Power requirements for rolling high-carbon steel of small section

The tests in this paper were taken from a 9-in. merchant mill, a plan of which is shown in Fig. 1. The mill consists of seven stands of three-high rolls and one finishing stand of two-high rolls driven by a two-speed two-phase, 60-cycle, 2200-volt induction motor of squirrel-cage rotor construction, connected to the mill by means of a 42-in. three-ply belt. The ratings of the motor are 600 h. p. at 600 rev. per min. (synchronous speed) and 450 h. p. 450 rev. per min. The pulley reduction gives a mill-speed of one-half these values.