Method for improving room temperature strength and high-temperature performance of Al-Cu-Mg alloy for aluminum alloy drilling rod

An al-cu-mg, high-temperature performance technology is applied in the field of improving the room temperature strength and high-temperature performance of Al-Cu-Mg alloys for aluminum alloy drill pipes, which can solve problems such as increasing costs and achieve the effect of reducing costs.

Inactive Publication Date: 2014-11-26
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0005] In the process of realizing the present invention, the inventor finds that the prior art has at least the following problems: the method of improving the heat resistance of the alloy by adding alloying elements such as Fe, Ni, Ag will inevitably increase the cost, especially for adding elements like Ag and Ni This is especially true for such expensive alloying elements

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  • Method for improving room temperature strength and high-temperature performance of Al-Cu-Mg alloy for aluminum alloy drilling rod
  • Method for improving room temperature strength and high-temperature performance of Al-Cu-Mg alloy for aluminum alloy drilling rod
  • Method for improving room temperature strength and high-temperature performance of Al-Cu-Mg alloy for aluminum alloy drilling rod

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Embodiment 1

[0047] This example provides a method for improving room temperature strength and high temperature performance of Al-Cu-Mg alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 15 And Table 1, the method includes: after the Al-Cu-Mg alloy that has undergone solid solution is pre-stretched and deformed by 0 to 8%, it is heated to 160°C to 190°C, kept for 4 hours to 120 hours, and then air-cooled, and the Al-Cu - The copper-magnesium content ratio in the Mg alloy is less than or equal to 5. The composition and weight percentage of the Al-Cu-Mg alloy are: Cu: 3.8% to 4.5%, Mg: 1.2% to 1.6%, Mn: 0.3% to 0.9%, Ti: 0.05% to 0.20%, and the balance is Al. The solid solution temperature of the Al-Cu-Mg alloy is 470°C to 500°C. The solid solution time of the Al-Cu-Mg alloy is 50 minutes to 90 minutes. The Al-Cu-Mg alloy is cooled by water quenching after solid solution. The Al-Cu-Mg alloy obtains more S' strengthening phase structure dispersed and precip...

Embodiment 2

[0049] The embodiment of the present invention provides a method for improving the room-temperature strength and high-temperature performance of Al-Cu-Mg alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 15 And Table 1, the method includes: after the Al-Cu-Mg alloy that has undergone solid solution is pre-stretched and deformed by 0 to 8%, it is heated to 160°C to 190°C, kept for 4 hours to 120 hours, and then air-cooled, and the Al-Cu - The copper-magnesium content ratio in the Mg alloy is less than or equal to 5. The composition and weight percentage of the Al-Cu-Mg alloy are: Cu: 4.0% to 4.3%, Mg: 1.5% to 1.6%, Mn: 0.4% to 0.6%, Ti: 0.1% to 0.15%, and the balance is Al. Wherein, the solid solution temperature of the Al-Cu-Mg alloy is 450°C to 500°C. The solid solution time of the Al-Cu-Mg alloy is 60 minutes to 90 minutes. Al-Cu-Mg alloy is cooled by water quenching after solid solution.

Embodiment 3

[0051] The embodiment of the present invention provides a method for improving the room-temperature strength and high-temperature performance of Al-Cu-Mg alloys for aluminum alloy drill pipes, combined with reference Figure 1 to Figure 15 And Table 1, the composition of the Al-Cu-Mg alloy and the percentage by weight of each composition are: 4.0% Cu, 1.2% Mg, 0.6% Mn, 0.2% Ti, and the balance is Al. The aluminum alloy sheet of this composition is solid-dissolved at 500°C for 1 hour and quenched in water, the pre-stretch deformation is 0%, and the tensile mechanical properties at room temperature after aging at 160°C for 120 hours reach: the tensile strength is 500MPa, the yield strength It is 367MPa, and the elongation is 17%; the high-temperature tensile performance at 200°C reaches: the tensile strength is 386MPa, the yield strength is 314MPa, and the elongation is 18%.

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Abstract

The invention discloses a method for improving room temperature strength and high-temperature performance of Al-Cu-Mg alloy for an aluminum alloy drilling rod. The method comprises the steps that the Al-Cu-Mg alloy is pre-stretched and deformed by 0 percent to eight percent after solution treatment, and then is heated to 160 DEG C to 190 DEG C, heat preservation is carried out on the alloy for four hours to 120 hours, then, the alloy is taken out of a furnace, air cooling is carried out on the alloy, and the content ratio of copper to magnesium in the Al-Cu-Mg alloy is smaller than or equal to five. Through the suitable heat treatment technology, the Al-Cu-Mg alloy is made to obtain a strengthening phase which has the better dispersion and heat stability performance, and therefore compared with the conventional T6 state, the alloy has the better excellent room temperature tensile property, the higher high-temperature tensile strength and residual tensile strength after being thermally exposed for a long time

Description

technical field [0001] The invention relates to the technical field of heat treatment of aluminum alloys, in particular to a method for improving room-temperature strength and high-temperature performance of Al-Cu-Mg alloys for aluminum alloy drill pipes. Background technique [0002] Al-Cu-Mg alloy with low Cu / Mg ratio has good strength and toughness, fatigue resistance, hydrogen sulfide corrosion resistance and certain heat resistance due to its low density and good application in the field of oil drilling as oil drill pipe material prospect. The aging precipitation sequence of this series of alloys is: GPB zone, S′ phase, S phase. According to different service conditions, the heat treatment state of the alloy is also different, so the microstructure state in the alloy is also different. As an alloy with high strength and high toughness, the commonly used aging state is the peak strength aging state (T6). In this state, the strength of the alloy reaches the peak, and it...

Claims

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Application Information

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IPC IPC(8): C22F1/057
Inventor 冯春卢强宋生印杨成新刘永刚腾学清
Owner BC P INC CHINA NAT PETROLEUM CORP
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