... a box,Reduced footprint,Centralized Lubrication Diameter 400 Mill Compound Gear Box, hot rolling mill Steel rolling machine, a part of rolled ... steel production line, from scrap to melting to casting to mill rolling to steel ( need not heating furnace), Type:Diameter 250 ... ~550, supporting the use of the mill models. Speed:Diameter 250~350, line speed is 5~12m ...