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Small discs of type HR- 1 austenitic steel (OCr17Ni14MnMo) have been irradiated with 30-170 keV He+ for doses 1015- 1×1018/cm2 at 300K. 2.5 MeV enhanced proton backscattering, TEM, SEM and CEMS are used to investigate the He trapping, bubble structur