CN108517471A - Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method - Google Patents

Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method Download PDF

Info

Publication number
CN108517471A
CN108517471A CN201810269149.8A CN201810269149A CN108517471A CN 108517471 A CN108517471 A CN 108517471A CN 201810269149 A CN201810269149 A CN 201810269149A CN 108517471 A CN108517471 A CN 108517471A
Authority
CN
China
Prior art keywords
corrosion
manufacturing
pipe
steel
oil well
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810269149.8A
Other languages
Chinese (zh)
Inventor
徐芳泓
方旭东
李阳
夏焱
赵建伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Taiyuan Iron and Steel Group Co Ltd
Original Assignee
Taiyuan Iron and Steel Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Taiyuan Iron and Steel Group Co Ltd filed Critical Taiyuan Iron and Steel Group Co Ltd
Priority to CN201810269149.8A priority Critical patent/CN108517471A/en
Publication of CN108517471A publication Critical patent/CN108517471A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • 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
    • C22C38/02—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
    • C22C38/18—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

The invention discloses a kind of corrosion-resistant super martensitic stain less steel pipes of oil well comprising following compositions are calculated in mass percent：C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S≤0.002%, Cr：12~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~0.3%, surplus is Fe and other impurity.The above-mentioned resistance to CO of pipe2And chloride ion corrosion.The invention also discloses a kind of above-mentioned oil well manufacturing methods of corrosion-resistant super martensitic stain less steel pipe comprising following the step of implementing in order：Smelting, casting and pipe hot-working, wherein smelting includes that top and bottom combined blown converter slightly refines, the decarburization of vacuum oxygen decarburization stove and ladle refining furnace refine, 1530 ± 10 DEG C of cast temperature, and pipe hot-working heating temperature is 1250~1300 DEG C.The oil well of the present invention is with corrosion-resistant super martensitic stain less steel pipe in CO2、Cl Coexisting has excellent intensity and corrosion resistance under corrosive environment and high-temperature and high-pressure conditions.

Description

Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method
Technical field
The present invention relates to stainless steel field more particularly to a kind of oil well corrosion-resistant super martensitic stain less steel pipe and its systems Make method.
Background technology
Energy industry occupies an important position in Chinese national economy, and in China Petroleum in steel total amount, oil Well casing accounts for 40% or more, and the annual investment for oil well pipe accounts for the 1/5 of petroleum industry gross investment.Oil well pipe is in oil work Occupy critically important position in industry, is the basis of petroleum industry.Tubing and casing is technology content and the highest product of added value, together When be also high risk product, huge economic loss can be caused by quality problems once occur in underground, well will be caused to ruin when serious People dies.With the development of petroleum industry, demand and the day of oil well pipe increase severely.In recent years, about 100,000 mouthfuls of the annual drilling well in the whole world Left and right, is more than 600,000 mouthfuls in oil-producing well, needs more than 1,000 ten thousand tons of oil well pipe year.According to China's Statistical data, one meter is often crept into, about Need oil well pipe 62kg, middle sleeve 48kg, oil pipe 10kg, drilling rod 3kg, drill collar 0.5kg.
The status of petroleum pipeline in the oil industry not only shows that dosage is big, investment is big, more important is its quality, Performance and development of oil industry count for much.Oil well pipe service condition is severe, such as tubing string and casing string will usually be born Hundreds of, lotus, the also work of high temperature and harsh corrosive medium are cut out in the interior external pressure of even thousands of a atmospheric pressure, hundreds of tons of stretching With.China is often only drill rod breaking and falls well accident just up to 1000 or so, contracts Business Association statistics according to drilling tool, every drilling rod is disconnected It is exactly 10.6 ten thousand dollars to split the direct average loss of well accident.The damage of drilling rod and casing sometimes results in oil well and scraps.I The cost of state's western part a bite oil well is all several ten million or even more than one hundred million yuans.The service life of casing just determines the service life in oil field. It can be seen that the service life of tubing and casing, safety, economy have important role to petroleum industry.Oil well pipe is in oil In industry, there is very important status, dosage is big, and consumption is high, and quality, performance are great to the influence on development of petroleum industry.
Because the high interests stimulation of the severe situation and oil price of whole world oil supply, causes some harsh The oil gas field of corrosive environment and the oil gas field of other harsh conditions put into exploitation in succession, this makes to some specific uses oil The demand of well casing sharply increases.China is during oil-gas mining, CO2It is present in usually as one of the composition of natural gas In oil gas or with its appearance.Currently, due to noting CO2Enhanced recovery technique (EOR) is widely used in deep layer and contains CO2Gas reservoir is opened In the research of hair and crude oil yield-increasing technology so that be also accompanied by a large amount of CO in the extraction system of crude oil2.In recent years, in oil gas Recovery process in, down-hole string CO often occurs2Fall well accident caused by corrosion, is not only brought to oil-gas field development Great economic loss, while also resulting in certain environmental pollution.CO2Corrosion has become one and global can not be ignored The problem of.Meanwhile being found that gas field, the oil field of high reserves, these oil fields are opened in west areas such as Sichuan, Xinjiang, Yunnan It adopts, encounters CO2、H2S、Cl-The problem that ion coexists, the highest CO of content2It is more than 60,000 ppm, Cl more than 10%, H2S-Ion More than 100,000 ppm, therefore corrode just as containing CO2、H2S and Cl-Environment in the main problem that uses.In order to ensure oil gas The safety of well, it is necessary to use high-alloy steel and stainless steel tube.At present both at home and abroad for containing CO2、H2S and ClMaterial is used under oil well Material, Cr13 types martensitic stain less steel, two phase stainless steel and nickel-base alloy are followed successively by according to the severe degree of environment.So flatly Oil/gas well investment few then thousands of ten thousand, at most more than one hundred million members, wherein cost proportion are maximum to be undoubtedly crude oil extraction and natural gas Casing, oil pipe.Thus, it is necessary to using a large amount of high temperature resistance and containing CO2And a small amount of H2S、Cl-It is more severe In the environment of have the low stainless steel pipe of corrosion resistance, manufacturing cost.
Common 13Cr steel pipes have good corrosion resistance in 100 DEG C of environment below.But when environment temperature is more than 100 DEG C When will appear general corrosion, in CO2Divide corrode under high environment it is even more serious.In addition, in high Cl-Have under mass concentration environment When spot corrosion can occur.
Chinese patent literature CN101397637B discloses a kind of 13Cr high anti-carbon dioxides and trace hydrogen sulfide corrosion oil Casing steel and its manufacturing method, oil annular tube steel chemical composition proportioning are by weight percentage：C：0.01~0.05%, Si：≤ 0.5%, Mn：0.20~1.00%, Cr：12~14%, Mo：1.0~3.0%, Ni：4.0~6.0%, Cu：1.0~ 2.0%, Nb：0.02~0.10%, remaining is Fe and inevitable impurity element, and impurity element total amount is less than 0.05%.It should Invention after electric furnace steel making, molding, hammer cogging, rolling tubulation and rational heat treatment process, can obtain power with steel Learn the anti-corrosion tubing and casings of non-API that performance meets 110 grade of steels.By copper, niobium alloy, the sulfuration resistant of material can be significantly improved Hydrogen stress corrosion cracking performance.But the reinforcings such as Mo, Nb, Cu excessively high in the material reduce the processability of material, add Ni too high levels, lead to high expensive, C content is higher to also reduce the anti-CO of material2Corrosive nature.
Chinese patent literature CN102144041B disclose a kind of pipe for oil well use martensitic stainless steel seamless steel pipe and its Manufacturing method, the martensitic stainless steel seamless steel pipe, which has, is precipitated the tempered martensite group that Nb amounts reach 0.020% or more It knits, the stainless-steel seamless pipe has following composition：In terms of quality %, contain C：0.020% or less, Cr：10~14%, Ni：3% or less, N：0.05% hereinafter, also contain Nb：0.03~0.2%, surplus is made of Fe and inevitable impurity.It should Material C r content ranges are wide, and low C and low Ni contents cause austenite structure stability poor, are easy to form high temperature after hot-working Ferrite makes corrosion resisting property weaken, and toughness deteriorates.
In consideration of it, this field needs to develop a kind of resistance to CO2And the oil well of chloride ion corrosion is stainless with economical super martensite Steel.
Invention content
To solve above-mentioned the technical problems existing in the prior art, the purpose of the present invention is to provide a kind of resistance to CO2, chlorine from Son corrosion and the economical super martensitic stain less steel of high temperature and pressure oil well, cost are less than two phase stainless steel and nickel-base alloy, make With the service life 2 to 3 times are improved than common 13Cr martensitic stain less steels.
It emphasizes herein, it is unless otherwise indicated, the common meaning of various scientific and technical terminologies in terms used herein and this field, each The meaning of technical term defined in kind technology dictionary, textbook etc. is consistent.For example, herein, hp-ht well is usually With General Purpose Rubber sealing performance come what is defined, refer to the well that bottom hole temperature (BHT) is higher than 70MPa higher than 150 DEG C, pressure.Herein, deep Well generally refers to the well that well depth is more than 4500m or 15000ft.Super martensitic stain less steel generally refers to stainless in conventional martensitic On the basis of steel, by the content for reducing carbon content (highest 0.07%), increasing nickel (3.5%~6.5%), parent metal is aobvious Micro-group is woven to the stainless steel of tempered martensite.
To achieve the goals above, present invention improves the ingredient of martensitic stain less steel in the prior art, the present invention is super The composition design thinking of martensitic stain less steel is as follows：Ultralow C content is kept on the basis of 12.5Cr, to ensure corrosion resistance； Adding a certain amount of Ni ensures stabilization of austenite, and improves resistance to CO2Stress corrosion performance；It adds a small amount of Mo and improves anti-spot corrosion Performance；It adds W and V-arrangement and improves intensity at carbide.Ultimately form alloy system： 0.01C—12.5Cr—4.5Ni—1Mo— 0.08V—0.05W。
Therefore, on the one hand, according to an embodiment of the present invention, provide a kind of oil well corrosion-resistant super martensitic stain less steel pipe Base comprising following compositions are calculated in mass percent：C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~ 0.5%, P≤0.015%, S≤0.002%, Cr：12~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~ 0.1%, W：0.1~0.3%, surplus is Fe and other impurity.
Further, the pipe is resistant to CO2And chloride ion corrosion.
On the other hand, according to an embodiment of the present invention, provide a kind of oil well corrosion-resistant super martensitic stain less steel pipe Manufacturing method comprising following the step of implementing in order：Smelting, casting and pipe hot-working,
Wherein, in the smelting step, pretreated molten iron is by slightly refining, after decarburization and refining, the ingredient of molten steel Mass percent, which reaches following ratios, to tap：
C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S≤0.002%, Cr：12~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~0.3%,
Then, molten steel is cast into steel ingot or continuous casting billet.
Further, in the smelting step, pretreated molten iron passes through top and bottom combined blown converter (K-OBM-S) respectively Thick refining, (VOD) decarburization of vacuum oxygen decarburization stove and ladle refining furnace (LF) refining；When top and bottom combined blown converter slightly refines, bottom blowing is complete Journey is for N2Reduction, and reach requirement of the vacuum oxygen decarburization stove decarburization to N；In vacuum oxygen decarburization stove decarburization, vacuum degree≤ 106.4Pa, arrive at a station slag thickness≤50mm, and 800~1000kg of lime, 300~400kg of fluorite, aluminum shot is added according to slag thickness after entering the station Addition is 2.0kg/t；When ladle refining furnace refines, aluminium powder 20~50kg residue adjustments are added, feeding silicon-calcium wire 4m/ before stirring t；The out-station temperature of ladle refining furnace is controlled at 1565~1590 DEG C.
Preferably, in vacuum oxygen decarburization stove decarburization, vacuum degree≤66.5Pa.
Preferably, when ladle refining furnace refines, silicon-calcium wire 4m/t can be fed by 5min before stirring.
Further, in the casting step, molten steel is cast into steel ingot or continuous casting billet, ensures slag in ladle refining furnace In the case of good fluidity, temperature adjustment is surrendered and is molded into or continuous casting to 1530 ± 10 DEG C of cast temperature.
Further, the pipe thermal work steps include the equal thermal process of steel ingot during steel ingot cogging, bloom or Heating process before continuous casting billet milling or forging, heating temperature are 1250~1300 DEG C, and the Heating Steel Ingots time is at least 11 small When, bloom or continuous casting billet heating time are at least 2.5 hours.
Further, in rolling or forging process, by bloom or continuous casting billet milling or it is forged into bar；Ingot is disconnected to finished product Face compression ratio >=5；Start rolling temperature >=1150 DEG C, finishing temperature >=850 DEG C；Rolling deformation passage is according to the determination of bar specification, just Beginning pass deformation≤30%.
Further, in rolling or forging process, it is ensured that while dimensions, surface must not have folding, tie rod, ear The defects of son and serious damage.
Advantageous effect
The corrosion-resistant super martensitic stain less steel pipe of oil well according to the present invention, is containing CO2And ClCorrosion in environment Rate is much smaller than tradition oil field martensitic stain less steel 13Cr, and corrosion resistance is very outstanding, is suitable for high concentration CO2、 H2S and Cl—The deep-well under corrosive environment coexists；Also, its cost is less than two phase stainless steel and nickel-base alloy, service life ratio Common 13Cr martensitic stain less steels improve 2 to 3 times.
Specific implementation mode
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention pair Technical solution of the present invention is clearly and completely described.Obviously, described embodiment is only that the part of the present invention is implemented Example, instead of all the embodiments.Based on the embodiment of the present invention, those of ordinary skill in the art are not making creativeness The every other embodiment obtained under the premise of labour, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, a kind of oil well includes following compositions with corrosion-resistant super martensitic stain less steel pipe (being calculated in mass percent)：C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S ≤ 0.002%, Cr：12~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~ 0.3%, surplus is Fe and other impurity.
In a further embodiment, above-mentioned oil well is resistant to CO with corrosion-resistant super martensitic stain less steel pipe2And chlorion Corrosion.
The effect of oil well of the present invention described in detail below each ingredient of corrosion-resistant super martensitic stain less steel pipe and its The reason of content range limits.
C is austenite former, thus C amounts should be 0.005% or more.But when the C content of stainless steel is super When 0.03%, containing CO2、H2Corrosion resistance will significantly deteriorate under the corrosive environments such as S.Therefore, C content is chosen to be 0.005~0.03%.
Si is added in steel-making as deoxidier, but additive amount is excessive, then influences whether the stability of martensite, is increased Add and to form δ phases and K phases are inclined to, limits Si contents thus as 0.15~0.35%.
Deoxidation, desulfurizing agent when Mn is as melting and add, be the element to form austenite.If additive amount is excessive, Influence whether the toughness of stainless steel.Therefore, in Stainless pipe billet of the present invention, the content range of Mn is selected as 0.3~0.5%.
Cr, which is to ensure that, is containing CO2、Cl、H2Corrosion resistance under the harsh corrosive environment of S etc. and anticorrosion stress-resistant cracking Important element necessary to property.The quenching degree of steel can be improved in Cr, and the intensity of steel, hardness is made to increase, but the plasticity of steel, toughness, cold Formability etc. can decrease.When Cr contents control in appropriate scope, can pass through quenching treatment stablize metallographic group It knits, forms martensite.In order to obtain this effect, the content of Cr must be 12% or more, but when its content is more than 13%, steel Metallographic structure in be easy to form ferrite, be difficult to obtain martensitic structure after quenching treatment.Therefore, by the content of Cr It is chosen to be 12~13%.
Ni is the austenite former for typically improving resistance to general corrosion, and additive amount can destroy structure stability less, It is unfavorable for generating martensite, and resistance to general corrosion cannot be effectively improved；Excessive addition then causes manufacturing cost too high, and And it is unfavorable for toughness.Therefore, in Stainless pipe billet of the present invention, the content of Ni is limited to 4.2~4.7%.
Mo is a kind of ferrite former, and under the premise of containing enough Cr, the present invention can be improved by adding appropriate Mo The corrosion resistance of super martensitic stain less steel, but increasing for Mo elements can cause ferritic phase to increase, and be unfavorable for martensitic phase It generates.Consider, in Stainless pipe billet of the present invention, the content of Mo is chosen to be 0.9~1.1%.
V can form the carbide of small and dispersed after heat treatment, and intensity can be improved, and can additionally improve temperature. But toughness decline and excessive high hardness can be caused after V content excess, while improving cost.Therefore, V content is selected in the present invention It is 0.06~0.1%.
W is carbide, is conducive to the elevated temperature strength for improving material.But W content it is excessively high when, cost increase Height, while processing performance deteriorates.Therefore, in Stainless pipe billet of the present invention, W content is chosen to be 0.01~0.1%.
According to another embodiment of the present invention, a kind of manufacturing method packet of the corrosion-resistant super martensitic stain less steel pipe of oil well Include following the step of implementing in order：Smelting, casting and pipe hot-working.
1, it smelts
Slightly refining and the decarburization of vacuum oxygen decarburization stove and ladle refining furnace are smart by top and bottom combined blown converter for pretreated molten iron After refining, the composition quality percentage of molten steel can tap up to target, be cast into steel ingot or continuous casting billet.Here " molten steel at Point mass percent reaches target " refer to that the composition quality percentage of molten steel reaches following ratios：C：0.005~0.03%, Si： 0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S≤0.002%, Cr：12~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~0.3%.
In top and bottom combined blown converter smelting, bottom blowing whole process is for N2Reduction, and reach vacuum oxygen decarburization stove decarburization to N's It is required that.
In vacuum oxygen decarburization stove decarburization, vacuum degree≤106.4Pa, preferably vacuum degree≤66.5Pa.It is true entering When empty oxygen decarburization stove work station, the slag thickness≤50mm that arrives at a station is controlled, 800~1000kg of lime, firefly are added according to slag thickness after entering the station 300~400kg of stone, aluminum shot addition 2.0kg/t.
When ladle refining furnace refines, aluminium powder 20~50kg residue adjustments are added, 5min feeds silicon-calcium wire 4m/t before weak stirring； The out-station temperature of ladle refining furnace is controlled at 1565~1590 DEG C.
2, it casts
Molten steel is cast into steel ingot or continuous casting billet, in the case where ladle refining furnace ensures slag good fluidity, temperature adjustment is arrived 1530 ± 10 DEG C of cast temperature is surrendered and is molded into or continuous casting.
3, pipe hot-working
The heating process of the pipe thermal work steps, including the equal thermal process of steel ingot, bloom during steel ingot cogging Or the heating process before continuous casting billet milling or forging, heating temperature are：1250~1300 DEG C, the Heating Steel Ingots time is at least 11 A hour, bloom or continuous casting billet heating time are at least 2.5 hours.
In rolling or forging process, by bloom or continuous casting billet milling or it is forged into bar.Ingot is to finished product section compression ratio ≥ 5.Start rolling temperature >=1150 DEG C, finishing temperature >=850 DEG C.Rolling deformation passage is according to the determination of bar specification, initial passage Deflection is not more than 30%.While ensuring dimensions, surface must not have folding, tie rod, the ears or side handles of a utensil and serious scuffing etc. to lack It falls into.
With reference to the embodiment specific implementation mode that the present invention will be described in detail, but the specific implementation mode of the present invention not office It is limited to following embodiments.
The chemical composition of the oil well according to the present invention different embodiments of corrosion-resistant super martensitic stain less steel pipe referring to Table 1.
Table 1：Each embodiment chemical composition (quality %)
C Si Mn P S Cr Ni Mo V W
Embodiment 1 0.005 0.15 0.5 0.007 0.001 12.0 4.7 0.60 0.06 0.30
Embodiment 2 0.008 0.17 0.43 0.009 0.001 12.2 4.6 0.65 0.07 0.25
Embodiment 3 0.011 0.16 0.41 0.006 0.001 12.3 4.5 0.68 0.08 0.22
Embodiment 4 0.015 0.2 0.42 0.007 0.001 12.5 4.4 0.70 0.08 0.20
Embodiment 5 0.020 0.25 0.39 0.005 0.001 12.6 4.4 0.72 0.09 0.18
Embodiment 6 0.023 0.30 0.33 0.007 0.001 12.8 4.3 0.75 0.09 0.15
Embodiment 7 0.030 0.35 0.3 0.008 0.001 13.0 4.2 0.80 0.10 0.10
The target of oil well according to the present invention one embodiment of the manufacturing method of corrosion-resistant super martensitic stain less steel pipe Specification is Φ 200mm.The life of the manufacturing method of the corrosion-resistant super martensitic stain less steel pipe of oil well of Φ 200mm is described below Produce step：
1, it smelts
In top and bottom combined blown converter smelting, bottom blowing whole process is for N2Reduction.
When vacuum oxygen decarburization stove decarburization, vacuum degree is 66~68Pa.Into arriving at a station for vacuum oxygen decarburization stove work station Slag thickness is 30mm, and lime 900kg, fluorite 350kg, aluminum shot addition 2.0kg/t is added according to slag thickness after entering the station.
When ladle refining furnace refines, aluminium powder 30kg residue adjustments are added, 5min feeds silicon-calcium wire 4m/t before weak stirring；Ladle The out-station temperature of refining furnace is controlled at 1580 DEG C.
2, it casts
Molten steel is cast into steel ingot or continuous casting billet, in the case where ladle refining furnace ensures slag good fluidity, temperature adjustment is arrived 1530 DEG C of cast temperature is surrendered and is molded into or continuous casting.
3, pipe hot-working
Steel ingot was heated to 1280 DEG C by 12 hours and keeps the temperature 3 hours, after being just rolled to the bloom of 400 × 400mm, then 1270 DEG C are heated to, is then forged to finished product Φ 200mm using diameter forging process, ingot to finished product section compression ratio is 6.5, opens forging Temperature >=1200 DEG C, whole forging temperature are 950 DEG C, are divided into the forging of 7 passages, initial pass deformation 25%, other passage deformations Amount 30~40%.
It should be noted that herein, the terms "include", "comprise" or its any other variant are intended to non-row His property includes, so that the process, method, article or equipment including a series of elements includes not only those elements, and And further include other elements that are not explicitly listed, or further include solid by this process, method, article or equipment Some elements.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that wrapping Include in the process, method, article or equipment of the element that there is also other identical elements.
Finally it should be noted that：Above example is only used to illustrate the technical scheme of the present invention, rather than its limitations；Although Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features； And these modifications or replacements, the spirit for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution And range.

Claims (10)

1. a kind of corrosion-resistant super martensitic stain less steel pipe of oil well, which is characterized in that including following compositions, with mass percent Meter：C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S≤0.002%, Cr：12 ~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~0.3%, surplus is Fe and other Impurity.
2. the corrosion-resistant super martensitic stain less steel pipe of oil well as described in claim 1, which is characterized in that the resistance to CO of pipe2 And chloride ion corrosion.
3. a kind of oil well as claimed in claim 1 or 2 manufacturing method of corrosion-resistant super martensitic stain less steel pipe, feature It is, includes the steps that following implementing in order：Smelting, casting and pipe hot-working,
Wherein, in the smelting step, pretreated molten iron is by slightly refining, after decarburization and refining, the composition quality of molten steel Percentage, which reaches following ratios, to tap：
C：0.005~0.03%, Si：0.15~0.35%, Mn：0.3~0.5%, P≤0.015%, S≤0.002%, Cr：12 ~13%, Ni：4.2~4.7%, Mo：0.6~0.8%, V：0.06~0.1%, W：0.1~0.3%,
Then, molten steel is cast into steel ingot or continuous casting billet.
4. manufacturing method as claimed in claim 3, which is characterized in that
In the smelting step, pretreated molten iron is slightly refined by top and bottom combined blown converter respectively, vacuum oxygen decarburization stove is de- Carbon and ladle refining furnace refining；
When top and bottom combined blown converter slightly refines, bottom blowing whole process is for N2Reduction, and reach requirement of the vacuum oxygen decarburization stove decarburization to N；
In vacuum oxygen decarburization stove decarburization, vacuum degree≤106.4Pa, arrive at a station slag thickness≤50mm, is added according to slag thickness after entering the station 800~1000kg of lime, 300~400kg of fluorite, aluminum shot addition are 2.0kg/t；
When ladle refining furnace refines, aluminium powder 20~50kg residue adjustments are added, feeding silicon-calcium wire 4m/t before stirring；Ladle refining furnace Out-station temperature is controlled at 1565~1590 DEG C.
5. manufacturing method as claimed in claim 4, which is characterized in that in vacuum oxygen decarburization stove decarburization, vacuum degree≤ 66.5Pa。
6. manufacturing method as claimed in claim 4, which is characterized in that when ladle refining furnace refines, 5min feedings before stirring Silicon-calcium wire 4m/t.
7. manufacturing method as claimed in claim 3, which is characterized in that in the casting step, molten steel is cast into steel ingot Or continuous casting billet, in the case where ladle refining furnace ensures slag good fluidity, temperature adjustment surrenders mould to 1530 ± 10 DEG C of cast temperature Note or continuous casting.
8. manufacturing method as claimed in claim 3, which is characterized in that the pipe thermal work steps include steel ingot cogging process In the equal thermal process of steel ingot, bloom or continuous casting billet milling or forging before heating process, heating temperature be 1250~1300 DEG C, The Heating Steel Ingots time is at least 11 hours, and bloom or continuous casting billet heating time are at least 2.5 hours.
9. manufacturing method as claimed in claim 8, which is characterized in that in rolling or forging process, by bloom or continuous casting billet Roll or be forged into bar；Ingot is to finished product section compression ratio >=5；Start rolling temperature >=1150 DEG C, finishing temperature >=850 DEG C；Rolling Rolling pass is according to the determination of bar specification, initial pass deformation≤30%.
10. manufacturing method as claimed in claim 9, which is characterized in that in rolling or forging process, it is ensured that dimensions it is same When, surface must not have the defect of folding, tie rod, the ears or side handles of a utensil and serious damage.
CN201810269149.8A 2018-03-29 2018-03-29 Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method Pending CN108517471A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810269149.8A CN108517471A (en) 2018-03-29 2018-03-29 Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810269149.8A CN108517471A (en) 2018-03-29 2018-03-29 Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method

Publications (1)

Publication Number Publication Date
CN108517471A true CN108517471A (en) 2018-09-11

Family

ID=63431166

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810269149.8A Pending CN108517471A (en) 2018-03-29 2018-03-29 Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method

Country Status (1)

Country Link
CN (1) CN108517471A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110760763A (en) * 2019-11-06 2020-02-07 江阴市恒润环锻有限公司 Forging method of steel ring forging for nuclear power equipment
CN111363983A (en) * 2020-04-13 2020-07-03 西安建筑科技大学 Super martensitic stainless steel with ultrahigh strength and toughness and preparation method thereof
CN111850425A (en) * 2020-07-31 2020-10-30 西安建筑科技大学 Ultrahigh-strength super martensitic stainless steel and preparation method thereof
CN113584407A (en) * 2020-04-30 2021-11-02 宝山钢铁股份有限公司 High-strength high-temperature corrosion resistant martensitic stainless steel and manufacturing method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104073739A (en) * 2014-07-25 2014-10-01 太原钢铁(集团)有限公司 Heatproof stainless steel seamless steel pipe and manufacture method of stainless steel and seamless steel pipe
CN106414785A (en) * 2014-05-21 2017-02-15 杰富意钢铁株式会社 High-strength stainless steel seamless pipe for oil well, and method for producing same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106414785A (en) * 2014-05-21 2017-02-15 杰富意钢铁株式会社 High-strength stainless steel seamless pipe for oil well, and method for producing same
CN104073739A (en) * 2014-07-25 2014-10-01 太原钢铁(集团)有限公司 Heatproof stainless steel seamless steel pipe and manufacture method of stainless steel and seamless steel pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110760763A (en) * 2019-11-06 2020-02-07 江阴市恒润环锻有限公司 Forging method of steel ring forging for nuclear power equipment
CN111363983A (en) * 2020-04-13 2020-07-03 西安建筑科技大学 Super martensitic stainless steel with ultrahigh strength and toughness and preparation method thereof
CN113584407A (en) * 2020-04-30 2021-11-02 宝山钢铁股份有限公司 High-strength high-temperature corrosion resistant martensitic stainless steel and manufacturing method thereof
CN111850425A (en) * 2020-07-31 2020-10-30 西安建筑科技大学 Ultrahigh-strength super martensitic stainless steel and preparation method thereof

Similar Documents

Publication Publication Date Title
CN101417296B (en) Manufacture method of large caliber high steel grade corrosion proof seamless steel tube in diameter phi 219.0-460.0mm
US10287645B2 (en) Method for producing high-strength steel material excellent in sulfide stress cracking resistance
CN108517471A (en) Oil well corrosion-resistant super martensitic stain less steel pipe and its manufacturing method
CN100507061C (en) High collapse-resistance and hydrogen sulphide-corrosion-resistant low alloy petroleum case pipe and method of manufacturing the same
CN100500917C (en) Sulfur erosion resisting steel smelting method
CN103334055B (en) Pipeline steel with resistance against carbon dioxide and hydrogen sulfide corrosion and preparation method thereof
CN102199736A (en) High-strength and anti-CO2/H2S corrosion seamless gathering-line pipe
CN101892432A (en) Manufacturing method of X70QS seamless line pipe for acid environment
JP6540921B1 (en) Martensitic stainless steel seamless steel pipe for oil well pipe and method for producing the same
CN101921957A (en) Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm
CN101608282B (en) Drill rod material steel pipe resisting low temperature of -40 to -60 DEG C and manufacturing method thereof
CN103789685A (en) High-strength high-toughness petroleum drill pipe and production method thereof
CN101082112A (en) 110Ksi grade CO2 H2S rust-proof oil well-pipe and manufacturing method
CN108277438A (en) Mo ultralow-carbon martensitic stainless steel seamless pipe and its manufacturing method
CN103131897B (en) 110ksi-level titanium alloy oil well pipe and production method thereof
CN104451394B (en) Anti-CO2 corrosion oil well pipe below 150 ksi produced by CPE unit and production method thereof
CN106191671B (en) High strength sulfur resisting hydrogen-type corrosion seamless line pipe and preparation method thereof
CN101397637B (en) 13Cr high anti-carbon dioxide and trace hydrogen sulfide corrosion tubing and casing steel and method for producing the same
CN102534422B (en) Manufacturing method of corrosion-resistant steel tubes for natural gas conveying pipelines
CN100566922C (en) CO 2And H 2The preparation technology of the corrosion resistant low-chromium tubing and casing in the S coexisted environment
CN102747279A (en) Oil casing capable of resisting hydrogen sulfide stress corrosion cracking and manufacturing method thereof
CN101082383A (en) Sulfurated hydrogen corrosion proof seamless pipe for oil-gas gathering and transporting
CN111218624B (en) Carbon dioxide corrosion resistant seamless steel pipe and preparation method thereof
CN107904487A (en) A kind of polynary chrome molybdenum carbon dioxide corrosion resistant oil well pipe and its manufacture method
CN106498279A (en) A kind of economical X65 pipe line steels of low Cr of anti-CO2 corrosion and production method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20180911

RJ01 Rejection of invention patent application after publication