Aluminum alloy for 480 MPa-class aluminum alloy oil pipe and pipe manufacturing method thereof

A 480mpa, aluminum alloy technology, applied in the field of oil pipe manufacturing, can solve the problems of low hydrogen sulfide stress corrosion resistance, high processing performance requirements, long delivery cycle and other problems of completion pipe strings, and achieve the elimination of segregation of different ingots, Excellent corrosion resistance and low cost

Active Publication Date: 2015-07-01
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently commonly used corrosion-resistant alloy oil pipes such as nickel-based alloy oil pipes, iron-nickel-based alloy oil pipes, duplex stainless steel oil pipes, and martensitic stainless steel oil pipes are mostly designed with high alloying of precious metal elements such as Ni, Mo, and Cr, and the cost is relatively high. Low specific strength, complex process, difficult processing, high processing performance requirements, low yield, long delivery cycle, low hydrogen sulfide stress corrosion resistance of completion pipe string

Method used

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  • Aluminum alloy for 480 MPa-class aluminum alloy oil pipe and pipe manufacturing method thereof
  • Aluminum alloy for 480 MPa-class aluminum alloy oil pipe and pipe manufacturing method thereof
  • Aluminum alloy for 480 MPa-class aluminum alloy oil pipe and pipe manufacturing method thereof

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Embodiment 1

[0036] The present invention is an aluminum alloy for 480MPa grade aluminum alloy oil pipe. Its chemical composition in weight percentage includes: 6.90% of Zn, 1.75% of Mg, 0.18% of Cu, 0.28% of Mn, 0.20% of Cr, 0.02% of Cr Ti, 0.18% Zr, and the rest are Al and inevitable impurities, wherein the inevitable impurities include 0.13% Fe and 0.15% Si in the total weight of the aluminum alloy.

[0037]The manufacturing method of the above-mentioned 480MPa aluminum alloy tubing for aluminum alloy tubing is as follows: the above-mentioned raw materials are smelted and refined outside the furnace, and then cast to obtain a tube billet, and the tube billet is heated to 375°C, 415°C, and 460°C in a heating furnace for three times. Level homogenization treatment, the corresponding holding time is 8h, 8h, 10h; the tube billet extrusion temperature is 430°C, the extrusion ratio is greater than 18, and the extrusion speed is 3mm / s; the two-stage solid solution treatment temperature is 440°C...

Embodiment 2

[0040] The present invention is an aluminum alloy for 480MPa grade aluminum alloy oil pipe, its chemical composition includes: 5.10% of Zn, 1.15% of Mg, 0.19% of Cu, 0.30% of Mn, 0.20% of Cr, 0.02% of Ti, 0.15% of Zr, the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.15% of Fe and 0.15% of Si which account for the total weight of the aluminum alloy.

[0041] The manufacturing method of the above-mentioned 480MPa aluminum alloy tubing for aluminum alloy tubing is as follows: the above-mentioned raw materials are smelted and refined outside the furnace, and then cast to obtain a tube billet, and the tube billet is heated to 360°C, 405°C, and 445°C in a heating furnace for three times. Stage homogenization treatment, the corresponding holding time is 8h, 8h, 10h; the tube billet extrusion temperature is 420°C, the extrusion ratio is greater than 18, and the extrusion speed is 4mm / s; the two-stage solution treatment temperature...

Embodiment 3

[0044] The present invention is an aluminum alloy for 480MPa grade aluminum alloy oil pipe, its chemical composition includes: 5.90% Zn, 1.58% Mg, 0.20% Cu, 0.30% Mn, 0.25% Cr, 0.02% Ti, 0.20% of Zr, the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.13% of Fe and 0.12% of Si which account for the total weight of the aluminum alloy.

[0045] The manufacturing method of the above-mentioned 480MPa aluminum alloy tubing for aluminum alloy tubing is as follows: the above-mentioned raw materials are smelted and refined outside the furnace, and then cast to obtain a tube blank, and the tube blank is heated to 370°C, 412°C, and 450°C in a heating furnace for three times. Stage homogenization treatment, the corresponding holding time is 8h, 8h, 10h; the tube billet extrusion temperature is 430°C, the extrusion ratio is greater than 18, and the extrusion speed is 5mm / s; the two-stage solid solution treatment temperature is 440°C, 470...

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Abstract

The invention discloses an aluminum alloy for a 480 MPa-class aluminum alloy oil pipe. The aluminum alloy comprises the following components by weight percent: 5.10-6.90% of Zn, 1.10-1.80% of Mg, 0.05-0.20% of Cu, 0.10-0.30% of Mn, 0.10-0.30% of Cr, 0.01-0.02% of Ti, 0.15-0.2% of Zr and the balance of Al and unavoidable impurities, wherein in the unavoidable impurities, the content of the Si is not greater than 0.15 of the total weight of the aluminum alloy and the content of Fe is not greater than 0.15 of the total weight of the aluminum alloy. The manufacture method of the aluminum alloy pipe comprises the following steps: (1) smelting the raw materials according to the weight percentage, performing external refining and casting to obtain a pipe blank; (2) performing three-stage homogenization treatment; (3) squeezing under high temperature; (4) performing twin-stage solid solution treatment, quenching and cooling; (5) prestretching and deforming; and (6) performing twin-stage artificial aging treatment.

Description

technical field [0001] The invention relates to the technical field of oil pipe manufacturing, in particular to an aluminum alloy for 480MPa grade aluminum alloy oil pipe and a method for manufacturing a pipe material thereof. Background technique [0002] With the development of the petroleum industry, the performance and cost requirements of the corrosion-resistant alloy tubing for oil pipes have been continuously improved. Aluminum alloy tubing has the characteristics of high specific strength, good plasticity and toughness, excellent corrosion resistance and fatigue resistance, and its research has received extensive attention. [0003] At present, the commonly used corrosion-resistant alloy tubing such as nickel-based alloy tubing, iron-nickel-based alloy tubing, duplex stainless steel tubing, martensitic stainless steel tubing, etc. are mostly designed with high alloying of precious metal elements such as Ni, Mo, Cr, etc., and the cost is high. Low specific strength, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22F1/053
Inventor 冯春王鹏朱丽娟韩礼红冯耀荣
Owner BC P INC CHINA NAT PETROLEUM CORP
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