Gunmetal facts for kids
Proportions of its metals vary. 88% copper, 8-10% tin and 2-4% zinc is usual.
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.
Gunmetal Facts for Kids. Kiddle Encyclopedia.