SJZS 65/132 plastic extruder conical double screw barrel 1.Materials:38CrMoAIA,42CrMo, ... Discount Available Application PVC PE PP… Payment Term T/T , L/C Heat-TreatmentNitridedor BimetallicHardness:>950HVDelivery Term30 working days Packing Wrapped ... Common Nitrided:2-3 yearsBimetallic: much longer lifetime. SJZS 65/132 plastic extruder conical double screw barrel