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Gunmetal, also known as red brass in the United States, is a type of bronze – an alloy of copper, tin, and zinc. Proportions vary, but 88% copper, 8–10% tin, and 2–4% zinc is an approximation. Gunmetal, variety of bronze, formerly used for ordnance.
Understanding the Context
Modern admiralty gunmetal is composed of 88 percent copper, 10 percent tin, and 2 percent zinc and is used for gears and bearings that are to be subjected to heavy loads and low speeds. Gunmetal, occasionally called ‘red brass’ in the US, is an alloy made from copper, zinc, and tin [1, 2]. Aside from its basic constituents, modified forms may have nickel and lead, which are classified as ‘nickel gunmetal’ and ‘leaded gunmetal’ [2]. Explore the history and uses of gunmetal, a versatile alloy with excellent casting characteristics and corrosion resistance.
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Key Insights
Learn about its applications in various engineering fields, including the production of pump casings, valve guides, and bearings. The meaning of GUNMETAL is a metal used for guns; specifically : a bronze formerly much used as a material for cannon. Bronze is an alloy primarily of copper and tin, known for its durability and workability, whereas gunmetal, a type of bronze, includes zinc and has higher mechanical properties. Modified forms may contain lead (up to 7%) giving leaded gunmetal or nickel (up to 6%) giving a nickel gunmetal. Gunmetals are the most widely used copper casting alloys combining good corrosion resistance with modest strength and good castability.
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Gunmetal alloys are used to make steam and hydraulic castings, valves, pump parts, steam fittings, gears, bearings, statues, and small objects such as buttons. Modern admiralty gunmetal is composed of 88% copper, 10% tin, and 2% zinc.