[en] This article represents the ten-year study outcomes of the effect of powerful pulse electronic fluxes of accelerators, with the electron energy of 200-600 keV, and the pulse duration of 40-100 nsec and power density of 5·10⁷- 5·10¹⁰ W/cm², on stainless steel and alloys of X18H10, X20H45 type, that are widely used in the reactor engineering, and on a number of carbon steels and armco-iron. Irradiated, non-irradiated and flat specimen of 0.3 mm in thickness underwent a uniaxial deforming, with a speed of 0.5 mm/min, at all-in-one, testing machine ^lnstron-1195^. Structure and phase changes were studied with a help of X-ray electron microscope (XEM) of JEM100CX type and F-1053 magnetization sensor (locality is I mm²; sensitivity is 0.05%). Outcomes of mechanical properties study of austenitic steel 12X18H10T, subjected to pulse and electron fluxes, showed that the radiation effect on the yield point of steel becomes perceptible when the power density of electron beam is 5·10⁷ W/cm². Then, it constantly increases with an increase of q and, when the power density is 4.5·10⁹ W/cm², the strengthening effect is about 160%, which is twice as much as the radiation strengthening effect under neutron radiation, the fluence of which is of 1·10¹⁹ n/cm². Moreover, the ductility turned out to be less than that of at the reactor radiation, and was about 2%. It was established that the specimen were broken down under the beam, when q was more than 2.7·10¹⁰ W/cm². Steel specimen (12X18H10T) irradiated by the electron beam, when q was within 3.6·10⁸ - 6.0·10⁸ W/cm², possessed the best technological properties when the strengthening had reached 100%, with insignificant decrease of the ductility compared with the initial one. Comparison of the mechanical properties of austenitic steel 12X18H10T with high-nickel alloy 03X20H45M4BRC showed that radiation of specimen resulted in an increase of the yield points of steel 1.3 and 1.5 as much accordingly. In addition, the alloy ductility remained invariable, whereas the ductility of austenitic steel decreased at 20%. Such significant difference is apparently caused by martensite transformation effecting on ductility of instable austenitic steel 12X18H10T, whereas the high-nickel steel is not subjected to the martensite transformation. We established non-monotonous dependence of the martensite transformation kinetics in the steel on q. During structural investigations and using the XEM, there was a detection of well-formed, dislocation and cellular structure that had caused an increase of the yield point. The lath martensite effecting on the ductility of the irradiated specimen of steel 12X18H10T was detected as well. Investigation of pulse radiation fluxes effect on armco-iron and low-carbon steel 08KP showed that the yield point and the ultimate strength of the metals monotonously increased when the power density increased as well, but the ductility decreased. Intensive fluxes effect on the hardened steel, that was cold- rolled and had its ultimate strength of 90 kg/mm², discovered its insignificant loss of the strength and an increase of the ductility. The mechanism, causing the mechanical properties change of steels and alloys subjected to pulse radiation fluxes