Determination of Recrystallization Stop Temperature from Rolling Mill Logs and Comparison with Laboratory Simulation Results.

Abstract

Thetemperature of no-recrystallization, T~,, was measuredby means of laboratory torsion tests for three low carbon steels. The T~, values for these steels were also established from rolling mill log data obtained from the Algoma plate mill; these were found to be virtually identical to those from torsion tests. The mill log calculations were carried out by organizing the Sims roll force equations into a spreadsheet software for desktop personal computers. The results of both the torsion testing and mill log calculations compare well with previously developed correlations between T., and the chemical composition, and between A,3 and the composition, It was also found that the overall levels of the mean flow stresses calculated from the mill Iogs are close to those determined from torsion testing. This exce]lent agreement confirms that laboratory torsion testing can provide a convenient and very effective simulation of industrial hot rolling operations.