CN121132209A - A seamless niobium-vanadium-titanium microalloyed steel pipe and its preparation method - Google Patents
A seamless niobium-vanadium-titanium microalloyed steel pipe and its preparation methodInfo
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Abstract
本发明公开了一种铌钒钛微合金无缝钢管及其制备方法，属于无缝钢管技术领域，其包括以下步骤：S1.将铌钒钛微合金在加热、穿孔、轧管、定径后得到管坯；S2.对管坯进行退火和热处理后，得到热处理钢管；S3.在热处理钢管表面喷涂涂料，即可得到铌钒钛微合金无缝钢管。本发明的铌钒钛微合金无缝钢管具备优良的力学性能，能满足高强度的使用环境；铌钒钛微合金无缝钢管表面耐侵蚀，适用于高强度高腐蚀环境。This invention discloses a niobium-vanadium-titanium microalloyed seamless steel pipe and its preparation method, belonging to the technical field of seamless steel pipes. The method includes the following steps: S1. Heating, piercing, rolling, and sizing the niobium-vanadium-titanium microalloyed steel pipe to obtain a billet; S2. Annealing and heat-treating the billet to obtain a heat-treated steel pipe; S3. Spraying a coating onto the surface of the heat-treated steel pipe to obtain the niobium-vanadium-titanium microalloyed seamless steel pipe. The niobium-vanadium-titanium microalloyed seamless steel pipe of this invention possesses excellent mechanical properties, meeting the requirements of high-strength operating environments; the surface of the niobium-vanadium-titanium microalloyed seamless steel pipe is corrosion-resistant, making it suitable for high-strength, highly corrosive environments.
Description
Technical Field
The invention belongs to the technical field of seamless steel pipes, and particularly relates to a niobium-vanadium-titanium microalloy seamless steel pipe and a preparation method thereof.
Background
In the industrial field, the seamless steel pipe is widely applied to industries such as petroleum, chemical industry, electric power, mechanical manufacturing and the like as an important structure and conveying material. With the continuous development of industrial technology, the performance requirements on the seamless steel pipe are increasingly improved, and the seamless steel pipe is required to have higher strength, toughness and corrosion resistance, good fatigue performance, good dimensional accuracy and the like.
Currently, there are some disadvantages to the production of seamless steel pipes on the market. In terms of heat treatment process, some traditional heat treatment methods have difficulty in achieving good matching of strength and toughness, resulting in limited service performance of the steel pipe under certain complex working conditions. In the aspect of coating protection, the traditional single coating is difficult to meet the requirements of high adhesive force, high wear resistance and high corrosion resistance, the service life of the coating is short, frequent maintenance and replacement are required, and the use cost is increased.
Disclosure of Invention
The invention aims to overcome the technical problems, and provides a niobium-vanadium-titanium microalloy seamless steel tube and a preparation method thereof. The niobium-vanadium-titanium micro-alloy seamless steel pipe prepared by the method has excellent mechanical properties, can meet the use environment of high strength, has corrosion resistance on the surface, and is suitable for the environment of high strength and high corrosion.
The invention solves the technical problems through the following technical proposal.
The invention provides a preparation method of a niobium-vanadium-titanium microalloy seamless steel tube, which comprises the following steps:
the invention discloses a preparation method of a niobium-vanadium-titanium microalloy seamless steel tube, which comprises the following steps:
S1, heating, perforating, pipe rolling and sizing the niobium-vanadium-titanium microalloy to obtain a pipe blank;
s2, annealing and heat treatment are carried out on the pipe blank to obtain a heat-treated steel pipe;
and S3, spraying a coating on the surface of the heat-treated steel pipe to obtain the niobium-vanadium-titanium microalloy seamless steel pipe.
According to some embodiments of the invention, the niobium vanadium titanium microalloy comprises the following chemical composition ：C：0.12-0.18%、Si：0.20-0.40%、Mn：1.20-1.50%、P≤0.015%、S≤0.002%、Nb：0.02-0.06%、V：0.04-0.08%、Ti：0.01-0.03%,, balance Fe and unavoidable impurities in mass fraction.
According to some embodiments of the invention, the heating is performed at 1200-1300 ℃ for 60-90 min, preferably at 1220-1280 ℃ for 70-80 min.
According to some embodiments of the invention, the oxygen content in the heating furnace is 0.3-0.5vol%, preferably 0.35-0.45vol%, when the steel is heated, trace oxygen can inhibit excessive carburization or decarburization, and in addition, the trace oxygen reacts with iron and alloy elements on the surface of the steel pipe to form an extremely thin oxide film, so that further oxidation of internal metal can be prevented.
According to some embodiments of the present invention, the temperature of the piercing plug is 800-900 ℃, preferably 830-870 ℃.
According to some embodiments of the invention, the speed of the perforation is 1-2 m/s, preferably 1.4-1.8 m/s.
According to some embodiments of the invention, the deformation of the rolled tube per pass is 10-20%, and the total deformation of the rolled tube is controlled to be 30-50%.
According to some embodiments of the invention, the surface roughness of the rolled tube is more than or equal to 0.8 μm, preferably 1.2-2 μm.
According to some embodiments of the invention, the sizing temperature is 850-950 ℃, preferably 880-920 ℃.
According to some embodiments of the invention, the annealing is carried out by cooling to 650-700 ℃ for 90-120 min, cooling to 300-350 ℃ along with the furnace, preferably, the annealing is carried out by cooling to 680-700 ℃ for 100-120 min, and cooling to 300-320 ℃ along with the furnace. The annealing temperature can enable grains in the steel to be recrystallized, broken grains can be re-nucleated and grown, so that work hardening and internal stress generated by the previous processing (such as pipe rolling and sizing) are eliminated, and the steel can be cooled along with a furnace to avoid generating new internal stress due to rapid cooling, and meanwhile, certain alloy elements are prevented from being separated out to form harmful phases, so that the subsequent heat treatment effect is influenced.
According to some embodiments of the invention, the furnace atmosphere during annealing is nitrogen.
According to some embodiments of the invention, the heat treatment is performed by quenching-dispensing.
According to some embodiments of the invention, the heat treatment is followed by a straightening process.
According to some embodiments of the invention, the quenching is performed by heating to 750-800 ℃ and then preserving heat for 30-60 min, then quenching by adopting a water mist cooling mode, wherein the pressure of the water mist is 0.3-0.5 MPa, the temperature range is higher than the austenitizing temperature of the steel, the steel can be completely converted into a uniform austenitic structure, and for the steel containing microalloy elements such as niobium, vanadium and titanium, the temperature can ensure that microalloy carbonitride is fully dissolved into austenite, the alloying degree of the austenite is improved, and preparation is made for forming martensite by subsequent cooling.
According to some embodiments of the invention, the distribution is heated to 180-220 ℃ at a temperature rising speed of 5-10 ℃ per minute for 60-90 min, preferably, the distribution is heated to 200-220 ℃ at a temperature rising speed of 8-10 ℃ per minute for 70-80 min, and the temperature range is favorable for diffusion of carbon from martensite to retained austenite and improves the stability of the retained austenite. Meanwhile, part of martensite can be decomposed into tempered martensite, so that the toughness of the steel is improved.
According to some embodiments of the invention, the atmosphere in the preparation is a mixed gas of 5-10vol% of H 2 and the balance of N 2, preferably the atmosphere in the preparation is a mixed gas of 6-9vol% of H 2 and the balance of N 2, and the reducing property of hydrogen eliminates surface oxidation interference and nitrogen prevents new oxidation. When carbon diffuses from martensite to residual austenite at high temperature, the diffusion is more complete, the stability of the residual austenite is obviously improved, and meanwhile, the atmosphere of the mixed gas is stable, thereby avoiding the interference of harmful gas on the tissue transformation.
According to some embodiments of the invention, the air is cooled to room temperature after the partitioning treatment.
According to some embodiments of the invention, the coating is divided into a primer coating and a top coating;
according to some embodiments of the invention, the primer is nichrome powder and the topcoat is fluorocarbon paint.
According to some embodiments of the invention, the chemical components of the nichrome powder are, by mass fraction, 14-19% Cr, 2.5-4.5% B, 3.3-5.0% Si, 4.5-8.0% Fe, 0.3-1.0% C and the balance Ni;
According to some embodiments of the invention, the primer is flame sprayed.
According to some embodiments of the invention, the top coating is spray coated.
The invention also discloses a niobium-vanadium-titanium microalloy seamless steel tube prepared by the preparation method.
According to some embodiments of the invention, the yield strength of the niobium-vanadium-titanium microalloyed seamless steel tube is 550-600 MPa.
According to some embodiments of the invention, the tensile strength of the niobium-vanadium-titanium micro-alloy seamless steel tube is 600-700 MPa.
According to some embodiments of the invention, the elongation of the niobium-vanadium-titanium microalloyed seamless steel tube is greater than or equal to 22%.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
Compared with the prior art, the invention has the beneficial effects that:
1. The preparation process of the invention precisely controls key parameters of heating, annealing and heat treatment processes, and ensures uniform structure and stable performance of the steel pipe. The oxygen content is controlled in the heating process, so that the stable heating temperature can be maintained, the surface damage caused by excessive oxidation is avoided, excessive carburization or decarburization is inhibited, and a good foundation is laid for subsequent processing. The annealing process eliminates the internal stress generated in the working procedures of tube rolling and the like by utilizing the recrystallization principle, so that the crystal grains are refined uniformly, and the preparation of the structure is prepared for quenching treatment. In the quenching-partitioning heat treatment process, proper quenching temperature ensures complete austenitization of the steel, and under the partitioning temperature mixed gas atmosphere, diffusion of carbon from martensite to residual austenite is promoted, so that the stability of the residual austenite is greatly improved, and the balance between strength and toughness is realized.
2. In terms of mechanical properties, the yield strength of the niobium-vanadium-titanium micro-alloy seamless steel pipe prepared by the method is 550-600 MPa, in some preferred embodiments, 555-585 MPa, the tensile strength of the niobium-vanadium-titanium micro-alloy seamless steel pipe is 600-700 MPa, in some preferred embodiments, 630-670 MPa, and the elongation of the niobium-vanadium-titanium micro-alloy seamless steel pipe is more than or equal to 21%, in some preferred embodiments, more than or equal to 22%.
3. The niobium-vanadium-titanium microalloy seamless steel pipe has good corrosion resistance and wear resistance on the surface performance, and can be widely applied to the fields with strong corrosiveness such as petroleum, chemical industry and the like.
Detailed Description
The present invention will be described more fully hereinafter with reference to the preferred embodiments for the purpose of facilitating understanding of the present invention, but the scope of the present invention is not limited to the following specific embodiments.
Unless defined otherwise, all technical and scientific terms used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the scope of the present invention.
The "range" disclosed herein is defined in terms of lower and upper limits, with the given range being defined by the selection of a lower and an upper limit, the selected lower and upper limits defining the boundaries of the particular range. Ranges may be defined in this way as either inclusive or exclusive of the endpoints, and any combination may be made, i.e., any lower limit may be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a particular parameter, it is understood that ranges of 60-110 and 80-120 are also contemplated. Furthermore, if minimum range values 1 and 2 are listed, and if maximum range values 3,4, and 5 are listed, then the following ranges are all contemplated as 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In the present invention, unless otherwise indicated, the numerical range "a-b" represents a shorthand representation of any combination of real numbers between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" have been listed throughout, and "0-5" is simply a shorthand representation of a combination of these values. When a certain parameter is expressed as an integer of 2 or more, it is disclosed that the parameter is, for example, an integer of 2,3, 4,5, 6,7, 8, 9, 10,11, 12 or the like.
All embodiments of the invention and alternative embodiments may be combined with each other to form new solutions, unless otherwise specified.
All technical features and optional technical features of the invention may be combined with each other to form new technical solutions, unless specified otherwise.
All the steps of the present invention may be performed sequentially or randomly, preferably sequentially, unless otherwise specified. For example, the method comprises steps (a) and (b), meaning that the method may comprise steps (a) and (b) performed sequentially, or may comprise steps (b) and (a) performed sequentially. For example, the method may further comprise step (c), meaning that step (c) may be added to the method in any order, e.g., the method may comprise steps (a), (b) and (c), may also comprise steps (a), (c) and (b), may also comprise steps (c), (a) and (b), etc.
The terms "comprising" and "including" as used herein mean open ended or closed ended, unless otherwise noted. For example, the terms "comprising" and "comprises" may mean that other components not listed may be included or included, or that only listed components may be included or included.
The term "or" is inclusive in this invention, unless otherwise specified. For example, the phrase "a or B" means "a, B, or both a and B. More specifically, either condition satisfies the condition "A or B" that A is true (or present) and B is false (or absent), that A is false (or absent) and B is true (or present), or that both A and B are true (or present).
The raw material information used in the following examples is as follows:
the nickel-chromium alloy powder comprises, by mass, 17.5% of Ni, 3.7% of B, 3.3% of Si, 4.6% of Fe, 0.82% of C, and the balance of Ni and unavoidable impurities;
Fluorocarbon paint is purchased from Zoge coating FC1200 fluorocarbon metallic paint, and the fluorine content is 22%;
Including but not limited to the manufacturer models above.
Example 1
The preparation method of the niobium-vanadium-titanium microalloy seamless steel tube in the embodiment comprises the following steps:
S1, preparing raw materials, namely preparing niobium-vanadium-titanium microalloy steel with chemical components of 0.134% of C, 0.25% of Si, 1.42% of Mn, 0.011% of P, 0.002% of S, 0.045% of Nb, 0.061% of V, 0.018% of Ti and the balance of Fe and unavoidable impurities.
Heating, namely putting the niobium-vanadium-titanium microalloy steel into a heating furnace, heating to 1200 ℃ in an atmosphere with the oxygen content of 0.4vol%, and preserving heat at the temperature for 65min;
Perforating, namely perforating the heated steel, controlling the temperature of a plug to 850 ℃ and the perforation speed to be 1.3m/s to obtain a capillary;
Tube rolling, namely rolling the blank tube by adopting a tube rolling machine, wherein the deformation of each pass is controlled to be 12-14%, the total deformation is controlled to be 37%, and the surface roughness of the rolled steel tube reaches 1.5 mu m;
Sizing, namely sizing the rolled steel pipe, wherein the sizing temperature is controlled to 900 ℃ to obtain a pipe blank.
S2, annealing, namely putting the sized tube blank into an annealing furnace, introducing high-purity nitrogen (the purity is more than or equal to 99.9%) into the furnace as a protective atmosphere, cooling the tube blank to 680 ℃, preserving the heat at the temperature for 100min, and then cooling to 320 ℃ along with the furnace;
Quenching, namely taking out the annealed tube blank, heating to 800 ℃, preserving heat for 50min, quenching by adopting a water mist cooling mode, controlling the water mist pressure to be 0.40MPa, and cooling to 160 ℃;
and (3) the components are arranged in a furnace, 8.5vol% of mixed gas of H 2 and the balance N 2 is introduced as protective atmosphere, the steel pipe is heated to 200 ℃ at a temperature rising speed of 8 ℃ per minute, the temperature is kept for 70 minutes, and then the steel pipe is cooled to room temperature in an air cooling way, so that the heat treatment is completed, and the heat-treated steel pipe is obtained.
Straightening, namely straightening the heat-treated steel pipe by adopting a multi-roller straightener, wherein the straightening pressure is controlled to be 6-9 MPa, so that the straightness error of the steel pipe is less than or equal to 1mm/m.
S3, spraying a primer, namely spraying nickel-chromium alloy powder on the surface of the straightened steel pipe in an arc spraying mode (1050 ℃) to form a primer coating.
And (3) spraying the surface coating, namely coating fluorocarbon paint on the surface of the bottom coating in a spraying mode after the bottom coating is dried to form the surface coating, and thus obtaining the niobium-vanadium-titanium microalloy seamless steel tube.
Example 2
The difference between this embodiment and embodiment 1 is that:
S1, heating, namely putting the niobium-vanadium-titanium microalloy steel into a heating furnace, heating to 1250 ℃ in an atmosphere with the oxygen content of 0.45vol%, and preserving heat at the temperature for 75 minutes;
Other steps and parameters were the same as in example 1.
Example 3
The difference between this embodiment and embodiment 2 is that:
in S1, the temperature of a perforation control plug is 900 ℃, and the perforation speed is 1.8m/S;
Other steps and parameters were the same as in example 1.
Example 4
The difference between this embodiment and embodiment 1 is that:
in the S1 heating process, heating to 1230 ℃ in an atmosphere with the oxygen content of 0.3vol%, and preserving the temperature for 70min;
rolling the pipe, namely controlling the deformation of each pass to be 14-15%, controlling the total deformation to be 40%, and enabling the surface roughness of the steel pipe to reach 1.2 mu m after pipe rolling;
sizing temperature is 850 ℃;
Other materials, steps and parameters were the same as in example 1.
Example 5
The difference between this embodiment and embodiment 1 is that:
in the S2 annealing process, the tube blank is cooled to 610 ℃, and is kept at the temperature for 100 minutes, and then is cooled to 300 ℃ along with the furnace;
Other steps and parameters were the same as in example 1.
Example 6
The difference between this embodiment and embodiment 1 is that:
S2, in the quenching process, taking out the annealed tube blank, heating to 750 ℃ and preserving heat for 60min;
The method comprises the steps of (1) putting a quenched steel pipe into a furnace, introducing mixed gas of 7.2% H 2 and the balance N 2 as atmosphere, heating to 220 ℃ at a temperature rising speed of 5 ℃ per min, preserving heat for 60min at the temperature, and then cooling to room temperature by air to finish heat treatment to obtain a heat-treated steel pipe;
Other steps and parameters were the same as in example 1.
Comparative example 1
The difference between this comparative example and example 1 is that:
The heat treatment of this comparative example does not contain a quenching process, i.e., the formulation treatment is directly performed after annealing;
Other materials, steps and parameters were the same as in example 1.
Comparative example 2
The difference between this comparative example and example 1 is that:
the heat treatment of this comparative example does not include a partitioning process, i.e., only a quenching treatment is performed after annealing;
Other materials, steps and parameters were the same as in example 1.
Comparative example 3
The difference between this comparative example and example 2 is that:
the surface of the niobium-vanadium-titanium microalloy seamless steel pipe of the comparative example is not sprayed with paint, namely the step S3 is not included;
Other steps and parameters were the same as in example 1.
Test example 1 mechanical Property test
Mechanical property tests are carried out on the niobium-vanadium-titanium microalloy seamless steel pipes prepared in the examples and the comparative examples, and the test results are shown in table 1;
test example 2 coating Performance test
The seamless steel tubes of niobium-vanadium-titanium microalloy prepared in example 2 and comparative example 3 were subjected to corrosion resistance and abrasion resistance tests, and the test results are shown in table 2;
dissolving sodium chloride in distilled water to prepare a solution with the concentration of 50+/-5 g/L, the pH value of 6.7-7.0, the test temperature of 35+/-2 ℃ and the test time of 800 hours;
the abrasion resistance test is referred to GB/T1768-2006, the load is 500g, the revolution is 1000 revolutions, and the abrasion stroke is 4.7+/-0.1 mm per revolution.
Unless otherwise specifically indicated, the various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or may be prepared by existing methods. While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (10)
1. The preparation method of the niobium-vanadium-titanium microalloy seamless steel tube is characterized by comprising the following steps of:
S1, heating, perforating, pipe rolling and sizing the niobium-vanadium-titanium microalloy to obtain a pipe blank;
s2, annealing and heat treatment are carried out on the pipe blank to obtain a heat-treated steel pipe;
and S3, spraying a coating on the surface of the heat-treated steel pipe to obtain the niobium-vanadium-titanium microalloy seamless steel pipe.
2. The method for producing a seamless steel pipe of niobium-vanadium-titanium microalloy according to claim 1, wherein the niobium-vanadium-titanium microalloy comprises the following chemical components ：C：0.12-0.18%、Si：0.20-0.40%、Mn：1.20-1.50%、P≤0.015%、S≤0.002%、Nb：0.02-0.06%、V：0.04-0.08%、Ti：0.01-0.03%, in mass fraction, the balance being Fe and unavoidable impurities.
3. The method for preparing the niobium-vanadium-titanium microalloyed seamless steel tube according to claim 1, wherein the heating is performed at 1200-1300 ℃ for 60-90 min, preferably at 1220-1280 ℃ for 70-80 min;
And/or the oxygen content in the heating furnace is 0.3-0.5vol%, preferably 0.35-0.45vol% during heating;
and/or the temperature of the top of the perforation is 800-900 ℃, preferably 830-870 ℃;
and/or the speed of the perforation is 1-2 m/s, preferably 1.4-1.8 m/s.
4. The method for preparing the niobium-vanadium-titanium microalloyed seamless steel tube according to claim 1, wherein the deformation of each pass of the rolled tube is 10-20%, and the total deformation of the rolled tube is controlled to be 30-50%;
And/or the roughness of the surface of the rolled tube is more than or equal to 0.8 mu m, preferably 1.2-2 mu m;
and/or the sizing temperature is 850-950 ℃, preferably 880-920 ℃.
5. The method for preparing the niobium-vanadium-titanium microalloyed seamless steel tube according to claim 1, wherein the annealing is carried out by cooling to 650-700 ℃ for 90-120 min, then cooling to 300-350 ℃ along with a furnace, preferably the annealing is carried out by cooling to 680-700 ℃ for 100-120 min, and then cooling to 300-320 ℃ along with a furnace;
and/or the furnace atmosphere during annealing is nitrogen;
and/or the heat treatment mode is a quenching-partitioning mode;
And/or, the heat treatment further comprises a straightening process.
6. The method for preparing the niobium-vanadium-titanium microalloy seamless steel tube according to claim 5, wherein the quenching is performed by heating to 750-800 ℃, preserving heat for 30-60 min, and then quenching by adopting a water mist cooling mode, wherein the pressure of the water mist is 0.3-0.5 MPa;
And/or heating the components to 180-220 ℃ at a heating rate of 5-10 ℃ per minute for 60-90 minutes, and preferably heating the components to 200-220 ℃ at a heating rate of 8-10 ℃ per minute for 70-80 minutes;
And/or the atmosphere in the process of the preparation is a mixed gas of 5-10vol% of H 2 and the balance N 2, preferably the atmosphere in the process of the preparation is a mixed gas of 5-8vol% of H 2 and the balance N 2;
And/or, air cooling to room temperature after the preparation treatment.
7. The method for producing a seamless steel pipe of niobium-vanadium-titanium microalloy according to claim 6, wherein the paint is divided into a primer paint and a top paint;
wherein the primer is nickel-chromium alloy powder, and the surface layer coating is fluorocarbon paint.
8. The method for preparing the niobium-vanadium-titanium microalloy seamless steel tube according to claim 7, wherein the chemical components of the nichrome powder are, by mass, 14-19% of Cr, 2.5-4.5% of B, 3.3-5.0% of Si, 4.5-8.0% of Fe, 0.3-1.0% of C and the balance of Ni.
9. A seamless steel tube of niobium-vanadium-titanium microalloy, characterized in that it is produced by the method for producing a seamless steel tube of niobium-vanadium-titanium microalloy as claimed in any one of claims 1 to 6.
10. The niobium-vanadium-titanium microalloyed seamless steel tube of claim 9, wherein the yield strength of the niobium-vanadium-titanium microalloyed seamless steel tube is 550-600 mpa;
And/or the tensile strength of the niobium-vanadium-titanium microalloy seamless steel tube is 600-700 MPa;
And/or the elongation percentage of the niobium-vanadium-titanium microalloy seamless steel tube is more than or equal to 22 percent.
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