Process to produce 6xxx alloys by reducing altered density sites

Abstract From the Canadian patent

A process for improving 6XXX alloys, such as 6013 preferably includes , heating, hot rolling inter-rolling thermal treatment at a very high temperature such as 1020 ~F or more, again hot rolling (with or without subsequent continuous hot rolling or cold rolling or both) solution heat , treating and artificial aging. The initial heating inter-rolling, thermal , treatment and solution treatment especially the latter two, are carried out at very high temperatures such as 1030 ~F. Each aforesaid hot rolling stage produces substantial metal thickness reduction. The improved sheet or plate product has a substantially reduced occurrence of reduced density features revealed in scanning …