![]() Nickel silver provides good mechanical properties and excellent resistance to corrosion and tarnish. Fittings such as couplings, tees, ells, pump bodies, and valve bodies are cast from this alloy. Typical uses are for worm gears, bearing sleeves, pinions, and propeller blades.Ĭupro-nickel has an excellent resistance to salt water corrosion. Higher strength and hardness can be obtained in some of the alloys by proper heat treatment. Strength, hardness, ductility, and corrosion resistance for the properties which makeĪluminum bronze a desirable alloy for shipboard use. Naval brass is a yellow brass which has a higher corrosion resistance than commercial yellow brass. It is a general-purpose alloy used for fittings, name plates, and similar applications. These disadvantages, however, can be overcome by proper design and casting procedures.Ĭastings which are not subjected to air or water pressure but which require corrosion resistance are made from yellow brass. It has the disadvantage of having a high solidification shrinkage and a comparatively high drossing tendency. Manganese bronze has an excellent combination of corrosion resistance, strength, and ductility that makes it very useful for the various marine castings. Typical uses are in propeller hubs, propeller blades, engine framing, gun-mount castings, marine-engine pumps, valves, gears, and worm wheels. Manganese bronze castings are strong, ductile, and are corrosion resistant to sea water, sea air, waste water, industrial wastes, and other corroding agents. Castings subjected to hydraulic pressures up to 350 pounds can be made from this alloy. It is a general-purpose alloy having good corrosion resistance. This alloy, the familiar 85-5-5-5 alloy, is a leaded red brass, also known as ounce metal. It can be used in place of Composition G if its lower strength is adequate. It is often used in valves and steam fittings.Ĭomposition M, or valve bronze, is a tin bronze to which lead has been added to improve the machinability. These properties make it a useful alloy for castings required aboard ship. Composition G, or gunmetal, is a tin bronze which has good resistance to salt-water corrosion and to dezincification.
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