CN109055873A - 140ksi steel grade seamless steel pipe and manufacturing method thereof - Google Patents

140ksi steel grade seamless steel pipe and manufacturing method thereof Download PDF

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Publication number
CN109055873A
CN109055873A CN201811165255.8A CN201811165255A CN109055873A CN 109055873 A CN109055873 A CN 109055873A CN 201811165255 A CN201811165255 A CN 201811165255A CN 109055873 A CN109055873 A CN 109055873A
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Prior art keywords
pipe
steel pipe
steel
less
140ksi
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Inventor
解德刚
王长顺
陈克东
赵波
李应雄
胡斌
孟凡磊
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Angang Steel Co Ltd
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Angang Steel Co Ltd
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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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • B22D13/023—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis the longitudinal axis being horizontal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • 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
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

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  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
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  • Physics & Mathematics (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
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  • Heat Treatment Of Steel (AREA)

Abstract

The invention provides a 140ksi steel grade seamless steel pipe and a manufacturing method thereof, wherein the steel pipe comprises the following components in percentage by weight: c: 0.15% -0.20%, Si: less than or equal to 0.30 percent, Mn: 0.20-0.40%, P: less than or equal to 0.010 percent, S: less than or equal to 0.004%, Cr: 1.20% -1.40%, Mo: 0.80% -1.00%, V: 0.11-0.15%, Ni: 1.00-3.00%, Ti: 0.02% -0.05%, B: 0.0005% -0.0040%, Als: 0.01% -0.05%, H: less than or equal to 0.0002 percent, N: less than or equal to 0.0050%, O: less than or equal to 0.0022 percent, and the balance of Fe and inevitable impurities. The manufacturing method comprises smelting, pipe blank manufacturing, steel pipe forming and straightening, the steel pipe manufactured by the invention has the performance characteristic that the ratio of impact energy to yield strength is more than 0.1, and the safety of the seamless steel pipe with 140ksi high-strength grade in the use environment such as oil-gas wells can be greatly improved.

Description

A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method
Technical field
The invention belongs to manufacture field of low alloy steel, more particularly to high-strength seamless steel pipe and its manufacture with high tenacity Method.
Background technique
With global crude oil, the exploitations a large amount of year by year of natural gas, the exploitation of superficial oil reservoir has been unable to meet increasingly increased The drilling depth of huge demand, petroleum-gas fiedl is constantly being deepened, and the drilling depth in some places is up to six, seven kms, even more It is deep.With the increase of well depth, geological conditions becomes complicated and harsh, in addition high temperature, high pressure subsurface environment, to oil well pipe By force, more stringent requirements are proposed for tough performance, and API highest grade of steel Q125 seamless steel pipe has been unable to meet these deep-wells, ultradeep well Requirement.Currently, be badly in need of yield strength in 125ksi or more, and impact flexibility it is matched there is low notch sensitivity Superhigh intensity oil well pipe.
In general, the more high then toughness of the intensity of steel is lower, the two growth and decline each other, according to fracture mechanics strength theory, Allow that the critical dimension of existing tiny flaw and the ratio between KIC and σ y's is square related in oil well pipe, i.e. oil well pipe intensity is got over Height needs matched toughness also higher, and the technical guide of British Department of Energy shows the Charpy v-notch CVN when steel pipe When the ratio between (unit J) and yield strength (units MPa) are more than or equal to 0.1, the notch sensitivity of steel pipe just can guarantee the peace used Entirely, i.e., yield strength is greater than the oil well pipe of 140ksi (980MPa), need to match the Charpy v-notch CVN of 98J or more, and mesh Preceding most seamless steel pipes existing in the market, are all difficult to reach the requirement.
In existing disclosed technology:
Invention " a kind of deep-well, ultradeep well casing " (application number: its ingredient master of casing disclosed in 200310107074.7) The chrome molybdenum steel alloy design of carbon in using: C=0.20~0.30%, Si=0.15~0.40%, Mn=0.30~ 1.20%, Cr=0.50~1.50%, Mo=0.40~1.20%, V=0~0.15%.By electric furnace steel making+continuous cast round billets+ The manufacture of the techniques such as heating+hot centering+perforation, tandem rolling, sizing, yield strength reach 140ksi, but due to using piercing process system Tubing, easily formation banded structure, damage toughness, do not add the Ni element for having huge help to toughness in alloy actively in addition, The matched Charpy v-notch CVN of institute only can guarantee 40J, farther out apart from the Charpy v-notch CVN value that safety value is 98J, tough Property is obviously undesirable, and safety in utilization is lower.
Invention " a kind of superhigh intensity oil well casing " (application number: Chinese patent 200810052521.6) is mentioned, Mainly designed by the alloy of middle carbon, high Cr-Mo-V: C=0.22~0.40%, Si=0.17~0.35%, Mn=0.45~ 0.60%, Cr=0.95~1.10%, Mo=0.70~0.80%, Al=0.015~0.040%, Ni=0.05~ 0.20%, Cu=0.07~0.20%, V=0.070~0.100%.Pass through the perforation of solid round billet plus rolling, sizing, pipe processing It manufactures, yield strength reaches 150ksi, but since using piercing process manufacture pipe, easily formation banded structure, attacking material is tough Property, alloy is less than in addition, and the matched Charpy v-notch CVN of institute also only can guarantee 80J, apart from ideal 104J There is certain gap.
Invention " there is high-intensitive and high toughness petroleum casing pipe and its manufacturing method " (application number: 200910068676.3) Disclosed ultradeep well casing, mainly the chrome-molybdenum steel of carbon adds the alloy of vanadium to design in use: C=0.16~0.28%, Si=0~ 0.50%, Mn=0.30~1.10%, Cr=0.50~1.10%, Mo=0.60~0.95%, Al=0.015~ 0.060%, Cu=0.05~0.25%, V=0.060~0.20%, B=0~0.0050%.By steel scrap plus blast-melted Quenching, the tempering process manufacture of process for making+continuous cast round billets+perforation, tandem rolling, sizing+offline, but due to equally using perforation Technique manufacture pipe, easily formation banded structure, attacking material toughness, alloy is less than in addition, matching Charpy v-notch CVN's Value can guarantee 100J, still fail the safety value for reaching ideal 110J.
Invention " petroleum casing pipe and its production method with high-strength tenacity " (application number: 200810053446.5) open Petroleum casing pipe mainly use in carbon, high chrome molybdenum alloy design: C=0.22~0.35%, Si=0.17~0.30%, Mn= 0.45~0.60%, Cr=0.80~1.10%, Mo=0.70~1.10%, Al=0.015~0.040%, V=0.070~ 0.100%.It is produced by oil quenching, though obtaining good toughness and tenacity, is examined from production efficiency, energy-saving and environmental protection and safety Consider, still there is obvious drawback.
Summary of the invention
It is an object of the invention to overcome the above problem and Charpy v-notch CVN that is insufficient and providing a kind of steel pipe and bend Intensity ratio is taken more than or equal to 0.1, can satisfy the 140ksi steel that petroleum-gas fiedl deep-well and ultradeep well safe working need tubing Grade seamless steel pipe and its manufacturing method.
What the object of the invention was realized in:
It is excellent from alloying element screening and proportion, degree of purity control, technique to solve the matched problem of super-high strength steel pipe toughness Change and carried out largely and the experimental study of system with several aspects such as parameter selection, organization optimizations, this can be met by finally having determined Goal of the invention alloying element is with when manufacturing process.
A kind of 140ksi grade of steel seamless steel pipe, the ingredient of the steel pipe are as follows by weight percentage: C:0.15%~ 0.20%, Si :≤0.30%, Mn:0.20%~0.40%, P :≤0.010%, S :≤0.004%, Cr:1.20%~ 1.40%, Mo:0.80%~1.00%, V:0.11%~0.15%, Ni:1.00%~3.00%, Ti:0.02%~ 0.05%, B:0.0005%~0.0040%, Als:0.01%~0.05%, H :≤0.0002%, N :≤0.0050%, O: ≤ 0.0022%, remaining is Fe and inevitable impurity.
Steel pipe ingredient design reason of the present invention is as follows:
C: the main function of carbon is to improve the carbide that other total elements are formed in harden ability, with steel to can be improved by force Degree, carbon content are lower than 0.15%, and the harden ability and intensity of steel are difficult to ensure, but carbon can play destruction to the toughness of steel and make With carbon is higher than 0.20% guarantee for being unfavorable for toughness.
Si: silicon has been mainly deoxidation herein, but rises and damage to toughness larger, therefore is limited to 0.3% or less.
Mn: harden ability can be improved in manganese, is combined into MnS with the S element in steel, can be to avoid the hot short generation of steel, together When Mn can expand the austenitic area of steel, crystal grain can be refined, play the role of the obdurability for improving steel, content is lower than 0.2% Shi Zuoyong is unobvious, when content is more than 0.4%, harmful element is promoted to start obviously, it is strong to reduce superelevation in the effect of crystal boundary segregation The toughness of oil well pipe steel.
P: phosphorus increases ductile-brittle transition temperature, reduces the toughness of steel, must be limited to 0.010% here in cyrystal boundary segregation Below.
S: sulphur easily formed with manganese etc. it is non-rigid be mingled with, extensional occurs along rolling direction in process, destroys material Expect the continuity of matrix, reduces steel pipe Charpy v-notch toughness index.Here 0.004% or less must be limited to.
Cr: chromium improves harden ability, improves the obdurability of steel, and have anti-corrosion effect, toughness and intensity when being lower than 1.20% Deficiency, when being higher than 1.40%, effect is unobvious, and the chromium of higher amount will increase steel belt roof bolt brittleness.
Mo: molybdenum improves harden ability, improves steel belt roof bolt drag, inhibits temper brittleness, and Grain refinement is obvious, to changing The obdurability effect of kind steel is larger, and content is lower than 0.80%, and obdurability is difficult to meet the requirements, and is higher than 1.00% declines, Increased costs.
V: vanadium forms C, N compound, has the function of refining crystal grain, improves intensity, can improve the obdurability of steel, content is low Obdurability does not reach requirement when 0.11%, and effect is unobvious when being higher than 0.15%.
Ni: nickel is the important alloying element added in steel of the invention, and addition nickel can promote commutative Banach aglebra in steel, is dropped Low ductile-brittle transition temperature.Nickel still most strong one of among the austenite stabilizing elements, can be improved the harden ability and structural homogenity of steel. Reaching the purpose of the present invention, the additive amount of nickel is at least 1.0%, simultaneously as nickel expensive, scarcity of resources, in this hair The upper limit of bright middle regulation nickel content is 3.0%.
Ti: the affinity of titanium and nitrogen is very strong, can fix the nomadic nitrogen in steel, improves the toughness of steel, meanwhile, titanium with Carbon, the nitride that carbon, nitrogen are formed can play the role of refinement crystal grain, improve obdurability, but when content of titanium is higher than 0.05% is made With content range 0.02%~0.05% that is unobvious, therefore limiting titanium in the present invention.
B: boron can reduce segregation concentration of the carbon atom on crystal boundary in steel, effectively inhibit the analysis of pro-eutectoid ferrite Out, and it is less to bainite, martensite transfor mation postponement, effectively strengthen the harden ability of also strong raising steel while crystal boundary, but contain The too high stability for influencing toughness and tenacity of amount, therefore 0.0005%~0.0040% is limited in the present invention.
Als: on the one hand aluminium is added as strong deoxidier, on the other hand can refine crystal grain, improves the toughness of steel, and acid is molten in steel Effect is insufficient when aluminium content is lower than 0.01%, has been saturated higher than 0.05% effect, and starts to damage the high temperature obdurability of steel.
H, O, N: as pernicious gas element, otherwise need to limit its content in steel influences toughness for hydrogen, oxygen, nitrogen.
The two of technical solution of the present invention are to provide a kind of manufacturing method of 140ksi grade of steel seamless steel pipe, including smelting-pipe Base manufacture-steel pipe forming-aligning-flaw detection,
(1) the smelting of steel
Using smelting Technology for Clean Steel, molten iron pretreatment+converter smelting+LF refining+vacuum outgas smelting process route, Molten iron pretreatment, the sulfur content in molten iron is controlled to 0.005% hereinafter, preferably control guarantee to 0.002% or less it is high-quality low Sulphur molten iron is supplied to converter, and converter answers oxygen blast gas smelting molten steel using top, bottom, controls P, S, O, N, H and As, Sn, Pb, Sb, Bi The content of equal harmful elements, wherein the time of LF refining is not less than 30min, and vacuum outgas adds the time of Argon gas agitating to be not less than 10min；
(2) pipe manufactures
For the obdurability for improving material matrix, hollow pipe is produced using centrifugal casting mode, preferably in horizontal rotation The hollow pipe of centrifuge upper；
(3) steel pipe forming
It is handled after hollow heating of pipe blank by the direct tube rolling of MPM/PQF Continuous mill train, control cooling, reheating samming, is micro- It is tension size-reducing mill group sizing, air-cooled.Wherein 1150~1200 DEG C of the heating temperature of pipe, hot continuous rolling temperature are not less than 1000 DEG C, the cooling beam that obtains of control strengthens the quenching structure that martensite accounts for 90% or more surplus as lower bainite, reheats soaking temperature 600~680 DEG C.
Steel pipe uses the band temperature correction not less than 400 DEG C straight after sizing.
Steel pipe after aligning is also needed by flaw detection.
The beneficial effects of the present invention are:
(1) there is following performance: yield strength: 980~1120MPa using seamless steel pipe produced by the present invention；Tension is strong Degree: >=1040MPa；Impact flexibility: full-scale Charpy-V impact power (0 DEG C) >=120J；Elongation percentage >=19%
(2) performance characteristics that using steel pipe produced by the present invention there is the ratio between ballistic work and yield strength to be greater than 0.1, can To greatly increase safety of the seamless steel pipe of 140ksi high intensity levels in the use environments such as oil/gas well.
(3) pipe of present invention process manufacture and the manufacturing process of steel pipe are compact, and entire manufacturing process is accomplished without any letup, and is improved Production efficiency shortens the production cycle, reduces economic cost and time cost.
Specific embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention carries out smelting-pipe manufacture-steel pipe forming-aligning-spy according to the component proportion of technical solution Triage is tested,
(1) the smelting of steel
Using smelting Technology for Clean Steel, molten iron pretreatment+converter smelting+LF refining+vacuum outgas smelting process route, Molten iron pretreatment controls the sulfur content in molten iron to 0.005% hereinafter, low-sulfur molten iron is supplied to converter, and converter is using top, bottom Multiple oxygen blast gas is smelted, and wherein the time of LF refining is not less than 30min, and vacuum outgas adds the time of Argon gas agitating to be not less than 10min；
(2) pipe manufactures
Pipe for the obdurability for improving material matrix, invention product is produced using centrifugal casting mode, preferably in level The hollow pipe of centrifuge upper of rotation；
(3) steel pipe forming
Scale required for hollow pipe is cut into enters heating stove heating, by MPM/ after hollow pipe use heating The direct tube rolling of PQF Continuous mill train, control is cooling, reheat samming processing, tiny-tension reducing unit sizing, roll after carry out sky It is cold.Wherein 1150~1200 DEG C of the heating temperature of pipe, hot continuous rolling temperature are not less than 1000 DEG C, and control cooling obtains a Shu Zhuan Martensite accounts for the quenching structure that 90% or more surplus is lower bainite, reheats 600~680 DEG C of soaking temperature.
Steel pipe uses the band temperature correction not less than 400 DEG C straight after sizing.
Steel pipe after aligning also needs to be packed and stored by every inspection such as flaw detection and tube end maching.
The ingredient of steel pipe of the embodiment of the present invention is shown in Table 1.The main technologic parameters of steel pipe of the embodiment of the present invention are shown in Table 2.This hair The performance of bright embodiment steel pipe is shown in Table 3.
The ingredient (wt%) of 1 steel pipe of the embodiment of the present invention of table
Embodiment 1 2 3 4
C 0.15 0.20 0.16 0.18
Si 0.22 0.27 0.25 0.03
Mn 0.37 0.20 0.40 0.32
P 0.005 0.007 0.009 0.008
S 0.003 0.004 0.002 0.002
Cr 1.28 1.21 1.35 1.40
Mo 0.88 0.93 0.99 0.82
V 0.13 0.11 0.15 0.12
Ni 1.10 2.43 1.72 2.97
Ti 0.04 0.02 0.05 0.03
B 0.0039 0.0026 0.0007 0.0018
Als 0.025 0.011 0.033 0.048
H 0.0002 0.0001 0.0001 0.0002
O 0.0017 0.0020 0.0022 0.0019
N 0.0050 0.0047 0.0049 0.0045
The main technologic parameters of 2 steel pipe of the embodiment of the present invention of table
The performance of 3 steel pipe of the embodiment of the present invention of table
As known from the above, using seamless steel pipe produced by the present invention with following performance: yield strength: 980~ 1120MPa；Tensile strength: >=1040MPa；Impact flexibility: full-scale Charpy-V impact power (0 DEG C) >=120J；Elongation percentage >=19%, There is steel pipe the ratio between ballistic work and yield strength to be greater than 0.1 performance characteristics, can greatly increase 140ksi high intensity levels Safety of the seamless steel pipe in the use environments such as oil/gas well.
In order to state the present invention, explanation appropriately and is being sufficiently carried out to the present invention by embodiment among the above, it is above Embodiment is merely to illustrate the present invention, and not limitation of the present invention, those of ordinary skill in related technical field, not In the case where being detached from the spirit and scope of the present invention, it can also make a variety of changes and modification, made any modification are equally replaced It changes, improve, should all be included in the protection scope of the present invention, scope of patent protection of the invention should be limited by claim It is fixed.

Claims (3)

1. a kind of 140ksi grade of steel seamless steel pipe, which is characterized in that the ingredient of the steel pipe is as follows by weight percentage: C: 0.15%~0.20%, Si :≤0.30%, Mn:0.20%~0.40%, P :≤0.010%, S :≤0.004%, Cr: 1.20%~1.40%, Mo:0.80%~1.00%, V:0.11%~0.15%, Ni:1.00%~3.00%, Ti:0.02% ~0.05%, B:0.0005%~0.0040%, Als:0.01%~0.05%, H :≤0.0002%, N :≤0.0050%, O: ≤ 0.0022%, remaining is Fe and inevitable impurity.
2. a kind of a kind of manufacturing method of 140ksi grade of steel seamless steel pipe described in claim 1, including smelting-pipe manufacture- Steel pipe forming-aligning, it is characterised in that:
(1) smelt
Using smelting Technology for Clean Steel, molten iron pretreatment+converter smelting+LF refining+vacuum outgas smelting process route, molten iron Pretreatment controls the sulfur content in molten iron to 0.005% hereinafter, low-sulfur molten iron is supplied to converter, wherein the time of LF refining Not less than 30min, vacuum outgas adds the time of Argon gas agitating not less than 10min；
(2) pipe manufactures
Hollow pipe is produced using centrifugal casting mode；
(3) steel pipe forming
By the direct tube rolling of Continuous mill train, control cooling, the processing of reheating samming, tiny-tension reducing machine after hollow heating of pipe blank Group sizing, air-cooled；Wherein 1150~1200 DEG C of the heating temperature of pipe, hot continuous rolling temperature are not less than 1000 DEG C, control cooling The quenching structure that 90% or more surplus is lower bainite is accounted for packet martensite, reheats 600~680 DEG C of soaking temperature；
(4) align: steel pipe uses the band temperature correction not less than 400 DEG C straight after sizing.
3. a kind of manufacturing method of 140ksi grade of steel seamless steel pipe according to claim 2, which is characterized in that step (2) In, centrifuge upper hollow pipe of the pipe in horizontal rotation.
CN201811165255.8A 2018-10-08 2018-10-08 140ksi steel grade seamless steel pipe and manufacturing method thereof Pending CN109055873A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112011735A (en) * 2020-08-03 2020-12-01 鞍钢股份有限公司 Economical low-temperature steel pipe with good corrosion resistance and manufacturing method thereof
CN112111694A (en) * 2020-09-07 2020-12-22 鞍钢股份有限公司 Seamless steel pipe for impactor and manufacturing method thereof
CN114836691A (en) * 2022-04-28 2022-08-02 鞍钢股份有限公司 Seamless steel pipe for drilling and production and manufacturing method thereof

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CN102400065A (en) * 2010-09-07 2012-04-04 鞍钢股份有限公司 High-toughness ultrahigh-strength seamless steel pipe for oil well and manufacturing method thereof
CN103160752A (en) * 2011-12-14 2013-06-19 鞍钢股份有限公司 High-strength seamless steel pipe with excellent low-temperature toughness and manufacturing method thereof

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
CN102400065A (en) * 2010-09-07 2012-04-04 鞍钢股份有限公司 High-toughness ultrahigh-strength seamless steel pipe for oil well and manufacturing method thereof
CN103160752A (en) * 2011-12-14 2013-06-19 鞍钢股份有限公司 High-strength seamless steel pipe with excellent low-temperature toughness and manufacturing method thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112011735A (en) * 2020-08-03 2020-12-01 鞍钢股份有限公司 Economical low-temperature steel pipe with good corrosion resistance and manufacturing method thereof
CN112111694A (en) * 2020-09-07 2020-12-22 鞍钢股份有限公司 Seamless steel pipe for impactor and manufacturing method thereof
CN112111694B (en) * 2020-09-07 2021-11-12 鞍钢股份有限公司 Seamless steel pipe for impactor and manufacturing method thereof
CN114836691A (en) * 2022-04-28 2022-08-02 鞍钢股份有限公司 Seamless steel pipe for drilling and production and manufacturing method thereof

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