Abstract
The hot ductility of three as-cast low carbon steels with similar volume fractions of inclusions, but with Mn/S ratios varying from 2.9 to 4.4, has been studied by hot torsion testing in an inert atmosphere at temperatures from 900° to 1250°C. Ductility, measured as equivalent surface strain to fracture, showed scatter for repeat tests of up to ±20%. Within this scatter, there was little effect of strain rate, but ductility increased systematically with increasing temperature. The steels also showed consistently better ductility with higher Mn/S ratio. The ductility of the steel with the lowest Mn/S ratio was also found to be sensitive to the heating time before torsion testing whereas the steels of higher Mn/S ratio were not. All the steels showed improved ductility after an initial industrial heat treatment of the ingot, consisting of heating the ingot in a pusher furnace, set at 1100°C, and cooling to room temperature before reheating for torsion testing.
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