High-strength corrosion-resistant aluminum alloy for variable-diameter drill pipe body and manufacturing method of aluminium alloy

A manufacturing method and technology of drill pipe, which is applied in the field of hot extrusion manufacturing, can solve the problems of untested corrosion resistance and fatigue resistance, and achieve the effects of hindering the recrystallization process, high strength, and improving machinability

Active Publication Date: 2018-12-28
山东兖矿轻合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing similar products usually use 1953 alloy, mechanical properties Rm≥530MPa, Rp0.2≥480MPa, A≥7%, no corrosion resistance and fatigue resistance test

Method used

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  • High-strength corrosion-resistant aluminum alloy for variable-diameter drill pipe body and manufacturing method of aluminium alloy
  • High-strength corrosion-resistant aluminum alloy for variable-diameter drill pipe body and manufacturing method of aluminium alloy
  • High-strength corrosion-resistant aluminum alloy for variable-diameter drill pipe body and manufacturing method of aluminium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0045] A high-strength corrosion-resistant aluminum alloy for a variable-diameter drill pipe body, the chemical composition is calculated by weight percentage, including: Zn: 6%, Mg: 2.8%, Cu: 0.7%, Fe: 0.15%, Zr: 0.05%, Ti: 0.02%, Mn: 0.2%, Cr: 0.15%, and the balance is Al and unavoidable impurities.

[0046] The manufacturing method of the pipe body for the above-mentioned variable-diameter drill pipe is as follows: cast the above-mentioned raw materials into a round cast rod; under the condition of a heating rate of 10°C / min, heat the round cast rod to 340°C, keep it warm for 10h, and finally heat it to 450°C ℃, heat preservation for 32h, and then naturally lowered to room temperature to obtain a homogenized round cast rod; according to the A-level flaw detection requirements in GB / T 6519, 100% of the round rod is subjected to ultrasonic flaw detection; the round rod is turned, bored, Obtain a round hollow rod; heat the round hollow rod to 400°C for variable cross-section e...

Embodiment 2

[0055] A high-strength corrosion-resistant aluminum alloy for a variable-diameter drill pipe body, the chemical composition is calculated by weight percentage, including: Zn: 6.3%, Mg: 2.5%, Cu: 0.5%, Fe: 0.1%, Zr: 0.10%, Ti: 0.04%, Mn: 0.3%, Cr: 0.25%, and the balance is Al and unavoidable impurities.

[0056] The manufacturing method of the above-mentioned aluminum alloy drill pipe body is as follows: casting the above-mentioned raw materials into a round cast rod; under the condition of a heating rate of 15°C / min, heating the round cast rod to 365°C, holding it for 8.5h, and finally heating to 465°C, keep warm for 28 hours, then cool down to room temperature naturally, and obtain round cast rods that have been homogenized; according to the A-level flaw detection requirements in GB / T 6519, 100% of the round rods are subjected to ultrasonic flaw detection; the round rods are turned and bored , to get a round hollow rod; heat the round hollow rod to 410°C, and carry out variab...

Embodiment 3

[0064] A high-strength corrosion-resistant aluminum alloy for a variable-diameter drill pipe body, the chemical composition is calculated by weight percentage, including: Zn: 5.5%, Mg: 3.1%, Cu: 0.9%, Fe: 0.15%, Zr: 0.05%, Ti: 0.06%, Mn: 0.1%, Cr: 0.1%, and the balance is Al and unavoidable impurities.

[0065] The manufacturing method of the above-mentioned aluminum alloy drill pipe body is as follows: casting the above-mentioned raw materials into a round cast rod; under the condition of a heating rate of 18°C / min, heating the round cast rod to 360°C, holding it for 8.5h, and finally heating to 460°C, keep warm for 25h, then cool down to room temperature naturally to obtain round cast rods that have been homogenized; according to the A-level flaw detection requirements in GB / T 6519, 100% of the round rods are subjected to ultrasonic flaw detection; the round rods are turned and bored , to obtain a round hollow rod; heat the round hollow rod to 395°C, and carry out variable c...

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Abstract

The invention discloses a high-strength corrosion-resistant aluminum alloy for a variable-diameter drill pipe body and a manufacturing method of the aluminium alloy. The aluminium alloy comprises, inpercentage by weight, Zn: 5.5-6.3%, Mg: 2.5-3.1 %, Cu: 0.5 to 0.9%, Fe: <=0.2%, Zr: <= 0.15%, Ti: <=0.1%, Mn: 0.1 to 0.3%, Cr: 0.1 to 0.25%, and the balance being Al and unavoidable impurities. An aluminum alloy variable-diameter drill pipe body prepared by manufacturing method of the invention has high strength, good corrosion resistance and fatigue resistance, and the technical indexes such as dimensional precision and concentricity are high in control level, and the prepared drill pipe body is stable in quality, good in overall performance, low in cost and conducive to industrial batch production and field application.

Description

technical field [0001] The invention relates to the technical field of hot extrusion manufacturing, in particular to a high-strength corrosion-resistant aluminum alloy for a variable-diameter drill pipe body and a manufacturing method thereof. Background technique [0002] Reduced diameter drill pipe: This type of product is mainly an inner thickened or outer thickened pipe formed by variable diameter extrusion, and a pipe with a reduced diameter transition section at the outer thickened position. Aluminum alloy drill pipe has the advantages of high specific strength, low density, and small bending stress. It has significant advantages in improving drilling depth, corrosion resistance, reducing hook load, and drilling operations in directional and horizontal wells. It is a deep and ultra-deep well. And key materials urgently needed for low-temperature mining. [0003] The existing similar products usually use 1953 alloy, the mechanical properties Rm≥530MPa, Rp0.2≥480MPa, A≥...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/053
Inventor 王玉刚李永卉王鹏聂波鹿兵董阳杨富波欧庆峰郭利刘凯韩洪昌崔伟超王涛刘浩韦艳琴张新峰孔令均冯骥吴茂来韩正乾刘博张寒鞠克江徐欣欣魏凯歌傅冰霜白凯
Owner 山东兖矿轻合金有限公司
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