A kind of aluminum alloy for 480mpa grade aluminum alloy oil pipe and its pipe material manufacturing method

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: 2017-10-17
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A kind of aluminum alloy for 480mpa grade aluminum alloy oil pipe and its pipe material manufacturing method
  • A kind of aluminum alloy for 480mpa grade aluminum alloy oil pipe and its pipe material manufacturing method
  • A kind of aluminum alloy for 480mpa grade aluminum alloy oil pipe and its pipe material manufacturing method

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Embodiment 1

[0036] The present invention is an aluminum alloy for 480MPa grade aluminum alloy oil pipe, its chemical composition includes: 6.90% of Zn, 1.75% of Mg, 0.18% of Cu, 0.28% of Mn, 0.20% of Cr, 0.02% of Ti, 0.18% of Zr, the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.13% of Fe and 0.15% of Si which account for 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 temper...

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

An aluminum alloy for a 480MPa grade aluminum alloy oil pipe according to the present invention comprises Zn: 5.50-6.90%, Mg: 1.75-1.80%, Cu: 0.05%, Mn: 0.10-0.30%, Cr: 0.10-0.30% in weight percentage , Ti: 0.01-0.02%, Zr: 0.15-0.18%, and the rest are Al and unavoidable impurities; among the unavoidable impurities, the content of Si is not more than 0.15% of the total weight of the aluminum alloy, and the content of Fe is not more than the total weight of the aluminum alloy 0.15%. A method for manufacturing an aluminum alloy pipe, comprising the following steps: 1) smelting and refining the above-mentioned raw materials to obtain a pipe billet; 2) three-stage homogenization treatment; 3) extruding at high temperature; 4 ) by two-stage solution treatment and quenching and cooling; 5) pre-stretching deformation; 6) by two-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 the pipe. Background technique [0002] With the development of the petroleum industry, the performance and cost requirements for corrosion-resistant alloy oil pipes are constantly increasing. Aluminum alloy tubing has the characteristics of high specific strength, good plastic toughness, excellent corrosion resistance and fatigue resistance, and its research has received extensive attention. [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...

Claims

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Application Information

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Patent Type & Authority Patents(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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