alloy of copper, tin, and zinc

Gunmetal, or red brass in the United States, is a metal alloy. It is a type of bronze – an alloy of copper, tin and zinc.

Gunmetal parts

Proportions of its metals vary. 88% copper, 8-10% tin and 2-4% zinc is usual.[1]

Originally it was used for making cannons. Guns are now made of steel. Gunmetal is easy to cast and work on a lathe. It resists corrosion from steam and salt water. It is used to make steam and hydraulic castings, valves, gears, statues, and various small objects such as buttons.


  1. "Gunmetal". Archived from the original on 2012-03-20. Retrieved 2008-04-09.