SLD steel by Hitachi is an excellent steel for kitchen knives. The main features of the steel is hard, tough and strong against wearing. Hitachi has improved it for better work and longer life, and named it SLD. The main chemical compositions of it is : C 1.4-1.6%, Cr 11.0-13.0%, Mo 0.8-1.2% & V 0.2-0.50%. Generally the steels which contain Cr 13.0% or more are called stainless steel. SLD has close to 13.% Cr and are fairly resistant for rust. Due to high carbon like 1.5%, the HRC after heat-treating reaches about HRC 61-62.