Submarine turbine casings utilize a percentage of which material to resist erosion?

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Erosion resistance in submarine turbine casings comes from using a material that stays hard and resists wear when exposed to abrasive particles and flow. Chrome stainless steel has chromium added in a sufficient amount to form a hard, protective oxide film and to give the metal good hardness and toughness. That combination helps prevent material loss from erosion while also offering solid corrosion resistance, which is why it’s favored for this application. Other materials don’t fit as well: nickel alloys provide high-temperature strength but aren’t as wear- and erosion-resistant in this context, molybdenum steel is strong but not as corrosion-resistant for the environment, and aluminum is too soft and lacks the needed hardness and high-temperature performance.