A myth in the knife world is that out there somewhere there is a super-steel with high performance cutting ability that doesn't rust. A steel foundry in Japan made the myth a reality by intoducing H-1 steel. H1 steel is a PH steel meaning it is a precipitation-hardened steel. It's naturally hard without heat-treating and with 1% nitrogen instead of carbon it cannot rust. H1 holds a sharpened cutting edge equivalent to many premium carbon steels but without developing rust or pitting. New steels have been introduced in this line giving the same rust resistance while adding significant edge retention characteristics.