... plastic material:PP,PEetc. 2.Material:SACM-645,SCM440,38CrMoALA 3.high quality plastic extrusion screw and barrel Size:screw diameter ø15 ... hardness after nitrogenation≥900HV8.Depth of double alloys:0.8-2.0mm Used for granulation ,PP,PE,PA,PC,ABS,AS etcWe ...