Brazeable aluminum alloy sheet and process of making same

US5021106A · kind A · utility

Assignee

• Showa Aluminum Corp. · JP

Inventors

• Ichiro Iwai · Yokohama, JP
• Hiroyuki Eda · Moriya, JP

Key dates

• Filing date: Oct 19, 1989
• Grant date: Jun 4, 1991
• Expiry date: Oct 19, 2009

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C21/00
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A brazeable aluminum alloy sheet consisting essentially of 0.8 to 1.3 wt % of Mn, 0.2 to 0.7 wt % of Si, one or two of 0.04 to 0.1 wt % of In and 0.1 to 2.0 wt % of Zn, the balance being aluminum and unavoidable impurities. The brazeable aluminum alloy sheet is produced by a process which comprises preparing an ingot of aluminum alloy containing 0.8 to 1.3 wt % of Mn and 0.2 to 0.7 wt % of Si, the balance being aluminum and unavoidable impurities, hot rolling the aluminum mass at a temperature of 350.degree. to 450.degree. C. without conducting a homogenizing treatment, conducting a first part of cold rolling on the hot rolled aluminum alloy, conducting a process annealing on the aluminum alloy at a temperature of 350.degree. to 420.degree. C., and conducting a second part of cold rolling on the annealed aluminum alloy at a draft percentage of 20 to 40%.