CN118287528A - Manufacturing method of seamless pipeline steel tube X60QS for ultra-thick wall low temperature - Google Patents
Manufacturing method of seamless pipeline steel tube X60QS for ultra-thick wall low temperature Download PDFInfo
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- CN118287528A CN118287528A CN202410230022.0A CN202410230022A CN118287528A CN 118287528 A CN118287528 A CN 118287528A CN 202410230022 A CN202410230022 A CN 202410230022A CN 118287528 A CN118287528 A CN 118287528A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 59
- 239000010959 steel Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 47
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 238000005496 tempering Methods 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 238000004513 sizing Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000000126 substance Substances 0.000 claims description 17
- 238000010791 quenching Methods 0.000 claims description 15
- 230000000171 quenching effect Effects 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 12
- 238000004321 preservation Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 6
- 238000009749 continuous casting Methods 0.000 claims description 5
- 230000001580 bacterial effect Effects 0.000 claims description 3
- 239000002826 coolant Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 238000005275 alloying Methods 0.000 abstract description 8
- 238000013461 design Methods 0.000 abstract description 6
- 229910000617 Mangalloy Inorganic materials 0.000 abstract description 3
- QFGIVKNKFPCKAW-UHFFFAOYSA-N [Mn].[C] Chemical compound [Mn].[C] QFGIVKNKFPCKAW-UHFFFAOYSA-N 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 4
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- 229910021538 borax Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000004328 sodium tetraborate Substances 0.000 description 3
- 235000010339 sodium tetraborate Nutrition 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000008186 active pharmaceutical agent Substances 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
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- 238000005266 casting Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- FBPFZTCFMRRESA-JGWLITMVSA-N D-glucitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-JGWLITMVSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000005098 hot rolling Methods 0.000 description 1
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- 238000003466 welding Methods 0.000 description 1
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Abstract
The invention discloses a manufacturing method of a seamless pipeline steel tube X60QS for ultra-thick wall low temperature, which comprises the following steps of: heating in a ring furnace, perforating by a perforating machine, PQF hot continuous rolling, pipe removal, sizing, cooling by a cooling bed, sawing, straightening, tempering heat treatment, flaw detection, water pressure, packaging and warehousing. The invention adopts a proper amount of low carbon-manganese steel as a base, adopts a component design system with micro alloying element V as a main alloying element, and meets the requirements of alpine regions through tempering heat treatment.
Description
Technical Field
The invention relates to the field of ferrous metal pressure processing, in particular to a manufacturing method of a seamless pipeline steel tube X60QS for ultra-thick wall low temperature.
Background
The region with the temperature below-40 ℃ is called an extremely cold region, and the arctic region is an extremely cold region which is a famous and true region, and in recent years, with the increasing demand of global oil and gas resources, the extremely cold region which is rich in petroleum and natural gas becomes a hot spot region for global oil and gas resource exploitation and pipeline construction. At present, no clear pipeline steel rolling and pipe making standard exists for low-temperature pipelines in China, the international general pipeline steel pipe manufacturing standard ISO 3183, API Spec 5L and the domestic test temperature required by GB/T9711 are all 0 ℃, the most representative Western gas east transport two-line and three-line engineering in China all have requirements on single-value and average value of impact power of base metal, HAZ and welding lines at-10 ℃, the lowest temperature of surface pipelines of Daqing and Xinjiang oil fields in China is-34 ℃, the low-temperature liquid-gas separator of the first-line southwest transport first-line is brittle, serious consequences are caused, in recent years, brittle burst frequently occurs in the low-temperature pressure test process of a high-grade pipeline tee joint, the problem of low-temperature brittle fracture of a conveying pipe needs to be high valued in recent years, the invention adopts a proper amount of low-carbon-manganese steel as a base, and takes micro-alloying element V as a main alloy element, and tempers a seamless pipeline meeting the requirements of ultra-thick-wall low-temperature X60QS performance for conveying in the alpine region is quenched and tempered, and tempered at-46 ℃.
Disclosure of Invention
The invention aims to provide a manufacturing method of an X60QS (X60 QS) seamless pipeline steel pipe for ultra-thick wall low temperature, which is characterized in that an appropriate amount of low-carbon-manganese steel is adopted as a base, a component design system with micro alloying element V as a main alloying element is adopted, and the X60QS ultra-thick seamless pipeline steel pipe for low temperature oil and gas transportation in high and cold areas is produced through tempering heat treatment.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention relates to a manufacturing method of a seamless pipeline steel tube X60QS for ultra-thick wall low temperature, which comprises the following steps of, by mass, C:0.10-0.16％、Si：0.10-0.35％、Mn：1.30-1.60％、V:0.04-0.07％,Ti：0.005-0.020％,Al：0.005-0.045％,P：≤0.018％,S：≤0.003％, chemical components of the seamless pipeline steel tube X60QS for ultra-thick wall low temperature and the balance of Fe and impurity elements; the manufacturing process of the continuous casting round pipe blank of the seamless pipeline steel pipe X60QS for ultra-thick wall low temperature meeting the requirements of the components comprises the following steps: heating in a ring furnace, perforating by a perforating machine, PQF hot continuous rolling, pipe removal, sizing, cooling by a cooling bed, sawing, straightening, tempering heat treatment, flaw detection, water pressure, packaging and warehousing; wherein:
The heating temperature of the heating furnace in the annular furnace is as follows: heating the first section to 1020-1080 ℃, heating the second section to 1120-1180 ℃, heating the third section to 1200-1260 ℃, heating the fourth section to 1240-1280 ℃, heating the fifth section to 1240-1280 ℃ and heating the sixth section to 1220-1260 ℃; the heat preservation time is 5-6 hours;
Perforating the circular tube blank heated by the annular furnace in a bacterial perforating machine after discharging the circular tube blank from the annular furnace, wherein the perforating temperature is 1200-1260 ℃; rolling the perforated steel tube by a PQF continuous rolling mill, wherein the rolling temperature is controlled to be 1000-1200 ℃; and finally adjusting the size of the pierced billet after hot continuous rolling through a sizing machine.
Quenching and tempering the steel pipe which is hot rolled into the required specification, wherein the quenching temperature is 930 ℃ plus or minus 10 ℃, the heat preservation time is 40-50 minutes, the cooling mode adopts internal spraying and external spraying, the cooling medium is water, the tempering is 620 ℃ plus or minus 10 ℃, the heat preservation time is 60-75 minutes, and then the steel pipe is discharged from the furnace for air cooling.
Further, the chemical components of the X60QS mass percent of the ultra-thick wall low-temperature seamless pipeline steel pipe are that C is 0.10 percent, si:0.10%, mn:1.30%, V0.04%, ti:0.005%, al:0.005%, P:0.018%, S:0.003% of Fe and impurity elements in balance.
Further, the chemical components of the X60QS mass percent of the ultra-thick wall low-temperature seamless pipeline steel pipe are that C is 0.12 percent, si:0.15%, mn:1.38%, V0.05%, ti:0.008%, al:0.015%, P:0.016%, S:0.002%, and the balance of Fe and impurity elements.
Further, the chemical components of the X60QS mass percent of the ultra-thick wall low-temperature seamless pipeline steel pipe are that C is 0.13 percent, si:0.25%, mn:1.46%, V0.06%, ti:0.011%, al:0.025%, P:0.014%, S:0.003% of Fe and impurity elements in balance.
Further, the chemical components of the X60QS mass percent of the ultra-thick wall low-temperature seamless pipeline steel pipe are that C is 0.15 percent, si:0.30%, mn:1.55%, V0.05%, ti:0.015%, al:0.035%, P:0.012%, S:0.002%, and the balance of Fe and impurity elements.
Further, the chemical components of the X60QS mass percent of the ultra-thick wall low-temperature seamless pipeline steel pipe are that C is 0.16 percent, si:0.35%, mn:1.60%, V0.07%, ti:0.020%, al:0.045%, P:0.010%, S:0.003% of Fe and impurity elements in balance.
Compared with the prior art, the invention has the beneficial technical effects that:
The C-Mn is the most economical element for improving the strength of the seamless steel pipe, the low C content is the most effective means for controlling the low-temperature toughness of the pipeline pipe, the lower the carbon content is, the better the low-temperature impact toughness is, in order to simultaneously consider the strength of the ultra-thick-wall pipeline pipe for the severe cold region and the low-temperature impact toughness of minus 46 ℃, the C content is properly reduced and a certain amount of Mn content is matched, meanwhile, only micro-alloying elements V and Ti are added, V and Ti are all micro-alloying elements, the effect of grain refinement is achieved, the grain refinement grain belongs to the most effective method for improving the strength and toughness at the same time, V can precipitate and separate out grain structures of refined steel in a medium temperature region, the hardenability of the steel can be improved when the steel is fused into austenite at a high temperature, the defect that the natural hardenability of the pipeline steel pipe is insufficient is overcome, the Ti can refine grains of a casting blank, the columnar crystal shrinkage zone of the equiaxial crystals of the continuous casting blank is increased, meanwhile, V+Ti belongs to the micro-alloying elements, the alloy addition amount is small, and the cost is low.
In order to achieve the production efficiency and the heating quality of a large round tube casting blank, the first heating section is slowly heated under a heating system of 1020-1080 ℃, so that the efficiency can be improved, cracks cannot be generated due to overlarge stress, the second heating section and the third heating section are heated by adopting a heating system with gradient temperature, the overall heating temperature of the tube blank is guaranteed to be uniform, the setting temperatures of the four sections to the five sections are consistent with 1240-1280 ℃ and have a certain heat preservation time, the overall heating of the final round tube blank is guaranteed to be uniform and transparent, the alloy is fully and solid-solution-diffused uniformly, the six sections are properly reduced to 1220-1260 ℃ for subsequent perforation, the perforation is controlled in a region with good steel blank plasticity after the round tube blank is discharged from an annular heating furnace, the perforation is the region with the most severe deformation of a seamless steel tube, the perforation temperature is set in the region with the best steel tube plasticity, the inner and outer surface quality of the steel tube is controlled, and the subsequent hot rolling and sizing is guaranteed to be in a temperature region with good deformation.
The heat treatment adopts quenching and tempering, the quenching temperature is 930 ℃ plus or minus 10 ℃, the quenching temperature is about 30 ℃ higher than the heating temperature of the common pipeline steel grade, and the quenching temperature is mainly used for ensuring that the temperature of the steel pipe before being sprayed outside and sprayed inside after the steel pipe is out of a quenching furnace is completely in an austenite region, so that the quenching is sufficient, the two-phase structure before the quenching is prevented from deteriorating the performance of the steel pipe, and meanwhile, tempering is carried out at 620 ℃, the temperature belongs to high-temperature tempering, and the obtained tempered sorbite has good strength and toughness matching.
Detailed Description
The present invention will be specifically described below by way of specific examples.
The phi 430mm round pipe blank meeting the chemical composition requirements of the invention is adopted to roll into a steel pipe with the specification of phi 355.6mm multiplied by 35.71mm, and then quenching and tempering heat treatment is carried out.
The production process flow is as follows: heating in a ring furnace, perforating by a perforating machine, PQF hot continuous rolling, pipe removal, sizing, cooling by a cooling bed, sawing, straightening, tempering heat treatment, flaw detection, water pressure, packaging and warehousing.
The following is a brief description of a specific production process flow:
1. The heating temperature of the annular furnace for heating the phi 430mm continuous casting round tube blank is as follows: heating the first section to 1020-1080 ℃, heating the second section to 1120-1180 ℃, heating the third section to 1200-1260 ℃, heating the fourth section to 1240-1280 ℃, heating the fifth section to 1240-1280 ℃, and heating the sixth section to 1220-1260 ℃, wherein the heat preservation time is 5-6 hours;
2. And (3) perforating the continuous casting round tube blank heated by the annular furnace in a bacterial perforating machine after discharging, wherein the perforating temperature is 1200-1260 ℃.
3. And blowing a proper amount of borax into the perforated capillary tube, ensuring that the borax is lubricated uniformly on the inner surface of the whole steel tube and does not agglomerate, transversely moving the capillary tube after blowing the borax to a phi 460mm PQF continuous rolling tube unit for rolling, controlling the rolling temperature to be 1000-1200 ℃, keeping the central lines of rolling mills aligned in the hot continuous rolling process, reasonably distributing the hole patterns of each frame, and adopting an EMS online size monitoring system to ensure the size precision requirement of the steel tube. And (5) sizing the hot continuous rolled capillary tube in a sizing mill to achieve the required finished tube size.
4. And (3) naturally cooling the finished steel pipe passing through a cooling bed of a sizing mill, and then sawing the finished steel pipe into the required steel pipe length.
5. Quenching and tempering heat treatment is carried out on the rolled steel pipe with the required specification, the quenching temperature is 930 ℃ plus or minus 10 ℃, the heat preservation time is 40-50 minutes, the cooling mode adopts internal spraying and external spraying, the cooling medium is water, the tempering is 620 ℃ plus or minus 10 ℃, the heat preservation time is 60-75 minutes, and then the steel pipe is packaged and put in storage after the air cooling after being taken out of the furnace, the flaw detection, the water pressure, the chamfering and the physical and chemical property detection of the material.
The 5 different examples of the ultra-thick wall low-temperature seamless pipeline steel tube X60QS with phi 355.6X35.71 produced by the above process were tested for chemical composition, stretching and low-temperature impact at-46 ℃, and the actual test data are shown in tables 1 and 2.
Table 15 chemical Components (Wt%)
Table 25 tensile impact Properties of examples
Results: as can be seen from tables 1 and 2, the chemical compositions of the 5 finished products meet the requirements of the invention, and through quenching and tempering, 5 tensile properties of the phi 355.6X35.71 extra-thick-wall steel pipe can meet the requirements of the API 5L standard on X60QS, the standard is about 50MPa-80MPa beyond the standard, and a certain margin is provided, so that the requirements can be met by adopting V, ti alloy elements without adding excessive alloy elements for reasonable design of steel components, the requirements of economy and tensile properties are both met, the impact energy of the transverse full-size sample at-46 ℃ reaches more than 110J, and the design requirement is about 4 times beyond the design requirement, so that the X60QS low-temperature toughness is good, and the performance requirement of the ultra-thick-wall low-temperature X60QS seamless pipeline steel pipe for oil and gas transportation in high and cold areas can be met.
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (6)
1. A manufacturing method of a seamless pipeline steel tube X60QS for ultra-thick wall low temperature is characterized in that the chemical composition of the mass percent of the seamless pipeline steel tube X60QS for ultra-thick wall low temperature is C:0.10-0.16％、Si：0.10-0.35％、Mn：1.30-1.60％、V:0.04-0.07％,Ti：0.005-0.020％,Al：0.005-0.045％,P：≤0.018％,S：≤0.003％,, and the balance is Fe and impurity elements; the continuous casting round tube blank meeting the requirements of the components is adopted, and the manufacturing process comprises the following steps: heating in a ring furnace, perforating by a perforating machine, PQF hot continuous rolling, pipe removal, sizing, cooling by a cooling bed, sawing, straightening, tempering heat treatment, flaw detection, water pressure, packaging and warehousing; wherein:
The heating temperature of the heating furnace in the annular furnace is as follows: heating the first section to 1020-1080 ℃, heating the second section to 1120-1180 ℃, heating the third section to 1200-1260 ℃, heating the fourth section to 1240-1280 ℃, heating the fifth section to 1240-1280 ℃ and heating the sixth section to 1220-1260 ℃; the heat preservation time is 5-6 hours;
Perforating the circular tube blank heated by the annular furnace in a bacterial perforating machine after discharging the circular tube blank from the annular furnace, wherein the perforating temperature is 1200-1260 ℃; rolling the perforated steel tube by a PQF continuous rolling mill, wherein the rolling temperature is controlled to be 1000-1200 ℃; and finally adjusting the size of the pierced billet after hot continuous rolling through a sizing machine.
Quenching and tempering the steel pipe which is hot rolled into the required specification, wherein the quenching temperature is 930 ℃ plus or minus 10 ℃, the heat preservation time is 40-50 minutes, the cooling mode adopts internal spraying and external spraying, the cooling medium is water, the tempering is 620 ℃ plus or minus 10 ℃, the heat preservation time is 60-75 minutes, and then the steel pipe is discharged from the furnace for air cooling.
2. The method for producing a seamless steel pipe for ultra-thick wall and low temperature according to claim 1, wherein the chemical composition of the seamless steel pipe for ultra-thick wall and low temperature X60QS is 0.10% by mass of C:0.10%, mn:1.30%, V0.04%, ti:0.005%, al:0.005%, P:0.018%, S:0.003% of Fe and impurity elements in balance.
3. The method for producing a seamless steel pipe for ultra-thick wall and low temperature according to claim 1, wherein the chemical composition of the seamless steel pipe for ultra-thick wall and low temperature X60QS is 0.12% by mass of C:0.15%, mn:1.38%, V0.05%, ti:0.008%, al:0.015%, P:0.016%, S:0.002%, and the balance of Fe and impurity elements.
4. The method for producing a seamless steel pipe for ultra-thick wall and low temperature according to claim 1, wherein the chemical composition of the seamless steel pipe for ultra-thick wall and low temperature X60QS is 0.13% by mass of C: 0.25%, mn:1.46%, V0.06%, ti:0.011%, al:0.025%, P:0.014%, S:0.003% of Fe and impurity elements in balance.
5. The method for producing a seamless steel pipe for ultra-thick wall and low temperature according to claim 1, wherein the chemical composition of the seamless steel pipe for ultra-thick wall and low temperature X60QS is 0.15% by mass of C: 0.30%, mn:1.55%, V0.05%, ti:0.015%, al:0.035%, P:0.012%, S:0.002%, and the balance of Fe and impurity elements.
6. The method for producing a seamless steel pipe for ultra-thick wall and low temperature according to claim 1, wherein the chemical composition of the seamless steel pipe for ultra-thick wall and low temperature X60QS is 0.16% by mass of C: 0.35%, mn:1.60%, V0.07%, ti:0.020%, al:0.045%, P:0.010%, S:0.003% of Fe and impurity elements in balance.
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