QCr0.5-0.2-0.1 QCr0.6-0.4-0.05
铬锆铜C18150 C181..
QCr0.5-0.2-0.1..
铬铜 QCr1 QCr0.5..
C86300 C99750 ..
锰青铜 QMn1.5 QMn..
C87400 C87900 ..