CW724R | CuZn21Si3P | C69300 | Cuphin

Alternative brass alloy for drinking water installations, as the alloy is considered resistant to stress corrosion cracking and dezincification, but without lead, arsenic and nickel.

Composition here according to OES: 19% Zn, 3% Si, 0.06% P, remnant Cu. Multiphase alloy that can contain up to four phases depending on heat treatment. Here, only α (fcc, brown) and κ (hcp, light) are present, probably annealed at about 600 °C. The α phase is more prone to twinning and contains slightly less Si and more Zn than the κ phase. Its more etched grains appear coarse in SEM.