CN113106346A - High-strength seamless line pipe and preparation method thereof - Google Patents
High-strength seamless line pipe and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of seamless pipeline pipe manufacturing, and particularly discloses a high-strength seamless pipeline pipe and a preparation method thereof, wherein the seamless pipeline pipe comprises the following components in percentage by weight: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.15 percent and less than or equal to 0.35 percent, Mn is more than or equal to 1.75 percent and less than or equal to 1.55 percent, Cr is more than or equal to 0.35 percent and less than or equal to 0.55 percent, Mo is more than or equal to 0.15 percent and less than or equal to 0.25 percent, Ti is more than or equal to 0.01 percent and less than or equal to 0.03 percent, Mg is more than or equal to.01 percent, P is less than or equal to 0.01 percent, the balance is Fe and inevitable impurities, and the carbon equivalent is CEPcmLess than or equal to 0.25 percent. The seamless pipeline pipe provided by the invention has the advantages of simple component system, low manufacturing cost, excellent strength, toughness and corrosion resistance, can be widely used for oil and gas transmission in ultra-deep sea areas, and has wide market prospect.
Description
Technical Field
The invention relates to the technical field of seamless pipeline pipe manufacturing, in particular to a high-strength seamless pipeline pipe and a preparation method thereof.
Background
According to the prediction of international authorities, the worldwide oil demand is increased to 1.6% in 2030 years from 2000, and reaches 57.69 hundred million tons in 2030 years; the demand for natural gas has increased by 2.4% every year and by 2030 it will reach 42.03 million tonne oil equivalent. With the rapid increase in demand for oil and gas, the demand for line pipe for oil and gas transmission line construction will also increase. However, the exploration and production of oil and gas in deep sea areas must be increased by relying only on the development of ordinary oil and gas wells that have not met the rapidly increasing demand for oil and gas. Therefore, China urgently needs to develop a high-end oil and gas conveying pipeline pipe which can be suitable for oil and gas exploitation in deep sea areas in the future.
The line pipe comprises seamless line pipe and welded line pipe. Compared with a welded pipeline pipe, the seamless pipeline pipe has the advantages of higher safety level requirement, relatively special use condition, lower product radial-wall ratio numerical value and the like due to good continuous consistency of pipe body structure and performance distribution, high use reliability and the like. Generally, seamless pipeline pipes are applied to oil and gas gathering pipelines, submarine oil pipelines and town oil and gas pipe networks, the pipe diameter range is mainly medium and small diameter, and the diameter is mainly distributed in 114.3-273.1 mm. The steel grade of the existing seamless pipeline pipe is mainly concentrated on X70 or below, and the requirement of high-pressure oil gas transmission cannot be met. At present, the improvement of the performance of the seamless pipe line pipe is mainly realized by adding more alloy elements and improving a heat treatment process; however, a seamless pipe line is required to have good welding properties, and an increase in alloying elements will result in a weld crack index CEPcmThe method is increased, and an effective online structure performance regulation and control means is lacked in the current seamless pipeline rolling process.
Disclosure of Invention
Aiming at the problems that the existing high-strength seamless line pipe is high in alloy element content and an effective online structure performance regulation and control means is lacked in the rolling process, the invention provides a high-strength seamless line pipe and a preparation method thereof.
In order to solve the technical problem, the embodiment of the invention provides the following technical scheme:
a high-strength seamless line pipe comprises the following components in percentage by weight: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.15 percent and less than or equal to 0.35 percent, Mn is more than or equal to 1.55 percent and less than or equal to 1.75 percentCr is more than or equal to 0.35 percent and less than or equal to 0.55 percent, Mo is more than or equal to 0.15 percent and less than or equal to 0.25 percent, Ti is more than or equal to 0.01 percent and less than or equal to 0.03 percent, Mg is more than or equal to 0.001 percent and less than or equal to 0.002 percent, S is less than or equal to 0.01 percent, P is less than or equal to 0.01 percent, the balance is Fe and inevitable impurities, and carbon equivalentPcm≤0.25％。
Compared with the prior art, the high-strength seamless line pipe provided by the invention has the advantages that the alloy component system is simple, noble alloy elements such as V, Nb, Cu and Ni are not additionally added, the C content is controlled to be 0.06-0.1%, the welding performance of the steel pipe is favorably improved, and meanwhile, the Cr element can be prevented from forming coarse carbides in the heat treatment process of the steel pipe; by controlling the Mn content to be 1.55-1.75%, the strength reduction caused by lower carbon content can be compensated, and the low-temperature impact toughness of the steel pipe can be improved; cr and Mo are added to perform solid solution strengthening on ferrite, and simultaneously, the Cr and Mo can also effectively improve the stability of carbide, so that the strength of the line pipe is obviously improved; and Ti and Mg are added for microalloying, so that the form of inclusions is controlled, grains are refined, the structure is uniform, and the toughness of the pipeline pipe can be improved. The components of the invention are mutually matched and cooperated, so that the prepared seamless pipeline pipe has excellent comprehensive performance and stable mechanical property, simultaneously, the cost of the alloy is obviously reduced, the performance requirement of oil and gas transmission in ultra-deep sea water areas is completely met, and the invention has wide application prospect.
Preferably, the microstructure of the high-strength seamless line pipe is ferrite and tempered bainite.
The invention also provides a preparation method of the high-strength seamless line pipe, which comprises the following steps:
heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary to obtain a pierced billet, and reducing the diameter of the pierced billet by micro-tension to obtain a rolled pipeline; quenching and tempering the rolled pipeline pipe to obtain a high-strength seamless pipeline pipe; and the chemical composition of the continuous casting round billet is the same as that of the high-strength seamless pipeline pipe.
Preferably, the continuous casting round billet is prepared by using scrap steel as a raw material through the working procedures of electric arc furnace smelting, ladle refining and continuous casting.
Preferably, in the ladle refining process, FeTi alloy is added when the content of dissolved oxygen in molten steel is 10-30 ppm, and then MgSi wire is fed for deoxidation alloying.
Preferably, in the ladle refining process, the addition amount of the FeTi alloy is 0.8-1.2 kg/t, and the addition amount of the MgSi wire is 3-4 m/t.
The weight of the core powder in the MgSi wire is 260g/m, the Mg content is 18 wt%, and the Si content is 55 wt%.
Preferably, in the ladle refining process, the weight percentages of the components of the ladle refining slag are controlled in the following ranges: 55-65% of CaO and SiO2 17～22％、Al2O3 10～15％、CaF2 3～7％、Na2O0.5～2％、FeO 1～3％。
The optimized ladle refining slag is beneficial to controlling the dissolved oxygen content of molten steel in the ladle refining process, FeTi alloy is added when 10-30 ppm is selected, then MgSi wires are fed, the formation of fine Ti-Mg composite oxides in the molten steel is facilitated, and the fine Ti-Mg composite oxides can be used as cores of grain nucleation in the subsequent rolling and heat treatment processes, so that the refinement of steel pipe tissues is promoted, and the improvement of the strength and the toughness of materials is facilitated. And fine nucleation particles in the steel structure are increased by adding Mg and Ti, so that the structure performance of the steel pipe in the rolling process is effectively regulated and controlled, and the toughness and the strength of the steel pipe are improved.
Preferably, in the micro-tension reducing procedure, the temperature of the pierced billet entering the micro-tension reducing procedure is 850-870 ℃, and the reducing rate is 20-40%.
The optimized micro-tension reducing temperature and reducing rate can improve the nucleation rate during phase change, inhibit the aggregation and growth of precipitated phases, facilitate the refinement of crystal grains and the improvement of tissues, and can effectively regulate and control the steel structure performance in the rolling process by matching with a method of adding Mg and Ti at the time of specific oxygen content, thereby obviously improving the strength and the toughness of the material.
Preferably, in the tempering step, the rolled pipeline is heated to 900-950 ℃ and kept warm for 5-8 min, then quenched by water cooling, then heated to 520-580 ℃ and kept warm for 10-15 min, and then cooled by air.
Heating the rolled pipeline pipe to 900-950 ℃ and preserving heat for 5-8 min, which is beneficial to fully dissolving and homogenizing the carbides of Mo and Cr in the steel pipe, tempering at a low temperature of 520-580 ℃ after water-cooling quenching and preserving heat for 10-15 min, and is beneficial to separating out fine and uniformly dispersed carbides, thereby being beneficial to improving the toughness of the steel pipe.
Preferably, in the heating procedure of the annular furnace, the annular heating furnace is sequentially divided into a preheating section, a heating section and a soaking section according to the conveying direction of the continuous casting round billet, and the temperature of each section is controlled respectively; wherein the temperature of the preheating section is controlled to be 900-940 ℃, the temperature of the heating section is controlled to be 1240-1280 ℃, and the temperature of the soaking section is controlled to be 1240-1260 ℃; the discharging temperature of the continuous casting round billet is 1120-1140 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
The optimal setting of the heating temperature, the tapping temperature and the material distribution angle of the annular furnace is beneficial to controlling the continuous casting round billet to roll in an ideal deformation temperature range, and the surface quality, the dimensional accuracy and the performance of the finished steel pipe are improved.
The invention provides a high-strength seamless line pipe, which has a simple alloy component system, and the prepared seamless line pipe has a fine and uniform ferrite and tempered bainite structure, good mechanical property and corrosion resistance, excellent comprehensive performance and stable mechanical property through reasonable component design and a unique preparation process. The yield strength of the seamless line pipe is 729-807MPa, the tensile strength is 824-875MPa, and the yield ratio is less than or equal to 0.91; the elongation is 25-30%, the horizontal Charpy impact energy at 0 ℃ is 173-203J, and the method can be widely used for oil and gas conveying in ultra-deep sea areas and has a wide market prospect.
Drawings
FIG. 1 is a metallographic structure of a high-strength seamless line pipe prepared in example 1 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to better illustrate the invention, the following examples are given by way of further illustration.
Example 1
The embodiment of the invention provides a high-strength seamless line pipe, which comprises the following chemical components:
0.06% of C, 0.35% of Si, 1.75% of Mn, 0.03% of Ti, 0.25% of Mo, 0.48% of Cr, 0.001% of Mg0.003% of S, 0.008% of P, and the balance of Fe and inevitable impurities, CEPcm 0.20％。
The preparation steps of the high-strength seamless line pipe are as follows:
the method comprises the following steps of taking scrap steel as a raw material, and preparing a continuous casting round billet with the same chemical composition as the high-strength seamless pipeline pipe through 80t electric arc furnace smelting, ladle refining and continuous casting processes; heating the continuous casting round billet by using an annular furnace, perforating to prepare a capillary, rolling the capillary by using a five-rack PQF unit to obtain a pierced billet, and removing the pierced billet by using a three-rack pipe removing machine, reducing the diameter by using micro tension, cooling by using a stepping cooling bed to prepare a rolled steel pipe with the outer diameter of 114.3mm and the wall thickness of 11.13 mm; and (4) after quenching and tempering the rolled steel pipe, obtaining the high-strength seamless line pipe.
In the process of ladle refining, 0.8kg/t of FeTi alloy is added when the content of dissolved oxygen in molten steel is 10-30 ppm, and then 3.8m/t of MgSi wire is fed for deoxidation alloying. The main chemical components of the ladle refining slag are as follows: 55-65% of CaO and SiO2 17～22％、Al2O3 10～15％、CaF2 3～7％、Na2O 0.5～2％、FeO 1～3％。
In the continuous casting process, the whole-process protective casting is adopted, and the secondary oxidation of the molten steel is controlled.
A circular heating furnace procedure, wherein the circular heating furnace is divided into a preheating section, a heating section and a soaking section in sequence according to the conveying direction of the continuous casting round billet, and the temperature of each section is controlled respectively; wherein the temperature of the preheating section is controlled to be 940 ℃, the temperature of the heating section is controlled to be 1260 ℃, and the temperature of the soaking section is controlled to be 1260 ℃; the tapping temperature of the continuous casting round billet is 1130 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
In the perforation process, a novel conical two-roller perforator with a rolling angle of 15 degrees is adopted, the feeding angle is 15 degrees, the temperature before perforation of the continuous casting round billet is 1055 degrees, the temperature after perforation is 1140 degrees, the outer diameter of the capillary tube obtained after perforation is 202-212mm, and the wall thickness is 16.3-17.3 mm.
In the rolling process of the five-stand PQF unit, the temperature of the hollow billet before hot rolling is 1045 ℃, the outer diameter of the hollow billet obtained after rolling is 178-182mm, and the wall thickness is 10.6-11.1 mm. The external diameter of the pierced billet after the tube is taken off is 168-172mm, and the wall thickness is 10.8-11 mm.
In the micro-tension reducing process, the temperature of the pierced billet entering the micro-tension reducing process is 865 ℃, and the reducing rate is 30%.
In the hardening and tempering process, the rolled pipeline pipe is heated to 940 ℃, kept warm for 6min, quenched by water, then heated to 530 ℃, kept warm for 12min, and cooled to room temperature by air.
Example 2
The embodiment of the invention provides a high-strength seamless line pipe, which comprises the following chemical components:
0.08% of C, 0.25% of Si, 1.55% of Mn, 0.02% of Ti, 0.15% of Mo, 0.55% of Cr, 0.0012% of Mg0.005% of S, 0.009% of P, and the balance of Fe and inevitable impurities, CEPcm0.20％。
The preparation steps of the high-strength seamless line pipe are as follows:
the method comprises the following steps of taking scrap steel as a raw material, and preparing a continuous casting round billet with the same chemical composition as the high-strength seamless pipeline pipe through 80t electric arc furnace smelting, ladle refining and continuous casting processes; heating the continuous casting round billet by using an annular furnace, perforating to prepare a capillary, rolling the capillary by using a five-rack PQF unit to obtain a pierced billet, and removing the pierced billet by using a three-rack pipe removing machine, reducing the diameter by using micro tension, cooling by using a stepping cooling bed to prepare a rolled steel pipe with the outer diameter of 114.3mm and the wall thickness of 11.13 mm; and (4) after quenching and tempering the rolled steel pipe, obtaining the high-strength seamless line pipe.
In the process of ladle refining, 1.2kg/t of FeTi alloy is added when the content of dissolved oxygen in molten steel is 10-30 ppm, and then 3.5m/t of MgSi wire is fed for deoxidation alloying. The main chemical components of the ladle refining slag are as follows: 55-65% of CaO and SiO2 17～22％、Al2O3 10～15％、CaF2 3～7％、Na2O 0.5～2％、FeO 1～3％。
In the continuous casting process, the whole-process protective casting is adopted, and the secondary oxidation of the molten steel is controlled.
A circular heating furnace procedure, wherein the circular heating furnace is divided into a preheating section, a heating section and a soaking section in sequence according to the conveying direction of the continuous casting round billet, and the temperature of each section is controlled respectively; wherein the temperature of the preheating section is controlled to be 920 ℃, the temperature of the heating section is controlled to be 1250 ℃, and the temperature of the soaking section is controlled to be 1240 ℃; the tapping temperature of the continuous casting round billet is 1120 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
In the perforation process, a novel conical two-roller perforator with a rolling angle of 15 degrees is adopted, the feeding angle is 15 degrees, the temperature before perforation of the continuous casting round billet is 1055 degrees, the temperature after perforation is 1140 degrees, the outer diameter of the capillary tube obtained after perforation is 202-212mm, and the wall thickness is 16.3-17.3 mm.
In the rolling process of the five-stand PQF unit, the temperature of the hollow billet before hot rolling is 1045 ℃, the outer diameter of the hollow billet obtained after rolling is 178-182mm, and the wall thickness is 10.6-11.1 mm. The external diameter of the pierced billet after the tube is taken off is 168-172mm, and the wall thickness is 10.8-11 mm.
In the micro-tension reducing process, the temperature of the pierced billet entering the micro-tension reducing process is 870 ℃, and the reducing rate is 20%.
In the hardening and tempering process, the rolled pipeline pipe is heated to 920 ℃, kept warm for 7min, quenched by water, then heated to 520 ℃, kept warm for 15min, and cooled to room temperature by air.
Example 3
The embodiment of the invention provides a high-strength seamless line pipe, which comprises the following chemical components:
0.09% of C, 0.30% of Si, 1.68% of Mn, 0.01% of Ti, 0.20% of Mo, 0.35% of Cr, 0.002% of Mg0.008% of S, 0.007% of P, the balance of Fe and inevitable impurities, CEPcm 0.22％。
The preparation steps of the high-strength seamless line pipe are as follows:
the method comprises the following steps of taking scrap steel as a raw material, and preparing a continuous casting round billet with the same chemical composition as the high-strength seamless pipeline pipe through 80t electric arc furnace smelting, ladle refining and continuous casting processes; heating the continuous casting round billet by using an annular furnace, perforating to prepare a capillary, rolling the capillary by using a five-rack PQF unit to obtain a pierced billet, and removing the pierced billet by using a three-rack pipe removing machine, reducing the diameter by using micro tension, cooling by using a stepping cooling bed to prepare a rolled steel pipe with the outer diameter of 114.3mm and the wall thickness of 11.13 mm; and (4) after quenching and tempering the rolled steel pipe, obtaining the high-strength seamless line pipe.
In the process of ladle refining, 0.9kg/t of FeTi alloy is added when the content of dissolved oxygen in molten steel is 10-30 ppm, and then a 3m/t MgSi wire is fed for deoxidation alloying. The main chemical components of the ladle refining slag are as follows: 55-65% of CaO and SiO2 17～22％、Al2O3 10～15％、CaF2 3～7％、Na2O 0.5～2％、FeO 1～3％。
In the continuous casting process, the whole-process protective casting is adopted, and the secondary oxidation of the molten steel is controlled.
A circular heating furnace procedure, wherein the circular heating furnace is divided into a preheating section, a heating section and a soaking section in sequence according to the conveying direction of the continuous casting round billet, and the temperature of each section is controlled respectively; wherein the temperature of the preheating section is controlled to be 900 ℃, the temperature of the heating section is controlled to be 1280 ℃, and the temperature of the soaking section is controlled to be 1250 ℃; the tapping temperature of the continuous casting round billet is 1140 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
In the perforation process, a novel conical two-roller perforator with a rolling angle of 15 degrees is adopted, the feeding angle is 15 degrees, the temperature before perforation of the continuous casting round billet is 1055 degrees, the temperature after perforation is 1140 degrees, the outer diameter of the capillary tube obtained after perforation is 202-212mm, and the wall thickness is 16.3-17.3 mm.
In the rolling process of the five-stand PQF unit, the temperature of the hollow billet before hot rolling is 1045 ℃, the outer diameter of the hollow billet obtained after rolling is 178-182mm, and the wall thickness is 10.6-11.1 mm. The external diameter of the pierced billet after the tube is taken off is 168-172mm, and the wall thickness is 10.8-11 mm.
In the micro-tension reducing process, the temperature of the pierced billet entering the micro-tension reducing process is 850 ℃, and the reducing rate is 40%.
In the hardening and tempering process, the rolled pipeline pipe is heated to 950 ℃ and is kept warm for 5min, then is quenched by water cooling, then is heated to 580 ℃ and is kept warm for 10min, and then is cooled to room temperature by air cooling.
Example 4
The embodiment of the invention provides a high-strength seamless line pipe, which comprises the following chemical components:
0.10% of C, 0.15% of Si, 1.67% of Mn, 0.024% of Ti, 0.22% of Mo, 0.44% of Cr, 0.0013% of Mg0.007% of S, 0.008% of P, and the balance of Fe and inevitable impurities, CEPcm0.23％。
The preparation steps of the high-strength seamless line pipe are as follows:
the method comprises the following steps of taking scrap steel as a raw material, and preparing a continuous casting round billet with the same chemical composition as the high-strength seamless pipeline pipe through 80t electric arc furnace smelting, ladle refining and continuous casting processes; heating the continuous casting round billet by using an annular furnace, perforating to prepare a capillary, rolling the capillary by using a five-rack PQF unit to obtain a pierced billet, and removing the pierced billet by using a three-rack pipe removing machine, reducing the diameter by using micro tension, cooling by using a stepping cooling bed to prepare a rolled steel pipe with the outer diameter of 114.3mm and the wall thickness of 11.13 mm; and (4) after quenching and tempering the rolled steel pipe, obtaining the high-strength seamless line pipe.
In the process of ladle refining, 1.0kg/t of FeTi alloy is added when the content of dissolved oxygen in molten steel is 10-30 ppm, and then 4m/t of MgSi wire is fed for deoxidation alloying. The main chemical components of the ladle refining slag are as follows: 55-65% of CaO and SiO2 17～22％、Al2O3 10～15％、CaF2 3～7％、Na2O 0.5～2％、FeO 1～3％。
In the continuous casting process, the whole-process protective casting is adopted, and the secondary oxidation of the molten steel is controlled.
A circular heating furnace procedure, wherein the circular heating furnace is divided into a preheating section, a heating section and a soaking section in sequence according to the conveying direction of the continuous casting round billet, and the temperature of each section is controlled respectively; wherein the temperature of the preheating section is controlled to be 930 ℃, the temperature of the heating section is controlled to be 1240 ℃, and the temperature of the soaking section is controlled to be 1240 ℃; the tapping temperature of the continuous casting round billet is 1135 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
In the perforation process, a novel conical two-roller perforator with a rolling angle of 15 degrees is adopted, the feeding angle is 15 degrees, the temperature before perforation of the continuous casting round billet is 1055 degrees, the temperature after perforation is 1140 degrees, the outer diameter of the capillary tube obtained after perforation is 202-212mm, and the wall thickness is 16.3-17.3 mm.
In the rolling process of the five-stand PQF unit, the temperature of the hollow billet before hot rolling is 1045 ℃, the outer diameter of the hollow billet obtained after rolling is 178-182mm, and the wall thickness is 10.6-11.1 mm. The external diameter of the pierced billet after the tube is taken off is 168-172mm, and the wall thickness is 10.8-11 mm.
In the micro-tension reducing procedure, the temperature of the pierced billet entering the micro-tension reducing procedure is 860 ℃, and the reducing rate is 35%.
In the quenching and tempering process, the rolled pipeline pipe is heated to 900 ℃ and is kept warm for 8min, then is quenched by water cooling, then is heated to 560 ℃ and is kept warm for 13min, and then is cooled to room temperature by air cooling.
The seamless line pipes prepared in examples 1 to 4 had a structure mainly comprising ferrite and tempered bainite, fine crystal grains, and a grain size of 10 grades, and the metallographic structure of the seamless line pipe prepared in example 1 is shown in fig. 1.
The yield strength, tensile strength, elongation, and transverse impact energy of seamless line pipes prepared in examples 1-4 were analyzed by random sampling according to the standard requirements of API Spec 5L version 46, and the statistical analysis results are shown in Table 1, wherein the number of samples in the table is the number of seamless line pipes taken, and random sampling is adopted.
TABLE 1
| Inspection item | Number of samples | Minimum value | Maximum value | Mean value of | Standard deviation of |
| Yield strength/MPa | 28 | 729 | 807 | 770.2 | 8.6 |
| Tensile strength/MPa | 28 | 824 | 875 | 854.3 | 8.2 |
| Elongation/percent | 28 | 25 | 30 | 28.4 | 1.7 |
| Charpy impact work/J | 28 | 173 | 203 | 190.1 | 8.1 |
As can be seen from the table above, the seamless pipeline pipe prepared by the method has the yield strength of 729-807MPa, the tensile strength of 824-875MPa, the elongation of not less than 25 percent and the transverse full-size Charpy impact power at 0 ℃ of 173-203J. Wherein the average value of the yield strength is 770.2MPa, and the standard deviation is 8.6 MPa; the average value of the tensile strength is 854.3MPa, and the standard deviation is 8.2 MPa; the yield ratio is less than or equal to 0.91; the average elongation is 28.4% and the standard deviation is 1.7%; the average value of transverse full-size Charpy impact energy at 0 ℃ is 190.1J, and the standard deviation is 8.1J.
The samples of examples 1-4 were evaluated for HIC performance according to NACE TM 0284-. After 96 hours of testing in the standard a solution, all samples from examples 1-4 had no hydrogen blistering on their surface, and the maximum average crack length ratio CLR, maximum average crack thickness ratio CTR, and maximum average crack ratio CSR were all 0.
In conclusion, the seamless pipeline pipe has the advantages of simple component system, low manufacturing cost, excellent strength, toughness and corrosion resistance, can be widely used for oil and gas transmission in ultra-deep water sea areas, and has wide market prospect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A high-strength seamless line pipe is characterized by comprising the following components in percentage by weight: c is more than or equal to 0.06 percent and less than or equal to 0.1 percent, Si is more than or equal to 0.15 percent and less than or equal to 0.35 percent, Mn is more than or equal to 1.75 percent and less than or equal to 1.55 percent and less than or equal to 0.55 percent and less than or equal to 0.35 percent, Mo is more than or equal to 0.25 percent and less than or equal to 0.15 percent, Ti is more than or equal to 0.03 percent and less than or equal to 0.01 percent, Mg is more than or equal to 0.001 percent and less than or equal to 0.002 percent, S is less than or equalPcm≤0.25％。
2. The high strength seamless line pipe of claim 1, wherein the microstructure is ferrite and tempered bainite.
3. A method of making a high strength seamless line pipe according to claim 1 or 2, comprising the steps of: heating the continuous casting round billet by an annular furnace, perforating to prepare a capillary, rolling the capillary to obtain a pierced billet, and reducing the diameter of the pierced billet by micro-tension to obtain a rolled pipeline; quenching and tempering the rolled pipeline pipe to obtain a high-strength seamless pipeline pipe; and the chemical composition of the continuous casting round billet is the same as that of the high-strength seamless pipeline pipe.
4. The method of claim 3, wherein the continuous casting round billet is produced from scrap steel by the steps of electric arc furnace melting, ladle refining and continuous casting.
5. The method for preparing a high-strength seamless line pipe as claimed in claim 4, wherein in the ladle refining process, FeTi alloy is added when the dissolved oxygen content in the molten steel is 10-30 ppm, and then MgSi wire is fed for deoxidation alloying.
6. The method according to claim 5, wherein the FeTi alloy is added in an amount of 0.8 to 1.2kg/t and the MgSi wire is added in an amount of 3 to 4m/t in the ladle refining step.
7. The method for preparing a high-strength seamless line pipe according to claim 4, wherein in the ladle refining process, the weight percentages of the components of the ladle refining slag are controlled within the following ranges: 55-65% of CaO and SiO2 17～22％、Al2O310～15％、CaF2 3～7％、Na2O 0.5～2％、FeO1～3％。
8. The method for producing a high-strength seamless line pipe according to claim 3, wherein the temperature at which the pierced pipe is subjected to the micro-tension reducing step in the micro-tension reducing step is 850 to 870 ℃, and the reduction ratio is 20 to 40%.
9. The method for producing a high-strength seamless line pipe according to claim 3, wherein the tempering step comprises heating the rolled line pipe to 900 to 950 ℃ and holding the temperature for 5 to 8min, cooling the line pipe with water, heating the line pipe to 520 to 580 ℃ and holding the temperature for 10 to 15min, and cooling the line pipe with air.
10. The method for producing a high-strength seamless line pipe according to claim 3, wherein in the annular furnace heating step, the annular furnace is divided into a preheating zone, a heating zone and a soaking zone in this order in the direction of conveyance of the continuously cast round billet, and the temperature of each zone is controlled separately; wherein the temperature of the preheating section is controlled to be 900-940 ℃, the temperature of the heating section is controlled to be 1240-1280 ℃, and the temperature of the soaking section is controlled to be 1240-1260 ℃; the discharging temperature of the continuous casting round billet is 1120-1140 ℃, and the material distribution angle of the annular furnace is 1.725 degrees.
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