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In this article, nano-oxide dispersion-strengthened (ODS) 21Cr-9Mn-6Ni steels were prepared from elemental powders through vacuum hot pressing. Three ODS steels (21Cr-9Mn-6Ni-0.4Ti-0.3Y2O3, 21Cr-9Mn-6Ni-0.4Ti-0.3ZrO2 and 21Cr-9Mn-6Ni-0.4Ti-0.15Y2O3-0.15ZrO2) were prepared to study the effect of Y2O3 and ZrO2 additions on the microstructure and mechanical properties. The nano-oxide precipitates within the austenite matrix were identified using a transmission-electron microscope equipped with energy-dispersive X-ray spectrometer (TEM-EDX). An addition of Y2O3 with ZrO2 leads to the formation of a bimodal distribution of grains and fine oxide particles of Y-Zr-O and Y-Ti-O in the microstructure of an ODS steel. The results of the tensile test at different temperatures reveal that the strength and elongation of 21Cr-9Mn-6Ni steels are improved with the addition of Y2O3 and ZrO2 due to a stronger interface bonding between large numbers of oxide particles and the austenite matrix.V~lanku avtorji opisujejo izdelavo z nano-oksidnimi delci disperzijsko utrjenega (ODS) jekla 21Cr-9Mn-6Ni. ODS jeklo je bilo izdelano z vro~im stiskanjem iz elementarnih prahov. Tri ODS jekla (21Cr-9Mn-6Ni-0,4Ti-0,3Y2O3, 21Cr-9Mn-6Ni-0,4Ti-0,3ZrO2 in 21Cr-9Mn-6Ni-0,4Ti-0,15Y2O3-0,15ZrO2) so izdelali z namenom, da bi raziskali vpliv dodatkov Y2O3 in ZrO2 na mikrostrukturo in mehanske lastnosti. Nano-oksidne izlo~ke v austenitu so okarakterizirali s presevnim elektronskim mikroskopom, opremljenim z rentgenskim energijskim disperzijskim spektrometrom (TEM-EDX). Ugotovili so, da dodatek Y2O3 s ZrO2 vodi do tvorbe bimodalne porazdelitve kristalnih zrn in drobnih oksidnih delcev Y-Zr-O in Y-Ti-O v mikrostrukturi ODS jekla. Natezni preizkusi pri razli~nih temperaturah so pokazali, da sta se trdnost in raztezek 21Cr-9Mn-6Ni jekla izbolj{ala z dodatkom Y2O3 in ZrO2 zaradi mo~nej{e vezi med velikim {tevilom oksidnih delcev in austenitno matrico.

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