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The article presents results of the studies conducted by the authors for determining the influence of the structure succession on the volume fraction of martensite and ferrite microhardness in a dual-phase steel with low manganese content. For the research in discussion, an alloy with 0.094% C and 0.53% Mn (Si, Cr, Ni, Mo, Al, Cu, P, and S below 0.1%) was used. This alloy was subjected to several cycles of heat treatments (consisting of full annealing, normalizing, subcritical annealing, full quenching, intercriti...