CN114836691A - Seamless steel pipe for drilling and production and manufacturing method thereof - Google Patents
Seamless steel pipe for drilling and production 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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- 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
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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 pipe for drilling, which comprises the following components in percentage by weight: c: 0.10% -0.14%, Si: 0.55-0.70%, Mn: 0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, Cr: 1.55-1.70%, Mo: 0.50% -0.70%, V: 0.03% -0.05%, 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 percent; the balance being Fe. The invention can greatly improve the use safety of steel pipes needing high strength grade, such as high-pressure wells, deep wells and the like in complex environment. The manufacturing process of the steel pipe is green and environment-friendly, the working procedures are fewer, the production period is shorter, and the economic cost and the time cost are reduced.
Description
Technical Field
The invention relates to the technical field of low alloy steel manufacturing, in particular to a seamless steel pipe for drilling and production and a manufacturing method thereof.
Background
With the continuous development and progress of oil and gas exploration technology, the exploited oil layer and the gas layer of natural gas gradually change from shallow to deep and begin to extend to a complicated and severe geological structure block, the pressure in the oil and gas wells is increased, the viscosity of crude oil is enhanced, and the stress state borne by the oil well pipe in the well is more complicated and severe. Such drilling and production conditions are very demanding on the strength and toughness of oil well pipes, and the yield strength of steel pipes is generally required to reach 1000MPa or more.
In the current production technology level, the tiny defects or damages of steel are 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 to cause fracture after bearing. At present, one of the main problems restricting the mechanical properties of oil well pipes is matching between high strength and toughness, and the toughness of general steels is shown as a relationship of mutual elimination, and the high strength steel often has low toughness, whereas the strength of the steel must be sacrificed in pursuit of high toughness. Experiments show that when the yield strength of the pipe is more than 950MPa, the impact toughness is reduced in a cliff type manner with further improvement of the strength, and the oil well pipe with the yield strength of 1000MPa or even higher with the toughness matching not less than 0.1 is an urgent product in the present and future, which is a well-known worldwide problem and is always a hot spot field for research of various metallurgists and experts.
For example, chinese patent publication No. CN2109055873A discloses a chemical composition formula of a 140ksi steel grade seamless steel tube, which is manufactured by converter steelmaking and tempering processes, but the yield strength of the product of the invention can only be guaranteed to be over 980MPa, the high strength requirement that the yield strength is 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 CN103320697A introduces a drill pipe body under ultra-deep well working conditions and a manufacturing method thereof, and mainly adopts a quenching and secondary tempering heat treatment mode to manufacture a steel pipe, thereby increasing the process cost, having poor economy, and the impact toughness of the product can not meet the requirement that the toughness-strength matching is not less than 0.1, and the use safety of the product is difficult to ensure.
The Chinese patent with publication number CN102400065A provides a chemical component formula of a seamless steel tube for a high-toughness and ultrahigh-strength oil well, the impact toughness of the seamless steel tube material is improved by greatly increasing the types and the contents of chemical elements, but the yield strength of the product can only be ensured to be over 980MPa, the high-strength requirement that the yield strength is higher than 1000MPa cannot be met, the application range is limited, and the seamless steel tube can only be used under limited conditions.
The Chinese patent with publication number CN11114954A discloses a heat treatment method for a seamless steel tube containing rare earth for deep well shale gas with high strength and high toughness, 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 not beneficial to industrial popularization and application, and moreover, the description of the technical effect of the product is contradictory, the condition that the yield strength of the product is opposite to the super tensile strength occurs, which is not in accordance with the conventional theory, and the use safety of the product is difficult to ensure.
The Chinese patent with the publication number of CN1619005A introduces a deep well and ultra-deep well petroleum casing and a production method thereof, but the impact toughness matched with the product can only be ensured to 40J, the toughness is obviously not ideal, the requirement that the toughness and strength matching is not less than 0.1 can not be met, and the use safety of the product is difficult to ensure.
The Chinese patent with the publication number of CN100595309C introduces a high-strength high-toughness petroleum casing pipe and a manufacturing method thereof, the impact toughness of the 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 CN101586450A discloses a petroleum casing with higher strength, and it is introduced that the yield strength can reach 160ksi, but the matched impact toughness value can not meet the requirement that the toughness and strength matching is not less than 0.1, and the use safety is lower. Chinese patent publication No. CN101285151A discloses a high-toughness petroleum casing and a method for manufacturing the same, which are produced by oil quenching, but have significant disadvantages in terms of production efficiency, energy saving, environmental protection, and safety.
In summary, none of the disclosed patent technologies can provide an oil well pipe product having a strength level of 1000MPa or more with a toughness and strength matching of not less than 0.1, and cannot meet the requirements of oil well pipes for safety in use under current and future severe service conditions.
Disclosure of Invention
The invention aims to solve the technical problem of providing a seamless steel pipe for drilling and production and a manufacturing method thereof, which meet the safety mining requirements of oil and gas field deep wells, ultra-deep wells and other complex well conditions.
In order to realize the purpose, the invention adopts the following technical scheme:
a seamless steel pipe for drilling and production comprises the following components in percentage by weight: c: 0.10% -0.14%, Si: 0.55-0.70%, Mn: 0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, Cr: 1.55-1.70%, Mo: 0.50% -0.70%, V: 0.03% -0.05%, 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 percent; the balance being Fe.
The properties of the seamless steel pipe for drilling and production are as follows: yield strength: 1000-1150 MPa; tensile strength: not less than 1080 MPa; impact toughness: the full-size Charpy impact energy (0 ℃) is more than or equal to 120J; the elongation is more than or equal to 19 percent.
The function of each alloy element is as follows:
c: on one hand, the carbon has the function of improving the hardenability, the carbon can improve the strength by forming carbide with other alloy elements in the steel, and when the carbon content is less than 0.10 percent, the hardenability and the strength of the steel are difficult to ensure; on the other hand, the excessive carbon content can be filled in the matrix lattice gaps of the steel, so that the toughness of the steel is greatly damaged, and the carbon content of more than 0.14 percent is not beneficial to ensuring the toughness.
Si: the silicon plays a role in deoxidation, and in the invention, in order to obtain lower oxygen content, the content of the silicon needs to be limited to more than 0.55 percent; on the other hand, the silicon is dissolved in the steel in a replacement mode, so that the strengthening effect can be achieved, the strength loss caused by reduction of the carbon content and the interstitial solid solution amount is made up, and the damage to the toughness can be reduced. However, the upper limit of the content of silicon must be set, and the upper limit of the content is limited to 0.70% because too high a content may still cause some deterioration in the toughness of the steel.
Mn: on one hand, the hardenability can be improved by the action of manganese, and MnS is combined with S element in steel, so that the hot brittleness of the steel can be avoided; on the other hand, Mn can enlarge the austenite region of the steel, can refine grains and plays a role in improving the toughness of the steel, the effect is not obvious when the content is lower than 0.3 percent, and the effect of promoting the segregation of harmful elements in grain boundaries starts to be obvious when the content exceeds 0.5 percent, so that the toughness of the product is reduced.
P: phosphorus segregates at grain boundaries, increases the ductile-brittle transition temperature, and decreases the toughness of steel, but it is 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 subjected to extension deformation along the rolling direction in the machining process, so that the continuity of a material matrix is damaged, and the toughness index of the V-shaped notch of the steel pipe in summer is reduced. Here, the content should be limited to 0.003% or less.
Cr: the chromium has the effect of improving the hardenability on one hand, so that more martensite structures can be obtained during the quenching of the steel; on the other hand, the chromium has stronger affinity with carbon and nitrogen, can replace iron in iron carbonitride, improves the size and the form of carbide and obtains better obdurability. In addition, chromium also has a corrosion resistance effect, and is greatly beneficial to the use safety of the product. At contents below 1.55%, the toughness and strength of the product of the invention may be insufficient, and at contents above 1.70%, the effect is not significant.
Mo: the molybdenum has the effect of improving the hardenability on one hand, so that more martensite structures can be obtained during the quenching of the steel; on the other hand, molybdenum can improve the tempering resistance of steel and inhibit the tempering brittleness, the effect of refining crystal grains is obvious, the effect of improving the strength and toughness of the steel is large, when the content is lower than 0.50%, the strength and toughness are difficult to meet the requirement, and when the content is higher than 0.70%, the effect in the invention is weakened, and the cost is increased.
V: on one hand, the vanadium improves the strength of the steel by forming compounds of carbon and nitrogen; on the other hand, vanadium can refine grains and has the effect of improving the toughness of steel. But the function of the vanadium is closely related to the content proportion of carbon, nitrogen and titanium, and the obdurability of the invention can not meet the requirement when the content of the vanadium is less than 0.03 percent, and the effect is not obvious when the content of the vanadium is more than 0.05 percent.
Ni: nickel is an important alloy element added in the steel, on one hand, the nickel can promote the occurrence of cross slip in the steel, reduce the ductile-brittle transition temperature and obviously improve the toughness; on the other hand, nickel is also one of the most strongly austenite stabilizing elements, and can improve hardenability and structural uniformity of steel. For the purpose of the present invention, the amount of nickel added is at least 0.81%, and since nickel is expensive and scarce in resources, the upper limit of the nickel content is defined as 1.00% in the present invention.
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 also improve the toughness of 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 the titanium is higher than 0.080%, a water flocculation port is easy to smelt and cast, the process control difficulty is increased, and the product quality stability is reduced, so that the content range of the titanium is limited to 0.055-0.080%.
B: the boron has the effects of reducing the segregation concentration of carbon atoms on grain boundaries in the steel, effectively inhibiting the precipitation of proeutectoid ferrite and strongly improving the hardenability of the steel; on the other hand, boron delays bainite and martensite transformation little, and can effectively strengthen the grain boundary of steel. Further, a significant effect can be obtained if a trace amount of boron is present in the steel, but the difficulty in controlling the performance stability of the steel increases when the content is too high, so that the 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 metal compound of nitrogen also plays a role in refining grains in the manufacturing process, and the toughness of the steel is improved. The content is too small, the effect is not obvious, the content is too much, the control cost is increased, and the stable obtaining of the technical effect is not facilitated, so that the range of the nitrogen is limited to 0.010-0.019 percent in the invention.
And Als: on one hand, aluminum is added as a strong deoxidizer, on the other hand, crystal 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 harmful gas elements, and the content of the harmful gas elements in steel needs to be limited, otherwise, the toughness is influenced.
A manufacturing method of a seamless steel pipe for drilling and production comprises the following process flows: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing, rolling and reaming, extension rolling, reheating, water quenching and cooling, tempering treatment, straightening with temperature and flaw detection; wherein:
1) carrying out centrifugal casting to obtain a hollow tube blank, wherein the centrifugal casting temperature is 1580 and 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 rolling steel pipe is not lower than 1000 ℃;
5) heating to 880-900 ℃, and immediately carrying out rapid water quenching and cooling at 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) straightening the steel pipe with the temperature not lower than 350 ℃ after sizing.
Compared with the prior art, the invention has the beneficial effects that:
1. the ratio of the CVN to the yield strength of the V-shaped notch of the steel pipe is more than or equal to 0.1, the yield strength of the steel pipe is not lower than 1000MPa, and the use safety of the steel pipe which needs high strength grade, 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, has fewer working procedures and shorter production period, and reduces economic cost and time cost.
Detailed Description
The invention is further illustrated by the following examples:
the following examples describe the invention in detail. These examples are merely illustrative of the best embodiments of the present invention and do not limit the scope of the invention.
A seamless steel pipe for drilling and production comprises the following components in percentage by weight: c: 0.10% -0.14%, Si: 0.55-0.70%, Mn: 0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, Cr: 1.55-1.70%, Mo: 0.50% -0.70%, V: 0.03% -0.05%, 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 percent; the balance being Fe.
A manufacturing method of a seamless steel pipe for drilling and production comprises the following process flows: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing, rolling and reaming, elongation rolling, reheating, quenching and cooling with water, tempering, straightening with temperature and flaw detection; the method specifically comprises the following steps:
smelting of steel
The smelting process comprises the steps of molten steel smelting, external refining and vacuum degassing, wherein high-quality IF steel scrap and sponge iron are selected As steelmaking raw materials, a pure steel smelting technology is adopted to control P, S, O, H and the content of harmful elements such As As, Sn, Pb, Sb, Bi and the like, the external refining and the vacuum degassing are carried out by adopting nitrogen to replace argon for stirring, and the nitrogen is added in a V-N alloy mode.
Manufacturing of tube blank
In order to improve the toughness of a material matrix, the tube blank of the product is obtained by 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 the tube blank with a smooth inner surface and a smooth outer surface.
Forming of the steel pipe
The hollow tube blank is put into a heating furnace and heated to the temperature which is uniform and is 1150-1200 ℃, the tube blank is heated at low temperature, so that the grain structure of the rolled steel tube is more refined, the grain size of the original austenite is smaller as the heating temperature of the tube blank is lower, and the size effect can be inherited to the reheated austenite, so that the martensite quenching structure, the tempering structure and the substructure with smaller size can be obtained. The refined grain size can obviously improve the toughness of the steel and slightly improve the strength performance of the steel. The toughness and the strength of the product are improved. Then piercing-rolling the hollow pipe billet by a piercing mill, wherein the piercing-rolling temperature of the pipe billet is 1150-1200 ℃, and the deformation resistance of the piercing mill to the wall-reducing deformation of the hollow pipe billet is small; and (2) performing extension deformation and micro-tension sizing and reducing machine set sizing on the steel pipe after hole expansion and wall reduction by a steel pipe extension rolling machine set, wherein the extension deformation temperature of the steel pipe is not lower than 1000 ℃, then reheating by a heating furnace and rapid water quenching cooling at the cooling speed of 70-80 ℃/s, controlling the cooling to obtain a quenching structure with the martensite accounting for more than 90%, then performing tempering treatment, wherein the tempering temperature of the steel pipe is 620-680 ℃, straightening the steel pipe with the temperature of not lower than 350 ℃ after sizing, and performing flaw detection on the straightened steel pipe.
Example (b):
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 tube are shown in Table 3.
Table 1: chemical composition
Table 2: manufacturing process parameters
Table 3: mechanical properties of the product of the invention
Claims (3)
1. The seamless steel pipe for drilling and production is characterized by comprising the following components in percentage by weight: c: 0.10% -0.14%, Si: 0.55-0.70%, Mn: 0.30% -0.50%, P: less than or equal to 0.010 percent, S: less than or equal to 0.003 percent, Cr: 1.55-1.70%, Mo: 0.50% -0.70%, V: 0.03% -0.05%, 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 percent; the balance being Fe.
2. The seamless steel pipe for drilling and production according to claim 1, wherein the properties are as follows: yield strength: 1000-1150 MPa; the tensile strength is more than or equal to 1080 MPa; impact toughness: the full-size Charpy impact power is more than or equal to 120J; the elongation is more than or equal to 19 percent.
3. The manufacturing method of the seamless steel pipe for drilling and production according to claim 1, characterized by comprising the following process flows: smelting, centrifugally casting a tube blank, sizing, surface treatment, heating the tube blank, piercing, rolling and reaming, extension rolling, reheating, water quenching and cooling, tempering treatment, straightening with temperature and flaw detection; wherein:
1) carrying out centrifugal casting to obtain a hollow tube blank, wherein the centrifugal casting temperature is 1580 and 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 rolling steel pipe is not lower than 1000 ℃;
5) reheating at 880-900 ℃, immediately carrying out rapid water quenching and cooling at the cooling speed of 70-80 ℃/s to obtain a quenching structure with the martensite accounting for more than 90%;
6) the tempering temperature of the steel pipe is 620-680 ℃;
7) straightening the steel pipe with the temperature 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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| CN114836691B CN114836691B (en) | 2023-06-16 |
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|---|---|---|---|---|
| JPH03207814A (en) * | 1990-01-10 | 1991-09-11 | Nippon Steel Corp | Manufacture of low yield ratio high tensile strength steel plate |
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| 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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