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Which of the following alloy has high cavitation resistance that usually used for ship propellers and pumps impellers in seawater?

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Which of the following alloy has high cavitation resistance that usually used for ship propellers and pumps impellers in seawater?

(a) Titanium

(b) Stellite

(c) 17-7 Stainless steel

(d) Nickel aluminum bronze

The question was posed to me in semester exam.

Enquiry is from Environments in section Other Environments of Corrosion Engineering

1 Answer

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Right answer is (b) Stellite

Easy explanation: Stellite is a cobalt-chromium alloy with high cavitation resistance that usually used for ship propellers and pump impellers in seawater. Composition of Stellite is 27–32% chromium, 4–6% tungsten, 0.9–1.4% carbon, with additions of nickel, iron, silicon, manganese, and molybdenum and cobalt as balance.

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