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
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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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