CN114836691B - Seamless steel pipe for drilling and manufacturing method thereof - Google Patents
Seamless steel pipe for drilling and manufacturing method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- 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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—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
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- 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
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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
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention relates to a seamless steel tube for a drill, which comprises the following components in percentage by weight: c:0.10% -0.14%, si:0.55 to 0.70 percent of Mn:0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, cr:1.55 to 1.70 percent of Mo:0.50% -0.70%, V:0.03 to 0.05 percent of Ni:0.81% -1.00%, ti:0.055% -0.080%, B:0.0005% -0.0050%, N:0.010% -0.019%, als:0.01% -0.05%, H: less than or equal to 0.0002 percent, O: less than or equal to 0.0021 percent, and Ti/N is more than or equal to 3.5; the balance being Fe. The invention can greatly increase the use safety of the steel pipe with high strength grade in complex environment, such as high-pressure wells, deep wells and the like. The manufacturing process of the steel pipe is environment-friendly, fewer in working procedures, shorter in production period and capable of reducing economic cost and time cost.
Description
Technical Field
The invention relates to the technical field of low alloy steel manufacturing, in particular to a seamless steel tube for drilling and a manufacturing method thereof.
Background
With the continuous development and progress of oil and gas exploration technologies, the oil and gas reservoirs of the extracted oil and gas are gradually changed from shallow to deep and start to extend to complex and severe geological structure blocks, the pressure in the oil and gas wells is increased, the viscosity of crude oil is enhanced, and the stress state born by the downhole oil well pipe is more complex and severe. Such drilling and production conditions are very demanding in terms of strength and toughness of the oil well pipe, and generally require that the yield strength of the steel pipe reach 1000MPa or more.
Under the current production technology level, the existence of tiny defects or damages to the steel is difficult to avoid, and the key is to improve the toughness of the pipe while improving the strength of the pipe, so that the defects or damages of the material cannot expand after bearing to cause cracking. At present, one of the main problems restricting the mechanical properties of oil well pipes is that the high strength and the toughness are matched, the toughness of general steel is expressed as a relationship of mutual lengthening, the toughness of steel with high strength is often low, and conversely, the strength of steel is required to be sacrificed in order to pursue high toughness. Experiments show that when the yield strength of the pipe is above 950MPa, the impact toughness is reduced along with the further improvement of the strength, and the oil well pipe with the strength level of toughness matching not lower than 0.1 and even higher with the yield strength of 1000MPa is an urgent product in the current and future, which is also a recognized worldwide problem and is always the hot spot field of research of various metallurgists and experts.
For example, chinese patent with publication number of CN2109055873A discloses a chemical composition formula of 140ksi steel grade seamless steel pipe, which is manufactured by adopting a converter steelmaking and tempering process, but the yield strength of the product of the invention can only be ensured to be over 980MPa, the high strength requirement of the yield strength higher than 1000MPa can not be met, the application range is limited, and the product can only be used under limited conditions.
The Chinese patent with publication number of CN103320697A discloses a drill pipe body under ultra-deep well working condition and a manufacturing method thereof, wherein a steel pipe is manufactured mainly by adopting a quenching and secondary tempering heat treatment mode, the process cost is increased, the economy is poor, the impact toughness of a product cannot meet the requirement that the toughness is matched with not less than 0.1, and the use safety of the product is difficult to ensure.
The Chinese patent with publication number of CN102400065A provides a chemical composition formula of a seamless steel tube for a high-toughness ultrahigh-strength oil well, which improves the impact toughness of a seamless steel tube material in a mode of greatly increasing the types and the contents of chemical elements, but the yield strength of a product can only ensure over 980MPa, cannot meet the high-strength requirement that the yield strength is higher than 1000MPa, has limited application range and can only be used under limited conditions.
The Chinese patent with publication number of CN11114954A discloses a heat treatment method of a seamless steel tube for deep well shale gas containing rare earth, which mainly adopts a heat treatment mode of secondary quenching, high-temperature tempering and straightening, increases the process cost, has poor economy, increases the difficulty of production organization, is unfavorable for industrial popularization and application, and has the technical effect that the description of the product is in paradox, the situation that the yield strength of the product exceeds the tensile strength is generated, and the product is inconsistent with the normal condition, and the use safety of the product is difficult to ensure.
The Chinese patent with publication number of CN1619005A discloses a petroleum casing pipe for deep wells and ultra-deep wells and a production method thereof, but the matched impact toughness of the petroleum casing pipe can only be ensured to 40J, the toughness is obviously unsatisfactory, the requirement that the toughness is matched with not less than 0.1 can not be met, and the use safety of the petroleum casing pipe is difficult to ensure.
The Chinese patent with publication number of CN100595309C discloses a high-strength high-toughness petroleum casing pipe and a manufacturing method thereof, wherein the impact toughness of product matching can only be guaranteed to 80J, the requirement that the toughness and strength matching is not lower than 0.1 can not be met, and the use safety of the product is difficult to guarantee. The Chinese patent with publication number of CN101586450A discloses a petroleum casing pipe with higher strength, and the yield strength can reach 160ksi, but the matched impact toughness value can not meet the requirement that the toughness is matched to be not less than 0.1, so that the use safety is lower. The Chinese patent with publication number of CN101285151A discloses a petroleum casing pipe with high toughness and a manufacturing method thereof, and the petroleum casing pipe is produced by oil quenching, so that relatively good toughness performance is obtained, but the petroleum casing pipe has obvious defects from the aspects of production efficiency, energy conservation, environmental protection and safety.
In summary, none of the disclosed patent technologies provides oil well pipe products having a strength level of toughness matching not less than 0.1 and a yield strength of 1000MPa or more, and fails to meet the requirements of oil well pipes for safety in use under current and future severe use conditions.
Disclosure of Invention
The invention aims to solve the technical problem of providing a seamless steel tube for drilling and a manufacturing method thereof, which can meet the requirements of safe exploitation of complex well conditions such as deep wells, ultra-deep wells and the like of oil and gas fields.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a seamless steel pipe is used for drilling, and the components are as follows in percentage by weight: c:0.10% -0.14%, si:0.55 to 0.70 percent of Mn:0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, cr:1.55 to 1.70 percent of Mo:0.50% -0.70%, V:0.03 to 0.05 percent of Ni:0.81% -1.00%, ti:0.055% -0.080%, B:0.0005% -0.0050%, N:0.010% -0.019%, als:0.01% -0.05%, H: less than or equal to 0.0002 percent, O: less than or equal to 0.0021 percent, and Ti/N is more than or equal to 3.5; the balance being Fe.
The performance of the seamless steel pipe adopted by the drill is as follows: yield strength: 1000-1150 MPa; tensile strength: more than or equal to 1080MPa; impact toughness: full-size Charpy impact energy (0 ℃) is more than or equal to 120J; the elongation percentage is more than or equal to 19 percent.
The action of each alloy element:
c: on one hand, the effect of carbon is to improve the hardenability, and the strength can be improved by forming carbide with other alloy elements in the steel, and when the carbon content is lower than 0.10%, the hardenability and the strength of the steel are difficult to ensure; on the other hand, the excessive carbon element content can be filled in the matrix lattice gaps of the steel, so that the toughness of the steel is greatly destroyed, and the carbon content higher than 0.14% is unfavorable for guaranteeing the toughness.
Si: the effect of silicon, on the one hand, plays a role in deoxidization, and in order to obtain lower oxygen content, the silicon content needs to be limited to more than 0.55 percent; on the other hand, silicon is dissolved in the steel in a substitution mode, so that the strengthening effect can be achieved, the strength loss caused by the reduction of the clearance solid solution quantity of carbon content is compensated, and the damage to toughness can be reduced. However, the upper limit of the silicon content must be set, otherwise, too high a content still causes some damage to the toughness of the steel, so that the upper limit of the silicon content is limited to 0.70%.
Mn: on one hand, the effect of manganese can improve the hardenability, and can be combined with S element in steel to form MnS, so that the hot brittleness of the steel can be avoided; on the other hand, mn can enlarge the austenite region of steel, refine grains, play a role in improving the toughness of steel, have insignificant effect when the content is lower than 0.3%, promote the effect of harmful elements to begin to be significant in grain boundary segregation when the content exceeds 0.5%, and reduce the toughness of the product of the invention.
P: phosphorus segregates at grain boundaries, increasing the ductile-brittle transition temperature, decreasing the toughness of the steel, which must be limited to 0.010% or less.
S: sulfur is easy to form non-hard inclusions with manganese and the like, and the non-hard inclusions are deformed in an extending way along the rolling direction in the processing process, so that the continuity of a material matrix is damaged, and the Charpy V-shaped notch toughness index of the steel pipe is reduced. It is limited to 0.003% or less.
Cr: the effect of chromium can improve the hardenability on one hand, so that more martensite structures can be obtained when the steel is quenched; on the other hand, chromium has stronger affinity with carbon and nitrogen, so that iron in iron carbonitride can be replaced, the size and the shape of carbide are improved, and better toughness is obtained. In addition, the chromium also has corrosion resistance and is greatly beneficial to the use safety of the product. When the content is less than 1.55%, the toughness and strength of the product of the invention are insufficient, and when the content is more than 1.70%, the effect is not obvious.
Mo: the effect of molybdenum can improve the hardenability on one hand, so that more martensite structures can be obtained when the steel is quenched; on the other hand, molybdenum can improve the tempering resistance of steel, inhibit tempering brittleness, has obvious grain refining effect, has a large effect on improving the toughness of the steel, and has the toughness which is difficult to meet the requirement when the content is lower than 0.50 percent, and has the effect which is weakened and the cost is increased when the content is higher than 0.70 percent.
V: on one hand, the strength of the steel is improved through the effect of vanadium by forming carbon and nitrogen compounds; on the other hand, vanadium can refine grains and has the effect of improving the toughness of steel. However, the action of vanadium is closely related to the content ratio of carbon, nitrogen and titanium, and the toughness of the vanadium alloy is not required when the content of vanadium is lower than 0.03%, and the action is not obvious when the content of vanadium is higher than 0.05%.
Ni: nickel is an important alloy element added into the steel, on one hand, nickel can promote the occurrence of cross sliding in the steel, reduce the ductile-brittle transition temperature and obviously improve the toughness; nickel, on the other hand, is one of the strongest austenite stabilizing elements, which can improve the hardenability and structural uniformity of the steel. For the purpose of the present invention, the addition amount of nickel is at least 0.81%, and the upper limit of the nickel content is defined to be 1.00% in the present invention because nickel is expensive and resources are scarce.
Ti: on one hand, the titanium has very strong affinity with carbon and nitrogen, can promote the formation of carbon and nitrogen compounds, can improve the strength of steel and can improve the toughness of the steel; on the other hand, carbon and nitride formed by titanium, carbon and nitrogen can play roles of refining grains and improving toughness, but when the content of titanium is higher than 0.080%, smelting and casting are easy to flocculate a water gap, the process control difficulty is increased, and the product quality stability is reduced, so the content range of titanium is limited to be 0.055-0.080%.
B: on the one hand, the boron can reduce the segregation concentration of carbon atoms on the grain boundary in the steel, effectively inhibit the precipitation of proeutectoid ferrite and strongly improve the hardenability of the steel; on the other hand, boron has less delay on bainite and martensite transformation, and can effectively strengthen the grain boundary of steel. Further, although a remarkable effect can be obtained by only a trace amount of boron being present in the steel, the difficulty in controlling the performance stability of the steel increases when the content is too high, and therefore, the range of boron is limited to 0.0005 to 0.0050% in the present invention.
N: on one hand, nitrogen can form a compound with titanium and vanadium, so that the strength of the steel is improved, and the toughness of the steel is improved; on the other hand, the nitrogen metal compound also plays a role in refining grains in the manufacturing process, and improves the toughness of the steel. The content is too little, the effect is not obvious, the content is too much, the control cost is increased, and the stable obtaining of the technical effect of the invention is not facilitated, so the range of limiting nitrogen in the invention is 0.010-0.019 percent.
Als: aluminum is added as a strong deoxidizer on one hand, and on the other hand, grains can be refined, the toughness of the steel is improved, the effect is insufficient when the content of acid-soluble aluminum in the steel is lower than 0.01 percent, the effect is saturated when the content of acid-soluble aluminum in the steel is higher than 0.05 percent, and the high-temperature toughness of the steel is damaged.
H. O: hydrogen and oxygen are used as harmful gas elements, the content of the harmful gas elements in steel is limited, otherwise, the toughness is influenced.
A manufacturing method of seamless steel pipes for drills comprises the following steps: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing and reaming, extending and rolling, reheating, quenching and cooling by water, tempering, straightening at a temperature and detecting a flaw; wherein:
1) Centrifugal casting to obtain a hollow tube blank, wherein the centrifugal casting temperature is 1580-1620 ℃ and the rotating speed is 1450-1500 rpm;
2) The low-temperature heating temperature of the tube blank is 1150-1200 ℃;
3) The piercing-rolling temperature is 1150-1200 ℃;
4) The extension deformation temperature of the extension rolled steel pipe is not lower than 1000 ℃;
5) Immediately performing rapid water quenching and cooling at the reheating temperature of 880-900 ℃ and the cooling speed of 70-80 ℃/s to obtain a quenching structure with martensite accounting for more than 90%;
6) The tempering temperature of the steel pipe is 620-680 ℃;
7) And straightening the steel pipe at the temperature of not lower than 350 ℃ after sizing.
Compared with the prior art, the invention has the beneficial effects that:
1. the ratio of the CVN of the Charpy V-shaped notch of the steel pipe to the yield strength is more than or equal to 0.1, the yield strength of the product is ensured not to be lower than 1000MPa, and the use safety of the steel pipe requiring high strength level such as a high-pressure well, a deep well and the like in a complex environment can be greatly improved.
2. The manufacturing process of the steel pipe is environment-friendly, fewer in working procedures, shorter in production period and capable of reducing economic cost and time cost.
Detailed Description
The invention is further illustrated by the following examples:
the following examples illustrate the invention in detail. These examples are merely illustrative of the best embodiments of the invention and do not limit the scope of the invention.
A seamless steel pipe is used for drilling, and the components are as follows in percentage by weight: c:0.10% -0.14%, si:0.55 to 0.70 percent of Mn:0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, cr:1.55 to 1.70 percent of Mo:0.50% -0.70%, V:0.03 to 0.05 percent of Ni:0.81% -1.00%, ti:0.055% -0.080%, B:0.0005% -0.0050%, N:0.010% -0.019%, als:0.01% -0.05%, H: less than or equal to 0.0002 percent, O: less than or equal to 0.0021 percent, and Ti/N is more than or equal to 3.5; the balance being Fe.
A manufacturing method of seamless steel pipes for drills comprises the following steps: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing and reaming, extending and rolling, reheating, quenching and cooling by water, tempering, straightening at a temperature and detecting a flaw; the method specifically comprises the following steps:
smelting of steel
The smelting process route of molten steel smelting, external refining and vacuum degassing comprises the steps of selecting high-quality IF steel scrap and sponge iron as steelmaking raw materials, adopting a pure steel smelting technology to control the contents of P, S, O, H, as, sn, pb, sb, bi and other harmful elements, wherein the external refining and the vacuum degassing adopt nitrogen to replace argon for stirring, and the nitrogen adding mode is adopted to add in a V-N alloy mode.
Production of blank pipe
In order to improve the toughness of a material matrix, a tube blank of the product is obtained by adopting a centrifugal casting mode, the cast blank is a hollow blank, the blank is subjected to sizing treatment, and the inner surface and the outer surface of the sized blank are cleaned to obtain a tube blank with smooth inner and outer surfaces.
Shaping of the steel pipe
The hollow tube blank is put into a heating furnace and heated to be uniform in temperature, the heating temperature is 1150-1200 ℃, the low-temperature heating of the tube blank ensures that the grain structure of the rolled steel tube is finer, the lower the heating temperature of the tube blank is, the smaller the original austenite grain size is, and the size effect can inherit the reheated austenite, so that the martensite quenching structure, tempering structure and substructure with smaller size can be obtained. And the refined grain size can obviously improve the toughness of the steel, and can slightly improve the strength performance of the steel. And the toughness and strength performance of the product are improved. Then piercing and rolling the hollow pipe by a piercing machine, wherein the piercing and rolling temperature of the pipe blank is 1150-1200 ℃, and the piercing machine has small deformation resistance to wall-reducing deformation of the hollow pipe blank; the steel pipe after reaming and wall reduction is shaped by an extension deformation and micro-tension sizing and reducing unit of a steel pipe extension rolling unit, the extension deformation temperature of the steel pipe is not lower than 1000 ℃, then the steel pipe is reheated by a heating furnace and cooled by rapid water quenching, the cooling speed is 70-80 ℃/s, the quenching structure with the martensite ratio of more than 90% is obtained by controlling cooling, then tempering treatment is carried out, the tempering temperature of the steel pipe is 620-680 ℃, the steel pipe after sizing is straightened by adopting a strip temperature of not lower than 350 ℃, and the straightened steel pipe is subjected to flaw detection.
Examples:
The chemical composition of the steel is shown in table 1; the manufacturing process parameters are shown in Table 2; the mechanical properties of the seamless steel pipes are shown in Table 3.
Table 1: chemical composition
Table 2: manufacturing process parameters
Table 3: mechanical properties of the products of the invention
Claims (1)
1. A seamless steel pipe for a drill, characterized by a yield strength: 1000-1150 MPa; the tensile strength is more than or equal to 1080MPa; impact toughness: full-size Charpy impact energy is more than or equal to 120J; the elongation is more than or equal to 19 percent, and the components are as follows in percentage by weight: c:0.10% -0.14%, si:0.55 to 0.70 percent of Mn:0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, cr:1.55 to 1.70 percent of Mo:0.50% -0.70%, V:0.03 to 0.05 percent of Ni:0.81% -1.00%, ti:0.055% -0.080%, B:0.0005% -0.0050%, N:0.010% -0.019%, als:0.01% -0.05%, H: less than or equal to 0.0002 percent, O: less than or equal to 0.0021 percent, and Ti/N is more than or equal to 3.5; the balance of Fe; the drill adopts a seamless steel tube manufacturing method, and the process flow is as follows: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing and reaming, extending and rolling, reheating, quenching and cooling by water, tempering, straightening at a temperature and detecting a flaw; wherein:
1) Centrifugal casting to obtain a hollow tube blank, wherein the centrifugal casting temperature is 1580-1620 ℃ and the rotating speed is 1450-1500 rpm;
2) The low-temperature heating temperature of the tube blank is 1150-1200 ℃;
3) The piercing-rolling temperature is 1150-1200 ℃;
4) The extension deformation temperature of the extension rolled steel pipe is not lower than 1000 ℃;
5) Immediately performing rapid water quenching and cooling at the reheating temperature of 880-900 ℃ and the cooling speed of 70-80 ℃/s to obtain a quenching structure with martensite accounting for more than 90%;
6) The tempering temperature of the steel pipe is 620-680 ℃;
7) And straightening the steel pipe at the temperature of not lower than 350 ℃ after sizing.
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| CN202210460869.9A CN114836691B (en) | 2022-04-28 | 2022-04-28 | Seamless steel pipe for drilling and manufacturing method thereof |
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| CN202210460869.9A CN114836691B (en) | 2022-04-28 | 2022-04-28 | Seamless steel pipe for drilling and manufacturing method thereof |
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| CN114836691A CN114836691A (en) | 2022-08-02 |
| CN114836691B true CN114836691B (en) | 2023-06-16 |
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| JPH0717947B2 (en) * | 1990-01-10 | 1995-03-01 | 新日本製鐵株式会社 | Low yield ratio high strength steel sheet manufacturing method |
| CN101586450A (en) * | 2009-04-29 | 2009-11-25 | 天津钢管集团股份有限公司 | Have high strength and high toughness petroleum casing pipe and manufacture method thereof |
| CN102400065A (en) * | 2010-09-07 | 2012-04-04 | 鞍钢股份有限公司 | High-toughness and ultra-high strength seamless steel pipe for oil well and manufacturing method thereof |
| FI20106275A (en) * | 2010-12-02 | 2012-06-03 | Rautaruukki Oyj | Ultra high strength structural steel and a process for producing ultra high strength structural steel |
| CN104480406A (en) * | 2014-11-28 | 2015-04-01 | 宝山钢铁股份有限公司 | Low-alloy high-strength high-toughness steel plate and manufacturing method thereof |
| CN104726790B (en) * | 2015-02-13 | 2017-03-22 | 天津钢管集团股份有限公司 | Method for manufacturing seamless pipeline pipe from low-carbon martensite pulp conveying wear-resistant seamless pipeline steel |
| CN109055873A (en) * | 2018-10-08 | 2018-12-21 | 鞍钢股份有限公司 | A kind of 140ksi grade of steel seamless steel pipe and its manufacturing method |
| CN109868413A (en) * | 2019-03-06 | 2019-06-11 | 天津钢管集团股份有限公司 | The manufacturing method of 110ksi steel grade sulfur resistant compound stress corrosion tool joint pipe |
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