Blue Steel No.2 (Hitachi Metals Ltd.) is made by adding Chromium and Tungsten / Wolfram to White Steel No.2. This results in increased toughness and the production of hard carbide molecules which improve edge retention. Many knife users have noted that while Blue Steel No.2 is very similar to White Steel No.2 in terms of edge sharpness, it has slightly superior edge retention.

C 1.05- 1.15 % | Cr 0.2-0.5 % | W 1.0-1.5 %