diffusion knife 1)High quality,low price 2)Material 65 Mn 3) ... Mn3)Usage kogoba,yanmar,John deer,foton,class,etcThe diffusion knife is 45-50 HRC,material is 65Mn(1566),Process:Forging ... ,and the diffusion knife is suitable for cutwe can also supply the diffusion knife,such as:plough share, plough wheel ...