1. Pump materials must be selected according to the data on their corrosion-cavitation resistance as well as their corrosion resistance. 2. Steel Kh34L has good resistance to cavitation of low and medium intensity. 3. Alloys with high corrosion-cavitation resistance can be subjected to corrosion-cavitation tests at a C−C ratio of 12; higher C−C ratios (24 or 36) sharply increase the costs and the time needed for such tests. 4. The cavitation resistance of steel Kh34L in relation to the temperature of the liquid medium is characterized by weight loss curves with two peaks — at 20 and 50°C. Curves of the same character were found only in the case of steel Kh18N12M3TL. The curves for the other alloys had only one peak. 5. Steel Kh34L has a high corrosion-cavitation resistance in water and in an aqueous solution of nitric acid and a low resistance in an aqueous solution of sulfuric acid. 6. Steel Kh34L can be recommended for pump parts exposed to water and chemicals for which bronze Br. AZh 9-4L and cast iron SCh 18-36 are used at present.