Process for producing alsimgcu alloy products with improved resistance to intercrystalline corrosion
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United States of America Patent
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Jan 12, 1999
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N/A
app pub date -
Apr 4, 1997
filing date -
Oct 25, 1994
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Abstract
The invention concerns a process for the production of rolled or extruded products of high strength AlSiMgCu aluminium alloy with good intergranular corrosion resistance, comprising the following steps: casting a plate or billet with the following composition (by weight): Si: 0.7-1.3% Mg: 0.6-1.1% Cu: 0.5-1.1% Mn: 0.3-0.8% Zr: <0.20% Fe: <0.30% Zn: <1% Ag: <1% Cr: <0.25% other elements: <0.05% each and <0.15% in total remainder: aluminium; with: Mg/Si<1 homogenising in the range 470.degree. C. to 570.degree. C.; hot working, and optionally cold working; solution heat treating in the range 540.degree. C. to 570.degree. C.; quenching; annealing, comprising at least one temperature plateau in the range 150.degree. C. to 250.degree. C., preferably in the range 165.degree. C. to 220.degree. C., the total period measured as the equivalent time at 175.degree. C. being in the range 30 h to 300 h.
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