A 60/40 brass with good castability and hot working properties.
An alloy of copper and zinc that contains 60 percent of copper, can be rolled hot, and is used for sheathing and bolts.
Alpha-beta brass, 60% copper and 40% zinc. Stronger than alpha-brass and used for castings and hot-worked (rolled, stamped, or extruded) products. High strength brasses are developed from this by adding other elements.
Muntz metal is a form of alpha-beta brass with about 40% zinc and 60% copper. It was discovered by George Fredrick Muntz, who ran a metal foundry in Birmingham in the United Kingdom. It was patented in 1832.