... 500,000ton wire,bar,rod material in continious, semicontinous roll production line.(2)2hi,4hi of cold and hot boards rolling ... in the unit apparatus of steel rolling: (1)100,000-600,000ton wire,bar,rod material in continious, semicontinous roll production line. ( ... in the unit apparatus of steel rolling: (1)100,000-600,000ton wire,bar,rod material in continious, semicontinous roll production line. ( ...