I learn something new most days. I'm pretty certain That I've never intentionally used a zinc alloy for anything requiring more strength than a sacrificial anode. I'm used to AL alloys having a 4 digit nomenclature, with the alloys of interest to me starting with a 5 or a 7. The Kryptonite alloy might be useful in Boolits in the event that Superman's ner' do well brother in law ever makes it to earth.
BD