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A Study on the Development of Hot Rolling Process for 18Cr-10Mn-0.44N 2

Abstract The objective of this paper is to determine the effect of process parameters on the behavior of a 18Cr-10Mn-0.44N 2 nitrogen steel sample deformed by hot rolling. Compression tests were carried out at high temperatures to determine the flow stresses needed for a finite element(FE) analysis. The strain rate, ranging from 0.1 to 1.0s -1 , significantly affected the flow stress at temperatures higher than 1,000 o C. Non-isothermal rolling simulations and laboratory rolling tests were performed with plate specimens 14.5mm thick, 135mm wide and 226mm long. A rolling reduction of 15% per pass leading to a cumulative rolling reduction of 60% was determined as optimal. The extension ratio of 176.5% in the length direction was about 30.4 times greater than the extension ratio of 5.8% in the width direction. Isotropic properties for tensile strength, microstructure and grain size were measured after mock-up hot rolling tests. The results from the mock-up tests were found to be in good agreement with those of the simulations.