... , rollers,etc4 Manufactures blades with maximum length of 5500mm and maximum diameter of 1500mm, The products5 Materials5CrW2Si, 6CrW2Si, ... Cr12MoV, 9CrSi, H13, H13K HMB and MHK and self-developed HMB and HMK high alloy series which have been rewarded ... of steel, rubber, papermaking, and so on. 9 Each technical index reaches the international standard. Circular Blade Upper And Bottom Knives