Title: Process for producing aluminium alloy sheet
Application Number: 98808977 Application Date: 1998.09.10
Publication Number: 1269844 Publication Date: 2000.10.11
Approval Pub. Date: 2002.01.23 Granted Pub. Date: 2002.01.23
International Classifi-cation: C22F1/047
Applicant(s) Name: Nippon Light Metal Company Ltd. Address:
Inventor(s) Name: Moriyama Takashi;P. Wycliffe;D. J. Lloyd
Attorney & Agent: duan chengen
Abstract:
    A continuously cast and rolled sheet of an aluminum alloy having Mg in a content of 3 to 6 % by weight is annealed, followed by strain correction, heat and hold treatment at a given temperature between 240 DEG C and 340 DEG C for one hour or more, and slowly cooling treatment, to thereby provide an aluminum alloy sheet having enhanced resistance to stress corrosion cracking and improved shape fixability. The slowly cooling treatment is carried out at a cooling rate chosen from a preset cooling zone corresponding to a preset temperature zone S defined in obliquely lined surrounded form in the accompanying drawing.
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