A quenched and tempered X52 hydrogen sulfide corrosion resistant seamless line pipe and its preparation method

Abstract

The invention discloses a quenched and tempered X52 hydrogen sulfide corrosion resisting seamless line pipe and a preparation method thereof, and relates to the technical field of line pipe manufacturing. The quenched and tempered X52 hydrogen sulfide corrosion resisting seamless line pipe is prepared from, by weight percent, 0.11-0.14% of C, 0.15-0.35% of Si, 0.8-1.5% of Mn, 0.01-0.02% of Ti, 0.0015% or less of S, 0.01% or less of P, 0.015-0.030% of Al, 0.0015-0.0025% of Ca, 0.008% or less of N, 0.08% or less of Ni, 0.08% or less of Cu, 0.2% or less of Cr, 0.1% or less of Mo, 0.03% or less of V, 0.02% or less of Nb, 0.39% or less of CEQ, and the balance Fe and unavoidable impurities. The line pipe is simple in alloy component, low in cost, high in yield, excellent in mechanical performance and hydrogen sulfide corrosion resisting performance and capable of being widely applied to development of gas fields containing hydrogen sulfide.

Description

technical field

[0001] The invention relates to the technical field of line pipe manufacture. Background technique

[0002] According to statistics, about 1 / 3 of the world's proven oil and gas fields contain hydrogen sulfide gas, such as my country's Sichuan, Changqing, Zhongyuan, North China, Tarim and other oil and gas fields contain hydrogen sulfide gas to varying degrees. There are also many oil and gas fields containing hydrogen sulfide gas abroad, such as the Panama oil field in the United States and the Pincher Bay oil field in Alberta, Canada. If 20# carbon steel is still used as the gathering and transportation pipeline in the wet hydrogen sulfide environment, there will be serious corrosion problems, great potential safety hazards, and huge economic losses.

[0003] According to the prediction of international authoritative organizations, from 2000 to 2030, the world's oil demand will increase by an average of 1.6% annually, and will reach 5.769 billion tons in 20...

Examples

Embodiment 1

[0056] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting process, a continuous casting round billet with a diameter of Φ160 mm is produced. The weight percentage of its chemical composition is: C 0.11%, Si 0.28 %, Mn 1.0%, S0.0011%, P 0.008%, Ti 0.012%, Al 0.025%, Ca 0.002%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0057] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese, 1....

Embodiment 2

[0069] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing and continuous casting process, the continuous casting round billet with a diameter of Φ180 mm is produced. The weight percentage of its chemical composition is: C 0.12%, Si 0.23 %, Mn 1.1%, S0.0012%, P 0.007%, Ti 0.015%, Al 0.024%, Ca 0.0018%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0070] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008 wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese,...

Embodiment 3

[0082] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing and continuous casting process, the continuous casting round billet with a diameter of Φ210 mm is produced. The weight percentage of its chemical composition is: C 0.13%, Si 0.25 %, Mn 1.2%, S0.0011%, P 0.007%, Ti 0.013%, Al 0.026%, Ca 0.0021%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0083] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese, ...

technical field

[0001] The invention relates to the technical field of line pipe manufacture. Background technique

[0002] According to statistics, about 1 / 3 of the world's proven oil and gas fields contain hydrogen sulfide gas, such as my country's Sichuan, Changqing, Zhongyuan, North China, Tarim and other oil and gas fields contain hydrogen sulfide gas to varying degrees. There are also many oil and gas fields containing hydrogen sulfide gas abroad, such as the Panama oil field in the United States and the Pincher Bay oil field in Alberta, Canada. If 20# carbon steel is still used as the gathering and transportation pipeline in the wet hydrogen sulfide environment, there will be serious corrosion problems, great potential safety hazards, and huge economic losses.

[0003] According to the prediction of international authoritative organizations, from 2000 to 2030, the world's oil demand will increase by an average of 1.6% annually, and will reach 5.769 billion tons in 20...

Examples

Embodiment 1

[0056] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing, and continuous casting process, a continuous casting round billet with a diameter of Φ160 mm is produced. The weight percentage of its chemical composition is: C 0.11%, Si 0.28 %, Mn 1.0%, S0.0011%, P 0.008%, Ti 0.012%, Al 0.025%, Ca 0.002%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0057] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese, 1....

Embodiment 2

[0069] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing and continuous casting process, the continuous casting round billet with a diameter of Φ180 mm is produced. The weight percentage of its chemical composition is: C 0.12%, Si 0.23 %, Mn 1.1%, S0.0012%, P 0.007%, Ti 0.015%, Al 0.024%, Ca 0.0018%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0070] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008 wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese,...

Embodiment 3

[0082] Using scrap steel and pig iron as raw materials, through 80t electric arc furnace melting, ladle refining, VD vacuum degassing and continuous casting process, the continuous casting round billet with a diameter of Φ210 mm is produced. The weight percentage of its chemical composition is: C 0.13%, Si 0.25 %, Mn 1.2%, S0.0011%, P 0.007%, Ti 0.013%, Al 0.026%, Ca 0.0021%, N 0.007%, Ni 0.03%, Cu 0.04%, Cr0.05%, the rest is Fe and unavoidable of impurities.

[0083] In the electric arc furnace smelting process, arc heat is used to melt pig iron and scrap steel and raise the temperature of the molten pool. Cluster oxygen lances are used to blow oxygen for decarburization and temperature increase, and 3t of active lime is added for slagging and dephosphorization. When the carbon content in the molten pool is 0.06- 0.09 wt.%, phosphorus content ≤ 0.008wt.%, and the temperature is 1600-1630 ℃ before steel can be tapped. Add 1.5~2.5kg / t aluminum ingot, 8~9 kg / t metal manganese, ...

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