diffusion knife1)High quality,low price 2)Material 65 Mn 3)Usage kogoba,yanmar,John deer,foton,class,etcThe diffusion knife is 45-50 HRC,material is 65Mn(1566),Process:Forging,andthe diffusion knife is suitable for cut wecan also supply the diffusion knife,such as:plough share, plough wheel, plough chain and so on. welcome to our factory to visit and any sample or drawing is welcome .