Extruder Screw Barrel Extruder screw barrel Diameter:15-360MM L/D=15-45 Screw structure and compression ratio can be designed according to different products and raw material. Material 1) 38CrMoALA (JIS SACM645) 2) Cr12MOV (JIS SKD-11) 3) 4Cr5MoSiV1(JIS SKD-61) 4) 42CrMo(AISI