CN102660711B - Steel for petroleum casing connecting piece and manufacturing method thereof - Google Patents
Steel for petroleum casing connecting piece and manufacturing method thereof Download PDFInfo
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Classifications
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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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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses steel for a petroleum casing connecting piece and a manufacturing method thereof, and belongs to the technical field of metallurgy. The steel for the petroleum casing connecting piece comprises the following chemical ingredients in percentage by mass: 0.28 to 0.33 percent of C, 0.20 to 0.35 percent of Si, 0.45 to 0.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, 0.90 to 1.10 percent of Cr, 0.18 to 0.25 percent of Mo, 0.020 to 0.050 percent of alt, less than or equal to 0.25 percent of Cu, less than or equal to 2.0*10<4> percent of H, 40*10<4> to 70*10<4> percent of N, less than or equal to 15*10<4> percent of T.O and the balance of Fe and inevitable impurities. The manufacturing method comprises the following production processes: an initial refining process of an electric furnace, a refining process of a ladle furnace (LF), a vacuum degassing (VD) process, a continuous casting process, a casting blank slow cooling process and an inspection and finishing process. The cleanliness, tissue compactness and uniformity of continuous casting round billets for the petroleum casing connecting piece are improved greatly, and the requirement of the steel for the petroleum casing connecting piece is met.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and relates to steel for a petroleum casing connecting piece and a manufacturing method thereof.
Background
The petroleum work as 'industrial blood' has an important function of no substitution in guaranteeing economic development, and along with the rapid development of the petroleum work, the development of oil wells is developed towards deep wells, ultra-deep wells, large displacement and the like. The petroleum casing pipe is a key device widely applied to the field of petroleum exploitation, and mainly functions in fixing a petroleum well wall. Because of the particularity of the oil exploitation process, the quality of the oil casing directly affects the production safety of the oil well, the exterior of the casing is required to bear various bottom stratum pressures and underground water pressures, the interior of the casing is required to bear mud, internal pressure and water vapor pressure, and sometimes corrosion of corrosive liquid and gas, so that the oil casing is required to have excellent comprehensive mechanical properties, namely high compressive failure strength and internal pressure resistant yield strength. The petroleum casing connecting pieces (casing joints, casing cross joints, etc.) are parts for connecting petroleum casings with each other and for running into a well, and a pipe column from a well head to a depth of several kilometers is suspended. Each casing connection must support the weight of the suspended tubular column below and also bear the combined action of various loads such as pulling, pressing, twisting, bending and the like under the use condition, so that high strength is one of the most important performance requirements; meanwhile, the outer wall of the drill rod and the inner wall of the sleeve are seriously abraded due to radial and axial friction between the drill rod and the sleeve, and the abrasion is mostly generated at the connecting part of the drill rod and the sleeve, so that the drill rod and the sleeve are required to have stronger abrasion resistance; oil wells are complicated and require high erosion resistance. In a word, the steel for the petroleum casing pipe connecting piece requires high strength, uniform steel quality, strong erosion resistance and good wear resistance of steel.
The medium-carbon Cr-Mo series quenched and tempered alloy structural steel has excellent service performance and processing performance such as high specific strength, high hardness, high toughness, good hardenability, easy processing and the like, and becomes a common steel grade for steel for petroleum casing pipe connecting pieces. Because the quality requirement of the steel for the petroleum casing pipe connecting piece is strict, the requirement of the forging piece of the steel is ensured to meet the requirement of high-grade flaw detection. At present, a user mainly adopts a steel ingot as a forging raw material, but the steel ingot has the problems of low yield, poor tissue compactness, poor component uniformity and the like, so that the quality stability of the forging is low, the rejection rate is high, and the raw material cost is increased. Therefore, users urgently hope to replace steel ingots with continuous casting round billets as forging raw materials to improve the forging quality and reduce the production cost, but extremely high requirements are provided for the cleanliness, the structural compactness and the uniformity of molten steel of the continuous casting round billets.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the steel for the petroleum casing connecting piece, which has high cleanliness and stable components;
the invention also provides a continuous casting round billet for the petroleum casing pipe connecting piece, the steel for the petroleum casing pipe connecting piece exists in the form of the continuous casting round billet and is used for manufacturing the petroleum casing pipe connecting piece, and the continuous casting round billet has high surface quality, tissue compactness and uniformity;
the invention also provides a preparation method of the continuous casting round billet for the petroleum casing pipe connecting piece. The cleanliness, the structure compactness and the uniformity of the continuous casting round billet for the petroleum casing connecting piece obtained by the method are greatly improved, and the requirements of steel for the petroleum casing connecting piece are met.
The steel for the petroleum casing pipe connecting piece comprises the following chemical components in percentage by mass: c: 0.28-0.33%, Si 0.20-0.35%, Mn: 0.45 to 0.60 percent of the total weight of the alloy, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, and the weight percentage of Cr: 0.90% -1.10%, Mo: 0.18 to 0.25 percent of Alt：0.020%～0.050%，Cu≤0.25%，H≤2.0×10-4%，N：40×10-4%～70×10-4%，T.O≤15×10-4Percent, and the balance of Fe and inevitable impurities.
Wherein, AltRefers to all aluminum; t.o means total oxygen.
The design mechanism of the main components of the present invention will be described in detail below:
c: the strength and hardness of the steel are improved, and the plasticity and toughness are reduced. The carbon content is lower than 0.28 percent, the requirements on strength and hardness are not easy to meet, and the alloy dosage is increased; above 0.33% it is difficult to meet the requirements of plasticity and toughness, and it is easy to cause segregation of continuous casting components and overheating during heating.
Si improves the strength and hardenability of the steel, and the minimum content can play an effective role when being 0.20 percent; when the content is higher, the tempering is easy to generate graphitization, and a banded structure is easy to form in the steel, so that the anisotropy of the steel is increased, and the comprehensive mechanical property is reduced.
Mn: the hardenability of the steel is obviously improved, the pearlite structure is refined, the mechanical property is improved, and the content of the pearlite structure is less than 0.45 percent and can not meet the performance requirement of the steel grade; when the content is too high, the coarsening and tempering brittleness of crystal grains and the segregation tendency of continuous casting billet components are increased, and the maximum content is designed to be 0.60%.
P, S: the cutting performance of the steel is improved, the plasticity and the toughness of the steel are obviously reduced, the tendency of generating cracks in the steel is increased, the comprehensive mechanical property of the steel is deteriorated, the content is more obvious when exceeding 0.025 percent, and the content is reduced as much as possible.
Cr: the strength and the hardenability of the steel are obviously improved, the wear resistance and the corrosion resistance are improved, but the content is too high, and the temper brittleness of the steel is easily increased; according to the requirement of the service performance of steel grades, the chromium content is designed to be 0.90-1.10%.
Mo: obviously improves the hardenability, the impact toughness and the corrosion resistance of the steel and improves the tempering stability. The effect is not obvious when the content is less than 0.18%, and the production cost is increased when the content is too high.
Alt: master and slaveThe grain refining, deoxidation and nitrogen fixation are required, the toughness of the steel is improved, the comprehensive mechanical property of the steel is improved, and the effective effect cannot be achieved when the content is lower than 0.020%; when the content is more than 0.050%, secondary oxidation is easily caused, the fluidity of molten steel is reduced, and the quality of steel is deteriorated.
Cu: when the content of harmful residual elements in the steel is higher than 0.25 percent, the plasticity and the toughness of the steel are reduced, and star-shaped cracks are easy to generate on continuous casting billets.
T.O: the content is increased, the cleanliness of the steel is reduced, the inclusion in the steel is increased, and the total oxygen content is higher than 15 multiplied by 10-4% of the total weight of the steel, the toughness and the fatigue property of the steel are obviously reduced, and the comprehensive mechanical property of the steel is deteriorated.
H: the content is higher than 2.0 multiplied by 10-4Steel is easy to generate white spots, point segregation, fatigue fracture and the like, the quality of the steel is obviously deteriorated, and even steel is scrapped.
N: can improve the strength of steel, and can be combined with Al to generate AlN refined grains with the content higher than 40 multiplied by 10-4% of the total amount of the composition is more than 70X 10-4% of the total amount of the above-mentioned components increases inclusions in the steel, remarkably deteriorates toughness of the steel, and makes the steel susceptible to blue embrittlement.
The steel for the petroleum casing pipe connecting piece exists in the form of a continuous casting round billet and is used for manufacturing the petroleum casing pipe connecting piece.
The invention provides a method for manufacturing the continuous casting round billet for the petroleum casing pipe connecting piece, which comprises the following production procedures: electric furnace primary smelting process → LF refining process → VD vacuum degassing process → continuous casting process → casting blank slow cooling process → inspection and finishing process; wherein,
in the primary smelting process of the electric furnace, the mass percent of molten iron in a furnace burden structure accounts for 50-75%; during the process of slag-free tapping after the initial smelting of the electric furnace is finished, carbon powder is added into a steel ladle in advance according to the actual end point carbon content, and then a mixed slag making material consisting of a pre-melting low-melting-point slag modifier and lime is added.
In the primary smelting process of the electric furnace, after the mixed slagging material is added, an alloy and an aluminum-containing deoxidizer are added, wherein the alloy is at least one of silicomanganese, ferrochromium or ferromolybdenum, and the addition amount of the aluminum-containing deoxidizer is 1.5kg/t steel to 2.0kg/t steel.
In the LF refining process, a refining furnace adopts an LF furnace, the composite deoxidation mode of carbon powder and silicon carbide diffusion deoxidation and feeding of aluminum wire strong deoxidation phase is adopted for deoxidation, and before tapping, silicon calcium wire is fed to perform modification treatment on inclusions and perform deep deoxidation.
And carrying out slag skimming operation after the LF refining process, namely after tapping of the LF furnace and before entering the VD vacuum degassing process, wherein the slag skimming amount accounts for 30-60% of the total slag weight.
In the VD vacuum degassing process, the maintaining time is 15min to 20min under the vacuum degree of 67Pa, and H is less than or equal to 2.0 multiplied by 10 after vacuum treatment-4And wt%, after the molten steel is refined in vacuum and returns to the normal pressure state, controlling the flow of bottom-blown argon to be 120L/min-260L/min, the pressure to be 0.20 MPa-0.40 MPa, and keeping the soft blowing time to be 15 min-30 min, wherein the soft blowing state is that the slag surface is slightly moved, and the molten steel is not exposed.
In the continuous casting process, three constant operations of constant temperature, constant pulling speed and constant liquid level are carried out, argon blowing sealing ladle long nozzle, tundish built-in nozzle, argon blowing sealing submerged nozzle, steel ladle and tundish are all covered and insulated, the liquid level of tundish steel is poured with low-carbon high-alkalinity covering agent and carbonized rice husk double-layer insulated full-protection low-superheat degree, the liquid level of a crystallizer is automatically controlled, the tail end is electromagnetically stirred, dynamic weak cold water distribution is carried out, and a multi-point continuous straightening technology is adopted.
In the casting blank slow cooling process, the continuous casting round billet is cooled by a secondary cooling section, straightened and placed, transferred to a cooling bed by a transportation rod way, transferred to a slow cooling pit for slow cooling in time, covered and kept warm, the slow cooling time is more than or equal to 36 hours, and the hanging temperature is less than or equal to 250 ℃.
The invention has the following beneficial effects:
(1) the electric furnace adopts the technical means of adding high-proportion molten iron, adding a proper amount of carbon powder for deoxidation in advance after the furnace, adding a mixed slag making material consisting of a pre-melting low-melting-point slag making material and lime for modifying the slag, adding an aluminum deoxidizer for strengthening the pre-deoxidation and the like, so that the content of dissolved oxygen in steel is reduced as soon as possible, the slag is formed very early, and good conditions are created for a refining furnace;
(2) the LF refining utilizes technologies such as carbon powder + silicon carbide diffusion deoxidation and feeding aluminum wire strong deoxidation phase composite deoxidation, high-alkalinity refining slag refining, narrow component control and the like, and vacuum degassing refining, and ensures molten steel cleanliness and component stability by formulating measures such as reasonable argon blowing stirring formulation, ensuring sufficient vacuum degassing time and soft blowing time and the like.
(3) Continuous casting adopts three constant operations, full protection low superheat degree pouring, automatic control of crystallizer liquid level, electromagnetic stirring at tail end, dynamic weak cooling water distribution, multipoint continuous straightening, slow cooling in a slow cooling pit, covering and heat preservation and other technologies, so that the surface quality, cleanliness, tissue uniformity and compactness of a continuous casting round billet are ensured, tissue stress and thermal stress are reduced, and internal cracks are avoided.
(4) The preparation method can be used for producing the product with high birth cleanliness (T.O is less than or equal to 15 multiplied by 10)-4%、N：40×10-4%～70×10-4Percent, non-metallic inclusion A, B, C, D is less than or equal to 1.0 grade), and the continuous casting round billet is homogeneous (the macrostructure is less than or equal to 1.0 grade, and has no crack and subcutaneous bubbles), thereby meeting the requirement of ensuring high-grade flaw detection of the steel forging for the petroleum casing pipe connecting piece.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments, but the scope of the present invention is not limited to the following embodiments.
The invention provides a steel for a petroleum casing pipe connecting piece, which comprises the following chemical components in percentage by mass: c: 0.28-0.33%, Si 0.20-0.35%, Mn: 0.45 to 0.60 percent of the total weight of the alloy, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, and the weight percentage of Cr: 0.90% -1.10%, Mo: 0.18 to 0.25 percent of Alt：0.020%～0.050%，Cu≤0.25%，H≤2.0×10-4%，N：40×10-4%～70×10-4%，T.O≤15×10-4Percent, and the balance of Fe and inevitable impurities.
As a preferred embodiment of the invention, the steel for the oil casing connecting piece comprises the following chemical components in percentage by mass: c: 0.29-0.31%, Si: 0.20-0.28%, Mn: 0.50-0.56%, P is less than or equal to 0.015%, S is less than or equal to 0.010%, Cr: 1.00% -1.10%, Mo: 0.18 to 0.22 percent of Alt：0.020%～0.040%，Cu≤0.25%，H≤2.0×10-4%，N：40×10-4%～70×10-4%，T.O≤15×10-4Percent, and the balance of Fe and inevitable impurities.
The invention also provides a continuous casting round billet for the petroleum casing pipe connecting piece, namely the steel for the petroleum casing pipe connecting piece exists in the form of the continuous casting round billet and is used for manufacturing the petroleum casing pipe connecting piece.
The invention provides a preparation method of a continuous casting round billet for a petroleum casing pipe connecting piece, which comprises the following production procedures: electric furnace primary smelting process → LF refining process → VD vacuum degassing process → continuous casting process → casting blank slow cooling process → inspection and finishing process;
the following percentages are all mass percentages unless otherwise specified.
An electric furnace primary smelting process: a charging material structure of scrap steel and molten iron is adopted, wherein the molten iron accounts for 50-75% by mass; oxygen blowing and decarburization are mainly carried out by oxygen lances on four furnace walls, and oxygen blowing and decarburization are carried out by oxygen lances on one furnace door; blowing carbon powder or other carbon-containing powder to make foamed slag by combining with oxygen blowing; adding slag-making materials such as lime for slagging and dephosphorization; tapping at the eccentric furnace bottom, and remaining steel and slag; during tapping, bottom blowing argon gas for stirring;
preferably, the mass percent of molten iron in the furnace charge structure is 55-75%;
preferably, when carbon powder or other carbon-containing powder is injected to produce foam slag, the carbon blending amount accounts for 1.00-4.00% of the total weight of the furnace burden, and is determined by the structure and components of the furnace burden;
preferably, 35kg to 50kg of lime is added to each ton of furnace burden for slagging and dephosphorization, the molten carbon is more than or equal to 0.60 percent, such as 0.6 to 1.5 percent, preferably 0.8 to 1.2 percent, more preferably 0.9 to 1.1 percent, the molten phosphorus is less than or equal to 0.025 percent, meanwhile, the furnace burden is oxidized, decarburized and uniformly boiled, partial H and N in steel are removed, and the smelting endpoint C of the primary smelting furnace is controlled: 0.12 to 0.20 percent of steel tapping temperature, wherein P is less than or equal to 0.015 percent, and the steel tapping temperature is 1620 to 1660 ℃;
preferably, the electric furnace is an alkaline electric arc furnace;
in the electric furnace primary smelting process, in the slag-free tapping process after the electric furnace primary smelting is finished, carbon powder is added into a steel ladle in advance according to the actual end point carbon content in the tapping process along the steel flow, then a pre-melted low-melting-point slag modifier and a mixed slag making material consisting of lime are added, wherein the pre-melted low-melting-point slag modifier and the lime in the mixed slag making material are mixed according to the weight ratio of 1: 1, the adding amount of the mixed slag making material in the steel ladle is 10kg/t steel-15 kg/t steel, preferably, the pre-melted low-melting-point slag modifier comprises the following components in percentage by mass: 40 to 60 weight percent of SiO2：4wt%～20wt%，Al2O3: 15wt% -35 wt%, MgO: 5wt% -15 wt%; adding an alloy and an aluminum-containing deoxidizer after adding the mixed slagging material, wherein the alloy is one or more of silicomanganese, ferrochromium and ferromolybdenum, but the invention is not limited to the alloy, and the specific addition type and the addition amount of the alloy are determined according to the components of steel; the addition amount of the aluminum-containing deoxidizer is 1.5kg/t steel to 2.0kg/t steel; argon blowing and stirring are carried out in the slag-free tapping process, the argon pressure is controlled to be 1.40 MPa-0.80 MPa in the early stage and the middle stage of tapping, the argon pressure is controlled to be 0.60 MPa-0.20 MPa in the later stage, and after tapping is finished, the flow of the argon is controlled to enable the slag surface to slightly move before the molten steel is transferred to a refining station.
An LF refining procedure: the refining furnace adopts an LF furnace, the temperature of molten steel is controlled to be 1500-1550 ℃ at the station of the LF furnace, preferably 1530-1550 ℃, and the molten steel is subjected to processes of electric slagging, slag mixing, wire feeding, stirring and the like in the refining furnace to complete the deoxidation, the desulfurization, inclusion removal, component adjustment, temperature control and other treatment processes. The method comprises the steps of performing diffusion deoxidation by adopting carbon powder and silicon carbide, feeding an aluminum wire strong deoxidation phase before analyzing a primary sample, and performing modification treatment and deep deoxidation on inclusions by feeding a calcium-silicon wire before tapping, wherein the weight ratio of the carbon powder to the silicon carbide is 1: 1-5: 1, the consumption is 1kg/t steel-2 kg/t steel, the consumption of the aluminum wire is 0.8kg/t steel-1.0 kg/t steel, and the consumption of the calcium-silicon wire is 0.010kg/t steel-0.015 kg/t steel. The tapping temperature is controlled to be 1600-1650 ℃, and is preferably 1600-1620 ℃.
Preferably, in the LF refining process, the holding time of the LF refining white slag is more than or equal to 20min, preferably 25-35 min, and the mass percentages of the main components of the final slag are controlled as follows: CaO: 45 to 55 percent of SiO2：10%～15%，Al2O3：15%～25%，FeO+MnO≤1.0%，MgO：6%～10%。
Preferably, in the LF refining process, the LF furnace refining performs narrow component control on the molten steel, and the same batch: c: ± 0.01%, Si: +/-0.03%, Mn and Cr: ± 0.02%, Mo: ± 0.01%, Al: plus or minus 0.005 percent.
After tapping from an LF furnace, carrying out slag skimming operation before entering a VD vacuum degassing process, wherein the slag skimming amount is 30-60% of the total slag mass;
VD vacuum degassing process: the vacuum refining furnace adopts a VD furnace, mainly completes the H removal of molten steel, further promotes the floating of impurities and purifies the molten steel. Measuring the temperature of the steel ladle to a VD furnace station, vacuumizing and carrying out vacuum degassing treatment, wherein the holding time is 15-20 min under the vacuum degree of 67Pa, and H is less than or equal to 2.0 multiplied by 10 after the vacuum treatment-4wt%；
And after the molten steel is refined in vacuum and returns to the normal pressure state, the molten steel enters a soft blowing treatment stage, the flow rate of bottom blowing argon is controlled to be 120L/min-260L/min, the pressure is 0.20 MPa-0.40 MPa, and the soft blowing time is kept to be 15 min-30 min, wherein the soft blowing state is that the slag surface is slightly moved, and the molten steel is not exposed.
And (3) continuous casting process: the method is characterized in that three constant operations of constant temperature, constant pulling speed and constant liquid level are carried out, argon blowing seal large ladle long water gap, tundish built-in water gap and argon blowing seal immersion water gap are adopted, steel ladle and tundish are all covered and insulated, the liquid level of tundish steel is poured with low-carbon high-alkalinity covering agent and carbonized rice husk double-layer insulation full-protection low superheat degree, the liquid level of a crystallizer is automatically controlled, the tail end is electromagnetically stirred, dynamic weak cold water distribution is carried out, and a multi-point continuous straightening technology is adopted;
preferably, in the continuous casting procedure, the molten steel level of the tundish in normal casting is 850 mm-900 mm, and the electric stirring parameters at the tail end are as follows: 400A/18.0HZ, the superheat degree of molten steel pouring is 15-25 ℃, and the water distribution ratio of each continuous casting cooling section is as follows: 30% of a foot roller section, 24% of a secondary cooling section, 19% of a secondary cooling section, 15% of a secondary cooling section and 12% of a secondary cooling section, wherein the specific water amount is 0.30L/kg-0.35L/kg;
preferably, an embedded five-frame continuous withdrawal and straightening machine is adopted, the casting blank straightening temperature is more than or equal to 910 ℃, such as 910-950 ℃, preferably the casting blank straightening temperature is 915-925 ℃, and when the section specification is phi 350mm, the pulling speed is controlled at 0.35-0.42 m/min.
A casting blank slow cooling process: and (3) cooling the continuous casting round billet in a secondary cooling section, straightening, transferring the continuous casting round billet to a cooling bed through a conveying rod way, timely transferring the continuous casting round billet to a slow cooling pit for slow cooling, covering the slow cooling pit for heat preservation, wherein the slow cooling time is not less than 36h, preferably 40-48 h, the hoisting temperature is not more than 250 ℃, and preferably 200-150 ℃.
And (3) checking and finishing: and checking the surface quality of the continuous casting round billet, checking and analyzing the internal quality, and performing finishing and polishing treatment on the surface and the end part of the continuous casting round billet.
The following are four specific examples of the continuous casting round billet for the petroleum casing pipe connecting piece prepared by adopting different process parameters, and the number of the continuous casting round billet is 1#, 2#, 3#, and 4 #.
1. The main control process parameters of the four examples in the primary smelting process of the electric arc furnace are shown in tables 1 and 2.
TABLE 1 Primary smelting process parameters of electric arc furnace
TABLE 2 Main Process parameters of tapping after completion of the initial smelting of an electric arc furnace
2. The main control process parameters and the final slag main components of the LF refining procedure, the four examples are shown in tables 3 and 4 respectively
TABLE 3LF refining Primary control Process parameters
Table 4LF refining final slag main components (mass%,%)
3. The main control process parameters of the four examples in the VD vacuum degassing process are shown in Table 5, wherein 50wt% of refining slag is removed before the steel ladle is placed into the VD furnace.
TABLE 5 vacuum refining control Process parameters of VD furnace
4. In the continuous casting process, a full-arc three-machine three-flow square/round billet alloy steel continuous casting machine is adopted for continuous casting in the four embodiments, the arc radius is R12m, the round billet specification is phi 350mm, the liquid level of the molten steel in the tundish during normal casting is 850 mm-900 mm, the liquid level of the crystallizer is automatically controlled, and the electromagnetic stirring parameters at the tail end are as follows: 400A/18.0HZ, the superheat degree of molten steel pouring is 15-25 ℃, the dynamic gas-fog cooling is used for weak cold water distribution, and the water distribution ratio of each cooling section is as follows: 30% of a foot roller section, 24% of a secondary cooling section, 19% of a secondary cooling section, 15% of a secondary cooling section and 12% of a secondary cooling section; the embedded six-frame four-point continuous casting straightening and withdrawal straightening machine is adopted, the straightening temperature of the casting blank reaches 920 ℃, and other control process parameters are shown in a table 6.
TABLE 6 continuous casting control Process parameters
5. Casting blank slow cooling process
And (3) cooling the continuous casting round billet by a secondary cooling section, straightening, transferring the continuous casting round billet to a cooling bed by a conveying rod way, timely transferring the continuous casting round billet to a slow cooling pit for slow cooling, covering the continuous casting round billet for heat preservation, wherein the slow cooling time is 48h, and the hoisting temperature is 200-150 ℃.
The chemical compositions of the continuous casting round billets for the petroleum casing connections obtained in the four examples are shown in table 7; and the results of the low-power and non-metallic inclusion test on the phi 350mm continuous casting round billet steel produced by the four examples are shown in tables 8 and 9.
Table 7 components (mass%,%) of the steel of the present invention
From table 7, it can be seen that the chemical components in the continuous casting round billet steel for producing the petroleum casing connecting piece by the preparation method of the invention are stably controlled, the narrow component control of the molten steel is realized by the LF furnace refining, and the steel is prepared by the following steps in the same batch: c: ± 0.01%, Si: +/-0.03%, Mn and Cr: ± 0.02%, Mo: ± 0.01%, Al: plus or minus 0.005 percent.
TABLE 8 Low magnification organization of continuous casting round billet of the invention (grade)
TABLE 9 non-metallic inclusion (grade) of continuous casting round billet of the invention
As can be seen from tables 8 and 9: the continuous casting round billet for producing the petroleum casing connecting piece by the preparation method has the characteristics of compact and uniform structure, higher cleanliness and the like.
Claims (14)
1. A method for manufacturing a continuous casting round billet for an oil casing connecting piece comprises the following production procedures: an electric furnace primary smelting process → an LF refining process → a VD vacuum degassing process → a continuous casting process → a casting blank slow cooling process → an inspection and finishing process, which is characterized in that,
the continuous casting round billet for the petroleum casing pipe connecting piece comprises the following chemical components in percentage by mass: 0.28-0.33%, Si 0.20-0.35%, Mn: 0.45 to 0.60 percent of the total weight of the alloy, less than or equal to 0.025 percent of P, less than or equal to 0.025 percent of S, and the weight percentage of Cr: 0.90% -1.10%, Mo: 0.18 to 0.25 percent of Alt：0.020%～0.050%，Cu≤0.25%，H≤2.0×10-4%，N：40×10-4%～70×10-4%，T.O≤15×10-4Percent, the balance being Fe and inevitable impurities;
in the primary smelting process of the electric furnace, the mass percent of molten iron in a furnace burden structure accounts for 50-75%; during the process of slag-free tapping after the initial smelting of the electric furnace is finished, carbon powder is added into a steel ladle in advance according to the actual end point carbon content, and then a mixed slag making material consisting of a pre-melting low-melting-point slag modifier and lime is added;
in the continuous casting process, three constant operations of constant temperature, constant pulling speed and constant liquid level are carried out, argon blowing sealing ladle long nozzle, tundish built-in nozzle, argon blowing sealing submerged nozzle, steel ladle and tundish are all covered and insulated, the liquid level of tundish steel is poured with low-carbon high-alkalinity covering agent and carbonized rice husk double-layer insulated full-protection low-superheat degree, the liquid level of a crystallizer is automatically controlled, the tail end is electromagnetically stirred, dynamic weak cold water distribution is carried out, and a multi-point continuous straightening technology is adopted; wherein the liquid level of the molten steel in the tundish in normal pouring is 850 mm-900 mm, the electric stirring and stirring parameters at the tail end are 400A/18.0HZ, the superheat degree of the molten steel pouring is 15-25 ℃, and the water distribution ratio of each section of continuous casting cooling is as follows: 30% of foot roller section, 24% of secondary cooling first section, 19% of secondary cooling second section, 15% of secondary cooling third section and 12% of secondary cooling fourth section, and the specific water amount is 0.30L/kg-0.35L/kg.
2. The manufacturing method according to claim 1, characterized in that: in the primary smelting process of the electric furnace, the pre-melted low-melting-point slag modifier and the lime in the mixed slag making material are mixed according to the weight ratio of 1: 1, and the adding amount of the mixed slag-making material in the steel ladle is 10kg/t steel to 15kg/t steel.
3. The manufacturing method according to claim 1 or 2, characterized in that: in the primary smelting process of the electric furnace, the pre-melted low-melting-point slag modifier comprises the following components in percentage by mass: 40 to 60 weight percent of SiO2：4wt%～20wt%，Al2O3：15wt%～35wt%，MgO：5wt%～15wt%。
4. The manufacturing method according to claim 1, characterized in that: in the primary smelting process of the electric furnace, after the mixed slagging material is added, an alloy and an aluminum-containing deoxidizer are added, wherein the alloy is at least one of silicomanganese, ferrochromium or ferromolybdenum, and the addition amount of the aluminum-containing deoxidizer is 1.5kg/t steel to 2.0kg/t steel.
5. The manufacturing method according to claim 1, characterized in that: in the electric furnace primary smelting process of the electric furnace primary smelting procedure, the carbon blending amount is 1.00-4.00 wt%, the molten carbon is more than or equal to 0.60wt%, the molten phosphorus is less than or equal to 0.025wt%, and the smelting end point C: 0.12 to 0.20 weight percent, less than or equal to 0.015 weight percent of P and the tapping temperature of 1620 to 1660 ℃.
6. The manufacturing method according to claim 1, characterized in that: in the initial smelting process of the electric furnace, argon is blown and stirred in the tapping process, the argon pressure is controlled to be 1.40-0.80 MPa in the early stage and the middle stage of tapping, the argon pressure is controlled to be 0.60-0.20 MPa in the later stage, and after tapping is finished, the argon flow is controlled to enable the slag surface to slightly move before the molten steel is transferred to a refining station.
7. The manufacturing method according to claim 1, characterized in that: in the LF refining process, a refining furnace adopts an LF furnace, the composite deoxidation mode of carbon powder and silicon carbide diffusion deoxidation and feeding of aluminum wire strong deoxidation phase is adopted for deoxidation, and before tapping, silicon calcium wire is fed to perform modification treatment on inclusions and perform deep deoxidation.
8. The manufacturing method according to claim 7, characterized in that: the weight ratio of the carbon powder to the silicon carbide is 1: 1-5: 1, the dosage of the steel is 1kg/t to 2kg/t, the dosage of the aluminum wire is 0.8kg/t to 1.0kg/t, and the dosage of the calcium-silicon wire is 0.010kg/t to 0.015 kg/t.
9. The manufacturing method according to claim 1, characterized in that: in the LF refining processThe holding time of LF refining white slag is more than or equal to 20min, and the mass percent of the main components of the final slag is controlled as follows: CaO: 45 to 55 percent of SiO2：10%～15%，Al2O3：15%～25%，FeO＋MnO≤1.0%，MgO：6%～10%。
10. The manufacturing method according to claim 1, characterized in that: in the LF refining process, the LF furnace refining controls the narrow components of the molten steel, and the refining in the same batch: c: ± 0.01%, Si: +/-0.03%, Mn and Cr: ± 0.02%, Mo: ± 0.01%, Al: plus or minus 0.005 percent.
11. The manufacturing method according to claim 1, characterized in that: and carrying out slag skimming operation after the LF refining process, namely after tapping of the LF furnace and before entering the VD vacuum degassing process, wherein the slag skimming amount accounts for 30-60% of the total slag weight.
12. The manufacturing method according to claim 1, characterized in that: in the VD vacuum degassing process, the maintaining time is 15min to 20min under the vacuum degree of 67Pa, and H is less than or equal to 2.0 multiplied by 10 after vacuum treatment-4And wt%, after the molten steel is refined in vacuum and returns to the normal pressure state, controlling the flow of bottom-blown argon to be 120L/min-260L/min, the pressure to be 0.20 MPa-0.40 MPa, and keeping the soft blowing time to be 15 min-30 min, wherein the soft blowing state is that the slag surface is slightly moved, and the molten steel is not exposed.
13. The manufacturing method according to claim 1, characterized in that: in the continuous casting process, an embedded 6-frame four-point continuous casting straightening withdrawal and straightening machine is adopted, the casting blank straightening temperature is more than or equal to 910 ℃, and the drawing speed is controlled to be 0.35-0.42m/min when the section specification is phi 350 mm.
14. The manufacturing method according to claim 1, characterized in that: in the casting blank slow cooling process, the continuous casting round billet is cooled by a secondary cooling section, straightened and placed, transferred to a cooling bed by a transportation rod way, transferred to a slow cooling pit for slow cooling in time, covered and kept warm, the slow cooling time is more than or equal to 36 hours, and the hanging temperature is less than or equal to 250 ℃.
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| CN201310468761.5A CN103572165B (en) | 2012-05-23 | 2012-05-23 | Petroleum casing pipe web member steel and manufacture method thereof |
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| CN103695785B (en) * | 2013-12-11 | 2016-08-17 | 莱芜钢铁集团有限公司 | A kind of cryogenic high pressure conduit coupling steel and the manufacture method of continuous cast round billets thereof |
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| CN108977624A (en) * | 2018-08-31 | 2018-12-11 | 包头钢铁（集团）有限责任公司 | Refining slag |
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| CN113337672B (en) * | 2021-06-23 | 2022-07-29 | 承德建龙特殊钢有限公司 | Method for controlling inclusions in refining furnace process of bearing steel |
| CN114717479B (en) * | 2022-04-08 | 2022-12-16 | 承德建龙特殊钢有限公司 | Steel for oil clothing valve body and preparation method thereof |
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