diffusion knife 1)High quality,low price 2)Material 65 Mn 3)Usage kogoba,yanmar,John deer, ... 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, plough chain ... visit and any sample or drawing is welcome . good quality low price diffusion knife