... . 4.ABB speed governor. 5.Stainless steel material. Pellet Making Machine details:1.Single or conical twin screw extruder can be ... .3.Screw material: high quality alloy steel 38CrMoAlA, treated by Nitrogen, Nitriding depth: 0.5~0.7mm,surface hardness: HV740 ~ 9404 ... .5.Barrel material: high quality alloy steel-38CrMoAlA, treated by Nitrogen, nitriding depth: 0.6~0.7mm, surface hardness≥ HV940.6 ...