CN106191656A - A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application - Google Patents
A kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application Download PDFInfo
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- CN106191656A CN106191656A CN201610683380.2A CN201610683380A CN106191656A CN 106191656 A CN106191656 A CN 106191656A CN 201610683380 A CN201610683380 A CN 201610683380A CN 106191656 A CN106191656 A CN 106191656A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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Abstract
The invention discloses a kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application.Wherein, the percentage by weight of the chemical constituent of this seamless steel pipe be C 0.20～0.35%, Si 0.20～0.70%, Mn 0.30～0.80%, P≤0.012%, S≤0.003%, Cr 0.70～1.50%, Mo 0.50～1.20%, V 0.10～0.50%, Ni≤0.10%, Al 0.01～0.05%, surplus be ferrum Fe and inevitable impurity.Application technical scheme, strict controls each chemical constituent content in raw material, by proportioning rational between each chemical constituent so as to get the intensity of seamless steel pipe and toughness all disclosure satisfy that the exploitation requirement of deep-well, ultradeep well oil gas field.
Description
Technical field
The present invention relates to steel tube fabrication technique field, in particular to a kind of seamless steel of high-intensity high-tenacity oil gas
Pipe, its manufacture method and application.
Background technology
Along with oil, the continuous exploitation of natural gas resource, petroleum natural gas exploration is expanded to polar region and ocean.Towards
The bad working environments environment such as deep-well, marine site, exploitation difficulty is increasing, and oil gas pipe is proposed higher performance requirement.Country
Proposing oil-gas resource to be strengthened exploration dynamics in Iron & Steel Development planning, emphasis developing unconventional petroleum resources investigation is surveyed
Visit.Petroleum natural gas exploration has a clear and definite and urgent demand to high-intensity high-tenacity oil gas seamless steel pipe, but state's internal phase
Close product and can't fully meet use requirement.
General tube material is while intensity improves, and toughness has a certain degree of weakening, particularly works as yield strength
When reaching 1000MPa, toughness deficiency problem is the most prominent.The toughness of steel is often depending on the microscopic structure composition of product, crystal grain
Multiple factors such as orientation and degree of refinement, good obdurability coupling relates to the integrated use of multinomial material toughening technology.Cause
This, high-intensity high-tenacity oil gas seamless steel pipe and manufacture method thereof are referred to as global technical barrier.
Summary of the invention
It is desirable to provide a kind of high-intensity high-tenacity oil gas seamless steel pipe, its manufacture method and application, to improve
The intensity of seamless steel pipe and toughness.
To achieve these goals, according to an aspect of the invention, it is provided a kind of strength high toughness oil gas is with seamless
Steel pipe.The percentage by weight of the chemical constituent of this strength high toughness oil gas seamless steel pipe is C 0.20～0.35%, Si 0.20
～0.70%, Mn 0.30～0.80%, P≤0.012%, S≤0.003%, Cr 0.70～1.50%, Mo 0.50～
1.20%, V 0.10～0.50%, Ni≤0.10%, Al 0.01～0.05%, surplus are ferrum Fe and inevitable impurity.
According to a further aspect in the invention, it is provided that the manufacturer of a kind of above-mentioned strength high toughness oil gas seamless steel pipe
Method.This manufacture method comprises the following steps: step S1, enters according to the chemical constituent of above-mentioned strength high toughness oil gas seamless steel pipe
Row dispensing, obtains raw material, and raw material is carried out smelting obtains blank；Step S2, carries out rolling to blank and obtains pipe；And step
Rapid S3, is thermally treated resulting in strength high toughness oil gas seamless steel pipe to pipe.
Further, multiple during the dispensing of raw material includes molten iron, steel scrap, ferroalloy and aluminum in step S1.
Further, after step S1 obtains raw material, specifically include: by raw material through electric furnace smelting, external refining, vacuum
Degassing and arc continuous casting obtain blank.
Further, during carrying out arc continuous casting, casting speed controls 0.5～0.8m/min；Shaking of crystallizer
Dynamic frequency is 180～220opm, and amplitude is ± 2～4mm, and side-play amount adjusting range is 10～30%.
Further, step S2 includes: step S21, by blank heating to 1250～1280 DEG C, and is incubated 40～50min,
Obtain hot base；Step S22, carries out hot base cone-type piercer at 1130～1200 DEG C, obtains hollow billet；Step S23, utilizes tube rolling
Hollow billet is carried out tube rolling by machine, obtains hollow forging；And step S24, hollow forging is carried out sizing and obtains pipe.
Further, step S21 specifically includes: blank sequentially passes through preheating section heating, I section of heating of heating, heating II
Duan Jiare, III section of heating of heating, IV section of heating of heating, heating V section heating and soaking, be more than the total processing time of step S21
Or equal to 4h, wherein, after preheating section heats, the temperature of blank reaches 790～810 DEG C, blank after heating I section heating
Temperature reach 820～1000 DEG C, after heating II section heating, the temperature of blank reaches 1090～1150 DEG C, through heating III
After Duan Jiare, the temperature of blank reaches 1190～1250 DEG C, and after heating IV section heating, the temperature of blank reaches 1220～1280
DEG C, after heating V section heating, the temperature of blank reaches 1230～1280 DEG C, then 1250～1280 DEG C of soaking 40～
After 50min, obtain hot base.
Further, the pipe mill in step S23 is Continuous mill train, during tube rolling the feed quantity of hollow billet be 30～
100mm, the rotating speed of roll is between 22～52rpm, and blast is between 4.5～6bar.
Further, step S3 includes: step S31, at 910～930 DEG C, quenches pipe, insulation 90～
Cool down after 120min；And step S32, at 680～700 DEG C, to cooling after pipe be tempered, insulation 120～
After 160min, air cooling obtains strength high toughness oil gas seamless steel pipe.
In accordance with a further aspect of the present invention, it is provided that a kind of above-mentioned strength high toughness oil gas seamless steel pipe is in oil-gas mining
And the application in transport.
Application technical scheme, each chemical constituent content in strict control raw material, between each chemical constituent
Reasonably proportioning so as to get the intensity of seamless steel pipe and toughness all disclosure satisfy that the exploitation requirement of deep-well, ultradeep well oil gas field.
Detailed description of the invention
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Combination mutually.The present invention is described in detail below in conjunction with embodiment.
According to a kind of typical embodiment of the present invention, it is provided that a kind of strength high toughness oil gas seamless steel pipe.This intensity
The percentage by weight of the chemical constituent of high tenacity oil gas seamless steel pipe is C 0.20～0.35%, Si 0.20～0.70%, Mn
0.30～0.80%, P≤0.012%, S≤0.003%, Cr 0.70～1.50%, Mo 0.50～1.20%, V 0.10～
0.50%, Ni≤0.10%, Al 0.01～0.05%, surplus are ferrum Fe and inevitable impurity.
Wherein, C content controls between 0.20～0.35%, can improve the quenching degree of steel, refines microstructure.C content
Too high, unfavorable to the toughness of steel；C content is too low, can reduce the mechanical property of steel；Si constituent content controls 0.20～0.70%
Between, can realize removing the effect of oxygen in raw material and delta ferrite can be suppressed again to crystallize, and then raising makes the tough of seamless steel pipe
Property, Si too high levels can cause the toughness of steel drastically to decline；Mn content controls, between 0.30～0.80%, to improve raw material
Quenching degree, stable austenite tissue, raw material grain coarsening will not be made because of Mn too high levels again, cause strand occurs partially
Analysis and crackle；Cr content controls, 0.70～1.50%, to cooperate with Mn element, can improve the quenching degree of raw material, is returning
Precipitation and the gathering of carbide can be stoped or slow down again during fire, improve steel belt roof bolt stability；Mo content control 0.50～
Between 1.20%, by intensity and the toughness of the performance boost seamless steel pipe of its phase transformation strengthening and solution strengthening, can carry simultaneously
High temper resistance.But Mo too high levels can be significantly increased cost；V content controls between 0.10～0.50%, it is possible to refinement
Crystal grain, makes steel billet be unlikely to the thickest of growth at heating period austenite crystal, so that in the operation of rolling subsequently, can
So that the crystal grain of steel is refined further, improve intensity and the toughness of steel；Meanwhile, Al content control 0.01～0.05% it
Between.Al is the deoxidizer that steel is good, it is possible to coordinates the oxygen in removing raw material with Si, and makes its content can have below 0.05%
Effect field trash is avoided to occur reducing so that the toughness of seamless steel pipe and surface defect occurring with bulk.It addition, Al can also be thin
Change crystal grain, reduce the brittle transition temperature of steel.S Yu P is harmful element, and its content strictly to control, therefore, and P content control
System is below 0.012%, and S content controls below 0.003%.
Application technical scheme, each chemical constituent content in strict control raw material, between each chemical constituent
Reasonably proportioning so as to get the intensity of seamless steel pipe and toughness all disclosure satisfy that the exploitation requirement of deep-well, ultradeep well oil gas field.
According to a kind of typical embodiment of the present invention, it is provided that the system of a kind of above-mentioned strength high toughness oil gas seamless steel pipe
Make method.This manufacture method comprises the following steps: step S1, according to the chemical group of above-mentioned strength high toughness oil gas seamless steel pipe
Point carry out dispensing, obtain raw material, and raw material is carried out smelting obtain blank；Step S2, carries out rolling to blank and obtains pipe；With
And step S3, pipe is thermally treated resulting in strength high toughness oil gas seamless steel pipe.The manufacture method using the present invention can
So that the yield strength of seamless steel pipe reaches more than 1034MPa, tensile strength reaches more than 1150MPa, and-20 DEG C of Charpy V-types are horizontal
Reaching more than 80J to full-scale ballistic work, properties all disclosure satisfy that the exploitation requirement of deep-well, ultradeep well oil gas field, it is achieved
Material high intensity and the good fitting of high tenacity.
The application is in order to save the manufacturing cost of seamless steel pipe further and obtain the raw material with predetermined chemical composition, excellent
It is multiple that the dispensing selecting above-mentioned raw materials includes in molten iron, steel scrap, ferroalloy and aluminum.Wherein ferroalloy, aluminium wire can smelted
Adding in journey and can not only supplement the chemical composition in raw material, aluminium wire is added in steel to react with oxygen and generates Al2O3, going out
The Al generated when steel, calmness and casting2O3Major part floats and gets rid of, it is achieved deoxidation purpose.Preferably, step S1 obtains raw material
After, specifically include: raw material is obtained blank through electric furnace smelting, external refining, vacuum outgas and arc continuous casting.Use ability
In territory, the raw material after optimization of Chemical Composition is smelted by the electric furnace smelting of routine, external refining, vacuum outgas, arc continuous casting
To blank, this blank has preferable quenching degree.
Preferably, during carrying out arc continuous casting, casting speed controls 0.5～0.8m/min；The vibration of crystallizer
Frequency is 180～220opm, and amplitude is ± 2～4mm, and side-play amount adjusting range is 10～30%.During arc continuous casting, knot
Brilliant device makes the slag inclusion in molten steel and bubble floating with above-mentioned frequency vibration, reduces blank surface slag inclusion, pore, crackle, and
And use vibrating device the green shell of blank to be separated with crystallizer inwall, both can guarantee that green shell is held with tube wall under vibrating conditions
Continuous separate, control again frequency of vibration and amplitude, it is ensured that the stable type of separation, it is to avoid green shell produces viscous in vibration processes
Knot, in turn results in the generation of circular pipe blank face crack.
According to a kind of typical embodiment of the present invention, step S2 includes: step S21, by blank heating to 1250～
1280 DEG C, and it is incubated 40～50min, obtain hot base；Step S22, carries out cone-type piercer at 1130～1200 DEG C by hot base,
To hollow billet；Step S23, utilizes pipe mill that hollow billet is carried out tube rolling, obtains hollow forging；And step S24, hollow forging is carried out sizing and obtains
To pipe.After blank heating, its interior tissue is more uniformly distributed, and carries out hot piercing cooperation at 1130～1200 DEG C to perforation
The control of technological parameter obtains the hollow billet that uniform diameter, mechanical property are homogeneous；And then ensure that the hollow forging that obtains with this hollow billet
Quality.
Preferably, step S21 specifically includes: blank sequentially passes through preheating section heating, I section of heating of heating, heating II section
Heating, III section of heating of heating, IV section of heating of heating, heating V section are heated and soaking, be more than the total processing time of step S21 or
Equal to 4h, wherein, after preheating section heats, the temperature of blank reaches 790～810 DEG C, blank after heating I section heating
Temperature reaches 820～1000 DEG C, and after heating II section heating, the temperature of blank reaches 1090～1150 DEG C, through heating III section
After heating, the temperature of blank reaches 1190～1250 DEG C, and after heating IV section heating, the temperature of blank reaches 1220～1280
DEG C, after heating V section heating, the temperature of blank reaches 1230～1280 DEG C, then 1250～1280 DEG C of soaking 40～
After 50min, obtain hot base.By above-mentioned zone heating, pipe is made to be stepped up to soaking temperature, it is to avoid programming rate mistake
Cause the defect cracked in hot base soon.
Preferably, the pipe mill in step S23 is Continuous mill train, and during tube rolling, the feed quantity of hollow billet is 30～100mm,
The rotating speed of roll is between 22～52rpm, and blast is between 4.5～6bar.Continuous mill train has stranding and pricks character, beneficially metal
Extension, make hollow billet be in micro tension milling state, thus reduce the transversely deforming of hollow billet, it is achieved that improve in seamless steel pipe
Outer surface quality and the purpose of dimensional accuracy.
According to a kind of typical embodiment of the present invention, step S3 includes: step S31, at 910～930 DEG C, to pipe
Quench, cool down after insulation 90～120min；And step S32, at 680～700 DEG C, the pipe after cooling is carried out back
Fire, after insulation 120～160min, air cooling obtains strength high toughness oil gas seamless steel pipe.Quenching and preserving heat 90 at 910～930 DEG C
～120min, it is ensured that the uniformity of steel pipe austenitizing, make alloy at the uniform velocity be substantially dissolved in austenite simultaneously；The quickest
Cooling, can use quick water-cooled；Then tempering insulation 120～160min at 680～700 DEG C, makes alloying element from satiety
Fully separating out in the solid solution of sum, the tissue after obtaining the carbide of disperse and making tempering tends to stable, air cooling afterwards.Above-mentioned
In heat treatment process, alloys producing is fully played, and then decreases seamless steel pipe internal stress, improves in steel pipe
The stability of portion's metallographic structure, improves plasticity and the toughness of seamless steel pipe.
According to a kind of typical embodiment of the present invention, it is provided that the intensity high-ductility that a kind of any of the above-described kind of manufacture method obtains
Property oil gas seamless steel pipe.
Use the percentage by weight of each chemical constituent in the seamless steel pipe that obtains of the present processes be C 0.20～
0.35%, Si 0.20～0.70%, Mn 0.30～0.80%, P≤0.012%, S≤0.003%, Cr 0.70～1.50%,
Mo 0.50～1.20%, V 0.10～0.50%, Ni≤0.10%, Al 0.01～0.05%, surplus are ferrum Fe and can not keep away
Exempt from impurity, and there is higher intensity and good toughness, be fully able to meet the exploitation requirement of deep-well oil gas field, especially may be used
So that the ultradeep well environment severe at working condition to use.And use bending of the seamless steel pipe that the manufacture method of the application obtains
Take intensity at more than 1034MPa, tensile strength at more than 1150MPa ,-20 DEG C of horizontal full-scale ballistic works of Charpy V-type 80J with
On, there is preferable intensity and toughness coupling.
According to a kind of typical embodiment of the present invention, it is provided that a kind of above-mentioned seamless steel pipe is in oil-gas mining and transport
Application.
Below with reference to embodiment, further illustrate the beneficial effect of the application.
By way of example only, it can not limit protection scope of the present invention to embodiment 1, for those skilled in the art
Speech,
Under the enlightenment and teaching of the present invention, it is possible to suitably regulate chemistry in raw material according to the performance requirement of product steel pipe and become
The composition divided and heating condition.
Embodiment 1
(1) smelting of blank
According to giving up that the ratio interpolation molten iron of 500kg/t and the ratio of 500kg/t are added production well pipe kind and produced
Steel, as raw material, through 45 tons of electric furnace smeltings, 45 tons of refining furnace refines, and in smelting process add 3kg/t ferrosilicon,
18kg/t low-carbon ferromanganese, 2.5kg/t vanadium iron, 9kg/t chromic carbide iron, 7kg/t molybdenum-iron and a small amount of aluminium wire and ferrotianium, by above-mentioned former
Material uses 45 tons of vacuum degassing furnace techniques to carry out the vacuum metling of molten steel；Then circle base circular-arc type continuous casting machine is used to carry out continuous casting；?
In said process, control refining furnace ladle bull ladle liquid steel temperature=liquidus temperature+(70～100) ± 10 DEG C；Baking of tundish 3
Hour, baking temperature more than 1100 DEG C；Casting speed controls at 0.640m/min；The frequency of vibration adjusting range of crystallizer
200opm, amplitude adjusting range ± 2～4mm, side-play amount adjusting range 10～30%；Crystallizer cooling water inflow controls: 4500L/
min.After blank is cut scale, carry out slow cooling.The content of each chemical composition in detection blank, testing result is shown in Table 1.
Table 1
| Element | C | Si | Mn | P | S | Cr | Mo | Ni |
| Content (wt%) | 0.22 | 0.25 | 0.42 | 0.007 | 0.001 | 0.81 | 0.64 | 0.02 |
| Element | V | Al | ||||||
| Content (wt%) | 0.26 | 0.014 |
(2) steel pipe rolling
The heating of blank: useBlank produces, and blank heating cycle according to table 2 in annular furnace is carried out
Heating.
Table 2
Cone-type piercer: preparationDuring oil gas seamless steel pipe, carry out at piercing temperature is 1183 DEG C
Cone-type piercer, blank diameter total reduction is 11%, and roll spacing is 296.6mm, and roll feed angle is 11 °, and roll roll off angle is
15 °, obtaining dimensions isHollow billet.
Rolling: employing pass isMPM Tube Rolling Train above-mentioned hollow billet is rolled, the feed quantity of hollow billet exists
70mm, roll rotational speed controls between 40rpm, and blast controls 4.5～6bar, obtains specification and isHollow forging.
Hot size: by the hollow forging after de-rod after step-by-step movement reheating furnace is heated to 940 DEG C, by the water under high pressure of 17MPa
Dephosphorization apparatus, 12 framves mutually against and the three-roll sizing mill frame of tandem on carry out continuous rolling process, prepared specification isPipe.
(3) heat treatment
Steel pipe is heated to 920 ± 10 DEG C, and temperature retention time 100min, and employing shrend of coming out of the stove subsequently is quickly cooled to room temperature,
Steel pipe cool time in water is 30 seconds；Then at 690 ± 10 DEG C, after tempering insulation time 130min, air cooling, to room temperature, obtains
The seamless steel pipe of embodiment 1.
Measuring the size of any 10 seamless steel pipes of embodiment 1, measurement result is shown in Table 3；According to " product made from steel power
Learn the standard method of performance test and definition " in the method for regulation any two seamless steel pipes of embodiment 1 are carried out stretching examination
Testing and impact test, result of the test is shown in Table 4.
Table 3
Table 4
By the data in table 3 it can be seen that the dimensional accuracy of product is within the scope of standard-required, it is fully able to meet
The requirement of 150ksi grade of steel；By the data in table 4 it can be seen that the yield strength of steel pipe of embodiment 1, hot strength, elongation
The most quite or the highest, especially low-temperature impact work is the most excellent for rate, low-temperature impact work and the proposed standard of 150ksi grade of steel
In standard-required, therefore, the stretching of seamless steel pipe, impact flexibility that the manufacture method of employing the application obtains are the most excellent,
The exploitation requirement of deep-well, ultradeep well oil gas field can be suitable for.
Embodiment 2
(1) smelting of blank
According to giving up that the ratio interpolation molten iron of 600kg/t and the ratio of 400kg/ are added production well pipe kind and produced
Steel, as raw material, through 45 tons of electric furnace smeltings, 45 tons of refining furnace refines, and adds according to following ratio in smelting process:
2kg/t ferrosilicon, 19kg/t low-carbon ferromanganese, 2.0kg/t vanadium iron, 8kg/t chromic carbide iron, 8kg/t molybdenum-iron and a small amount of aluminium wire and titanium
Ferrum, uses 45 tons of vacuum degassing furnace techniques to carry out the vacuum metling of molten steel above-mentioned raw materials；Then feed calcium line and carry out Calcium treatment, so
Rear employing circle base circular-arc type continuous casting machine carries out continuous casting；In above process, refining furnace ladle bull ladle liquid steel temperature=liquidus curve is controlled
Temperature+(70～100) ± 10 DEG C；Baking of tundish 3 hours, baking temperature more than 1100 DEG C；Casting speed controls at 0.80m/
min；Frequency of vibration adjusting range 220opm of crystallizer, amplitude adjusting range ± 2～4mm, side-play amount adjusting range 10～
30%；Crystallizer cooling water inflow controls: 4500L/min.After blank is cut scale, carry out slow cooling.In detection blank, each chemistry becomes
The content divided, testing result is shown in Table 5.
Table 5
| Element | C | Si | Mn | P | S | Cr | Mo | Ni |
| Content (wt%) | 0.20 | 0.28 | 0.45 | 0.005 | 0.001 | 0.76 | 0.62 | 0.02 |
| Element | V | Al | ||||||
| Content (wt%) | 0.29 | 0.016 |
(2) steel pipe rolling
The heating of blank: useBlank produces, and blank heating cycle according to table 6 in annular furnace is carried out
Heating.
Table 6
Cone-type piercer: preparationDuring oil gas seamless steel pipe, carry out at piercing temperature is 1120 DEG C
Cone-type piercer, blank diameter total reduction is 11%, and roll spacing is 296.6mm, and roll feed angle is 11 °, and roll roll off angle is
15 °,
Obtaining dimensions isHollow billet.
Rolling: employing pass isMPM Tube Rolling Train above-mentioned hollow billet is rolled, the feed quantity of hollow billet exists
100mm, roll rotational speed controls between 52rpm, and blast controls 4.5～6bar, obtains specification and isFamine
Pipe.
Hot size: by the hollow forging after de-rod after step-by-step movement reheating furnace is heated to 940 DEG C, by the water under high pressure of 17MPa
Dephosphorization apparatus, 12 framves mutually against and the three-roll sizing mill frame of tandem on carry out continuous rolling process, prepared specification isPipe.
(3) heat treatment
Steel pipe is heated to 920 ± 10 DEG C, and temperature retention time 100min, and employing shrend of coming out of the stove subsequently is quickly cooled to room temperature,
Steel pipe cool time in water is 30 seconds；Then at 690 ± 10 DEG C, after tempering insulation time 130min, air cooling, to room temperature, obtains
The seamless steel pipe of embodiment 2.
Measuring the size of any 10 seamless steel pipes of embodiment 2, measurement result is shown in Table 7；According to " product made from steel power
Learn the standard method of performance test and definition " in the method for regulation any two seamless steel pipes of embodiment 2 are carried out stretching examination
Testing and impact test, result of the test is shown in Table 8.
Table 7
Table 8
By the data in table 7 it can be seen that the dimensional accuracy of product is within the scope of standard-required, it is fully able to meet
The requirement of 150ksi grade of steel；By the data in table 8 it can be seen that the yield strength of steel pipe of embodiment 2, hot strength, elongation
The most quite or the highest, especially low-temperature impact work is the most excellent for rate, low-temperature impact work and the proposed standard of 150ksi grade of steel
In standard-required, therefore, the stretching of seamless steel pipe, impact flexibility that the manufacture method of employing the application obtains are the most excellent,
The exploitation requirement of deep-well, ultradeep well oil gas field can be suitable for.
Embodiment 3
(1) smelting of blank
According to giving up that the ratio interpolation molten iron of 700kg/t and the ratio of 300kg/ are added production well pipe kind and produced
Steel, as raw material, through 45 tons of electric furnace smeltings, 45 tons of refining furnace refines, and adds according to following ratio in smelting process:
4kg/t ferrosilicon, 17kg/t low-carbon ferromanganese, 2.0kg/t vanadium iron, 10kg/t chromic carbide iron, 6kg/t molybdenum-iron and a small amount of aluminium wire and titanium
Ferrum, uses 45 tons of vacuum degassing furnace techniques to carry out the vacuum metling of molten steel above-mentioned raw materials；Then feed calcium line and carry out Calcium treatment, so
Rear employing circle base circular-arc type continuous casting machine carries out continuous casting；In above process, refining furnace ladle bull ladle liquid steel temperature=liquidus curve is controlled
Temperature+(70～100) ± 10 DEG C；Baking of tundish 3 hours, baking temperature more than 1100 DEG C；Casting speed controls at 0.50m/
min；Frequency of vibration adjusting range 180opm of crystallizer, amplitude adjusting range ± 2～4mm, side-play amount adjusting range 10～
30%；Crystallizer cooling water inflow controls: 4500L/min.After blank is cut scale, carry out slow cooling.In detection blank, each chemistry becomes
The content divided, testing result is shown in Table 9.
Table 9
| Element | C | Si | Mn | P | S | Cr | Mo | Ni |
| Content (wt%) | 0.21 | 0.27 | 0.43 | 0.004 | 0.0008 | 0.79 | 0.67 | 0.02 |
| Element | V | Al | ||||||
| Content (wt%) | 0.27 | 0.013 |
(2) steel pipe rolling
The heating of blank: useBlank produces, and blank heating cycle according to table 10 in annular furnace is carried out
Heating.
Table 10
Cone-type piercer: preparationDuring oil gas seamless steel pipe, carry out at piercing temperature is 1200 DEG C
Cone-type piercer, blank diameter total reduction is 11%, and roll spacing is 296.6mm, and roll feed angle is 11 °, and roll roll off angle is
15 °, obtaining dimensions isHollow billet.
Rolling: employing pass isMPM Tube Rolling Train above-mentioned hollow billet is rolled, the feed quantity of hollow billet exists
40mm, roll rotational speed controls between 25rpm, and blast controls 4.5～6bar, obtains specification and isHollow forging.
Hot size: by the hollow forging after de-rod after step-by-step movement reheating furnace is heated to 940 DEG C, by the water under high pressure of 17MPa
Dephosphorization apparatus, 12 framves mutually against and the three-roll sizing mill frame of tandem on carry out continuous rolling process, prepared specification isPipe.
(3) heat treatment
Steel pipe is heated to 920 ± 10 DEG C, and temperature retention time 100min, and employing shrend of coming out of the stove subsequently is quickly cooled to room temperature,
Steel pipe cool time in water is 30 seconds；Then at 690 ± 10 DEG C, after tempering insulation time 130min, air cooling, to room temperature, obtains
The seamless steel pipe of embodiment 3.
Measuring the size of any 10 seamless steel pipes of embodiment 3, measurement result is shown in Table 11；According to " product made from steel
The standard method of mechanical property test and definition " in regulation method any two seamless steel pipes of embodiment 3 are stretched
Test and impact test, result of the test is shown in Table 12.
Table 11
Table 12
By the data in table 11 it can be seen that the dimensional accuracy of product is within the scope of standard-required, it is fully able to meet
The requirement of 150ksi grade of steel；By the data in table 12 it can be seen that the yield strength of steel pipe of embodiment 3, hot strength, elongation
Quite or the highest, especially low-temperature impact work is far superior to mark for rate, low-temperature impact work and the proposed standard of 150ksi grade of steel
Alignment request, therefore, the stretching of seamless steel pipe, impact flexibility that the manufacture method of employing the application obtains are the most excellent, it is possible to
It is suitable for the exploitation requirement of deep-well, ultradeep well oil gas field.
Embodiment 4
(1) smelting of blank
According to giving up that the ratio interpolation molten iron of 700kg/t and the ratio of 300kg/ are added production well pipe kind and produced
Steel, as raw material, through 45 tons of electric furnace smeltings, 45 tons of refining furnace refines, and adds according to following ratio in smelting process:
5kg/t ferrosilicon, 23kg/t low-carbon ferromanganese, 3.0kg/t vanadium iron, 15kg/t chromic carbide iron, 7kg/t molybdenum-iron and a small amount of aluminium wire and titanium
Ferrum, uses 45 tons of vacuum degassing furnace techniques to carry out the vacuum metling of molten steel above-mentioned raw materials；Then feed calcium line and carry out Calcium treatment, so
Rear employing circle base circular-arc type continuous casting machine carries out continuous casting；In above process, refining furnace ladle bull ladle liquid steel temperature=liquidus curve is controlled
Temperature+(70～100) ± 10 DEG C；Baking of tundish 3 hours, baking temperature more than 1100 DEG C；Casting speed controls at 0.50m/
min；Frequency of vibration adjusting range 180opm of crystallizer, amplitude adjusting range ± 2～4mm, side-play amount adjusting range 10～
30%；Crystallizer cooling water inflow controls: 4500L/min.After blank is cut scale, carry out slow cooling.In detection blank, each chemistry becomes
The content divided, testing result is shown in Table 13.
Table 13
(2) steel pipe rolling
The heating of blank: useBlank produces, and blank heating cycle according to table 14 in annular furnace is carried out
Heating.
Table 14
Cone-type piercer: preparationDuring oil gas seamless steel pipe, carry out at piercing temperature is 1200 DEG C
Cone-type piercer, blank diameter total reduction is 11%, and roll spacing is 296.6mm, and roll feed angle is 11 °, and roll roll off angle is
15 °, obtaining dimensions isHollow billet.
Rolling: employing pass isMPM Tube Rolling Train above-mentioned hollow billet is rolled, the feed quantity of hollow billet exists
30mm, roll rotational speed controls between 52rpm, and blast controls 4.5～6bar, obtains specification and isHollow forging.
Hot size: by the hollow forging after de-rod after step-by-step movement reheating furnace is heated to 940 DEG C, by the water under high pressure of 17MPa
Dephosphorization apparatus, 12 framves mutually against and the three-roll sizing mill frame of tandem on carry out continuous rolling process, prepared specification isPipe.
(3) heat treatment
Steel pipe is heated to 920 ± 10 DEG C, and temperature retention time 90min, and employing shrend of coming out of the stove subsequently is quickly cooled to room temperature, steel
In Guan Shui, cool time is 30 seconds；Then at 690 ± 10 DEG C, after tempering insulation time 120min, air cooling, to room temperature, obtains reality
Execute the seamless steel pipe of example 3.
Measuring the size of any 10 seamless steel pipes of embodiment 4, measurement result is shown in Table 15；According to " product made from steel
The standard method of mechanical property test and definition " in regulation method any two seamless steel pipes of embodiment 4 are stretched
Test and impact test, result of the test is shown in Table 16.
Table 15
Table 16
By the data in table 15 it can be seen that the dimensional accuracy of product is within the scope of standard-required, it is fully able to meet
The requirement of 150ksi grade of steel；By the data in table 16 it can be seen that the yield strength of steel pipe of embodiment 4, hot strength, elongation
Quite or the highest, especially low-temperature impact work is far superior to mark for rate, low-temperature impact work and the proposed standard of 150ksi grade of steel
Alignment request, therefore, the stretching of seamless steel pipe, impact flexibility that the manufacture method of employing the application obtains are the most excellent, it is possible to
It is suitable for the exploitation requirement of deep-well, ultradeep well oil gas field.
Embodiment 5
(1) smelting of blank
According to giving up that the ratio interpolation molten iron of 700kg/t and the ratio of 300kg/ are added production well pipe kind and produced
Steel, as raw material, through 45 tons of electric furnace smeltings, 45 tons of refining furnace refines, and adds according to following ratio in smelting process:
3kg/t ferrosilicon, 12kg/t low-carbon ferromanganese, 1.7kg/t vanadium iron, 8.5kg/t chromic carbide iron, 4.5kg/t molybdenum-iron and a small amount of aluminium wire and
Ferrotianium, uses 45 tons of vacuum degassing furnace techniques to carry out the vacuum metling of molten steel above-mentioned raw materials；Then feed calcium line and carry out Calcium treatment,
Then circle base circular-arc type continuous casting machine is used to carry out continuous casting；In above process, refining furnace ladle bull ladle liquid steel temperature=liquid phase is controlled
Line temperature+(70～100) ± 10 DEG C；Baking of tundish 3 hours, baking temperature more than 1100 DEG C；Casting speed controls
0.50m/min；Frequency of vibration adjusting range 180opm of crystallizer, amplitude adjusting range ± 2～4mm, side-play amount adjusting range
10～30%；Crystallizer cooling water inflow controls: 4500L/min.After blank is cut scale, carry out slow cooling.Detection blank is respectively changed
The content studied point, testing result is shown in Table 17.
Table 17
| Element | C | Si | Mn | P | S | Cr | Mo | Ni |
| Content (wt%) | 0.21 | 0.20 | 0.30 | 0.012 | 0.003 | 0.70 | 0.50 | 0.10 |
| Element | V | Al | ||||||
| Content (wt%) | 0.210 | 0.01 |
(2) steel pipe rolling
The heating of blank: useBlank produces, and blank heating cycle according to table 18 in annular furnace is carried out
Heating.
Table 18
Cone-type piercer: preparationDuring oil gas seamless steel pipe, carry out at piercing temperature is 1200 DEG C
Cone-type piercer, blank diameter total reduction is 11%, and roll spacing is 296.6mm, and roll feed angle is 11 °, and roll roll off angle is
15 °, obtaining dimensions isHollow billet.
Rolling: employing pass isMPM Tube Rolling Train above-mentioned hollow billet is rolled, the feed quantity of hollow billet exists
100mm, roll rotational speed controls between 22rpm, and blast controls 4.5～6bar, obtains specification and isFamine
Pipe.
Hot size: by the hollow forging after de-rod after step-by-step movement reheating furnace is heated to 940 DEG C, by the water under high pressure of 17MPa
Dephosphorization apparatus, 12 framves mutually against and the three-roll sizing mill frame of tandem on carry out continuous rolling process, prepared specification isPipe.
(3) heat treatment
Steel pipe is heated to 920 ± 10 DEG C, and temperature retention time 120min, and employing shrend of coming out of the stove subsequently is quickly cooled to room temperature,
Steel pipe cool time in water is 30 seconds；Then at 690 ± 10 DEG C, after tempering insulation time 160min, air cooling, to room temperature, obtains
The seamless steel pipe of embodiment 3.
Measuring the size of any 10 seamless steel pipes of embodiment 5, measurement result is shown in Table 19；According to " product made from steel
The standard method of mechanical property test and definition " in regulation method any two seamless steel pipes of embodiment 5 are stretched
Test and impact test, result of the test is shown in Table 20.
Table 19
Table 20
By the data in table 19 it can be seen that the dimensional accuracy of product is within the scope of standard-required, it is fully able to meet
The requirement of 150ksi grade of steel；By the data in table 20 it can be seen that the yield strength of steel pipe of embodiment 5, hot strength, elongation
Quite or the highest, especially low-temperature impact work is far superior to mark for rate, low-temperature impact work and the proposed standard of 150ksi grade of steel
Alignment request, therefore, the stretching of seamless steel pipe, impact flexibility that the manufacture method of employing the application obtains are the most excellent, it is possible to
It is suitable for the exploitation requirement of deep-well, ultradeep well oil gas field.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect:
The yield strength of above-mentioned seamless steel pipe is at more than 1034MPa, and tensile strength is in more than 1150MPa ,-20 DEG C of Charpy V
The horizontal full-scale ballistic work of type is at more than 80J.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made any repaiies
Change, equivalent, improvement etc., should be included within the scope of the present invention.
Claims (10)
1. a high-intensity high-tenacity oil gas seamless steel pipe, it is characterised in that the described seamless steel of high-intensity high-tenacity oil gas
The percentage by weight of the chemical constituent of pipe is C 0.20～0.35%, Si 0.20～0.70%, Mn 0.30～0.80%, P≤
0.012%, S≤0.003%, Cr 0.70～1.50%, Mo 0.50～1.20%, V 0.10～0.50%, Ni≤0.10%,
Al 0.01～0.05%, surplus are ferrum Fe and inevitable impurity.
2. the manufacture method of a high-intensity high-tenacity oil gas seamless steel pipe as claimed in claim 1, it is characterised in that bag
Include following steps:
Step S1, carries out dispensing according to the chemical constituent of the seamless steel pipe of strength high toughness oil gas described in claim 1, obtains
Raw material, and described raw material is carried out smelting obtain blank；
Step S2, carries out rolling to described blank and obtains pipe；And
Step S3, is thermally treated resulting in described strength high toughness oil gas seamless steel pipe to described pipe.
Manufacture method the most according to claim 2, it is characterised in that described in described step S1, the dispensing of raw material includes ferrum
Multiple in water, steel scrap, ferroalloy and aluminum.
Manufacture method the most according to claim 2, it is characterised in that after obtaining described raw material in described step S1, specifically
Including: described raw material is obtained described blank through electric furnace smelting, external refining, vacuum outgas and arc continuous casting.
Manufacture method the most according to claim 4, it is characterised in that during carrying out described arc continuous casting, throwing speed
Degree controls 0.5～0.8m/min；The frequency of vibration of crystallizer is 180～220opm, and amplitude is ± 2～4mm, and side-play amount adjusts
Scope is 10～30%.
Manufacture method the most according to claim 2, it is characterised in that described step S2 includes:
Step S21, by described blank heating to 1250～1280 DEG C, and is incubated 40～50min, obtains hot base；
Step S22, carries out cone-type piercer at 1130～1200 DEG C by described hot base, obtains hollow billet；
Step S23, utilizes pipe mill that described hollow billet is carried out tube rolling, obtains hollow forging；And
Step S24, carries out sizing to described hollow forging and obtains described pipe.
Manufacture method the most according to claim 6, it is characterised in that described step S21 specifically includes:
Described blank is sequentially passed through preheating section heating, I section of heating of heating, II section of heating of heating, III section of heating of heating, heating IV
Duan Jiare, heating V section heating and soaking, the total processing time of described step S21 is more than or equal to 4h, wherein, through described
After preheating section heating, the temperature of described blank reaches 790～810 DEG C, the temperature of described blank after described heating I section is heated
Reaching 820～1000 DEG C, after described heating II section is heated, the temperature of described blank reaches 1090～1150 DEG C, through described
After heating III section of heating, the temperature of described blank reaches 1190～1250 DEG C, described blank after described heating IV section is heated
Temperature reaches 1220～1280 DEG C, and after described heating V section is heated, the temperature of described blank reaches 1230～1280 DEG C, so
After after 1250～1280 DEG C of soaking 40～50min, obtain described hot base.
Manufacture method the most according to claim 6, it is characterised in that the described pipe mill in described step S23 is tandem rolling
Unit, during tube rolling, the feed quantity of described hollow billet is 30～100mm, and the rotating speed of roll is between 22～52rpm, and blast exists
Between 4.5～6bar.
Manufacture method the most according to claim 6, it is characterised in that described step S3 includes:
Step S31, at 910～930 DEG C, quenches to described pipe, cools down after insulation 90～120min；And
Step S32, at 680～700 DEG C, is tempered the pipe after cooling, and after insulation 120～160min, air cooling obtains institute
State strength high toughness oil gas seamless steel pipe.
10. high-intensity high-tenacity oil gas seamless steel pipe as claimed in claim 1 answering in oil-gas mining and transport
With.
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| CN108660377A (en) * | 2018-06-14 | 2018-10-16 | 衡阳华菱钢管有限公司 | The preparation method of seamless steel pipe and seamless steel pipe |
| CN110340147A (en) * | 2019-07-12 | 2019-10-18 | 林州凤宝管业有限公司 | A kind of outer small-caliber seamless steel pipe production method through being less than 60mm |
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| CN112063922A (en) * | 2020-09-02 | 2020-12-11 | 衡阳华菱钢管有限公司 | Steel pipe, preparation method and application thereof |
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Application publication date: 20161207 |