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Aluminum alloy for chloride ion corrosion-resistant aluminum alloy oil pipe and method for manufacturing the same

An aluminum alloy, corrosion-type technology, which is applied in the field of aluminum alloy for chloride ion corrosion-resistant aluminum alloy tubing and its pipes, can solve the problems of difficulty in meeting corrosion performance requirements, harsh corrosion environment of production pipe strings, etc., and achieve excellent mechanical properties and corrosion resistance, increase the nucleation rate of intragranular strengthening precipitates, and improve the effect of strength performance

Active Publication Date: 2018-03-13
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

[0005] However, with the deepening of exploration and development of oil and gas resources, the corrosion environment of the production tubing string is getting worse, especially the aluminum alloy tubing needs to face higher Cl - Corrosive environment, the traditional aluminum alloy oil pipe materials are difficult to meet the strength requirements and the Cl resistance - Corrosion Performance Requirements

Method used

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  • Aluminum alloy for chloride ion corrosion-resistant aluminum alloy oil pipe and method for manufacturing the same
  • Aluminum alloy for chloride ion corrosion-resistant aluminum alloy oil pipe and method for manufacturing the same

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Embodiment 1

[0038]The present invention is an aluminum alloy for chloride ion corrosion-resistant aluminum alloy tubing, the chemical composition of which includes: 7.49% of Zn, 2.30% of Mg, 0.05% of Cu, 0.26% of Mn, 0.10% of Cr, 0.01% Ti, 0.2% Zr, 0.05% Sc, and the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.09% Fe and 0.06% Si which account for the total weight of the aluminum alloy.

[0039] The manufacturing method of the above-mentioned aluminum alloy tubing for chloride ion corrosion-resistant aluminum alloy tubing is as follows: the above-mentioned raw materials are smelted and refined outside the furnace, and then cast to obtain a hollow ingot, and the hollow ingot is heated in a heating furnace to 385°C and 465°C respectively. Two-stage homogenization treatment is carried out, and the corresponding holding time is 12h and 24h; the extrusion temperature of the hollow ingot is 425°C, the extrusion ratio is 18.3, and the extrus...

Embodiment 2

[0042] The present invention is an aluminum alloy for chloride ion corrosion-resistant aluminum alloy tubing, the chemical composition of which includes: 6.95% of Zn, 2.15% of Mg, 0.09% of Cu, 0.30% of Mn, 0.20% of Cr, 0.02% Ti, 0.15% Zr, 0.08% Sc, and the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.08% Fe and 0.06% Si accounting for the total weight of the aluminum alloy.

[0043] The above-mentioned aluminum alloy tubing for chloride ion corrosion-resistant aluminum alloy tubing is manufactured by smelting and refining the above-mentioned raw materials and then casting the hollow ingot, and heating the hollow ingot to 380°C and 465°C respectively in the heating furnace. Two-stage homogenization treatment is carried out, and the corresponding holding time is 12h and 24h; the extrusion temperature of the hollow ingot is 420°C, the extrusion ratio is 18.3, and the extrusion speed is 4mm / s; the two-stage solution treatment ...

Embodiment 3

[0046] The present invention is an aluminum alloy for chloride ion corrosion-resistant aluminum alloy tubing, the chemical composition of which includes: 6.9% of Zn, 2.10% of Mg, 0.10% of Cu, 0.10% of Mn, 0.30% of Cr, 0.02% Ti, 0.17% Zr, 0.10% Sc, and the remaining components are Al and unavoidable impurities, wherein the unavoidable impurities include 0.07% Fe and 0.08% Si accounting for the total weight of the aluminum alloy.

[0047] The manufacturing method of the above-mentioned aluminum alloy tubing for chloride ion corrosion-resistant aluminum alloy tubing is as follows: the above-mentioned raw materials are smelted and refined outside the furnace, and then cast to obtain a hollow ingot, and the hollow ingot is heated in a heating furnace to 380°C and 470°C respectively. Two-stage homogenization treatment is carried out, and the corresponding holding time is 12h and 24h; the extrusion temperature of the hollow ingot is 415°C, the extrusion ratio is 18.5, and the extrusio...

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Abstract

The invention discloses aluminum alloy for an anti-chloridion-corrosion type aluminum alloy oil pipe and a pipe manufacturing method of the aluminum alloy. The aluminum alloy comprises, by weight, 6.90%-7.49% of Zn, 2.10%-2.30% of Mg, 0.05%-0.10% 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, 0.05%-0.1% of Sc, and the balance Al and inevitable impurities. The strength performance of the aluminum alloy is improved significantly through matching of the high-content Zn and the low-content Mg. The strength and the repeated loading resistance of the aluminum alloy are improved through the appropriate-content Mn and the appropriate-content Cr, and the good plasticity and toughness of the aluminum alloy are ensured. The micro-content Ti, the micro-content Zr and the micro-content Sc serve as supplement and improvement. The structure stability and the performance reliability of the aluminum alloy are ensured through grain refinement and precipitation strengthening. The aluminum alloy for the anti-chloridion-corrosion type aluminum alloy oil pipe is high in overall specific strength, good in corrosion resistance, low in cost, good in processability and high in qualified product ratio.

Description

technical field [0001] The invention relates to the technical field of oil pipe manufacturing, in particular to an aluminum alloy for an aluminum alloy oil pipe resistant to chloride ion corrosion and a method for manufacturing the pipe. Background technique [0002] With the development of the petroleum industry, the demand for production strings with high specific strength, good plastic toughness, corrosion resistance and fatigue resistance is becoming more and more intense. Aluminum alloy oil pipe has the above characteristics and its excellent cost performance, its research has been widely valued by countries all over the world. [0003] At present, corrosion-resistant alloy oil pipes commonly used as oil and gas resource production strings, such as nickel-based alloy oil pipes, iron-nickel-based alloy oil pipes, duplex stainless steel oil pipes, and martensitic stainless steel oil pipes, etc., mostly use high alloys of precious metal elements such as Ni, Mo, and Cr. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053
CPCC22C21/10C22F1/002C22F1/053
Inventor 冯春
Owner BC P INC CHINA NAT PETROLEUM CORP
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