FIELD: engines and pumps.
SUBSTANCE: set of invention relates to machine building and can be used in downhole electrically driven rotary pumps for oil extraction. Impeller and guide vane of this pump are moulded from cast iron of the following composition, wt %: carbon - 3.2-3.9; silicon - 0.2-1.0; manganese - 0.5-0.8; chromium - 0.1-0.5; copper - 0.8-1.5; aluminium - 1.7-4.0; titanium - 0.0-0.2; phosphorus - not over 0.2; sulphur - not over 0.02, iron making the rest. Surfaces of impeller and guide vane have low-temperature nitrated 50-300 mcm-deep ply.
EFFECT: higher reliability, lower costs, increased MTBR.
3 cl, 1 dwg, 1 tbl
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