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, 2.4·10−3, 0.2, 6.5 s−1. The work hardening at room temperature was near-linear typical of this steel. It was found that the work hardening rate and the torsional ductility are strongly influenced by temperatures T ≥ 150°C. Sub-surface deformed specimens at T = 450°C and 2.4·10−3 s−1 were analysed via high-resolution electron backscatter diffraction system, showed a sub-structure of very fine grains indicating that continuous dynamic recrystallization had taken place.