubing again.
The X70 level seamless pipe comprehensive mechanical property that utilizes present embodiment to make is good, and its implementation result is as shown in table 1.
Embodiment 2
The deep-sea is with the seamless steel of X70, and its key component and percentage by weight are: C:0.06%, Si:0.20%, Mn:1.4%, P:0.002%; S:0.001%, N:0.05%, Nb:0.02%, Ti:0.006%; Mo:0.2%, Cu:0.08, V:0.03%, Ni:0.05%; Cr:0.10%, Al:0.03%, Ca:0.003%, all the other are Fe and other unavoidable impurities.Simultaneously, also need satisfy carbon equivalent ce=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.37%≤0.43%.Welding cold cracking sensitivity coefficient Pcm=C+Si/20+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10=0.166%≤0.22%.
Make the deep-sea use cross sectional dimensions be
450
method of the X70 grade of steel seamless pipe of 35mm, the steps include:
(1) batching becomes hollow bloom through the high-alloy steel molten steel of external refining through centrifugal casting machine centrifugal casting; The type tube temperature is 300 ℃ during casting, and casting rate is 150 Kilograms Per Second molten steel, 1000 rev/mins of constant type tube rotating speeds, and pouring temperature is confirmed as on liquidus temperature 200 ℃.Cast finishes, and treats that temperature drops under the solidus 80 ℃, and type tube reduces rotating speed to 400 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 700 ℃ after 20 minutes;
(2) said hollow bloom is carried out machined, that front end is nipped the head length degree is 380mm, and nose cone degree 1:2.8 nips; Said hollow bloom inner surface is cut; Thickness is 6mm, and the thickness of cutting of outer surface is 3mm, adopts gas-shield automatic welding; The tail end weld length is 700 carbon steel endless member, adopts eddy-current heating to 980 ℃ of temperature and dephosphorization;
(3) with inserting plug and location in the hollow bloom in the step (2), then through feed system send into pilger mill carry out back and forth rolling, 68% when feed is rolling carbon steel; The ratio of width to height of roll deformation sector hole type is 1.03 times of rolling carbon steel; The pilger mill percentage elongation is set at 4.8; Make X70 large-calibre seamless pipe, size
450
35mm;
(4) to said pipe fitting depoling rod, crop, back-end crop.Through heating, sizing, finishing, make qualified finished product tubing again.
The X70 level seamless pipe comprehensive mechanical property that utilizes present embodiment to make is good, and its implementation result is as shown in table 1.
Embodiment 3
The deep-sea is with the seamless steel of X70, and its key component and percentage by weight are: C:0.09%, Si:0.04%, Mn:1.6%, P:0.01%; S:0.0005%, N:0.08%, Nb:0.08%, Ti:0.03%; Mo:0.2%, Cu:0.1%, V:0.08%, Ni:0.3%; Cr:0.2%, Al:0.05%, Ca:0.006%, all the other are Fe and other unavoidable impurities.Simultaneously, also need satisfy carbon equivalent ce=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15=0.43%≤0.43%.Welding cold cracking sensitivity coefficient Pcm=C+Si/20+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10=0.22%≤0.22%.
Make the deep-sea use cross sectional dimensions be
550
method of the X70 grade of steel seamless pipe of 45mm, the steps include:
(1) batching becomes hollow bloom through the high-alloy steel molten steel of external refining through centrifugal casting machine centrifugal casting; The type tube temperature is 400 ℃ during cast, and casting rate is 200 Kilograms Per Second molten steel, 1300 rev/mins of constant type tube rotating speeds, and pouring temperature is confirmed as on liquidus temperature 300 ℃.Cast finishes, and treats that temperature drops under the solidus 100 ℃, and type tube reduces rotating speed to 500 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 800 ℃ after 25 minutes;
(2) said hollow bloom is carried out machined, that front end is nipped the head length degree is 450mm, and nose cone degree 1:3.3 nips; Said hollow bloom inner surface is cut; Thickness is 5.5mm, and the thickness of cutting of outer surface is 2.5mm, adopts gas-shield automatic welding; The tail end weld length is the carbon steel endless member of 900mm, adopts eddy-current heating to 960 ℃ of temperature and dephosphorization dephosphorization;
(3) with inserting plug and location in the hollow bloom in (2), then through feed system send into pilger mill carry out back and forth rolling, 70% when feed is rolling carbon steel and low-alloy steel; The ratio of width to height of roll deformation sector hole type is 1.05 times of rolling carbon steel; The pilger mill percentage elongation is set at 4.8; Make heavy caliber X70 seamless pipe, size
550
45mm;
(4) to said pipe fitting depoling rod, crop, back-end crop.Through heating, sizing, finishing, make qualified finished product tubing again.
The X70 level seamless pipe comprehensive mechanical property that utilizes present embodiment to make is good, and its implementation result is as shown in table 1, can know from table 1, and the X70 level large-calibre seamless pipe that adopts this patent to obtain, yield strength, tensile strength and low-temperature impact toughness are superior to existing level.
The Performance Detection statistical form of each embodiment of table 1
| Sequence number | Yield strength (MPa) | Tensile strength (MPa) | Yield tensile ratio | Percentage elongation (%) | Summer is than V-type-35 ℃ horizontal full-scale ballistic work (J) |
| 1 | 526 | 632 | 0.82 | 38 | 255 |
| 2 | 548 | 629 | 0.87 | 45 | 262 |
| 3 | 539 | 646 | 0.83 | 36 | 275 |
Claims (10)
1. a deep-sea is characterized in that with X70 level heavy caliber thick wall seamless pipe said seamless pipe prepares according to the following steps:
Step 1, press X70 level pipe line steel composition proportion, become hollow ingot through centrifugal casting machine centrifugal casting through the X70 of external refining steel alloy molten steel;
Step 2, the front end outer surface of said hollow bloom is processed into the head of nipping of band tapering, and the surfaces externally and internally of said hollow bloom and the head of nipping of said front end are carried out machined;
Step 3, at carbon steel endless member of the tail end of said hollow bloom welding, with substitute after rolling on the pilger mill must excision end portion;
Step 4, to the hollow bloom after handling in the step 3 heat, dephosphorization;
Step 5, in heating, hollow bloom after the dephosphorization, insert plug and location, send into pilger mill through feed system then and carry out back and forth rollingly, make the satisfactory pipe fitting of wall thickness, diameter and length;
Step 6, to said pipe fitting depoling rod, crop, back-end crop;
Step 7, to the said pipe fitting behind crop, the back-end crop again through heating, sizing, finishing, make qualified finished product tubing.
2. deep-sea according to claim 1 is characterized in that the described X70 level of step 1 pipe line steel key component and percentage by weight do, C:0.02 ~ 0.09, Si:0.04 ~ 0.40 with X70 level heavy caliber thick wall seamless pipe; Mn:1.0 ~ 1.60, P:0.002 ~ 0.014, S:0 ~ 0.002, N:0 ~ 0.08; Nb:0.02 ~ 0.08, Ti:0.004 ~ 0.03, Mo:0.05 ~ 0.20, Cu:0.05 ~ 0.10; V:0 ~ 0.08, Ni:0.05 ~ 0.30, Cr:0 ~ 0.20, Al:0.005 ~ 0.05; Ca:0.001 ~ 0.006, CE≤0.43%, Pcm≤0.22, all the other are Fe; Described centrifugal casting machine is that rotation and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, and described centrifugal casting type tube adopts the drum-type metal mold, and the type tube temperature is 200 ~ 400 ℃ during cast; Poring rate is 50 ~ 200 Kilograms Per Second molten steel; 500 ~ 1400 rev/mins of constant type tube rotating speeds, pouring temperature are confirmed as on liquidus temperature 100 ~ 300 ℃, and cast finishes; Treat that temperature drops under the solidus 30 ~ 100 ℃; Type tube reduces rotating speed to 300 ~ 500 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 500 ~ 800 ℃ after 20 ~ 30 minutes.
3. deep-sea according to claim 1 is characterized in that with X70 level heavy caliber thick wall seamless pipe the length of the head of nipping of the described band tapering of step 2 is 300～450mm, and range of taper is between 1:2.5 ~ 1:3.3; The inner surface thickness of cutting of said hollow bloom is not less than 5mm, and the outer surface thickness of cutting of said hollow bloom is no less than 2mm.
4. deep-sea according to claim 1 is with X70 level heavy caliber thick wall seamless pipe, and the length that it is characterized in that the described carbon steel endless member of step 3 is 500～900mm, the described gas-shield automatic welding that is welded as.
5. deep-sea according to claim 1 is characterized in that the described thermal recovery eddy-current heating that adds of step 4 with X70 level heavy caliber thick wall seamless pipe, and heating-up temperature is 960-1000 ℃.
6. deep-sea according to claim 1 is characterized in that with X70 level heavy caliber thick wall seamless pipe the described back and forth rolling feed of step 5 is 65～70% of a rolling carbon steel, and the ratio of width to height of roll deformation sector hole type is 1.0～1.05 times of rolling carbon steel.
7. a deep-sea is characterized in that said method comprising the steps of with the preparation method of X70 level heavy caliber thick wall seamless pipe:
Step 1, press X70 level pipe line steel composition proportion, become hollow ingot through centrifugal casting machine centrifugal casting through the X70 of external refining steel alloy molten steel;
Step 2, the front end outer surface of said hollow bloom is processed into the head of nipping of band tapering, and the surfaces externally and internally of said hollow bloom and the head of nipping of said front end are carried out machined;
Step 3, at carbon steel endless member of the tail end of said hollow bloom welding, with substitute after rolling on the pilger mill must excision end portion;
Step 4, to the hollow bloom after handling in the step 3 heat, dephosphorization;
Step 5, in heating, hollow bloom after the dephosphorization, insert plug and location, send into pilger mill through feed system then and carry out back and forth rollingly, make the satisfactory pipe fitting of wall thickness, diameter and length;
Step 6, to said pipe fitting depoling rod, crop, back-end crop;
Step 7, to the said pipe fitting behind crop, the back-end crop again through heating, sizing, finishing, make qualified finished product tubing.
8. deep-sea according to claim 7 is characterized in that with the preparation method of X70 level heavy caliber thick wall seamless pipe: the described X70 level of step 1 pipe line steel key component and percentage by weight are C:0.02 ~ 0.09, Si:0.04 ~ 0.40; Mn:1.0 ~ 1.60, P:0.002 ~ 0.014, S:0 ~ 0.002, N:0 ~ 0.08; Nb:0.02 ~ 0.08, Ti:0.004 ~ 0.03, Mo:0.05 ~ 0.20, Cu:0.05 ~ 0.10; V:0 ~ 0.08, Ni:0.05 ~ 0.30, Cr:0 ~ 0.20, Al:0.005 ~ 0.05; Ca:0.001 ~ 0.006, CE≤0.43%, Pcm≤0.22, all the other are Fe; Described centrifugal casting machine is that rotation and horizontal sextant angle are the horizontal centrifugal casting machine of 0 degree, and described centrifugal casting type tube adopts the drum-type metal mold, and the type tube temperature is 200 ~ 400 ℃ during cast; Poring rate is 50 ~ 200 Kilograms Per Second molten steel; 500 ~ 1400 rev/mins of constant type tube rotating speeds, pouring temperature are confirmed as on liquidus temperature 100 ~ 300 ℃, and cast finishes; Treat that temperature drops under the solidus 30 ~ 100 ℃; Type tube reduces rotating speed to 300 ~ 500 rev/min, and rotation keeps stopping the demoulding when steel pipe temperature is reduced to 500 ~ 800 ℃ after 20 ~ 30 minutes.
9. deep-sea according to claim 7 is characterized in that with the preparation method of X70 level heavy caliber thick wall seamless pipe the length of the head of nipping of the described band tapering of step 2 is 300～450mm, and range of taper is between 1:2.5 ~ 1:3.3; The inner surface thickness of cutting of said hollow bloom is not less than 5mm, and the outer surface thickness of cutting of said hollow bloom is no less than 2mm; The length of the described carbon steel endless member of step 3 is 500～900mm, the described gas-shield automatic welding that is welded as.
10. deep-sea according to claim 7 is characterized in that the described thermal recovery eddy-current heating that adds of step 4) with the preparation method of X70 level heavy caliber thick wall seamless pipe, and heating-up temperature is 960-1000 ℃; The described back and forth rolling feed of step 5 is 65～70% of a rolling carbon steel, and the ratio of width to height of roll deformation sector hole type is 1.0～1.05 times of rolling carbon steel.
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Application publication date: 20120801 |