This paper is concerned with monotonic and load reversal deformation of four dual-phase (DP) 590, 780, 980, 1180 one martensitic (MS) 1700 steel sheets. While the data are presented for all steels, provided DP 1180. Particularities pertaining to including decreasing hardening rate during forward tension, a linear then non-linear unloading, followed by Bauschinger effect, shift in continuous str...