... 3)Usage kogoba,yanmar,John deer,foton,class,etc diffusion knife1)High quality,low price2)Material 65 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, ...