The 150mm four-column 20-high rolling mill of AMC successfully put into production. It is the first set of hydraulic rolling mill independently developed and manufactured in China and the finished product is 0.003mm. The roll box of the equipment is an open four-column structure. The roll system is arranged in a tower shape according to 1-2-3-4. It is screwdown by hydraulic cylinder. The automatic AGC system is controlled by SIEMENS PLC, with constant gap, constant  force and  forword , backword function, tension AGC and other functions.