... hardness is HRC58~60.5)Charging barrels: 11barrels in all, barrel length:150mm per section, which is made of #45 steel ... , water-cooling for barrels. The first barrel is for feeding; the fifth barrel is open side barrel, the side feeder have blind block ... ,fifth and seventh is liquid charging barrel ,and with liquid charging pin valve, the ten barrel is for vacuum degasification, and the ...