Gunmetal, also known as Red Brass in the United States, is a type of bronze - an alloy of copper, tin, and zinc. Proportions vary by source,but 88% copper, 8-10% tin, and 2-4% zinc is an approximation. Originally used chiefly for making guns, it was eventually superseded in this department by steel. Gunmetal, which casts and machines well and is resistant to corrosion from steam and salt water, is used to make steam and hydraulic castings, valves, gears, statues, and various small objects, such as buttons.
Specifications:
- Tensile Strength: 221 to 310 MPa
- Brinell Hardness: 65 to 74 Pascal