... test various steel rolling. I. Specification of the steel rolling machine( new, second) dia 650mm, 500mm, 450mm rough rolling mill group ... group. ( Note: all the groups include motor, Reducer, Coupler, guide rail, roller etc. ) II. Rolling steel products I-bar, angle bar ... , U-bar, round bar, deformed steel bar, rail steel, steel for agricultural-purpose etc. III. Types of service ...