SHJ-36B Water-ring pelletizing line Twin-screw extruder Plastic ... tool steel, W6Mo5Cr4V2, which receives heat treatment with vacuum hardening at high temperature. The whole hardness is ... of #45 steel and lined with alloy bush, water-cooling for barrels. The first barrel is for ... and seventh is liquid charging barrel ,and with liquid charging pin valve, the ten barrel is for vacuum degasification, and ...