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This paper presents experimental results that indicate the possibility of selecting the crystalline phase obtained by nitriding pulsed plasma, allowing the choice among the ε-Fe2-3N and γ'-Fe4N single-phase layers formed under the sample surface, in the white layer. AISI 1015 low carbon steel samples were treated with pressures between 100 Pa and 1400 Pa at 500°C. Short bipolar pulses of voltage were applied at 125kHz to perform the plasma nitriding. The XRD and SEM results show that the increase in the pressure favors the selection of γ'-Fe4N. [ABSTRACT FROM AUTHOR]