CN106756605A - A kind of high-strength corrosion-resistant line pipe and its manufacture method - Google Patents

A kind of high-strength corrosion-resistant line pipe and its manufacture method Download PDF

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Publication number
CN106756605A
CN106756605A CN201611145034.5A CN201611145034A CN106756605A CN 106756605 A CN106756605 A CN 106756605A CN 201611145034 A CN201611145034 A CN 201611145034A CN 106756605 A CN106756605 A CN 106756605A
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line pipe
pipe
corrosion
manufacture method
steel
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Inventor
高秋英
郭玉洁
羊东明
张志宏
葛鹏莉
朱原原
肖雯雯
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China Petroleum and Chemical Corp
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China Petroleum and Chemical Corp
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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
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
    • 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
    • C22C38/02—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
    • C22C38/46—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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • 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
    • C21D2211/005—Ferrite
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention provides a kind of high-strength corrosion-resistant line pipe, by weight percentage, including：Cr 15% 18%；Ni 1.5% 6%；Mo 1.5% 3.5%；Si 0.05% 0.8%；Mn 0.05% 0.6%；Al 0.001% 0.1%；N 0.01% 0.05%；At least one in Nb, V, Ti, components range is 0.005% 0.04%, and total amount scope≤0.1%；C≤0.05%；S≤0.003%；P≤0.04%；O≤0.01%；Balance of iron and inevitable impurity.Present invention also offers the preparation method of line pipe, including：Molten steel is made pipe；Pipe is made into hollow forging after annealing, heating；Hollow forging is made line pipe by Q-tempering heat treatment.Line pipe intensity of the invention is high, resistance to corrosion strong, can be used for oil gas field high containing CO2, a small amount of H2The conveying of S media.

Description

A kind of high-strength corrosion-resistant line pipe and its manufacture method
Technical field
The invention belongs to oil, natural-gas transfer pipeline technical field, and in particular to a kind of high-strength corrosion-resistant line pipe And its manufacture method.
Background technology
With the increasing of China's oil construction of natural gas fields dynamics, height contains CO2, a small amount of H2S、Cl-Etc. the severe corrosive oil for coexisting The exploitation quantity of gas resource is on the increase, and its gathering system all suffers from serious CO2-H2S-Cl-Etching problem, what corrosion was caused Harm and influence are increasingly protruded.Such as refined carat gas field gathering line CO2Content is between 1.27%~3.55%, Ge Bieda 6.63%, containing a small amount of H2S, total salinity between 100000mg/l~120000mg/l, stratum water Cl-Content is between 66000mg/l ~74000mg/l, with corrosive environment it is severe, corrosion mechanism is complicated the features such as.And metal material is refined carat gas field mainly uses Material, etching problem is protruded under the corrosive environment system.
For CO2-H2S-Cl-The corrosive environment for coexisting, conventional way is to select the product of high alloy anticorrosive to meet Requirement, such as austenite-ferrite two phase stainless steel, nickel-base alloy, this high alloy high cost, in the bar of current low oil price Under part, economy is poor.So researching and developing the material of Eco-power high-strength corrosion-resistant tubing, corrosion-resistant pipe can be greatly lowered Material cost, saves the consumption of precious metal, meets conservation-minded society's policy that country is advocated, therefore, high-strength corrosion-resistant is opened Hair is significant to the conveying of petroleum resources.
At present, the Patents of high-strength corrosion-resistant line pipe are less, and patent CN200480031927.6 proposes a kind of resistance to The excellent double-strength pipe spool stainless steel of corrosivity.Its composition characteristics is to contain C：More than 0.001%, less than 0.015%, Si： More than 0.01%, less than 0.5%, Mn：More than 0.1%, less than 1.8%, Cr：More than 15.5%, less than 18%, Ni：0.5% with Upper, less than 5.5%, Mo：More than 0.5%, less than 3.5%, V：More than 0.02%, less than 0.2%, N：More than 0.001%, Less than 0.015%, processed by implementing quenching+tempering, can obtain with using tempered martensite body phase as base phase, it is super with YS The intensity of 413MPa being crossed, even if also, under the harsh corrosive environment containing 200 DEG C of high temperature such as CO2, Cl-, can also show excellent Good resistance to CO2 corrosivity.The patent improves decay resistance by low-carbon (LC), the method for adding a large amount of alloying elements, but due to Ni, The alloy contents such as Mo are high, and cost is higher than carbon steel pipe.
The content of the invention
Goal of the invention of the invention is for defect present in prior art, there is provided a kind of high-strength corrosion-resistant pipeline Pipe and its manufacture method.
In a first aspect, the invention provides a kind of high-strength corrosion-resistant line pipe, by weight percentage, including：
Cr 15%-18%；
Ni 1.5%-6%；
Mo 1.5%-3.5%；
Si 0.05%-0.8%；
Mn 0.05%-0.6%；
Al 0.001%-0.1%；
N 0.01%-0.05%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.1%；
C≤0.05%；
S≤0.003%；
P≤0.04%；
O≤0.01%；
Balance of iron and inevitable impurity.
Foregoing high-strength corrosion-resistant line pipe, by weight percentage, including：
Cr 15%-18%；
Ni 2%-5%；
Mo 2%-3%；
Si 0.05%-0.5%；
Mn 0.05%-0.5%；
Al 0.001%-0.05%；
N 0.015%-0.04%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.08%；
C≤0.03%；
S≤0.002%；
P≤0.025%；
O≤0.005%；
Balance of iron and inevitable impurity.
Foregoing high-strength corrosion-resistant line pipe, by weight percentage, also including the Cu of 0-3% (preferably 0.5-2%) And/or 0-2% (0.3-1%) W.
Foregoing high-strength corrosion-resistant line pipe, the line pipe has tempered martensite-ferrite dual phase tissue, its In, the volumn concentration of ferritic phase is 10%-25%, preferably 11-18%.
Second aspect, the invention provides the manufacture method of foregoing high-strength corrosion-resistant line pipe, including：
(1) molten steel is made pipe, wherein, by weight percentage, molten steel includes：
Cr 15%-18%；
Ni 1.5%-6%；
Mo 1.5%-3.5%；
Si 0.05%-0.8%；
Mn 0.05%-0.6%；
Al 0.001%-0.1%；
N 0.01%-0.05%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.1%；
C≤0.05%；
S≤0.003%；
P≤0.04%；
O≤0.01%；
Balance of iron and inevitable impurity；
(2) pipe is made into hollow forging after annealing, heating；
(3) hollow forging is made line pipe by quenching-tempering heat treatment.
Foregoing manufacture method, in step (2), pipe is annealed at 600-750 DEG C, and 1100- is heated to afterwards 1250 DEG C and kept for 1-2 hours, be subsequently formed into hollow forging.
Foregoing manufacture method, in step (3), 900-1020 DEG C is heated to by hollow forging, is quenched after being kept for 1-3 hours, Then it is tempered at 500-650 DEG C, tempering insulation time is preferably more than 2 hours.
Foregoing manufacture method, in step (3), is quenched by the way of water-cooled.
Foregoing manufacture method, in step (1), by weight percentage, the molten steel includes：
Cr 15%-18%；
Ni 2%-5%；
Mo 2%-3%；
Si 0.05%-0.5%；
Mn 0.05%-0.5%；
Al 0.001%-0.05%；
N 0.015%-0.04%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.08%；
C≤0.03%；
S≤0.002%；
P≤0.025%；
O≤0.005%；
Balance of iron and inevitable impurity.
Foregoing manufacture method, in step (1), by weight percentage, the molten steel also includes 0-3% (preferably 0.5- 2%) Cu and/or 0-2% (0.3-1%) W.
The high-strength corrosion-resistant line pipe and its manufacture method provided compared to prior art, the present invention at least have as follows Beneficial effect：
(1) it is mainly to constitute phase that the high-strength corrosion-resistant line pipe that the present invention is provided has tempered martensite-ferrite Duplex structure, possesses excellent anti-CO2-H2S-Cl-Corrosive nature.
(2) manufacture method of the high-strength corrosion-resistant line pipe that the present invention is provided is not required to by cold working operation, it is only necessary to Can reach the intensity of line pipe by simple quenching-tempering heat treatment and be equal to X80 steel.
Brief description of the drawings
Fig. 1 is 2205 steel experiment lacing film macro morphology, and a is the pattern in gas phase, and b is the pattern in liquid phase.
Fig. 2 is research and development line pipe experiment lacing film macro morphology, and a is the pattern in gas phase, and b is the pattern in liquid phase.
Specific embodiment
Technical scheme is described in detail by specific implementation method below, it is to be understood that Technical scheme is not limited to that.
According to the first aspect of the invention, the invention provides a kind of high-strength corrosion-resistant line pipe, by weight percentage Meter, including：
Cr 15%-18%；
Ni 1.5%-6%；
Mo 1.5%-3.5%；
Si 0.05%-0.8%；
Mn 0.05%-0.6%；
Al 0.001%-0.1%；
N 0.01%-0.05%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.1%；
C≤0.05%；
S≤0.003%；
P≤0.04%；
O≤0.01%；
Balance of iron and inevitable impurity.
Preferably, high-strength corrosion-resistant line pipe of the invention includes：
Cr 15%-18%；
Ni 2%-5%；
Mo 2%-3%；
Si 0.05%-0.5%；
Mn 0.05%-0.5%；
Al 0.001%-0.05%；
N 0.015%-0.04%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.08%；
C≤0.03%；
S≤0.002%；
P≤0.025%；
O≤0.005%；
Balance of iron and inevitable impurity.
Preferably, high-strength corrosion-resistant line pipe of the invention also Cu and/or 0- including 0-3% (preferably 0.5-2%) 2% (0.3-1%) W.
The Design Mechanism of above-mentioned line pipe composition is as follows：
Cr is the important element of raising corrosion resisting property in steel, even if the addition of Cr causes the surface of material in atmosphere Corrosion resistant passivating film can be quickly formed, CO of the line pipe under high temperature resistant environment is improved2Corrosive nature.It is excellent in order to obtain Resistance to CO2Corrosive nature, the addition of Cr will reach more than 15% in tubing system of the present invention.On the other hand, the addition of Cr elements More than 18.0, the ferrite of more amount can be formed, the hot-working character to product is adversely affected.Therefore, Cr is limited in 15- In the range of 18%.
Ni is to expand austenitic area, while the decay resistance and toughness of material are improved, and in welding region, Ni's adds Plus heat affected area and matrix homogeneity can be improved.To obtain the effect, Ni constituent contents are greater than 1.5%.But Ni is also A kind of more valuable alloying element, if while Ni constituent contents occur more than 6% in tissue in material system of the present invention Intensity cannot be reduced by the austenite phase of Heat Treatment Control intensity.Therefore, restriction Ni is in the range of 1.5-6%.And preferably 2-5%.
Mo is the maximally effective element of anti-spot corrosion, to ensure to contain a large amount of Cl-Pitting corrosion resistant performance under environment is, it is necessary to add Mo elements no less than 1.5%, but after Mo contents are more than 3.5%, its risk separated out with compound form between there is metal is right Corrosion resistance is unfavorable.Therefore Mo contents should be controlled in 1.5-3.5%, with 2-3% as more preferably.
Si is the element brought into by deoxidier in steel, when its content is more than 0.8%, is easily occurred around ferritic phase Harmful phases such as intermetallic compound, therefore Si contents should be limited below 0.8%, with less than 0.5% for more preferably, in order to reach compared with Good deoxidation effect by Si, it is necessary to be maintained at more than 0.05%.
Mn is also the element brought into by deoxidier in steel, and after its content is more than 0.6%, can make the toughness of steel reduces, because This needs limitation Mn contents below 0.6%, with less than 0.5% for more preferably, in order to reach preferable deoxidation effect, it is necessary to by Mn It is maintained at more than 0.05%.
After Al is element necessary to steel deoxidation, therefore cannot avoid bringing into completely, but Al content is more than 0.1%, meeting Increase ferrite content so as to reduce intensity, it is therefore desirable to limit Al content below 0.1%, with less than 0.05% for more preferably, In order to reach preferable deoxidation effect, it is necessary to Al is maintained at into more than 0.001%.
N is added in steel can effectively lift the intensity and hardness of steel, it is therefore desirable to add more than 0.01% N, but When N content is more than 0.05%, there is the situation that steel toughness is drastically reduced, it is therefore desirable to limit N content in 0.01-0.05%, With 0.015-0.04% as more preferably.
Nb, V, Ti etc. are important microalloy element, can improve strong by the pinning effect crystal grain thinning of carbide Degree, the addition of microalloy can reduce the carbide such as M23C6 and improve resistance in ferrite and tempered martensite crystal boundary and phase boundary precipitation Corrosive nature, effect cannot be obtained if its content is less than 0.005%.If addition is more than 0.04%, steel is rushed Hit toughness to adversely affect, and the hardness of steel can be improved.The content of Nb, V, Ti is limited in the range of 0.005-0.04%.
Meanwhile, in order to obtain optimal anti-SSC and SCC corrosive powers, the overall control for limiting Nb+V+Ti is meeting Nb+V + Ti≤0.1%.And preferred Nb+V+Ti≤0.08%.
When C content is more than 0.05%, Carbide Precipitation is had in cooling procedure in alloy, have a strong impact under hot environment and resist CO2Performance, therefore C content need to be ensured below 0.05%, with less than 0.03% for more preferably.
S is the harmful element in steel, and it has corrosion resistance, hot-workability, toughness for material etc. and has unfavorable Influence, it is therefore desirable to limit S contents below 0.003%, with less than 0.002% for more preferably.
P is the harmful element in steel, and it has corrosion resistance, toughness for steel etc. and all adversely affects, therefore needs P content is limited below 0.04%, with less than 0.025% for more preferably.
O is the element for reducing steel corrosion resistance and toughness, should strictly limit its content below 0.01%, with 0.005% Below for more preferably.
Cu is the element for improving steel atmospheric corrosion resistance and halophile stress corrosion performance, resistance in reinforcement steel in need When atmospheric corrosion and halophile profit corrosive nature, a certain amount of Cu can be added, but after Cu contents are more than 3%, The hot-workability of steel can be made drastically to be deteriorated, the easy defect such as cracking during production steel pipe.Therefore the content of Cu should be limited in 0- 3%, with 0-2% as more preferably.
W can improve high temperature CO2Local corrosion resistance under environment, when reinforcement this aspect performance in need, can To add a certain amount of W, but after W content is more than 2%, the easily harmful phase such as generation intermetallic compound, therefore the content of W should be limited Make in 0-2%, with 0-1% as more preferably.
According to the second aspect of the invention, the invention provides the manufacture method of above-mentioned high-strength corrosion-resistant line pipe, should Method does not need cold working operation, and directly using simple quenching-tempering heat treatment, the method is specifically included：
(1) by the pouring molten steel ingot with mentioned component, and forge or be rolled into pipe；
(2) pipe is made into hollow forging after annealing, heating；
(3) hollow forging is made line pipe by quenching-tempering heat treatment.
Wherein, in step (2), pipe is annealed at 600-750 DEG C, 1100-1250 DEG C is heated to afterwards and is kept 1-2 hours, subsequent perforated, hot rolling were made hollow forging.
Wherein, in step (3), hollow forging is heated to 900-1020 DEG C, is quenched by the way of water-cooled after being kept for 1-3 hours Fire, is then tempered at 500-650 DEG C, and tempering insulation time is preferably more than 2 hours.
Using element and ratio in first aspect, can make that there is synergy between each component of line pipe, especially Be, in conjunction with second aspect in do not need cold working operation, directly carry out quenching-the method for tempering heat treatment, can obtain With tempered martensite as elementary organization, the separately line pipe containing ferrite and reversed austenite tissue, and line pipe Ferritic volumn concentration in the range of 10-25%, particularly in the range of 11-18%, so that line pipe is 120 High concentration CO more than DEG C2, a small amount of H2S and Cl-There is the characteristic of corrosion-resistant, high intensity and high tenacity in environment.
By the research of inventor, the volumn concentration of ferritic phase is less than 10%, and its decay resistance does not reach the phase Prestige value.When ferritic volumn concentration is more than 25%, its intensity and toughness are reduced, while hot-working character is deteriorated.At this In invention, the above-mentioned element of the creative use of inventor is matched and manufacture method so that ferritic volumn concentration is limited At 10-25% scopes (preferably 11-18%), it is achieved thereby that optimal effect.
In addition, the present invention improve the technological process of production, traditional austenite-ferrite two phase stainless steel be both needed to by cold-drawn/ The cold working means such as cold rolling can reach target strength, and line pipe of the present invention need not carry out cold working, it is only necessary to by letter Single quenching-tempering heat treatment intensity is that can reach to be equal to X80 steel.The present invention reduces production cost, traditional austenite-iron Ferritic double phase stainless steel alloy content is higher, and (Cr contents are generally more than 22%, Ni contents more than 5%), in contrast, of the invention The steel grade can more traditional austenite-ferrite two phase stainless steel steel grade 2205 save Cr, the Ni of 1-2% of 4-6%, reduce Cost of alloy about 17%.
Embodiment
The source of each material to being used in embodiment illustrates below, if not otherwise specified, is used Raw material and instrument are commercially available, are instrument commonly used in the art and raw material, as long as it can meet experiment needs.Under The conventional designation in the entitled this area of steel grade referred in research is stated, those skilled in the art are to understand tool according to steel grade title Which kind of steel body is.
The method of testing used in embodiment is described as follows first：
Tubing Charpy V-type impact absorbing energy (i.e. impact flexibility) is tested：Sampled on pipe, it is 5*10* to take and cut volume 55mm sized samples, by being taken the mean after the standard tests of AGB/T 229, and are converted into 10*10*55 according to API 5CT standards (mm) in table 2, test temperature is respectively 0 DEG C and -20 DEG C to full-scale rank rear.
Ferritic phase volume fraction：After being sampled on steel pipe, the metallographic specimen of surface polishing is made, uses FeCl3+HCl Solution be polished after surface corrosion 10 seconds after, taking-up washes down drying, and surface is entered at random using metallographic microscope (OM) After the tissue of row 500X is taken pictures, drawn using image analysis software.
To the seamless steel pipe for obtaining, welded using the solder of 22CrNi9Mo3, the weld seam to obtaining carries out weld seam punching Hit toughness, corrosion test, SSC experiments and SCC experiments.
Weld seam Charpy V-type impact absorbing energy (i.e. impact flexibility) is tested：Sampled on the weld seam of welded pipe, hot shadow will be welded The center in area is rung as the position of v-notch, and it is 5*10*55mm sized samples to take and cut volume, is examined by the standards of AGB/T 229 Taken the mean after testing, and 10*10*55 (mm) full-scale rank rear is converted into table 2 according to API-5L standards, test temperature is respectively 0 DEG C and -20 DEG C.
CO under corrosion test high temperature2、Cl-Corrosion test coexists：Sample is immersed into liquid in autoclave, temperature is 120 DEG C, CO2Partial pressure is 6MPa, Cl-Concentration is 100000mg/L, and flow rate of liquid is 1m/s, and test period is 240h, before contrast test Sample weight afterwards, calculates uniform corrosion rate.Additionally, the use of enlargement ratio being 10 times for the sample after experiment Stereomicroscope is observed full surface, it was observed that the etch pit of more than 0.2mm has then been designated as spot corrosion, otherwise is then designated as without point Erosion.Result of the test is listed in table 2.
SSC is tested：From the welding tube seam for obtaining, the method A regulations processed in NACE TM0177 standardsConstant load sample, sample includes welding region and mother metal.SSC experiment solution be：The 3.5%NaCl aqueous solution, PH to 3.5 is adjusted by NaAc.Using NOL ring equipment to sample loading 400MPa (555MPa × 72%), the test period is 720h, test temperature is 24 ± 3 DEG C, and experiment uses 10%H2S.After off-test, removal surface corrosion product uses times magnification Rate is that 10 times of stereomicroscope is observed full surface, is as a result listed in table 2.
SCC is tested：From the welding tube seam for obtaining, the 5 × 15 of four-point bending A in the standards of ISO 7539 regulation × 115mm samples, sample includes welded seam area, heat affected area and mother metal.SCC experiment solution be：The 3.5%NaCl aqueous solution, PH to 3.5 is adjusted by NaAc.Tested using autoclave equipment is put into after four-point bending specimen holder loading 555MPa, tried Test temperature 60 C, H2S partial pressures 0.01MPa, CO2Partial pressure 3MPa, the test period is 720h.After off-test, removal surface corrosion is produced Thing is observed full surface using the stereomicroscope that enlargement ratio is 10 times, is as a result listed in table 2.
Embodiment 1
The line pipe that specification is 114.3*9.65 is made using the molten steel with composition in table 1, specific method is as follows：
(1) will be cast ingot with the molten steel of the ingredients listed of table 1, and ingot casting is forged into the circular pipe blank of φ 130mm；
(2) pipe is made annealing treatment at 680 DEG C, and appearance oxide skin is removed to be machined mode；
(3) after heating of pipe blank being maintained into 1.5 hours to 1250 DEG C, the general hot finished steel pipe life such as perforated, hot rolling, sizing Operation is produced, hollow forging is made；
(4) hollow forging that will be made be heated to 960-980 DEG C and keep 30 minutes after, quenched in the way of water-cooled, with 550-680 DEG C of temperature is carried out to each steel grade afterwards, 1 tempering of hour has been kept, in the hope of reaching its best performance level.
Embodiment 2-8
The line pipe that specification is 114.3*9.65 is made using the molten steel with composition in table 1, method is with embodiment 1.
The Technology for Heating Processing and tissue of each steel pipe, behavior pattern are as shown in table 2.
Comparative example 1
The line pipe that specification is 114.3*9.65 is made using the molten steel with composition in table 1, specific method is with implementation Example 1.
Comparative example 2-6
The line pipe that specification is 114.3*9.65 is made using the molten steel with composition in table 1, method is with comparative example 1.
The Technology for Heating Processing and tissue of each steel pipe, behavior pattern are as shown in table 2.
Element or its ratio can be seen that not within the scope of the invention by the contrast of above-described embodiment and comparative example, or Person is provided without the method for the present invention, is unable to reach effect of the invention.
Field test example (Confidential experimental)
The line pipe prepared in embodiment 1 is input into the pipeline of station in refined carat gas production factory YK14 Jing Danjingji carries out scene Confidential experimental.
Refined carat gas production factory YK14 wells production natural gas CO2Content 2.64%, partial pressure 0.81Mpa, H2S contents 14.29mg/ m3, partial pressure 0.00029Mpa；Cl-Content 94202.70mg/l, recovered water is CaCl2Water type.Well head pressure 30.8MPa, temperature 55.0 DEG C, corrosive environment is severe, and corrosion failure risk is higher, and the exploitation middle and later periods, with the rising for managing defeated media water-bearing, corrodes ring Border can be more severe.Simulated according to pipeline corrosive pipeline simulation softward Hydrocor, also confirmed that in 55.0 DEG C of 30.8MPa, temperature In the case of, corrosion rate reaches 1.3mm/a.Therefore the safety of gas gathering network system can in steps must be taken to ensure projected life By property.
(1) indoor corrosion resisting property evaluation
Simulation YK14 wells individual well gathering line corrosive medium and environmental condition, to research and development line pipe and the anti-CO of 2205 steel2、 H2S、Cl-Corrosive power is tested.
The steel of table 3 2205 and Evaluation of Corrosion Resistance uniform corrosion rate result in research and development line pipe room
Lacing film is monitored by Fig. 1, Fig. 2 and Monitoring Data can be seen that:The decay resistance of research and development line pipe and 2205 steel It is close, spot corrosion sign, strip light are showed no in two kinds of test pieces of tubing gas, liquid.Research and development line pipe is in the liquid phase Uniform corrosion rate be 0.0223mm/a, spot corrosion speed is 0.0802mm/a, and uniform corrosion rate in the gas phase is 0.0183mm/a, spot corrosion speed is 0.0645mm/a.2205 steel are compared with research and development line pipe uniform corrosion rate in the liquid phase Drop 13%, spot corrosion speed declines 4.9%, and uniform corrosion rate in the gas phase declines 5.5%, and spot corrosion speed declines 0.2%.
(2) field popularization application
Research and development line pipe and the 2205 same positions of steel matter, same to operating mode, the monitoring of same cycle (30 days) lacing film, evaluate research and development tubing With the corrosion resistance under 2205 steel at the scene operating mode service condition.Monitoring Data is contrasted, 4 are the results are shown in Table.
The steel of table 4 2205 and the corrosion-monitoring data contrast of research and development line pipe field test
According to NACE standards RP-0775-91 to the regulation of extent of corrosion, there is the data analysis of table 4 to understand, in monitoring cycle The uniform corrosion rate and spot corrosion speed of 2205 steel are mild corrosion, and the uniform corrosion rate for researching and developing line pipe is in slightly Corrosion, spot corrosion speed is moderate corrosion.2205 steel decline 11.1%, point compared to research and development line pipe, average homogeneous corrosion rate Corrosion rate declines 10.6%.

Claims (10)

1. a kind of high-strength corrosion-resistant line pipe, it is characterised in that by weight percentage, including：
Cr 15%-18%；
Ni 1.5%-6%；
Mo 1.5%-3.5%；
Si 0.05%-0.8%；
Mn 0.05%-0.6%；
Al 0.001%-0.1%；
N 0.01%-0.05%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.1%；
C≤0.05%；
S≤0.003%；
P≤0.04%；
O≤0.01%；
Balance of iron and inevitable impurity.
2. high-strength corrosion-resistant line pipe according to claim 1, it is characterised in that by weight percentage, including：
Cr 15%-18%；
Ni 2%-5%；
Mo 2%-3%；
Si 0.05%-0.5%；
Mn 0.05%-0.5%；
Al 0.001%-0.05%；
N 0.015%-0.04%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.08%；
C≤0.03%；
S≤0.002%；
P≤0.025%；
O≤0.005%；
Balance of iron and inevitable impurity.
3. high-strength corrosion-resistant line pipe according to claim 1 and 2, it is characterised in that by weight percentage, also wrap Include Cu and/or 0-2% (0.3-1%) W of 0-3% (preferably 0.5-2%).
4. the high-strength corrosion-resistant line pipe according to claim any one of 1-3, it is characterised in that the line pipe has Tempered martensite-ferrite dual phase tissue, wherein, the volumn concentration of ferritic phase is 10%-25%, preferably 11- 18%.
5. the manufacture method of the high-strength corrosion-resistant line pipe described in any one of claim 1-4, it is characterised in that including：
(1) molten steel is made pipe, wherein, by weight percentage, molten steel includes：
Cr 15%-18%；
Ni 1.5%-6%；
Mo 1.5%-3.5%；
Si 0.05%-0.8%；
Mn 0.05%-0.6%；
Al 0.001%-0.1%；
N 0.01%-0.05%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.1%；
C≤0.05%；
S≤0.003%；
P≤0.04%；
O≤0.01%；
Balance of iron and inevitable impurity；
(2) pipe is made into hollow forging after annealing, heating；
(3) hollow forging is made line pipe by quenching-tempering heat treatment.
6. manufacture method according to claim 5, it is characterised in that in step (2), pipe is moved back at 600-750 DEG C Fire, is heated to 1100-1250 DEG C and is kept for 1-2 hours afterwards, is subsequently formed into hollow forging.
7. the manufacture method according to claim 5 or 6, it is characterised in that in step (3), hollow forging is heated to 900- 1020 DEG C, quenched after being kept for 1-3 hours, be then tempered at 500-650 DEG C, it is small that tempering insulation time is preferably more than 2 When.
8. the manufacture method according to claim any one of 5-7, it is characterised in that in step (3), by the way of water-cooled Quenched.
9. the manufacture method according to claim any one of 5-8, it is characterised in that in step (1), by weight percentage Meter, the molten steel includes：
Cr 15%-18%；
Ni 2%-5%；
Mo 2%-3%；
Si 0.05%-0.5%；
Mn 0.05%-0.5%；
Al 0.001%-0.05%；
N 0.015%-0.04%；
At least one in Nb, V, Ti, components range is 0.005%-0.04%, and total amount scope≤0.08%；
C≤0.03%；
S≤0.002%；
P≤0.025%；
O≤0.005%；
Balance of iron and inevitable impurity.
10. the manufacture method according to claim any one of 5-9, it is characterised in that in step (1), by weight percentage Meter, the molten steel also Cu and/or 0-2% (0.3-1%) W including 0-3% (preferably 0.5-2%).
CN201611145034.5A 2016-12-13 2016-12-13 A kind of high-strength corrosion-resistant line pipe and its manufacture method Pending CN106756605A (en)

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