YSS (Yasuki Special Steel) Material Data Sheet for Ikkanshi Tadatsuna Kitchen Knives
      C Si Mn P S Cr W Mo
Honyaki Type A A YSSW-1 A1.30 ~ 1.40 0.10 ~ 0.20 0.20 ~ 0.30 ~ 0.025 ~ 0.004 - - -
(Awataguchi)   Shiro-Gami 1gou B1.20 ~ 1.30              
                     
Honyaki Type B/White Steel BE YSSW-2 A1.10 ~ 1.20 0.10 ~ 0.20 0.20 ~ 0.30 ~ 0.025 ~ 0.004 - - -
(Ikkanshi)   Shiro-Gami 2gou B1.00 ~ 1.10              
                     
Honyaki Type F F YSSW-3 0.80 ~ 0.90 0.10 ~ 0.20 0.20 ~ 0.30 ~ 0.025 ~ 0.004 - - -
(Tadatuna)   Shiro-Gami 3gou                
                     
Damascus/Blue Steel CD YSSB-2 A1.10 ~ 1.20 0.10 ~ 0.20 0.20 ~ 0.30 ~ 0.025 ~ 0.004 0.20 ~ 0.50 1.00 ~ 1.50 -
    Ao-Gami 2gou B1.00 ~ 1.10              
                     
European G YSSG-3 0.95 ~ 1.10  ~ 0.35 0.60 ~ 1.00 ~ 0.030 ~ 0.020 13.00 ~ 14.50 - -
(INOX)                    
                     
NOTE:
We have a very strict regulation of the use of P and S, which are harmful
to the sharpness of knives, by using Hitachi's own high quality raw material. 
A1 and B1 refer White Steel 1 and 2, Blue Steel 1 and 2. A is for a harder blade. B is for a softer blade.
HRC 63~64