CN114774659A - Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline - Google Patents

Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline Download PDF

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CN114774659A
CN114774659A CN202210571570.0A CN202210571570A CN114774659A CN 114774659 A CN114774659 A CN 114774659A CN 202210571570 A CN202210571570 A CN 202210571570A CN 114774659 A CN114774659 A CN 114774659A
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rolling
temperature
finish rolling
steel
steel coil
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冯宇阳
李孝明
石晓鑫
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Xinjiang Bayi Iron and Steel Co Ltd
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Xinjiang Bayi Iron and Steel Co Ltd
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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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
    • 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
    • C21D11/00—Process control or regulation for heat treatments
    • C21D11/005—Process control or regulation for heat treatments for cooling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
    • C21D8/0226—Hot rolling
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
    • C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a method for manufacturing a microalloy steel coil for an oil and gas conveying pipeline, which comprises the following steps: heating, rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling, and rolling the continuous casting plate blank into a steel coil with the thickness of 4-7 mm; the heating temperature of the continuous casting plate blank is 1150-1200 ℃, the rough rolling temperature is 1100-1150 ℃, the total deformation amount of rough rolling is 70-80%, the hot rolling temperature is 1080-1130 ℃, the finish rolling temperature is 850-900 ℃, the total deformation amount of finish rolling is 60-80%, the finish rolling temperature is 830-850 ℃, and the curling temperature is 500-550 ℃; the steel comprises the following chemical elements in percentage by mass: c: 0.035 to 0.045; si: 0.15 to 0.25; mn: 1.55-1.65; s: less than or equal to 0.003; ni: 0.05 to 0.10; p: 0.010-0.015; cr: 0.20 to 0.25; mo: 0.15 to 0.25; cu: 0.05 to 0.10; al: 0.015 to 0.040; nb: 0.055 to 0.075; v: 0.035 to 0.045%; ti: 0.020-0.025%; n: 70 to 100 ppm.

Description

Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline
Technical Field
The invention relates to a manufacturing method of a microalloy steel coil for an oil and gas conveying pipeline.
Background
In recent years, with the continuous upgrade of the oil and gas transportation industry, the range and distance of the oil and gas transportation industry are continuously increased, and the performance requirements on oil and gas pipelines are increasingly increased. In actual service engineering, petroleum and natural gas pipelines are required to bear internal pressure of internal transported objects, external pressure of external natural environment and other injuries, so that the petroleum and natural gas pipelines have good mechanical properties. At present, X70-grade petroleum and natural gas transportation pipelines with good mechanical properties are successfully developed, the high strength, the good toughness and the good plasticity are widely accepted by the market, but at present, steel coils for X70-grade petroleum and natural gas transportation pipelines are mostly rolled by 7-pass or 8-pass finish rolling process, the rolling time is long, and the rolling energy consumption is high; secondly, from the aspect of steel making, the steel with the microalloy element X70 grade has been successfully developed, but due to the defects of the rolling process, most elements exist in the matrix of the steel coil structure only, and a large amount of microalloy element compounds beneficial to improving the performance of the steel coil are not formed, so that the alloy elements are not fully utilized; finally, the steel coil for the X70-grade petroleum and natural gas transport pipe usually adopts a lower finish rolling temperature during rolling, so that the rolling force is increased, the residual stress in the material is improved, the increase of the residual stress has adverse effect on the shape of the steel coil, and the product percent of pass is reduced.
And (3) document retrieval:
(1) patent application No. CN202011296866.3 discloses a 'manufacturing process of a steel coil', wherein the steel plate is sent into an annealing furnace for an annealing procedure after being curled, so that the residual stress in the product is effectively eliminated, and the product percent of pass is favorably improved. The annealing process has the disadvantages that the steel coil is reheated, the production efficiency is reduced, the energy consumption is increased, and the production cost is increased.
(2) Patent application number 201710767825.X discloses 'an X70 pipeline steel hot-rolled plate coil and a production method thereof', and the X70 pipeline steel hot-rolled plate coil comprises the following components: "C: 0.05 to 0.07; si: 0.15 to 0.25; mn: 1.60 to 1.75; p: less than or equal to 0.021; s: less than or equal to 0.005; nb: 0.055-0.065; ti: 0.010-0.020%; al: 0.020 to 0.040; cr: 0.15 to 0.25; n: less than or equal to 50ppm ", which has the disadvantage that the Nb (C, N) precipitates are not effectively controlled. According to the solid solubility product formula of NbC and NbN:
Figure DEST_PATH_IMAGE002
，
Figure DEST_PATH_IMAGE004
the precipitation temperatures of NbC and NbN are calculated to be about 1075 ℃ and 1093 ℃, the initial rolling temperature of the rough rolling procedure is 1140-1160 ℃, and then the finish rolling procedure is directly carried out, so that proper precipitation time is not left for the precipitation of Nb (C, N), alloy elements are not fully utilized, and waste is caused. And the 7-pass finish rolling process is adopted, so that the rolling time is longer, and the rolling energy consumption is higher.
(3) Patent application No. 201711333527.6 discloses "a low hardness X70M pipeline steel hot rolled coil and a manufacturing method thereof", which "rolling process: the continuous casting plate blank is directly subjected to hot charging heating at the temperature of 500-850 ℃, the continuous casting plate blank is heated to 1150-1200 ℃ by a stepping heating furnace and discharged, then the continuous casting plate blank is subjected to controlled rolling by a rough rolling unit and a finishing rolling unit, the finish rolling temperature of the rough rolling is 980-1050 ℃, the finish rolling start temperature is 910-960 ℃, the finish rolling temperature is 780-840 ℃, then the plate coil is rapidly cooled at the speed of 12-30 ℃/s by adopting a laminar cooling mode, and the plate coil is coiled at the temperature of 470-530 ℃. The method has the defects that the deformation of the plate blank in each pass of rough rolling and finish rolling is not controlled, the plate blank is completely and dynamically recrystallized without using a controlled rolling technology, and the method is not beneficial to the refinement of austenite grains.
(4) Patent application No. 200910011961.1 discloses "a high-strength economical X70 pipeline steel hot-rolled flat plate and a production method thereof", the composition of which is: "C: 0.02-0.08; si: 0.10-0.35; mn: 1.40-1.70; p: less than or equal to 0.020; s: less than or equal to 0.005; and (3) Alt: 0.020-0.045; nb: 0.04-0.07; ti: 0.008-0.030; the strength of the product is effectively improved by utilizing Nb, Al, Ti and other alloy elements, but the cooling process after rolling is not effectively controlled, and the cooling speed is too high, so that the interior of the material still has high residual stress, and the toughness and the plasticity of the material are reduced.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a method for manufacturing a microalloy steel coil for an oil and gas conveying pipeline. The controlled rolling and cooling technology is combined with the micro-alloying theory, and the controlled rolling and cooling are carried out on the continuous casting plate blank by adopting a 6-pass finish rolling process, so that the rolling efficiency is effectively improved, and the energy consumption is reduced; and the solid solution and precipitation of microalloy elements in the rolling process are controlled at different temperatures by utilizing the microalloying theory, so that the utilization rate of the alloy elements in the steel is improved.
The technical scheme adopted by the invention is a manufacturing method of a microalloy steel coil for an oil and gas transmission pipeline, which comprises the following steps: heating, rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling, and rolling the continuous casting plate blank into a steel coil with the thickness of 4-7 mm; the heating temperature of the continuous casting plate blank is 1150-1200 ℃, the rough rolling temperature is 1100-1150 ℃, the total deformation amount of rough rolling is 70-80%, the hot rolling temperature is 1080-1130 ℃, the finish rolling temperature is 850-900 ℃, the total deformation amount of finish rolling is 60-80%, the finish rolling temperature is 830-850 ℃, and the curling temperature is 500-550 ℃;
the steel comprises the following chemical elements in percentage by mass: c: 0.035 to 0.045; si: 0.15 to 0.25; mn: 1.55 to 1.65; s: less than or equal to 0.003; ni: 0.05 to 0.10; p: 0.010-0.015; cr: 0.20 to 0.25; mo: 0.15 to 0.25; cu: 0.05 to 0.10; al: 0.015 to 0.040; nb: 0.055-0.075; v: 0.035-0.045%; ti: 0.020-0.025%; n: 70-100 ppm, the N element is residual after steel making, no extra addition is needed, and the balance is Fe and impurities.
Specifically, the rolling heating temperature of 1150-1200 ℃ is adopted, so that microalloy elements in the plate blank can be fully and fixedly dissolved in an austenite matrix, and are precipitated from the matrix in the form of fine and dispersed granular second phases such as Nb (C, N), V (C, N) and TiC along with the reduction of the temperature in the subsequent rolling process, and the crystal grain boundary is "pinned" to achieve the effect of refining crystal grains, and meanwhile, the effect of dispersion strengthening can be achieved, and the strength of the material is effectively improved.
The heating time in the furnace during heating is 100-200 min, the proper heating time can ensure that the plate blank has good plastic processing performance, the proper rolling temperature of the center of the plate blank cannot be ensured if the time is too short, and metal molecules have higher Gibbs free energy if the time is too long, so that crystal grains are promoted to grow up, and the comprehensive mechanical property of the product is reduced. The tapping temperature is 1130-1180 ℃, and the aim is to ensure that the metallographic structure of the plate blank is an austenite single phase and the plate blank has excellent plastic processing performance.
Wherein the rough rolling temperature is 1100-1150 ℃, the rough rolling procedure is completed in 7 passes, and the total deformation of rough rolling is 70-80%. From the Zener-Hollomon regression equation Z = ꜫ exp (Q/RT), it is known that the occurrence of dynamic recrystallization is mainly determined by the relationship between the temperature compensated deformation rate factor Z and the deformation amount ꜫ, where Z is the temperature compensated deformation rate factor, Q is the deformation activation energy, R is the gas constant, and T is the absolute temperature, and it is known that when the temperature compensated deformation rate Z is constant (i.e., the temperature is constant), the more complete the material is dynamically recrystallized as the deformation amount ꜫ increases. Therefore, the sufficient deformation amount is adopted for controlling the deformation of each pass, so that the complete dynamic recrystallization can be more easily generated in the rolling process of the plate blank, the nucleation rate of plate blank crystal grains is improved, and the effect of refining the crystal grains is achieved. The deformation of each pass is 25-30%, and the purpose is to prevent complete dynamic recrystallization of the plate blank due to small deformation and cracking of the plate blank due to large deformation, ensure complete dynamic recrystallization of the plate blank, improve the nucleation rate and achieve the effect of refining grains.
The hot rolling temperature is 1000-1050 ℃, and the appropriate rolling temperature can fully separate out Nb (C, N) second phase particles in the material, pin crystal boundaries in subsequent processes, prevent crystal grains from growing, and ensure that the product has finer crystal grains finally.
The finish rolling is finished in 6 passes, wherein the start rolling temperature of finish rolling is 850-900 ℃, the finish rolling temperature is 830-850 ℃, the total deformation is 60-80%, the deformation of the 1 st to 4 th passes is 25-40%, and the deformation of the 5 th and 6 th passes is 5-10%. The lower finish rolling starting temperature increases the pressure required by plastic deformation of the material, provides sufficient energy for dynamic recrystallization of the material, improves the nucleation rate of the material and refines grains. The finishing rolling temperature is 830-850 ℃, so that a large amount of fine and dispersedly distributed V (C, N) and TiC second-phase particles can be separated out in the finish rolling process of the material, the dispersion strengthening effect is achieved, and the strength of the material is effectively improved.
Wherein the laminar cooling process is to quickly pass the steel sheet obtained after the finish rolling through a cooling line with water flow jet on the upper part and the lower part, firstly cool the steel sheet to 550-600 ℃ at a cooling speed of 10-15 ℃/S, and ensure that the material is uniformly cooled to Ac at a faster cooling speed1The energy for growing the crystal grains is reduced at a certain temperature, the time for growing the crystal grains is shortened, the growth of the crystal grains is limited, and the function of controlling the grain size is achieved; in addition, the size of ferrite in the material structure can be effectively refined by a higher cooling speed, and a plate blank with good structure uniformity and higher mechanical property is obtained. And continuously cooling the steel coil to 500-550 ℃ at a cooling speed of 5-7 ℃/S to ensure that the coiled steel coil has enough self-tempering temperature.
The curling temperature is 500-550 ℃, and the proper curling temperature can enable the material to still have higher temperature after the curling is finished, so that the steel coil is promoted to carry out self-tempering by utilizing waste heat, the residual stress existing in the rolled steel coil is eliminated, the steel coil is ensured to have higher toughness and plasticity, and the product percent of pass is improved.
By adopting the manufacturing method of the microalloy steel coil for the petroleum and natural gas conveying pipeline, the austenite grain size of the manufactured steel coil is 13-13.5 grade, the tensile strength is more than 630MPa, the yield strength is more than 540MPa, the yield ratio is more than 0.85, and the elongation is more than 35%; the structure of the obtained steel coil is fine and uniform acicular ferrite.
Has the beneficial effects that: the hot-rolled steel coil prepared by the invention achieves the related technical requirements of petroleum and natural gas conveying pipelines, simultaneously utilizes the microalloy elements to effectively refine the grain size of the steel coil, improves the strength, toughness and plasticity of materials, plays the roles of fine grain strengthening and dispersion strengthening, effectively improves the comprehensive mechanical property of the steel coil, simultaneously effectively eliminates the residual stress in the traditional hot-rolled steel coil, greatly reduces the quality problems of poor shape and cracking of the steel coil, and obtains good economic benefit and social benefit.
Detailed Description
Example 1
Adding a mixture containing chemical elements C: 0.044; si: 0.24; mn: 1.65; s: 0.002; ni: 0.09; p: 0.015; cr: 0.24; mo: 0.23; cu: 0.07; al: 0.038; nb: 0.073; v: 0.042 percent; ti: 0.025%; n: 100 ppm. Heating the steel with the balance of Fe and impurities to 1200 ℃, keeping the temperature in the furnace for 200min, and discharging at 1180 ℃; rolling the material through rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling processes, wherein the rough rolling temperature is 1150 ℃, 7 times of rolling are performed, the deformation amount of the 1 st to 7 th times is 30%, a plate blank with the thickness of 250mm is rolled into a sheet with the thickness of 35mm, and then a hot rolling process is performed through a hot rolling box, and the hot rolling temperature is 1050 ℃; performing finish rolling on the hot-rolled plate blank by using a finish rolling machine, wherein the finish rolling starting temperature is 900 ℃, the 1 st pass deformation is 30%, the 2 nd to 4 th pass deformation is 40%, the 5 th and 6 th pass deformations are 10%, and the finish rolling temperature is 850 ℃, and rolling the plate blank into a 4 mm-thick sheet; then the steel sheet obtained after finish rolling rapidly passes through a cooling line with water flow injection at the upper part and the lower part, the steel sheet is cooled to 596 ℃ at the cooling speed of 15.0 ℃/S, and then the steel sheet is continuously cooled to 548 ℃ at the cooling speed of 7.0 ℃/S; and finally, curling the cooled thin plate, wherein the curling temperature is 540 ℃, bundling the thin plate, and cooling to room temperature to obtain the steel coil.
Example 2
Adding a mixture containing chemical elements C: 0.036; si: 0.18 of; mn: 1.58; s: 0.001; ni: 0.08; p: 0.010; cr: 0.21; mo: 0.20; cu: 0.07; al: 0.031; nb: 0.065; v: 0.037%; ti: 0.020-0.025%; n: 90 ppm. Heating the steel with the balance of Fe and impurities to 1180 ℃, keeping the temperature in the furnace for 185min, and discharging at 1156 ℃; rolling the material by rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling processes, wherein the rough rolling temperature is 1135 ℃, the deformation of the rough rolling is 40% in all 1 to 5 passes and 28% in all 6 to 7 passes after 7 passes of rolling, rolling a plate blank with the thickness of 250mm into a thin plate with the thickness of 34mm, and then performing the hot rolling process by a hot rolling box, wherein the hot rolling temperature is 1027 ℃; carrying out finish rolling on the hot-rolled plate blank by a finish rolling machine, wherein the finish rolling starting temperature is 873 ℃, the 1 st pass deformation is 38%, the 2 nd to 4 th pass deformation is 38%, the 5 th and 6 th pass deformations are 8%, the 6 th pass deformation is 5%, and the finish rolling temperature is 846 ℃, and rolling the plate blank into a thin plate with the thickness of 5 mm; rapidly passing the steel sheet obtained after the finish rolling through a cooling line with water flow jet on the upper part and the lower part, cooling the steel sheet to 582 ℃ at the cooling speed of 13.8 ℃/S, and continuously cooling the steel sheet to 542 ℃ at the cooling speed of 6.5 ℃/S; and finally, curling the cooled thin plate, wherein the curling temperature is 539 ℃, bundling the thin plate, and cooling to room temperature to obtain the steel coil.
Example 3
Adding a mixture containing chemical elements C: 0.038; si: 0.18 of; mn: 1.53; s: 0.002; ni: 0.07; p: 0.013; cr: 0.22; mo: 0.18 of; cu: 0.08; al: 0.028; nb: 0.062; v: 0.041 percent; ti: 0.022%; n: 80ppm of the total amount of the components. Heating the steel with the balance of Fe and impurities to 1176 ℃, keeping the temperature in the furnace for 160min, and discharging at 1154 ℃; rolling the material by rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling processes, wherein the rough rolling temperature is 1163 ℃, the 1 st pass deformation is 30 percent, the 2 nd to 5 th pass deformations are 40 percent, the 6 th to 7 th pass deformations are 25 percent after 7 passes of rolling, rolling a plate blank with the thickness of 250mm into a sheet with the thickness of 33mm, and then carrying out the hot rolling process by a hot rolling box, wherein the hot rolling temperature is 1046 ℃; performing finish rolling on the hot-rolled plate blank by using a finish rolling machine, wherein the finish rolling starting temperature is 880 ℃, the 1 st pass deformation is 35%, the 2 nd to 4 th pass deformation is 40%, the 5 th and 6 th pass deformations are 8%, and the finish rolling temperature is 845 ℃, and rolling the plate blank into a 6 mm-thick sheet; then the steel sheet obtained after finish rolling rapidly passes through a cooling line with water flow spraying at the upper part and the lower part, the steel sheet is cooled to 575 ℃ at the cooling speed of 12 ℃/S, and then is continuously cooled to 534 ℃ at the cooling speed of 6.8 ℃/S; and finally, curling the cooled sheet at 526 ℃, bundling the sheet and cooling the sheet to room temperature to obtain the steel coil.
Example 4
Adding a mixture containing chemical elements C: 0.030; si: 0.17; mn: 1.55; s: 0.001; ni: 0.05; p: 0.011; cr: 0.21; mo: 0.16; cu: 0.06; al: 0.016; nb: 0.056; v: 0.035; ti: 0.021%; n: 70 ppm. Heating the steel with the balance of Fe and impurities to 1150 ℃, keeping the temperature in the furnace for 120min, and discharging at 1136 ℃; rolling the material through rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling processes, wherein the rough rolling temperature is 1113 ℃, 7 passes of rolling are performed, the deformation of the 1 st pass is 25%, the deformation of the 2 nd to 7 th passes are 35%, a plate blank with the thickness of 250mm is rolled into a thin plate with the thickness of 34.8mm, and then a hot rolling process is performed through a hot rolling box, and the hot rolling temperature is 1021 ℃; carrying out finish rolling on the hot-rolled plate blank by a finish rolling machine, wherein the finish rolling starting temperature is 863 ℃, the deformation of the 1 st pass is 25%, the deformation of the 2 nd to 4 th passes is 35%, the deformation of the 5 th and 6 th passes is 6%, and the finish rolling temperature is 833 ℃, and rolling the plate blank into a 7 mm-thick sheet; then the steel sheet obtained after finish rolling rapidly passes through a cooling line with water flow spraying at the upper part and the lower part, the steel sheet is cooled to 556 ℃ at the cooling speed of 12.5 ℃/S, and then the steel sheet is continuously cooled to 523 ℃ at the cooling speed of 5.5 ℃/S; and finally, curling the cooled thin plate, wherein the curling temperature is 516 ℃, bundling the thin plate, and cooling to room temperature to obtain the steel coil.
The steel coils obtained in examples 1 to 4 had fine and uniform acicular ferrite structure. The austenite grain size is 13-13.5 grade, the tensile strength is more than 630MPa, the yield strength is more than 540MPa, the yield ratio is more than 0.85, the elongation is more than 35%, and the austenite grain size has good structure uniformity and high mechanical property.
The invention is suitable for a hot rolling 1780 production line, and particularly makes the hot rolling production line with 6 finish rolling mills more suitable for rolling the petroleum and natural gas conveying pipeline with high grain size, high strength and high toughness. The method has simple process adjustment, does not need additional investment, and has good popularization.

Claims (1)

1. A manufacturing method of a microalloy steel coil for an oil and gas transmission pipeline comprises the following steps: heating, rough rolling, dephosphorization, hot rolling, finish rolling, laminar cooling and curling, and is characterized in that a continuous casting plate blank is rolled into a steel coil with the thickness of 4-7 mm; the heating temperature of the continuous casting plate blank is 1150-1200 ℃, the rough rolling temperature is 1100-1150 ℃, the total deformation amount of rough rolling is 70-80%, the hot rolling temperature is 1080-1130 ℃, the finish rolling temperature is 850-900 ℃, the total deformation amount of finish rolling is 60-80%, the finish rolling temperature is 830-850 ℃, and the curling temperature is 500-550 ℃; the steel comprises the following chemical elements in percentage by mass: c: 0.035 to 0.045; si: 0.15 to 0.25; mn: 1.55-1.65; s: less than or equal to 0.003; ni: 0.05 to 0.10; p: 0.010-0.015; cr: 0.20 to 0.25; mo: 0.15 to 0.25; cu: 0.05 to 0.10; al: 0.015 to 0.040; nb: 0.055 to 0.075; v: 0.035 to 0.045%; ti: 0.020-0.025%; n: 70-100 ppm, wherein the N element is remained after steel making, no extra addition is needed, and the balance is Fe and impurities.
CN202210571570.0A 2022-05-25 2022-05-25 Manufacturing method of microalloy steel coil for petroleum and natural gas conveying pipeline Pending CN114774659A (en)

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