Strength of steels in hot strip mill rolling

AbstractThe hot strength of a number of steels has been measured using a torsion machine programmed to simulate the conditions at the first four stands of a hot strip mill. The rolling forces were calculated from the measured torque-revolution curves and it is shown that laboratory data are in close agreement with loads measured at the first stand of the hot strip mill. The results indicate that small amounts of either Nb and for Ti retard the rate of recrystallization to such an extent that recrystallization may not occur between stands at temperatures below 1000°C. Tests on stainless steels indicated that even higher temperatures are required for interstand recrystallization.