Aluminum Alloy 7178 is a very strong aluminum alloy, deriving that strength from considerable inclusions of zinc, magnesium, copper, and chromium — about 11% to 12% of the alloy’s elemental composition. Its excellent strength and light weight make it ideal for a number of industries that frequently involve high-stress environments, including the aerospace, military and defense, construction, and marine industries. Continental Steel & Tube Company offers Aluminum Alloy 7178 in coil, shape, and angle form, as well as in extruded Tee bar form in a range of dimensions.