> Basically it's an air hardening steel "The critical temperature > for S-7 is > 1700 degrees to 1750 degrees F. I don't have a pyrometer- that's getting to a medium orange, though, isn't it? Not your 1095 'cherry red'... I'll play with it and figure out whether that's where it goes non-magnetic, or if that's way beyond NM. Thanks, andy G.